Inertia Dynamometer Brake Squeal Noise Test Procedure For Vehicles Without Regenerative Systems

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Inertia Dynamometer Brake Squeal Noise Test Procedure for Vehicles Without Regenerative Systems

Author : Brake NVH Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Inertia Dynamometer Brake Squeal Noise Test Procedure for Vehicles Without Regenerative Systems by : Brake NVH Standards Committee

Download or read book Inertia Dynamometer Brake Squeal Noise Test Procedure for Vehicles Without Regenerative Systems written by Brake NVH Standards Committee and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SAE J2521 procedure applies to high-frequency squeal noise occurrences for on-road passenger cars and light trucks below 4540 kg of GVWR. The procedure incorporates high-temperature and low-temperature test matrixes but does not fully account for the effects of the environment on brake squeal.For this test procedure, squeal occurs when the peak noise level is at least 70 dB(A) between 1.25 kHz and 16 kHz for tests using full suspension corners or full axle assemblies or between 2 kHz and 16 kHz for brakes not using a full suspension corner.Before using this recommended practice for chassis dynamometer testing, review in detail the specifics related to at least (a) instrumentation, including in-cabin microphones, (b) threshold levels for noise detection, (c) temperature control priority between the front and rear axles, (d) vehicle loading and load distribution, (e) cooling air and environmental conditioning, and (f) detailed nomenclature and labeling of channels and sensors. The current revision of this SAE Recommended Practice includes updates and extensions to (a) reflect the taxonomy and guidelines from the SAE J3152 Information Report for fixture design, fabrication, and installation; (b) expand individual sections with low temperatures and speeds; (c) expand the sections for friction characteristic to include 30 km/h events at colder temperatures (-5 °C and 40 °C), at 10 bar of brake pressure; (d) increase the maximum fade temperature for rear disc brakes to 300 °C and 400 °C, for the standard and optional schedules, respectively; and (e) include metrics to report the coefficient of friction per the VDA 300.

Brake Dynamometer Squeal Noise Test Procedure for Commercial Vehicles with Air Brakes

Author : Truck and Bus Foundation Brake Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)

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Book Synopsis Brake Dynamometer Squeal Noise Test Procedure for Commercial Vehicles with Air Brakes by : Truck and Bus Foundation Brake Committee

Download or read book Brake Dynamometer Squeal Noise Test Procedure for Commercial Vehicles with Air Brakes written by Truck and Bus Foundation Brake Committee and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This SAE Recommended Practice applies to commercial vehicles above 4540 kg of gross vehicle weight rating equipped with air brakes used under normal operating conditions. The procedure incorporates high and low-temperature test matrices, but does not fully account for the effects of the environment on brake squeal. Much research is currently underway in this area. This document defines brake squeal as a peak noise level of at least 80 dB(A) between 500 Hz and 17 kHz for air disc and drum brakes on on-road vehicles. Commercial vehicle (CV) manufacturers and their suppliers need a standard laboratory method to assess the propensity of the foundation brakes to generate squeal noise. The early engineering assessment for noise provides a baseline during the vehicle or brake system development process. This document allows multiple parties to speak to the same parameters when reviewing squeal noise testing and before vehicle evaluations. A systematic squeal noise test procedure supports the entire supply chain for the lifetime of the braking system.

FMVSS Inertia Dynamometer Test Procedure for Vehicles Below 4540 Kg GVWR

Author : Brake Dynamometer Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis FMVSS Inertia Dynamometer Test Procedure for Vehicles Below 4540 Kg GVWR by : Brake Dynamometer Standards Committee

