Fundamental comparison of time-domain experimental modal analysis methods based on high- and first-order matrix models

2014 ◽  
Vol 333 (25) ◽  
pp. 6869-6884 ◽  
Author(s):  
Sau-Lon James Hu ◽  
Wen-Long Yang ◽  
Fu-Shun Liu ◽  
Hua-Jun Li
Keyword(s):  
Matrix Models ◽  
Modal Analysis ◽  
Time Domain ◽  
Experimental Modal Analysis ◽  
First Order ◽  
Order Matrix ◽  
Analysis Methods

Experimental Modal Analysis of Motorized Spindle Based on Stochastic Subspace Identification

2011 ◽  
Vol 103 ◽  
pp. 469-474
Author(s):  
Jie Meng ◽  
Xiao An Chen
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Time Domain ◽  
Experimental Modal Analysis ◽  
Modal Parameters ◽  
Vibration Velocity ◽  
Subspace Identification ◽  
Motorized Spindle ◽  
Stochastic Subspace Identification ◽  
The Time Domain

Experimental modal analysis is done to the grinding motorized spindle under 36000r/min. The corresponding theory and experimental plan are introduced. The time domain waveform is gained and the maximum vibration velocity is worked out. Stochastic Subspace Identification (SSI) is applied to study dynamic characteristics of motorized spindle which is running idle, then modal parameters are extracted. The correctness of the experimental method is validated, which has certain referential importance.

Experimental Modal Analysis of Vehicle Body in White

2012 ◽  
Vol 226-228 ◽  
pp. 431-435
Author(s):  
Shu Ming Chen ◽  
Chuan Liang Shen ◽  
Xue Wei Song ◽  
Deng Feng Wang ◽  
Wei Li
Keyword(s):  
Modal Analysis ◽  
Basic Principle ◽  
Vibration Characteristics ◽  
Experimental Modal Analysis ◽  
Vehicle Body ◽  
Test Results ◽  
First Order ◽  
Car Body ◽  
Vibrational Characteristics ◽  
Body In White

In order to know the vibration characteristics of the vehicle body in white, the experimental modal analysis was performed by using LMS modal equipment. The basic principle of experimental modal analysis was introduced. Then, the first ten order modes were obtained within 100 Hz. The front several main modes were analyzed. The test results fully show that the car body in white has excellent first order torsional, bending and overall vibrational characteristics.

Modal analysis methods – time domain

2001 ◽  
pp. 180-197 ◽  
Author(s):  
Jimin He ◽  
Zhi-Fang Fu
Keyword(s):  
Modal Analysis ◽  
Time Domain ◽  
Analysis Methods

Effect of Bass Bar Tension on Modal Parameters of a Violin's Top Plate

2015 ◽  
Vol 39 (1) ◽  
pp. 145-149 ◽  
Author(s):  
Ewa B. Skrodzka ◽  
Bogumił B.J. Linde ◽  
Antoni Krupa
Keyword(s):  
Modal Analysis ◽  
Experimental Modal Analysis ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Normal Value ◽  
Modal Damping

Abstract Experimental modal analysis of a violin with three different tensions of a bass bar has been performed. The bass bar tension is the only intentionally introduced modification of the instrument. The aim of the study was to find differences and similarities between top plate modal parameters determined by a bass bar perfectly fitting the shape of the top plate, the bass bar with a tension usually applied by luthiers (normal), and the tension higher than the normal value. In the modal analysis four signature modes are taken into account. Bass bar tension does not change the sequence of mode shapes. Changes in modal damping are insignificant. An increase in bass bar tension causes an increase in modal frequencies A0 and B(1+) and does not change the frequencies of modes CBR and B(1-).

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