A. What is the Electromagnetic Vibration Test Bench

Vibration test system is mainly used for products vibration and shock environment test, environmental stress screening test, reliability test. 

In the laboratory, with the aid of vibration testing system, simulations of reproduction of sinusoidal, random, resonant search and dwell, classical shock and road models, etc. can be achieved. It is essential for product quality assurance, new product research and development.

Electromagnetic vibration tester completely according to the standard of battery related testing design, simulation under the certain condition of the vibration test of battery, the battery or battery pack is fixed on the vibration table, according to the prescribed frequency, acceleration and displacement mode along the battery sample vibration of three mutually perpendicular direction measured battery should not leak, don't lose heart, not broken, no fire and explosion. 

Vibration test of the application scope is extremely broad, from circuit board, battery, plane, ship, rocket, missile, cars and home appliances and other industrial products.

A complete set of vibration testing system is composed of shaker, power amplifier and vibration measuring control system, in accordance with the relevant national and international standards (such as: MIL-STD, DIN, ISO, ASTM, IEC, ISTA, GB, GJB, JIS, BS, etc.) to provide technical support for establishing product quality inspection.

B. The Working Principle of Vibration Exciter

The Working Principle of the electromagnetic vibration exciter is similar to a loudspeaker whereby electrical conductor ismoved by
the action of electromagnetic force in the magnetic field.The force to accelerate the moving part is generated by thebalance between driving current and magnetic flux.Therefore,by controlling the driving current,one can control of thevibration generator.

The maximum acceleration level of the electromagnetic vibration exciter is determined by the maximum current and theload,At low frequency,displacement of moving part will limitation and the acceleration will not reach high level,The resonance frequency of the moving element is set higher than the upper limit of the frequency range.

Selection formula and vibration generator structure

Test type: sinusoidal vibration; random vibration

Frequency range: 2-4000Hz

Formula: A(g)=(2πf)2Dcm/980≒A=0.002DmmF2 D=A/0.002F2

F=M(kg) ×A(g)

C. Vibration test Feature

1. Electromagnetic Vibration Test Bench LCD computer control, easy operation.
2. Load center airbag with high static stiffness and low dynamic stiffness, strong carrying capacity, perfect performance on amplitude variation.
3. Even vibration, easy to adjust amplitude, predicate amplitude.
4. Large amplitude adjustment range, low noise.
5. Rugged suspension system and linear motion guiding, strong carrying capacity, good guiding functions, high stability.
6. Human engineering design.
7. High efficiency D class power switching, 3-sigma peak current, low power consumption and minimum harmonic distortion.
8. Fixed frequency, sweep frequency and multistage random test function.
9. Airbag shock isolation device for vibration platform without the need of additional. foundation, perfect reproduction of vibrational wave and reduction in vibration transmittance.
10. Quick self-diagnosis with safety interlock, high safety reliability.
11. Horizontal and vertical expansion platforms for different applications.
12. Simple controller operation.

D. Test requirements
To choose a suitable vibration test system,the most important thing is to know the exciting force required to perform thevibration test.To evaluate and calculate the exciting force,the following test specifications should be known:
1. Clear Testing Requirements
2. Maximum Displacement
3. Frequency ( Frequency Range)-Maximum Velocity
4. Maximum Acceleration
5. Specimen Mass and Fixation
6. The specimen fixation is selected based on the upper limit of test frequency and specimen size,either vertical expansionplatform or horizontal slip table,Specimen mass is needed to evaluate the required exciting force for vibration test