by National Aeronautics and Space Administration, US Army Aviation Systems Command, Aviation R&T Activity, For sale by the National Technical Information Service in [Washington, DC], [St. Louis, Mo.], [Springfield, Va .
Written in English
|Statement||F.K. Choy ... [et al.].|
|Series||NASA technical memorandum -- 103797, AVSCOM technical report -- 90-C-033, AVSCOM technical report -- 90-C-33.|
|Contributions||Choy, Fred K., United States. Army Aviation Research and Technology Activity., United States. National Aeronautics and Space Administration.|
|The Physical Object|
This procedure couples the dynamics of the rotor-bearing gear system with the vibration in the gearbox structure. The modal synthesis method is used in solving the overall dynamics of the system, and a variable time-stepping integration scheme is used in evaluating the global transient vibration of the system. Locally each gear stage is modelled as a multimass rotor-bearing system using a discrete by: Modal analysis of multistage gear systems coupled with gearbox vibrations - NASA/ADS An analytical procedure to simulate vibrations in gear transmission systems is presented. This procedure couples the dynamics of the rotor-bearing gear system with the vibration in the gear box : F. K. Choy, Y. F. Ruan, Y. K. Tu, J. J. Zakrajsek, D. P. Townsend. An analytical procedure to simulate vibrations in gear transmission systems is presented. This procedure couples the dynamics of the rotor-bearing gear system with the vibration in the gear box . behavior of multistage gear transmission systems with the effects of gearbox induced vibrations and mass imbalances of the rotor. The modal method, with undamped frequencies and planar mode shapes, is used to reduce the degrees of freedom of the gear system for time-transient dynamic analysis. Both the.
There has been a vast amount of work in the analysis of multistage gearbox housings and the effects vibrations can have on them. This subject is of concern in the aerospace industry and is handled by Finite Element Analysis (FEA). Often experimental verification is required, particularly when a new design or material is introduced. The results show that the experimental values are in good agreement with the simulation values obtained by using the coupled system dynamics model for acceleration, which proves the accuracy of dynamic analysis for the coupled gearbox system. The vibration acceleration of the high-speed rotor (shaft 1to shaft 3) is within 1 m/s 2, and that of. A typical waveform of defected gear vibration signal. Indices: Indices have also been used in vibration analysis [8, 6]. The peak value, RMS level and their ratio crest factor are often used. mission system in the instrument were analysed and the frequency range between the first and second mode was used to avoid the effects of resonant vibrations of the power transmission. Torsional stiffness adjustment sections were installed in the power transmission system to .
The objective of this paper is to present a comprehensive approach to analyze the dynamic behavior of multi-stage gear transmission systems with the effects of gear box induced vibrations and rotor mass-imbalances. The modal method, using undamped frequencies and planar mode shapes, is used to reduce the degree of freedom of the system. The gearbox vibrations were obtained from both numerical simulation and experimental studies using a gear noise test rig. In addition, the noise generated by the gearbox vibrations was recorded. In this study, a gear-shaft-bearing-housing coupled impedance model is proposed to account for the effect of housing compliance on the vibration of geared transmission system. This proposed dynamic model offers convenient modeling, efficient computing, and ability to combine computed parameters with experimental ones. An electric drive gear system generally comprises four fundamental functional modules: electric machine, gearbox, power grid/power supply, and load device, as illustrated in Fig. electric machine converts the electrical energy from the power supply into mechanical energy when operating as a motor, and converts mechanical energy from the load device into electrical energy when operating.