Vibration reaction force active balancing device for vibration-acceleration test device

Abstract

The present invention discloses a vibration reaction force active balancing device for a vibration-acceleration test device. The vibration-acceleration test device comprises a centrifuge, a vibration table and a balancing weight; the vibration table and a balancing weight are respectively installed at two ends of the pivoted arm of the centrifuge; in the vibration reaction force active balancing device, an excitation electromagnet is fixedly installed at one end of the pivoted arm of the centrifuge and is located at the outer side of the balancing weight; a plurality of control electromagnets is installed at the position having the same height as the excitation electromagnet and is distributed around the rotation virtual circle of the excitation electromagnet; two force sensors are installed on the pivoted arm, signal output ends of the two force sensors are connected with a signal conditioner, a detection controller two power amplifiers in order, and the signal output ends of the two power amplifiers are respectively connected with the excitation electromagnet and the control electromagnets. The vibration reaction force active balancing device for vibration-acceleration test device performs active balance of vibration reacting force generated by a vibration table so as to realize a remarkable force balance effect and achieve the purpose of reducing the vibration of the main shaft of a centrifuge.

Description

technical field [0001] The invention relates to a vibration reaction force balance device, in particular to a vibration reaction force active balance device for vibration-acceleration test equipment. Background technique [0002] The vibration-acceleration test (or "vibration-acceleration comprehensive environmental test") method has a wide range of application requirements and application values ​​in the reliability test of high-speed aircraft and earthquake simulation. Compared with the traditional single test method, the vibration-acceleration test method can more accurately simulate the actual working environment, which is conducive to early detection of potential product failures and risks. [0003] In the current environmental test methods, vibration test and acceleration test are often carried out independently. For high-speed flying devices such as missiles, space shuttles, spacecraft, etc., under accelerated flight conditions, they are subjected to a combination of ...

AI Technical Summary

Problems solved by technology

The passive vibration isolation method has certain disadvantages: 1) Although the vibration transmitted to the main shaft of the centrifuge can be reduced by the vibration isolation device, there is still a residual vibration and shock load, and the main shaft of the centrifuge still bears the effect of the vibration and shock load

2) With the continuous improvement of vibration-acceleration test requirements and the required vibration table thrust, the residual vibration and impact load transmitted to the centrifuge main shaft after vibration isolation by the passive vibration isolation device increases accordingly, making the working environment of the centrifuge main shaft more stable. deterioration

3) The air spring support vibration isolation method is adopted, although the effect is more obvious, but because the natural frequency of the air spring support vibration isolation device is low (less than 5Hz), when the vibration frequency is lower than 5Hz, the air spring support vibration isolation The device will resonate, not only will not produce vibration isolation effect on the vibration reaction force, but will increase the vibration transmitted to the centrifuge main shaft and aggravate the impact on the centrifuge main shaft. Therefore, when the air spring is used to support the vibration isolation, the test frequency It is often higher than 5Hz. When lower frequency vibration is required, the air spring support vibration isolation device needs to be shielded

[0014] The fundamental reason for the above shortcomings is that the traditional vibration isolation technology uses a passive vibration isolation method, which can only weaken the vibration reaction force transmitted to the centrifuge main shaft to a certain extent, but the centrifuge main shaft is always subject to vibration. impact load, but cannot fundamentally balance the bending deformation and overturning effect of the vibration impact load on the main shaft of the centrifuge

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