Calibration shaker system – installation
In the video-lessons, I have seen the shaker system (vibration exciter) placed on a drawer unit. However, as I installed TIRA 51120 on the office desk it started buzzing and shaking at low frequencies (the shaker system has rubber legs). What kind of foundation would you recommend for similar compact shaker system?
Newton’s third law says that for every action there is an equal reaction. The force used by the shaker system to impact the tested specimen is also applied to the shaker system itself. However, the shaker system is much heavier than the tested object is, hence, shaker system vibration has a small amplitude. As a result, the shaker system also causes vibration of the table upon which it is installed.
The usual office desk has a cross-panel installed close to one of the sides. This leads to a low frequency of intrinsic oscillations (buzzing) and antinodal point formation in the middle of the desk (the wave has a peak displacement amplitude value at this point). So, if we install the shaker system in the middle of the desk, the resonance frequency will cause desk oscillation. That is why we placed the shaker system (vibration exciter) upon a drawer unit – the drawer unit table board is smaller than that of a table, hence, its intrinsic frequency will be higher. In our case we also had a resonance of the small cabinet at the frequency of 24-27 Hz – the pens start to roll, objects inside of the drawer unit move, but the displacement amplitude range is low, so it is almost invisible.
The best shaker system foundation is a solid-cast concrete cube with a shaker system foundation attached to it. In the office or laboratory environment, the shaker system should be placed on the floor and to have rubber legs. It is not comfortable to work on the same floor with the shaker system, so the best option is to place the shaker system on a drawer unit (made of thick boards – the thicker – the better) without any shelves.