When evaluating the vibration and noise characteristics of a structure, useful dynamic characteristics can be obtained by exciting the actual input point under operating conditions.
Impact hammers and electromagnetic shakers are commonly used to characterize a structure’s dynamics.
However, the excitation points for vehicle engines and transmissions are usually inside of block or housing, making conventional excitation methods difficult to apply.
In such cases, excitation using compact piezoelectric elements is effective.
For an engine, exciting the journal —an input point to the case for combustion excitation force— using a piezoelectric element makes it possible to obtain dynamic characteristics under conditions equivalent to exciting the actual excite point.
In addition, synchronized multi-point excitation measurements that leverage the high repeatability of excitation tests enable detailed understanding of vibration behavior and clarification of sound-radiating locations using acoustic intensity.
