Engine mounts are used in the automotive industry to ensure a high degree of ride comfort within the cabin. The mounts reduce vibration to the car body by absorbing the static and dynamic forces generated by the engine. The vibration transmission characteristics of the mounts, in particular the dynamic stiffness, are of key importance to noise and vibration engineers. There is an increasing demand, particularly in hybrid and electric vehicles, for higher test frequencies.
m+p international’s turnkey vibration test rig allows to investigate dynamic stiffness and loss factor of engine mounts in a frequency range from 50 to 3,000 Hz. The purpose of these high-frequency test rigs is to characterize elastomers, elastomer-metal engine mounts, hydro-mounts, active and passive bearings dynamically using a static preload. The preload is 0 to 5,000 N.
The concept is based on an electrodynamic shaker including power amplifier which can be operated in different test modes defined in the m+p VibControl vibration control software. Shaker, specimen, sensors and seismic mass are vibration-isolated.
Instead of an electrodynamic shaker, the high-frequency test rig can also be equipped with a piezoelectric actuator.
The supplied vibration control system is a standard product and consists of the m+p VibControl software and the m+p VibRunner acquisition hardware featuring, for example, 16 input channels. All settings and measurements are written into a result file; these files can be analyzed directly on completion of the test, or used for later analysis, data export, or to generate reports.