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Rotating Shake Test And Modal Analysis Of A Model Helicopter Rotor Blade
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Book Synopsis Rotating Shake Test and Modal Analysis of a Model Helicopter Rotor Blade by : W. Keats Wilkie
Download or read book Rotating Shake Test and Modal Analysis of a Model Helicopter Rotor Blade written by W. Keats Wilkie and published by . This book was released on 1997 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rotating Shake Test and Modal Analysis of a Model Helicopter Rotor Blade by : W. Keats Wilkie
Download or read book Rotating Shake Test and Modal Analysis of a Model Helicopter Rotor Blade written by W. Keats Wilkie and published by . This book was released on 1997 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ROTATING SHAKE TEST AND MODAL ANALYSIS OF A MODEL HELICOPTER ROTOR BLADE... NASA-TM-4760... SEP. 16, 1997 by : United States. National Aeronautics and Space Administration
Download or read book ROTATING SHAKE TEST AND MODAL ANALYSIS OF A MODEL HELICOPTER ROTOR BLADE... NASA-TM-4760... SEP. 16, 1997 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Rotating Beam Problem in Helicopter Dynamics by : Ranjan Ganguli
Download or read book The Rotating Beam Problem in Helicopter Dynamics written by Ranjan Ganguli and published by Springer. This book was released on 2017-10-14 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book addresses computational methods for solving the problem of vibration, response, loads and stability of a helicopter rotor blade modeled as a rotating beam with flap or out-of-plane bending. The focus is on explaining the implementation of the finite element method in the space and time domain for the free vibration, aeroelastic response and stability problems. The use of Floquet analysis for the aeroelastic stability analysis of rotor blades is also shown. The contents of the book will be useful to researchers in aerodynamics and applied mechanics, and will also serve well professionals working in the aerospace industry.
Book Synopsis Experimental and Analytical Investigation of the Vibration Characteristics of a Remotely Piloted Helicopter by : William T. Trainer
Download or read book Experimental and Analytical Investigation of the Vibration Characteristics of a Remotely Piloted Helicopter written by William T. Trainer and published by . This book was released on 1992 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Data from a Wind-tunnel Test of Two Main-rotor Blade Designs for a Utility-class Helicopter by : Jeffrey D. Singleton
Download or read book Performance Data from a Wind-tunnel Test of Two Main-rotor Blade Designs for a Utility-class Helicopter written by Jeffrey D. Singleton and published by DIANE Publishing. This book was released on 1990 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimizing Tuning Masses for Helicopter Rotor Blade Vibration Reduction Including Computed Airloads and Comparison with Test Data by :
Download or read book Optimizing Tuning Masses for Helicopter Rotor Blade Vibration Reduction Including Computed Airloads and Comparison with Test Data written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of Helicopter Rotor Loads from Blade Structural Response by : Daiju Uehara
Download or read book Estimation of Helicopter Rotor Loads from Blade Structural Response written by Daiju Uehara and published by . This book was released on 2019 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measuring the load distribution along a helicopter rotor blade has been one of the most challenging tasks in experimental aeromechanics. Conventional loads measurements with on-blade instrumentation, such as pressure transducers for airloads and strain gages for structural loads, require the experimentalist to overcome a large number of technical barriers; for example, sensor integration to the rotor blade structure, sensor failure due to strong centrifugal forces, and influence of sensor installation on rotor blade dynamics. The goal of this dissertation is to develop a new, combined experimental and theoretical methodology to estimate helicopter rotor loads without using these conventional on-blade sensors. The rotor loads estimation methodology begins with the measurement of blade structural deformation measurements using non-contact, optical, time-resolved Digital Image Correlation (DIC). The time-resolved DIC technique successfully showed its capability of measuring the three-dimensional deformation time history of a rotating blade for both a small- and a large-scale rotor in hover. The modal properties (natural frequencies, mode shapes, damping ratios, and modal coordinates) of the blade in the rotating-frame were then extracted from the deformation time history using Natural Excitation Technique - Eigensystem Realization Algorithm (NExT-ERA) and Complexity Pursuit (CP), which are operational modal analysis (OMA) algorithms. The first three modes were identified by the OMA algorithms and well correlated with a numerical model. Rotor loads were then finally estimated based on the measured deformations and blade modal characteristics. Having validated the present approach incrementally with measurements performed on rotors at different scales, configurations, and operating conditions, the current study estimated the spanwise lift distribution and integrated thrust at the hub for a 2 m-diameter, two-bladed, isolated single rotor in hover. Due to a lack of participating modes (only the first and second flap modes), the estimated sectional lift distribution did not capture the lift loss typically observed at regions of the blade tip and induced by trailing tip vortices. Nevertheless, the mean value of the estimated thrust at the rotor hub was within 5% of the measured value for all the operating conditions
Book Synopsis Sensitivity Analysis of Torsional Vibration Characteristics of Helicopter Rotor Blades. Part 1: Structural Dynamics Analysis by :
Download or read book Sensitivity Analysis of Torsional Vibration Characteristics of Helicopter Rotor Blades. Part 1: Structural Dynamics Analysis written by and published by . This book was released on 1974 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical investigation of structural vibration characteristics of rotor blades was carried out. Coupled equations of motion for flapwise bending and torsion were formulated for rotor blades with noncollinear elastic and mass axes. The finite element method was applied for a detailed representation of blade structural properties. Coupled structural mass and stiffness coefficients were evaluated. The range of validity of a set of coupled equations of motion linearized with respect to eccentricity between elastic and mass axes was investigated. The sensitivity of blade vibration characteristics to torsion were evaluated by varying blade geometric properties, boundary conditions, and eccentricities between mass and elastic axes.
