scholarly journals Vibration Analysis of the Drivetrain in Dependence on the Type of Gearbox Suspension Bushing

2021 ◽  
Vol 71 (1) ◽  
pp. 121-130
Author(s):  
Struz Jiri ◽  
Hruzik Lukas ◽  
Havlik Jiri
Keyword(s):  
Modal Analysis ◽  
Analytical Method ◽  
Vibration Analysis ◽  
Great Distance ◽  
Experimental Modal Analysis ◽  
Main Subject ◽  
Shaft Length ◽  
Heavy Truck ◽  
Different Parts ◽  
Fft Analysis

Abstract In the vast majority of technical applications, there is a necessity to transmit the torque from drive to driven machine together with the demand to overcome great distance between given devices. One of the solutions of this problem is the use of a cardan shaft. Operations of connecting shaft and drivetrain are accompanied by oscillations negatively influencing the driver comfort. Main subject of this article is the measurement of vibrations on different parts of a heavy truck and its evaluation by FFT analysis. Measurements are performed with two kinds of suspension bushing which are compared with to each other. Based on the previous measuring, influence of cardan shaft length was also investigated. First of all, dependency on the length of the cardan shaft on deflection angles for V arrangement was evaluated by analytical method. The theoretical introduction is followed by research of eigen frequency depending on the length of the cardan shaft. The results obtained by modal analysis in FEM are verified by experimental modal analysis [1].

The Use of Modan 3D in Experimental Modal Analysis

2013 ◽  
Vol 486 ◽  
pp. 36-41 ◽  
Author(s):  
Róbert Huňady ◽  
František Trebuňa ◽  
Martin Hagara ◽  
Martin Schrötter
Keyword(s):  
Modal Analysis ◽  
Vibration Analysis ◽  
High Speed ◽  
Mechanical Vibration ◽  
Steel Sample ◽  
Experimental Modal Analysis ◽  
Image Correlation ◽  
Optical Methods ◽  
Mode Shapes ◽  
Vibration Modes

Experimental modal analysis is a relatively young part of dynamics, which deals with the vibration modes identification of machines or their parts. Its development has started since the beginning of the eighties, when the computers hardware equipment has improved and the fast Fourier transform (FFT) could be used for the results determination. Nowadays it provides an uncountable set of vibration analysis possibilities starting with conventional contact transducers of acceleration and ending with modern noncontact optical methods. In this contribution we mention the use of high-speed digital image correlation by experimental determination of mode shapes and modal frequencies. The aim of our work is to create a program application called Modan 3D enabling the performing of experimental modal analysis and operational modal analysis. In this paper the experimental modal analysis of a thin steel sample performed with Q-450 Dantec Dynamics is described. In Modan 3D the experiment data were processed and the vibration modes were determined. The reached results were verified by PULSE modulus specialized for mechanical vibration analysis.

scholarly journals Experimental Modal Analysis by Base Excitation (Vibration Analysis of ADE)

2005 ◽  
Vol 71 (712) ◽  
pp. 3388-3395 ◽  
Author(s):  
Takashi SHINOHARA ◽  
Yusuke KOBAYASHI ◽  
Aiguo MING ◽  
Takashi KIDA ◽  
Susumu IIZUKA ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Vibration Analysis ◽  
Experimental Modal Analysis ◽  
Base Excitation

Experimental Modal and Vibration Analysis of High-Speed Industrial Sewing Machine

2013 ◽  
Vol 711 ◽  
pp. 363-366
Author(s):  
Li Zhang ◽  
Hong Wu
Keyword(s):  
Modal Analysis ◽  
Vibration Analysis ◽  
High Speed ◽  
Experimental Modal Analysis ◽  
Vibration Exciter ◽  
Operating Speed ◽  
Sewing Machine

With the vibration exciter, the experimental modal analysis and vibration analysis of high-speed industrial sewing machine was carried out in this paper. The results show that the sewing machine will be of resonance at the operating speed of 4000r/min, which means the structure of the chassis of the sewing machine should be optimized.

AN Identification Method of Damping Matrix for Frame Structures

2011 ◽  
Vol 243-249 ◽  
pp. 967-970
Author(s):  
Sha Sha Dong ◽  
Wei Ying Wang ◽  
Fu Shun Liu ◽  
Zhi Qiang Gao
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristic ◽  
Experimental Modal Analysis ◽  
Frame Structure ◽  
Frame Structures ◽  
Order Complex ◽  
Identification Method ◽  
Damping Matrix ◽  
Complex Modes ◽  
Different Parts

Nowadays, damping is still the important dynamic characteristic that is the least understood and the most difficult to quantify. The advantage of the proposed damping matrix identification method is that several low order complex modes achieved by Experimental Modal Analysis (EMA) are capable of calculation precision. In order to identify the damping matrix, this paper also proposes a general damping matrix decompositon technique, which can be used in the situation that different parts of the structure have different damping. Then a five-story frame structure is applied to demonstrate the proposed method ,and the results obtained show the suitability of this approach for damping matrix identification in frame structures.

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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