Introduction of vibration test bench, electric vibration bench

Introduction of vibration test bench the principle of vibration bench the working principle of electric vibration test system is similar to loudspeaker That is to say, the electrified conductor moves under the action of electromagnetic force in the magnetic field When the moving coil in the magnetic circuit of the vibration table passes through the alternating current signal, it will generate the excitation force in the magnetic circuit, which is the vibration motion Vibration table terminology ◎ frequency range: the frequency range specified by Zui large displacement and Zui large acceleration under the rated excitation force of the vibration test system Rated thrust: the force that can be generated by the vibration test system (unit: n); the force is specified as the root mean square value in random vibration Large displacement of Zui: the large displacement of Zui generated by the vibration test system This value is limited by the mechanical operation of the vibration table, and is usually expressed in terms of double amplitude (unit: m m p-p.) ◎ Zui high acceleration: the value of Zui high acceleration that can be generated by the vibration test system under no-load condition (unit: M / S2) ◎ Zui high speed: the value of Zui high speed generated by the vibration test system (unit: M / S2) Large load: large load weight of Zui on the vibration table (unit: kg) ◎ moving parts: the moving parts of the electric vibration table are a moving system composed of table, moving ring (including framework), suspension connection of moving ring, flexible support, electrical connection and cooling connection Allowable eccentric moment: the value of Zui large eccentric moment allowed by the vibration table guide system There are two ways to test the vibration table: one is frequency sweep test, according to the frequency specified in the test, use the sweep method to constantly change the excitation frequency; the other is constant frequency test The purpose of sinusoidal vibration is to simulate the vibration and influence of electrical and electronic products in the process of transportation, storage and use in the laboratory, and to assess their adaptability For example, according to IEC (International Electrotechnical Commission Standard), GB / t2423, mil-810, GJB150, etc., the frequency sweep test is carried out on the test piece, or the continuous frequency determination test of resident resonance point is adopted.