Download or read book FMVSS Inertia Dynamometer Test Procedure for Vehicles Below 4540 Kg GVWR written by Brake Dynamometer Standards Committee and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document derives from the Federal Motor Vehicle Safety Standards 105 and 135 vehicle test protocols as single-ended inertia-dynamometer test procedures. The test sequences enable brake output measurement, friction material effectiveness, and corner performance in a controlled and repeatable environment. This SAE Recommended Practice (RP) also includes optional sections for parking brake output performance for rear brakes. It applies to brake corners from vehicles covered by the FMVSS 105 and 135 when using the appropriate brake hardware and test parameters. The FMVSS 135 applies to all passenger cars and light trucks up to 3500 kg of GVWR. The FMVSS 105 applies to all passenger cars, multi-purpose vehicles, buses, and trucks above 3500 kg of GVWR. This document does not include testing for school bus applications or vehicles equipped with hydraulic brakes with a GVWR above 4540 kg. This revised document takes into consideration new technologies for braking systems like (a) vacuum assist, (b) electric parking brake (EPB), and (c) regenerative braking. The inertia calculation references the latest version of the SAE J2789 to calculate the test inertia, including two methods to reflect the brake blending for the regenerative system. This revision also addresses formatting and grammatical corrections and clarifies items about FMVSS 105, FMVSS 135, or both. Other aspects of the rationale from previous revisions of this SAE Recommended Practice (RP) are still applicable.

FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4 540 Kg GVWR

Author : Truck and Bus Hydraulic Brake Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4 540 Kg GVWR by : Truck and Bus Hydraulic Brake Committee

Download or read book FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4 540 Kg GVWR written by Truck and Bus Hydraulic Brake Committee and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Recommended Practice is derived from the FMVSS 105 vehicle test and applies to two-axle multipurpose passenger vehicles, trucks and buses with a GVWR above 4 540 kg (10 000 lbs) equipped with hydraulic service brakes. There are two main test sequences: Development Test Sequence for generic test conditions when not all information is available or when an assessment of brake output at different inputs are required, and FMVSS Test Sequence when vehicle parameters for brake pressure as a function of brake pedal input force and vehicle-specific loading and brake distribution are available. The test sequences are derived from the Federal Motor Vehicle Safety Standard 105 (and 121 for optional sections) as single-ended inertia-dynamometer test procedures when using the appropriate brake hardware and test parameters. This recommended practice provides Original Equipment Manufacturers (OEMs), brake and component manufacturers, as well as aftermarket suppliers, results related to brake output, friction material effectiveness, and corner performance in a laboratory-controlled test environment.The test sequences include different dynamic conditions (braking speeds, temperature, and braking history as outlined in the FMVSS 105); inertia loads equivalent to the vehicle's LLVW and GVWR; fully operational, partial failure, and failed system conditions. All applicable sections of the FMVSS 105 are included. Optional sections include: parking brake output, water recovery, TP-121D dynamometer retardation, and 32 km/h (20 mph) stops to simulate Federal Motor Carrier Safety (FMCS) requirements.This Recommended Practice does not evaluate or quantify other brake system characteristics such as wear, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice. Consistency and margin of pass/fail of the minimum requirements related to stopping distance or equivalent deceleration levels of the FMVSS 105 vehicle test can be assessed as part of the project in coordination with the test requestor when using the appropriate vehicle information and vehicle dynamics modeling. Nevertheless, this procedure and its results do not replace the vehicle-level test to demonstrate compliance to FMVSS (105 for hydraulic brake systems or 121 for air-over-hydraulic brake systems), or other mandatory regulations (like ECE R13 or equivalents). Vehicle and braking systems development is fast-paced, and involves a global supplier base. This Recommended Practice provides an inertia-dynamometer test procedure that is repeatable and cost-effective. It evaluates the performance of the brake corner and its components (including friction material) by following the test procedure and sequence as indicated in the Federal Motor Vehicle Safety Standard (FMVSS) 105. Data from this Recommended Practice may be combined with other brake system and vehicle characteristics to predict vehicle performance.Since the first release of the FMVSS 105, there have been numerous inertia-dynamometer test protocols developed and used by the industry with different approaches and levels of detail. The SAE Truck and Bus Hydraulic Brake Committee considers laboratory test procedures useful in supporting harmonization to improve the overall performance and safety of motor vehicle braking systems.

