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The Vibration Characteristics Of A Coupled Helicopter Rotor Fuselage By A Finite Element Analysis
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Book Synopsis The Vibration Characteristics of a Coupled Helicopter Rotor-fuselage by a Finite Element Analysis by : Michael J. Rutkowski
Download or read book The Vibration Characteristics of a Coupled Helicopter Rotor-fuselage by a Finite Element Analysis written by Michael J. Rutkowski and published by . This book was released on 1983 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic coupling between the rotor system and the fuselage of a simplified helicopter model in hover is analytically investigated. Mass, aerodynamic damping, and elastic and centrifugal stiffness matrices are presented for the analytical model; the model is based on a beam finite element, with polynomial mass and stiffness distributions for both the rotor and fuselage representations. For this analytical model, only symmetric fuselage and collective blade degrees of freedom are treated. Real and complex eigen-analyses are carried out to obtain coupled rotor-fuselage natural modes and frequencies as a function of rotor speed. Vibration response results are obtained are the coupled system subjected to a radially uniform, harmonic blade loading. The coupled response results are compared with response results from an uncoupled analysis in which hub loads for an isolated rotor system subjected to the same sinusoidal blade loading as the coupled system are applied to a free-free fuselage. It is shown that although the fuselage response as a function of forcing frequency and rotor speed is similar in the two cases, the responses resulting from the approximate, uncoupled analysis are significantly greater than those resulting from the coupled analysis.
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.
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1986 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book NASA Technical Paper written by and published by . This book was released on 1983 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coupled Rotor/fuselage Dynamic Analysis of the AH-1G Helicopter and Correlation with Flight Vibrations Data by :
Download or read book Coupled Rotor/fuselage Dynamic Analysis of the AH-1G Helicopter and Correlation with Flight Vibrations Data written by and published by . This book was released on 1989 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Coupled Rotor-fuselage Vibration Analysis for Helicopter Rotor System Fault Detection by : Mao Yang
Download or read book A Coupled Rotor-fuselage Vibration Analysis for Helicopter Rotor System Fault Detection written by Mao Yang and published by . This book was released on 2002 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723548345 Total Pages :228 pages Book Rating :4.5/5 (483 download)
Book Synopsis Correlation of Ah-1g Airframe Flight Vibration Data with a Coupled Rotor-Fuselage Analysis by : National Aeronautics and Space Administration (NASA)
Download or read book Correlation of Ah-1g Airframe Flight Vibration Data with a Coupled Rotor-Fuselage Analysis written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formulation and features of the Rotor-Airframe Comprehensive Analysis Program (RACAP) is described. The analysis employs a frequency domain, transfer matrix approach for the blade structural model, a time domain wake or momentum theory aerodynamic model, and impedance matching for rotor-fuselage coupling. The analysis is applied to the AH-1G helicopter, and a correlation study is conducted on fuselage vibration predictions. The purpose of the study is to evaluate the state-of-the-art in helicopter fuselage vibration prediction technology. The fuselage vibration predicted using RACAP are fairly good in the vertical direction and somewhat deficient in the lateral/longitudinal directions. Some of these deficiencies are traced to the fuselage finite element model. Sangha, K. and Shamie, J. Unspecified Center NASA-CR-181974, NAS 1.26:181974 NAS1-17498; RTOP 505-63-51-01...
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 Sensitivity Analysis of Torsional Vibration Characteristics of Helicopter Rotor Blades. Part 2: Aerodynamics and Sensitivity Analysis by :
Download or read book Sensitivity Analysis of Torsional Vibration Characteristics of Helicopter Rotor Blades. Part 2: Aerodynamics and Sensitivity Analysis written by and published by . This book was released on 1974 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical investigation of dynamic response characteristics of rotor blades was carried out with special emphasis on torsional degrees-of-freedom. Coupled equations of motion for flapwise bending and torsion were formulated at varying azimuth positions for rotor blades with noncollinear aerodynamic, elastic and mass axes. Both structural and aerodynamic mass, damping and stiffness coefficients were included. The variations of a sample blade at different flight conditions were investigated from these equations. The obtained numerical results were illustrated. The sensitivity of overall blade vibration characteristics to torsional oscillations was also investigated from the equations of motion for the sample blade. The illustrated results show the importance of torsional degrees-of-freedom in rotor blade analysis. Various possibilities of improving the overall response by tuning blade geometric, structural and aerodynamic characteristics are discussed.
Book Synopsis Finite Element Stability Analysis for Coupled Rotor and Support Systems by :
Download or read book Finite Element Stability Analysis for Coupled Rotor and Support Systems written by and published by . This book was released on 1977 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Scientific and Technical Publications by :
Download or read book NASA Scientific and Technical Publications written by and published by . This book was released on 1987 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1991 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1983 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
