Papers by Keyword: LMS Test.Lab

Abstract: At the beginning of this paper, we made some brief introductions on the modal analysis theory. In allusion to the vibration conditions of a medium-sized Bus’s exhaust system, LMS Test.Lab testing software was used and MIMO method was selected to conduct the modal testing. According to the synthesized modal analysis on the X, Y, Z directions of the gauging points, parameters such as the modal frequencies and shapes could be obtained. Then with modal shapes of the first 9 orders, we made some analysis and estimates to the dynamic properties of the exhaust system.

Abstract: In order to reduce vibration and noise of the compressor used in small and medium-sized refrigeration unit, this paper designs different vibration isolating systems and carries out experimental modal analysis based on LMS Test. Lab Impact Testing software. The comparison results of modal parameters of four different vibration isolating systems show that the natural frequency of single-layer vibration isolating system is higher than that of non-isolation system and effectively avoids the second order resonance frequency. Furthermore the natural frequency of double-layer vibration isolating system has reduced due to the additional middle-mass. And the system's natural frequency decreases obviously with the increase of middle-mass which is far from resonance frequency and significantly improve the effect of vibration isolating system.

Abstract: A new method was used to analysis the performance of Nano-MAX lapping machine under working condition. Model analysis in ANSYS and operational model analysis in LMS Test.Lab are banded together properly, which reduce the calculation difficulty. Time frequency analysis method is also used to study in which speed is the most suitable one for processing of Nano-MAX lapping machine. Model analysis results reveal that 100Hz is the natural frequency of chassis and the workbench and 178Hz is the natural frequency of chassis and spindle outer covering. If the exciting frequency is 100Hz or 178Hz, there will be two mechanical parts set up resonance which will likely to cause the whole machine resonance.