Low-duty Inertia Dynamometer Hydraulic Brake Wear Test Procedures for Vehicles Above 4536 Kg (10 000 Lb) of GVWR

Author : Truck and Bus Hydraulic Brake Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Low-duty Inertia Dynamometer Hydraulic Brake Wear Test Procedures for Vehicles Above 4536 Kg (10 000 Lb) of GVWR by : Truck and Bus Hydraulic Brake Committee

Download or read book Low-duty Inertia Dynamometer Hydraulic Brake Wear Test Procedures for Vehicles Above 4536 Kg (10 000 Lb) of GVWR written by Truck and Bus Hydraulic Brake Committee and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Recommended Practice is derived from OEM and tier-1 laboratory tests and applies to two-axle multipurpose passenger vehicles, or trucks with a GVWR above 4536 kg (10 000 pounds) equipped with hydraulic disc or drum service brakes. Before conducting testing for a specific brake sizes or under specific test conditions, review, agree upon, and document with the test requestor any deviations from the test procedure. Also, the applicable criteria for the final test results and wear rates deemed as significantly different require definition, assessment, and proper documentation; especially as this will determine whether or not Method B testing is needed.This Recommended Practice does not evaluate or quantify other brake system characteristics such as performance, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice. Consistency and margin of pass/fail of the minimum requirements related to wear rates and wear behavior can be assessed as part of the project in coordination with the test requestor.NOTE: This Recommended Practice uses the unit conversion and rounding techniques from the NIST Special Publication 811. This to ensure the use of standard conversion factors and to determine the appropriate number of significant digits to ensure the Rounding Error (RE) of the converted unit is smaller than or similar to the RE of the original English or Imperial unit. Certain vehicle applications (like flat-bed recovery vehicles) have driving patterns which are considered light-duty with (a) friction material temperatures remaining under 232.0 °C (450 °F) 2.03 to 2.54 mm (0.08 to 0.1 inch) below the braking surface for at least 90% of the time, and (b) brake applications which require 2690 kPa (390 lbf/in2) or less of hydraulic pressure. This Recommended Practice provides two inertia-dynamometer test procedures, which are repeatable and cost-effective to assess, screen, benchmark, troubleshoot, or fingerprint a given foundation brake regarding low-duty brake wear. The first procedure (or Method A) is a wear versus temperature test from 93.0 to 427.0 °C (200 to 800 °F) to determine if there are potential wear rate issues under low temperature conditions and a low-duty driving cycle. If deemed required after the initial wear versus temperature test (Method A), or upon direct customer request, the second procedure (or Method B) provides an extensive wear test at a constant temperature of 79.0 °C (175 °F) to determine the wear rates and behavior of the friction couple. Data from this Recommended Practice may be combined with other brake system and vehicle characteristics for a comprehensive product characterization program.Since other wear test procedures cover a different (higher) range of operating temperatures, kinetic energies, and levels, the accelerated wear rate behavior of certain friction materials under low-duty regimes is not properly determined or estimated using test conditions which can affect the transfer layer behavior. The wear test method implemented in this Recommended Practice was derived from prior field testing and correlation investigation. Hence, careful attention was given to not alter the sequence and test conditions which have demonstrated correspondence to the vehicle behavior.The SAE Truck and Bus Hydraulic Brake Committee considers laboratory test procedures useful in supporting harmonization to improve the overall performance, durability, and safety of motor vehicle braking systems using relevant and cost-effective protocols.

Brake NVH

Author : James K Thompson
Publisher : SAE International
ISBN 13 : 0768053714
Total Pages : 158 pages
Book Rating : 4.7/5 (68 download)

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Book Synopsis Brake NVH by : James K Thompson

Download or read book Brake NVH written by James K Thompson and published by SAE International. This book was released on 2011-03-29 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: As other vehicle systems have become more refined, more attention must be placed on brake NVH issues because they can cause a negative customer experience. From the laboratory to the road, the use of technology as well as further study by engineers is helping to lessen noise, judder, and vibration in cars. This book provides readers with a fundamental understanding of current practices for measuring and testing brake NVH. From coverage of basic definitions and concepts to in-depth analysis of on-road testing procedures, it will serve as a comprehensive reference guide for brake test technicians, test engineers, lab managers, and others who work on making brakes quieter, smoother, more refined, and more reliable. Readers will learn how to test for brake noise, what tools to use, and which recent standards and practices have led to the successful measurement of brake noise and vibration. Topics covered include: • Common brake noise and vibration issues • Instrumentation, transducers, and other technical details • Measurement practice for laboratory and on-road testing • Brake pad damping and natural frequencies • Current trends in brake noise and vibration measurements

