An integrated experimental system for modal testing and active control of piezoelectric fiber beam with variable boundary conditions

The modular experimental system enables rapid switching between various working conditions, such as cantilever beams and fixed beams, solving the problem of limited boundary conditions in existing experimental platforms, improving the versatility and ease of operation of the experimental platform, and achieving efficient active vibration reduction.

CN122306344APending Publication Date: 2026-06-30CHANGAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGAN UNIV
Filing Date
2026-04-09
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The existing experimental platform has a single type of boundary condition, making it difficult to quickly switch between various working conditions such as cantilever beams and fixed beams on the same platform. In addition, its functions are relatively limited and it cannot be flexibly adjusted for experimental objects of different lengths and clamping positions.

Method used

The integrated experimental system for modal testing and active control of piezoelectric fiber beams with variable boundary conditions achieves rapid switching between various working conditions, such as cantilever beams and fixed beams, through the modular combination of base, sliding support arm and special fixture, combined with piezoelectric fiber sheet, sensor and host computer control circuit. The system also achieves stepless sliding and precise locking of the support arm on the base chassis through the cooperation of the profile's built-in sliding groove, T-screw and fixing angle steel.

Benefits of technology

The system enables rapid switching between various operating conditions on the same platform, improving the spatial versatility and ease of operation of the experimental platform, ensuring the ideal reproduction of experimental boundary conditions, improving active actuation and sensing efficiency, accurately extracting natural frequencies of each order, providing high-fidelity basic data for subsequent control algorithms, and achieving efficient active vibration reduction.

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Abstract

This invention discloses an integrated experimental system for modal testing and active control of piezoelectric fiber beams with variable boundary conditions, comprising a base chassis; two support arms connected to the base chassis; the ends of the support arms are vertically slidably connected to the base chassis; two profiles of a fixed angle steel are respectively connected to the base chassis and the support arms; clamps are connected to the support arms, and the clamps hold the experimental beam; piezoelectric fiber sheets are attached to the surface of the experimental beam, and the piezoelectric fiber sheets are sequentially connected to a voltage amplifier, a DA output card, and a host computer; laser displacement sensors are distributed opposite to the experimental beam, and the laser displacement sensors are sequentially connected to an AD acquisition card and the host computer. This system solves the problem that conventional experimental platforms have limited boundary conditions, making it difficult to quickly switch between various working conditions such as cantilever beams and fixed beams on the same platform.
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