Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 252
Book Description
Investigation of Difficult Component Effects on Finite Element Model Vibration Prediction for the Bell AG-1G Helicopter. Volume 2: Correlation Results
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 252
Book Description
Investigation of Difficult Component Effects on Finite Element Model Vibration Prediction for the Bell AH-1G Helicopter. Volume 1: Ground Vibration Test Results
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 222
Book Description
Investigation of Difficult Component Effects on Finite Element Model Vibration Prediction for the Bell Ag-1g Helicopter. Volume 2
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781724266477
Category :
Languages : en
Pages : 234
Book Description
Under the NASA-sponsored DAMVIBS (Design Analysis Methods for VIBrationS) program, a series of ground vibration tests and NASTRAN finite element model (FEM) correlations were conducted on the Bell AH-1G helicopter gunship to investigate the effects of difficult components on the vibration response of the airframe. Previous correlations of the AG-1G showed good agreement between NASTRAN and tests through 15 to 20 Hz, but poor agreement in the higher frequency range of 20 to 30 Hz. Thus, this effort emphasized the higher frequency airframe vibration response correlations and identified areas that need further R and T work. To conduct the investigations, selected difficult components (main rotor pylon, secondary structure, nonstructural doors/panels, landing gear, engine, furl, etc.) were systematically removed to quantify their effects on overall vibratory response of the airframe. The entire effort was planned and documented, and the results reviewed by NASA and industry experts in order to ensure scientific control of the testing, analysis, and correlation exercise. In particular, secondary structure and damping had significant effects on the frequency response of the airframe above 15 Hz. Also, the nonlinear effects of thrust stiffening and elastomer mounts were significant on the low frequency pylon modes below main rotor 1p (5.4 Hz). The results of the NASTRAN FEM correlations are given. Dompka, R. V. Unspecified Center NASA-CR-181916-VOL-2, NAS 1.26:181916-VOL-2, BHT-699-099-251-VOL-2 NAS1-17496; RTOP 505-63-51-01...
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 976
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Investigation of Difficult Component Effects on Finite Element Model Vibration Prediction for the Bell Ah-1g Helicopter. Volume 1
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781724267177
Category :
Languages : en
Pages : 220
Book Description
Under the NASA-sponsored Design Analysis Methods for VIBrationS (DAMVIBS) program, a series of ground vibration tests and NASTRAN finite element model (FEM) correlations were conducted on the Bell AH-1G helicopter gunship to investigate the effects of difficult components on the vibration response of the airframe. Previous correlations of the AH-1G showed good agreement between NASTRAN and tests through 15 to 20 Hz, but poor agreement in the higher frequency range of 20 to 30 Hz. Thus, this effort emphasized the higher frequency airframe vibration response correlations and identified areas that need further R and T work. To conduct the investigations, selected difficult components (main rotor pylon, secondary structure, nonstructural doors/panels, landing gear, engine, fuel, etc.) were systematically removed to quantify their effects on overall vibratory response of the airframe. The entire effort was planned and documented, and the results reviewed by NASA and industry experts in order to ensure scientific control of the testing, analysis, and correlation exercise. In particular, secondary structure and damping had significant effects on the frequency response of the airframe above 15 Hz. Also, the nonlinear effects of thrust stiffening and elastomer mounts were significant on the low frequency pylon modes below main rotor 1p (5.4 Hz). The results of the ground vibration testing are presented. Dompka, R. V. Unspecified Center NASA-CR-181916-VOL-1, NAS 1.26:181916-VOL-1 NAS1-17496; RTOP 505-63-51-01...
NASA SP.
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 580
Book Description
The NASA/industry Design Analysis Methods for Vibrations (DAMVIBS) Program: Accomplishments and Contributions
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 40
Book Description
Government Reports Annual Index
Author: Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1024
Book Description
The Shock and Vibration Digest
Author: Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 460
Book Description
Government Reports Announcements & Index
Author: Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1040
Book Description