Disc and Drum Brake Dynamometer Squeal Noise Test Procedure

Author : Brake NVH Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Disc and Drum Brake Dynamometer Squeal Noise Test Procedure by : Brake NVH Standards Committee

Download or read book Disc and Drum Brake Dynamometer Squeal Noise Test Procedure written by Brake NVH Standards Committee and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SAE J2521 procedure is applicable to high frequency squeal noise occurrences for on-road passenger car and light trucks below 4,540 kg of GVWR. The procedure incorporates high temperature and low temperature test matrixes, but does not fully account for the effects of the environment on brake squeal. Much research is currently underway in this area and can potentially be incorporated in future revisions.For the purposes of this test procedure, squeal is defined as peak noise levels equal to or above 70 dB(A) between 1.25 kHz and 16 kHz for tests using a full suspension corners or full axle assemblies, or between 2 kHz and 16 kHz for brakes not using a full suspension corner.Before using this Recommended Practice for chassis dynamometer testing, review in detail the specifics related to at least (a) instrumentation including in-cabin microphones, (b) threshold levels for noise detection, (c) temperature control priority between front and rear axles, (d) vehicle loading and load distribution, (e) cooling air and environmental conditioning, and (f) detailed nomenclature and labeling of channels and sensors. The current revision of the SAE J2521 includes updates and changes to (a) accommodate for modern testing technologies, (b) improve the squeal noise evaluation matrixes for disc and drum brakes, (c) bring the document into the new SAE format standard, (d) revise its formatting for clearer test sequences, and (e) improve and harmonize definitions, noise evaluation, test setup and conditions, test inertia calculations, and data analysis with other SAE dynamometer test procedures and recent standards and developments from the EKB/VDA working groups in Europe. Lastly, this revision uses lower final temperatures during the fade sections to better represent vehicle-level testing while offering a more severe fade schedule as optional.

Disc and Drum Brake Dynamometer Low-Frequency Noise Test Procedure

Author : Brake NVH Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Disc and Drum Brake Dynamometer Low-Frequency Noise Test Procedure by : Brake NVH Standards Committee

Download or read book Disc and Drum Brake Dynamometer Low-Frequency Noise Test Procedure written by Brake NVH Standards Committee and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This test procedure outlines the necessary test equipment (test fixture, dynamometer, data acquisition system, etc.) and test sequence required to test for low-frequency brake noise (200 Hz to 1.25 kHz) on a brake noise dynamometer. It is intended to complement SAE J2521, which focuses on high-frequency brake squeal. This RP applies to passenger cars and light trucks with a gross vehicle weight rating below 4536 kg. Before using this RP for heavier vehicles, consult and agree with the test requestor and the testing facility. The development of this SAE Recommended Practice (RP) was based on a vehicle with known low-frequency noise from field and chassis dynamometer testing. The main test sequence reflected on this RP was able to reproduce on an inertia dynamometer the dominant frequencies measured on the vehicle. During the development of this RP, fixture design and fingerprinting for frequency response, along with the actual test sequence and the data analysis, proved to be the three main elements to allow the measurement and detection of noisy brake events below 1 kHz.

FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4540 Kg GVWR

Author : Truck and Bus Hydraulic Brake Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4540 Kg GVWR by : Truck and Bus Hydraulic Brake Committee

