scholarly journals Low-Order Radial Modal Test and Analysis of Drive Motor Stator

Machines ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 97
Author(s):  
Jie Li ◽  
Shaobo Yang ◽  
Jincai Yang ◽  
Fengqin Li ◽  
Qingqiang Zeng ◽  
...  
Keyword(s):  
Hybrid Electric Vehicle ◽  
Linear Structure ◽  
Modal Parameter ◽  
Electric Transmission ◽  
Modal Test ◽  
Drive Motor ◽  
Sweeping Method ◽  
Modal Parameter Estimation ◽  
Frequency Sweeping ◽  
Low Order

For a driving motor stator of EDU (Electric Drive Unit) intelligent electric transmission of a domestic plug-in hybrid electric vehicle, modal tests are performed on the motor stator with or without motor shell. Either the hammering method or the frequency sweeping method is used in the test. The modal frequencies, modal shapes, and damping ratios of the first five orders that meet the requirements of the modal confidence criterion are obtained. The influence of the motor shell on the low-order radial modal of the motor stator is discussed. The results show that similar results are obtained in the modal parameter estimation respectively using the hammering method and the frequency sweeping method. They can both be used for low-order radial modal test of the motor stator. The motor stator without shell exhibits a linear structure in the frequency domain. Each modal frequency obtained by the frequency sweeping method is slightly higher than that obtained by the hammering method.

Multiple Excitation Sine Testing: An Integrated Approach

1991 ◽  
Author(s):  
H. Van der Auweraer ◽  
D. Otte ◽  
J. Leuridan ◽  
W. Bakkers
Keyword(s):  
Normal Mode ◽  
Integrated Approach ◽  
Point Of View ◽  
Response Functions ◽  
Modal Parameter ◽  
Modal Test ◽  
Multiple Input ◽  
Modal Parameter Estimation ◽  
Sinusoidal Excitation ◽  
Phase Resonance

Abstract Current modal test techniques based on multiple sinusoidal excitation are reviewed. Multiple input stepped sine testing is a phase separation technique. It consists of two steps: the estimation of Frequency Response Functions, followed by modal parameter estimation. Multiple exiter normal mode testing is a phase resonance technique, where the structure is actually forced to vibrate as a pure normal mode. The current paper aims to review and investigate the forcing requirements for both approaches from a global point of view, and to present a new, unifying approach combining several of the advantages of both.

scholarly journals Flutter Test Data Processing Based on Improved Hilbert-Huang Transform

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Hua Zheng ◽  
Junhao Liu ◽  
Shiqiang Duan
Keyword(s):  
Data Processing ◽  
Test Data ◽  
Model Parameters ◽  
Modal Parameter ◽  
Hilbert Huang Transform ◽  
Modal Density ◽  
Flutter Boundary ◽  
Modal Parameter Estimation ◽  
Nonstationary Conditions ◽  
Typical Mode

Flutter tests are conducted primarily for the purpose of modal parameter estimation and flutter boundary prediction, the accuracy of which is severely affected by the acquired data quality, structural modal density, and nonstationary conditions. An improved Hilbert-Huang Transform (HHT) algorithm is presented in this paper which mitigates the typical mode mixing effect via modulation. The algorithm is validated by theory, by numerical simulation, and per actual flight flutter test data. The results show that the proposed method could extract the flutter model parameters and predict the flutter speed more accurately, which is feasible for the current flutter test data processing.

Study on Damage Performance of Oil Storage Tank in the Basis of Modal Test and FEA

2010 ◽  
Vol 163-167 ◽  
pp. 2507-2510
Author(s):  
Guo Feng Du ◽  
Cheng Xiang Xu ◽  
Shan Po Jia
Keyword(s):  
Storage Tank ◽  
Damage Identification ◽  
Single Point ◽  
Physical Parameters ◽  
Modal Parameter ◽  
Tank Model ◽  
Modal Test ◽  
Oil Storage ◽  
Oil Storage Tank ◽  
Foundation Parameters

In order to learn about the dynamic characteristics of the oil storage tank, detect and identify the damaged oil storage tank, based on the basic principle of the experimental modal analysis, the modal test was maken on the vertical dome roof steel oil storage tank model with the hammer method of multi-point input and output on single point, and the identification ability of the modal parameter was studied when the oil storage tank model is damaged. At the same time, we carried out the model's simulation calculation with FEA, considering the effects of the structural physical parameters and the foundation parameters of the oil storage tank. The calculated results of modal test are in accordance with test values, the analysis results provides certain basis for the damage identification and health monitoring work of the oil storage tank structure.

Modal parameter estimation from base excitation

1986 ◽  
Vol 107 (3) ◽  
pp. 435-449 ◽  
Author(s):  
J.-G. Béliveau ◽  
F.R. Vigneron ◽  
Y. Soucy ◽  
S. Draisey
Keyword(s):  
Parameter Estimation ◽  
Base Excitation ◽  
Modal Parameter ◽  
Modal Parameter Estimation
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