Electromechanical Shaker: Basic Elements and Parameters for Selection

How to calculate the additional vibration force (thrust) is a key problem when selecting a suitable electromechanical shaker. If the thrust is insufficient, the shaker may be overloaded, resulting in damage to the power amplifier or moving coil; However, too much thrust will cause a waste of resources and lack of economy. Therefore, for newcomers to the industry, choosing the right electrodynamic shaker table is an essential skill. What parameters should be considered when selecting a model? The following will explain in detail.

Electromechanical shaker vertical vibration selection parameters

• F (added vibration force) = Σm (total mass) ×A (acceleration)
• F: necessary vibration force [N]A: test maximum acceleration (m/s2)
• m1: Shaking table moving coil mass (kg)
• m2: Vertical expansion station mass (kg) (sometimes not in use)
• m3: Mass of test body and fixture (kg)Σm = m1 + m2 + m3 (kg)

For example: sinusoidal constant frequency test conditions:

• Frequency 10Hz, acceleration: 10G (1G-9.8m/s2)
• Weight of test body and fixture m3:40kg
• Now the electrodynamic shaker table ES-40-370 [maximum sinusoidal vibration force 40kN] moving coil mass 45kg, vertical expansion platform ES-20 (mass 30kg, resonance point 600Hz) is used, and the vibration force required at this time.
• F= (40+45+30) x10×9.8 = 11270 [N] = 11.27[kN]
• After the safety factor is 1.2, 11.27×1.2= 13.524[kN] < 40 [kN]

40kN electrodynamic shaker table ES-250 vertical direction can be corresponding.

• F(added vibration force) = 2m (total mass)xA (acceleration)
• m1: Shaking table moving ring mass + horizontal sliding table mass + connector (cow head) mass (kg)
• m2: Mass of test body and fixture (kg)

Example: sinusoidal constant frequency test condition:

Frequency 10Hz, acceleration 10G (1G=9.8m/s2);m2 mass 40kg(i.e. vertical m3);At present, only ES-40-445 hydrostatic bearing horizontal platform V0404 is used in the laboratory, with a mass of 100kg and a resonance point of 1600Hz. Maximum sinusoidal vibration force 40kN At this time, the required vibration force F= (100+40) x10×9.8=13720[N]=13.72[kN] Safety factor 1.2 used, 13.72×1.2=16.464[kN]<40kN.

40kN electromechanical Shaker J250 horizontal slide table horizontal direction can be corresponding.

Summary

When the vibration force is insufficient, it is necessary to select a electromechanical shaker with a larger vibration force and recalculate it according to the parameters of the existing equipment. If the vibration force is too large, a electrodynamic shaker table with a small vibration force should be selected, and relevant parameters also need to be recalculated to achieve cost optimization. After calculating the vibration force, combined with the displacement, speed, acceleration and frequency range of indicators, the most suitable electrodynamic shaker table can be preliminarily determined. The calculation of the added vibration force is the basic method to ensure the safe operation of the equipment, so it is important to keep this in mind!