Ultra-low frequency modal test suspension system

Abstract

The invention discloses an ultra-low frequency modal test suspension system, comprising a modal test suspension device and a monitoring computer for realizing remote detection and monitoring. The monitoring computer is connected with an Ethernet router; an air tank and a pneumatic actuator are connected with an air pressure control MPU (Microprocessor Unit); a suspension follower is connected with a linear displacement coder, a suspension force sensor and an electromagnetic force sensor; an electromagnetic actuator is connected with a power amplifier; the linear displacement coder is connected with a CPLD (Complex Programable Logic Device) processing module which is connected with an electromagnetic force control MPU; the suspension force sensor and the electromagnetic force sensor are connected with the electromagnetic force control MPU; the air pressure control MPU and the electromagnetic force control MPU are both connected with a modal suspension control MPU; and the modal suspension control MPU is connected with the Ethernet controller which is connected with the Ethernet. The invention realizes fully digital control, improves the work efficiency, improves the control precision and reduces the influence of the accessories on the modal test.

Description

technical field [0001] The invention relates to a special suspension system for ultra-low frequency modal test. Background technique [0002] The dynamic test of low-frequency or ultra-low-frequency structural parts in a simulated weightless environment requires special suspension devices. The suspension device has the following properties: a wide range of allowable mass of the suspension specimen; extremely low stiffness; low additional mass impact; pieces. Generally, multiple suspension devices are used to hang the same specimen. When the length of the suspension cable is appropriate, the pendulum effect is formed. The horizontal direction is only subject to flexible constraints. [0003] A major feature of the space environment is weightlessness. This leads to the classic problem of dynamic testing of structural members in a simulated weightless environment. The weight of the specimen must be balanced by the suspension forces without introducing significant dynamic ...

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the shortcomings of the existing modal test suspension system using analog circuits, lower operating frequency, low control precision, and greater influence of additional components on modal tests, the present invention provides an all-digital control, improved operating frequency, Ultra-low frequency modal test suspension system that improves control accuracy and reduces the influence of additional components on modal tests

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