|Precaution to Be taken during Random vibration testing

Vibration jig Platform Fixture:
Vibration jigs are specially designed as per the profile requirement for UUT. It plays critical role during random vibration testing mode. It must transfer uniform level of vibration effect on UUT and this effect can be monitored by using vibration sensors placed on jig platform.
Sensors Mounting:
Use good quality monitoring sensors to see the misalignment between applied input profile and profile presented on the surface of the jig. Fig. 10 shows misalignment between input and output feedback profile (which was monitored by sensors).There are many reasons for such type of errors i.e. Improper fixing of jig on vibration actuator, use of incorrect profile of jig, and loose mounting of sensors. After making the appropriate changes in setup the output profile will follow the input profile curve as shown in Fig. 11.