Book Synopsis Ground Shake Test of the UH-60A Helicopter Airframe and Comparison with NASTRAN Finite Element Model Predictions by :
Download or read book Ground Shake Test of the UH-60A Helicopter Airframe and Comparison with NASTRAN Finite Element Model Predictions written by and published by . This book was released on 1990 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Higher Harmonic Control Analysis for Vibration Reduction of Helicopter Rotor Systems by :
Download or read book Higher Harmonic Control Analysis for Vibration Reduction of Helicopter Rotor Systems written by and published by . This book was released on 1994 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of Rotating Mode Shapes and Natural Frequencies of a Helicopter Rotor Blade Using the Non-rotating Mode Shapes as Generalized Coordinates by : Randall F. Smith
Download or read book Determination of Rotating Mode Shapes and Natural Frequencies of a Helicopter Rotor Blade Using the Non-rotating Mode Shapes as Generalized Coordinates written by Randall F. Smith and published by . This book was released on 1985 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Helicopter Blade Dynamic Loads Measured During Performance Testing of Two Scaled Rotors by : John D. Berry
Download or read book Helicopter Blade Dynamic Loads Measured During Performance Testing of Two Scaled Rotors written by John D. Berry and published by . This book was released on 1987 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Helicopter Rotor Blade Design for Minimum Vibration by : Robert B. Taylor
Download or read book Helicopter Rotor Blade Design for Minimum Vibration written by Robert B. Taylor and published by . This book was released on 1984 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721985265 Total Pages :554 pages Book Rating :4.9/5 (852 download)
Book Synopsis Loads and Performance Data from a Wind-Tunnel Test of Generic Model Helicopter Rotor Blades by : National Aeronautics and Space Administration (NASA)
Download or read book Loads and Performance Data from a Wind-Tunnel Test of Generic Model Helicopter Rotor Blades written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted in the NASA Langley Transonic Dynamics Tunnel to acquire data for use in assessing the ability of current and future comprehensive analyses to predict helicopter rotating-system and fixed-system vibratory loads. The investigation was conducted with a generic model helicopter rotor system using blades with rectangular planform, no built-in twist, uniform radial distribution of mass and stiffnesses, and a NACA 0012 airfoil section. Rotor performance data, as well as mean and vibratory components of blade bending and torsion moments, fixed-system forces and moments, and pitch link loads were obtained at advance ratios up to 0.35 for various combinations of rotor shaft angle-of-attack and collective pitch. The data are presented without analysis. Yeager, William T., Jr. and Wilbur, Matthew L. Langley Research Center 23-065-40-30...
Book Synopsis Sensitivity Analysis of Torsional Vibration Characteristics of Helicopter Rotor Blades by : Theodore Bratanow
Download or read book Sensitivity Analysis of Torsional Vibration Characteristics of Helicopter Rotor Blades written by Theodore Bratanow and published by . This book was released on 1974 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723484643 Total Pages :122 pages Book Rating :4.4/5 (846 download)
Book Synopsis Vibratory Loads Data from a Wind-Tunnel Test of Structurally Tailored Model Helicopter Rotors by : National Aeronautics and Space Administration (NASA)
Download or read book Vibratory Loads Data from a Wind-Tunnel Test of Structurally Tailored Model Helicopter Rotors written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was conducted in the Langley Transonic Dynamics Tunnel to investigate the use of a Bell Helicopter Textron (BHT) rotor structural tailoring concept, known as rotor nodalization, in conjunction with advanced blade aerodynamics as well as to evaluate rotor blade aerodynamic design methodologies. A 1/5-size, four-bladed bearingless hub, three sets of Mach-scaled model rotor blades were tested in forward flight from transition up to an advance ratio of 0.35. The data presented pertain only to the evaluation of the structural tailoring concept and consist of fixed-system and rotating system vibratory loads. These data will be useful for evaluating the effects of tailoring blade structural properties on fixed-system vibratory loads, as well as validating analyses used in the design of advanced rotor systems. Yeager, William T., Jr. and Hamouda, M-Nabil H. and Idol, Robert F. and Mirick, Paul H. and Singleton, Jeffrey D. and Wilbur, Matthew L. Langley Research Center BELL AIRCRAFT; DYNAMIC STRUCTURAL ANALYSIS; HELICOPTER DESIGN; HELICOPTERS; ROTARY WINGS; ROTOR AERODYNAMICS; ROTOR BLADES; VIBRATORY LOADS; AIRCRAFT MODELS; HORIZONTAL FLIGHT; SCALE MODELS; TRANSONIC WIND TUNNELS; WIND TUNNEL TESTS...