Three-stage Stewart mechanism parallel configuration six-degree-of-freedom vibration excitation system

Abstract

The invention discloses a three-stage Stewart mechanism parallel configuration six-degree-of-freedom vibration excitation system, which adopts a three-stage Stewart mechanism six-degree-of-freedom parallel configuration and comprises eighteen actuator branches, a plurality of air spring branches, a plurality of auxiliary support branches, an upper platform assembly, a lower platform assembly and areal-time control hardware system; the upper platform assembly and the lower platform assembly are connected through the eighteen actuator branches, the air spring branches and the auxiliary supporting branches. Each actuator branch is composed of a linear moving magnet type motor, a hinge assembly and an adapter. Each air spring branch is composed of an air spring and an adapter; each auxiliarysupporting branch is composed of a threaded lead screw lifter and an adapter piece. The real-time control hardware system obtains six-degree-of-freedom displacement and acceleration signals of the upper platform collected by the sensor through A / D sampling, and calculates a control signal; a control signal is output to the power amplifier through the D / A, the actuator is driven to output axial motion, and the upper platform is pushed to generate an expected six-degree-of-freedom vibration excitation signal.

Description

technical field [0001] The invention belongs to the field of vibration control of intelligent parallel mechanisms, in particular to a three-stage Stewart mechanism parallel configuration six-degree-of-freedom vibration excitation system, which can be used to simulate vibration signals received by precision instruments in various environments. Background technique [0002] High-precision loads, precision instruments, etc. are inevitably disturbed by mechanical vibration from the carrier itself or the outside world during the execution of tasks, and present the characteristics of multi-degree-of-freedom line-angle vibration coupling, high-frequency and low-frequency vibration coexistence, etc., which greatly affect Therefore, it is of great engineering significance to test the working state of the equipment under the multi-degree-of-freedom complex vibration interference and to debug it in the laboratory (inner field) environment. [0003] The typical equipment used to provide...

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to propose a new six-degree-of-freedom vibration excitation system for a single-degree-of-freedom vibration table that is difficult to meet the test requirements of multi-degree-of-freedom vibration simulation, which can be used to simultaneously simulate vibration signals with up to six degrees of freedom. Provide multi-degree-of-freedom vibration excitations for test pieces (high-precision loads, precision instruments, etc.) Control accuracy, or perform functional performance testing and calibration, etc.

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