Six-freedom vibration excitation system

Abstract

The invention discloses a six-freedom vibration excitation system. The six-freedom vibration excitation system is composed of a mechanical structure subsystem, an air floating support subsystem and an electric control hardware subsystem. The mechanical structure subsystem comprises an upper platform, a lower platform and six motion branched chains, wherein each motion branched chain is composed of a two-freedom hook joint, a three-freedom hook joint and a voice coil motor actuator. The air floating support subsystem comprises air spring elements, thread screw elevators and a corresponding pneumatic control loop, for offsetting the gravity of a load in case of motion and non-motion conditions of the six-freedom vibration excitation system. The electric control hardware subsystem comprises sensors, signal conditioners, a control computer, a D / A board, an A / D board and a power amplifier, for controlling the six-freedom vibration excitation system. The six-freedom vibration excitation system has the following advantages: multi-freedom high-precision small-magnitude vibration excitation (including sine, frequency sweep and random vibration) under various conditions is provided for correlation precision instruments in the field of a spaceflight technology, and an on-orbit vibration environment is simulated and the instrument reliability is examined in a laboratory environment.

Description

technical field [0001] The invention belongs to the field of precision machinery, and in particular relates to a six-degree-of-freedom vibration excitation system. Background technique [0002] Some active components such as the engine on the spacecraft will vibrate, which will affect the accuracy of precision instruments and even cause the instruments to fail to work properly. Therefore, it is necessary to simulate the vibration environment in the ground environment before launching, and study the relationship between the vibration magnitude and the working accuracy of the instrument. [0003] A typical piece of equipment used to study the effects of vibration is an excitation table. At present, the single-degree-of-freedom vibration table has been widely used, but the single-degree-of-freedom vibration table can only simulate the vibration environment in a single direction. With the advancement of engineering technology and the increasing demand of people, the single-degr...

AI Technical Summary

Problems solved by technology

At present, the single-degree-of-freedom vibration table has been widely used, but the single-degree-of-freedom vibration table can only simulate the vibration environment in a single direction. With the advancement of engineering technology and the increasing demand of people, the single-degree-of-freedom To meet engineering needs, there is an urgent need to develop a multi-degree-of-freedom excitation system

At present, the multi-degree-of-freedom excitation system is rarely used in various engineering fields. In the field of aerospace on-orbit environment simulation, a single-degree-of-freedom excitation table is still used for rough simulation of the vibration environment.

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