Download or read book FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4540 Kg GVWR written by Truck and Bus Hydraulic Brake Committee and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Recommended Practice is derived from the FMVSS 105 vehicle test and applies to two-axle multipurpose passenger vehicles, trucks, and buses with a GVWR above 4540 kg (10000 pounds) equipped with hydraulic service brakes. There are two main test sequences: Development Test Sequence for generic test conditions when not all information is available or when an assessment of brake output at different inputs are required, and FMVSS Test Sequence when vehicle parameters for brake pressure as a function of brake pedal input force and vehicle-specific loading and brake distribution are available. The test sequences are derived from the Federal Motor Vehicle Safety Standard 105 (and 121 for optional sections) as single-ended inertia-dynamometer test procedures when using the appropriate brake hardware and test parameters. This recommended practice provides Original Equipment Manufacturers (OEMs), brake and component manufacturers, as well as aftermarket suppliers, results related to brake output, friction material effectiveness, and corner performance in a laboratory-controlled test environment.The test sequences include different dynamic conditions (braking speeds, temperature, and braking history as outlined in the FMVSS 105); inertia loads equivalent to the vehicle's LLVW and GVWR; fully operational, partial failure, and failed system conditions. All applicable sections of the FMVSS 105 are included. Optional sections include: parking brake output, water recovery, TP-121D dynamometer retardation, and 32 km/h (20 mph) stops to simulate Federal Motor Carrier Safety Administration (FMCSA) requirements.This recommended practice does not evaluate or quantify other brake system characteristics such as wear, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice. Consistency and margin of pass/fail of the minimum requirements related to stopping distance or equivalent deceleration levels of the FMVSS 105 vehicle test can be assessed as part of the project in coordination with the test requestor when using the appropriate vehicle information and vehicle dynamics modeling. Nevertheless, this procedure and its results do not replace the vehicle-level test to demonstrate compliance to FMVSS (105 for hydraulic brake systems, or 121 for air-over-hydraulic brake systems), or other mandatory regulations (like ECE R13 or equivalents). The current version of this Recommended Practice: (a) addresses proper and consistent use of units of measure and numerical values per NIST 811:2008, and (b) clarifies thermocouple location and temperature controls during the test. The technical content, the test conditions, and the test sequences remain unchanged.

Low-Duty Inertia Dynamometer Hydraulic Brake Wear Test Procedures for Vehicles Above 4536 Kg (10000 Pounds) of GVWR

Author : Truck and Bus Hydraulic Brake Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Low-Duty Inertia Dynamometer Hydraulic Brake Wear Test Procedures for Vehicles Above 4536 Kg (10000 Pounds) of GVWR by : Truck and Bus Hydraulic Brake Committee

Download or read book Low-Duty Inertia Dynamometer Hydraulic Brake Wear Test Procedures for Vehicles Above 4536 Kg (10000 Pounds) of GVWR written by Truck and Bus Hydraulic Brake Committee and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Recommended Practice is derived from OEM and tier-1 laboratory tests and applies to two-axle multipurpose passenger vehicles, or trucks with a GVWR above 4536 kg (10 000 pounds) equipped with hydraulic disc or drum service brakes. Before conducting testing for a specific brake sizes or under specific test conditions, review, agree upon, and document with the test requestor any deviations from the test procedure. Also, the applicable criteria for the final test results and wear rates deemed as significantly different require definition, assessment, and proper documentation; especially as this will determine whether or not Method B testing is needed.This Recommended Practice does not evaluate or quantify other brake system characteristics such as performance, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice. Consistency and margin of pass/fail of the minimum requirements related to wear rates and wear behavior can be assessed as part of the project in coordination with the test requestor.NOTE: This Recommended Practice uses the unit conversion and rounding techniques from the NIST Special Publication 811. This to ensure the use of standard conversion factors and to determine the appropriate number of significant digits to ensure the Rounding Error (RE) of the converted unit is smaller than or similar to the RE of the original English or Imperial unit. SAE J3006 has been reaffirmed to comply with the SAE Five-Year Review policy.

Road Vehicles. Brake Lining Assemblies. Inertia Dynamometer Test Method

Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580471001
Total Pages : 28 pages
Book Rating : 4.4/5 (71 download)

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Book Synopsis Road Vehicles. Brake Lining Assemblies. Inertia Dynamometer Test Method by : British Standards Institute Staff

Download or read book Road Vehicles. Brake Lining Assemblies. Inertia Dynamometer Test Method written by British Standards Institute Staff and published by . This book was released on 2006-01-17 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Road vehicles, Brake linings, Braking systems, Braking system components, Brake pads, Road vehicle components, Inertia, Inspection, Performance testing, Mechanical testing, Approval testing, Acceptance (approval), Velocity, Formulae (mathematics), Torque, Classification systems, Testing conditions, Test equipment

Inertia Calculation for Single-Ended Inertia-Dynamometer Testing

Author : Brake Dynamometer Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Inertia Calculation for Single-Ended Inertia-Dynamometer Testing by : Brake Dynamometer Standards Committee

Download or read book Inertia Calculation for Single-Ended Inertia-Dynamometer Testing written by Brake Dynamometer Standards Committee and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This procedure provides methods to determine the appropriate inertia values for all passenger cars and light trucks up to 4540 kg of GVWR. For the same vehicle application and axle (front or rear), different tests sections or brake applications may use different inertia values to reflect the duty-cycle and loading conditions indicated on the specific test. New powertrain technologies including regenerative braking require a different approach to determine or estimate the correct test inertia for the foundation brake. This revision provides some key concepts to take into account for regen braking evaluation, and guidelines or default calculations to adjust the test inertia for a given vehicle application.

Wear Test Procedure on Inertia Dynamometer for Brake Friction Materials

Author : Brake Dynamometer Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Wear Test Procedure on Inertia Dynamometer for Brake Friction Materials by : Brake Dynamometer Standards Committee

Download or read book Wear Test Procedure on Inertia Dynamometer for Brake Friction Materials written by Brake Dynamometer Standards Committee and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This SAE Recommended Practice specifies a dynamometer test procedure to be used for the measurement of automotive service brake linings and disc brake pads wear. Special motor vehicles and motorcycles are excluded from the application. Trailers with nominal Gross Combination Weight Rating exceeding 40 tons are also excluded from this Recommended Practice.

FMVSS 135 Inertia Dynamometer Test Procedure

Author : Brake Dynamometer Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis FMVSS 135 Inertia Dynamometer Test Procedure by : Brake Dynamometer Standards Committee

Download or read book FMVSS 135 Inertia Dynamometer Test Procedure written by Brake Dynamometer Standards Committee and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Recommended Practice is derived from the Federal Motor Vehicle Safety Standard 135 vehicle test protocol as a single-ended inertia-dynamometer test procedure. It measures brake output, friction material effectiveness, and corner performance in a controlled and repeatable environment. The test procedure also includes optional sections for parking brake output performance for rear brakes. It is applicable to brake corners from vehicles covered by the FMVSS 135 when using the appropriate brake hardware and test parameters. This procedure is applicable to all passenger cars and light trucks up to 3500 kg of GVWR.This Recommended Practice is the result of an industry effort to develop an inertia-dynamometer test procedure based upon the FMVSS 135 vehicle test. Results from this test provide a laboratory assessment of the brake corner performance. Data from this Recommended Practice may be combined with other brake system and vehicle characteristics to predict vehicle performance. The conditions defined in this Recommended Practice are drawn from FMVSS 135 vehicle test experience. The deceleration levels are not necessarily based on those needed to meet the requirements of the FMVSS 135. This procedure is intended to properly represent the lining conditioning which occurs during an FMVSS 135 vehicle test.

Inertia-dynamometer Disc Brake Drag Measurement Test Procedure for Vehicles Less Than 4540 Kg GVWR

Author : Brake Dynamometer Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Inertia-dynamometer Disc Brake Drag Measurement Test Procedure for Vehicles Less Than 4540 Kg GVWR by : Brake Dynamometer Standards Committee

Download or read book Inertia-dynamometer Disc Brake Drag Measurement Test Procedure for Vehicles Less Than 4540 Kg GVWR written by Brake Dynamometer Standards Committee and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Recommended Practice applies to on-road vehicles with a GVWR below 4540 kg equipped with disc brakes. This Recommended Practice is the result of an industry effort to develop inertia-dynamometer test procedures to assess brake drag under a series of speed, pressure, and temperature conditions. The test allows the project or application engineer to determine or compare the amount of brake drag for a given design level or configuration. The test provides a standard method to better quantify and better understand the parasitic (drag) torque generated by the brake corner during the off-brake condition under repeatable laboratory conditions.This inertia-dynamometer test procedure provides a method to quantify brake drag measurements combining light, moderate, and severe braking with a brake drag matrix. This matrix combines increasing static preconditioning pressure applications before measuring brake drag at increasing braking speeds. Data from this test is useful to assess the influence of certain design features, determine brake sensitivity to braking conditions, and support a comprehensive brake performance evaluation in conjunction with other measurements for pedal feel, noise, performance, and durability. Elements from this recommended practice are also applicable or useful for other laboratory test procedures to assess brake drag following standard fuel economy cycles. To better characterize the brake drag behavior of a given brake corner, include other brake drag procedures which rely more on vehicle-level evaluations. These inertia dynamometer evaluations use speed profiles and test sequences to replicate coast-down testing from proving ground testing.Due to the novelty of this Recommended Practice, the Task Force encourages users of this document to contact the SAE Staff Representative for Ground Vehicle; Motor Vehicle Council; Chassis Systems Group; Foundation Brake Steering Committee, or the Chairman of the Brake Dynamometer Standards Committee with questions and comments. This feedback will prove valuable for future revisions and updates to the Recommended Practice. The Task Force is working on developing an example of the test output to present the recommended report layout.This SAE Recommended Practice is intended as a guide towards standard practices and is subject to change to keep pace with experience and technical advances.

Inertia Dynamometer Rotor Crack Test Procedure for Air Disc Brakes

Author : Truck and Bus Foundation Brake Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Inertia Dynamometer Rotor Crack Test Procedure for Air Disc Brakes by : Truck and Bus Foundation Brake Committee

Download or read book Inertia Dynamometer Rotor Crack Test Procedure for Air Disc Brakes written by Truck and Bus Foundation Brake Committee and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Recommended Practice applies to commercial vehicles equipped with air disc brakes and above 4536 kg of Gross Vehicle Weight Rating. Other assessments on the friction material or rotor related to wear, durability, correlation to product life, noise, judder, compliance to specific regulations, etc., are not part of this RP (Recommended Practice). This revision of the SAE J3080 includes typographical corrections and provides the proper internal references to other sections or items in the document. The original rationale from the original release is still applicable.Brake rotor cracks on commercial vehicles can compromise the structural integrity of the foundation brake. These failures can amount to significant maintenance and downtime costs. In order to provide an early assessment of this failure mode, vehicle manufacturers as well as brake suppliers have developed multiple laboratory test procedures. These procedures determine (using different test methods and test approaches) the propensity of a given friction couple (brake rotor and friction material) to develop cracks which can render the brakes out-of-service.It is the objective of this Recommended Practice (RP) to establish a uniform and industry-endorsed laboratory method which reflects the most commonly used inertia dynamometer test procedure. This RP harmonizes the test conditions when applicable, and determines the minimum requirements for the test system used to conduct the test. The two methods included on this RP reflect the two main approaches to rotor crack testing. Method A uses a bedding cycle at 200 °C and 300 °C, and incorporates performance (torque output) versus pressure during the bedding; Method B uses a single bedding cycle at 150 °C. This RP also presents the method and criteria to assess and report rotor cracks. This RP applies when comparing test results to a baseline, a product specification, or a legacy product design.

Disc Brake Dynamometer Squeal Noise Matrix

Author : Brake Dynamometer Standards Committee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Disc Brake Dynamometer Squeal Noise Matrix by : Brake Dynamometer Standards Committee

Download or read book Disc Brake Dynamometer Squeal Noise Matrix written by Brake Dynamometer Standards Committee and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This procedure is applicable to high frequency squeal type noise occurrences for passenger car and light truck type vehicles that are used under conventional operating conditions. The procedure does not encompass the consequences associate with changes in environment relate to temperature and humidity variations. PurposeThis recommended test practice is intended to establish a common universally recognized method for performing a series of screening test sequences that identify the propensity of a brake assembly to generate squeal noise under a variety of test conditions.