研究目的
Investigating the influence of piezoelectric actuation in stepped beam on buckling critical load and linear frequency.
研究成果
The study demonstrates that piezoelectric actuation can significantly enhance the critical buckling force and alter the first natural vibration frequency of stepped beams with various end supports. The effectiveness of control depends on the system's supports, piezosegment geometry, and the relation of piezoelectric properties to the host beam. The widest range of control is achieved with pinned-pinned supports, while the narrowest is with clamped-clamped supports. Further research and experimental tests are recommended to explore additional configurations and practical applications.
研究不足
The study is limited to theoretical and numerical analysis without experimental validation. The practical application may be constrained by the maximum allowable voltage to avoid depolarization of piezoelectric elements.
1：Experimental Design and Method Selection:
The study involves the analysis of a system composed of a host beam with piezoelectric patches bonded to its top and bottom surfaces. The system is subjected to kinematic loading through prescribed displacement of one or both end supports. Three different beam end supports are considered: clamped-clamped, clamped-pinned, and pinned-pinned. The effect of electric field direction on the piezoelectric patches is analyzed to induce in-plane stretching or compressive residual force.
2：Sample Selection and Data Sources:
The beam is made of homogeneous, elastic isotropic aluminium material, and the piezoelectric patches are made of homogeneous, elastic, transversely isotropic P41 material.
3：List of Experimental Equipment and Materials:
Piezoelectric patches (P41 material), host beam (aluminium material), equipment for applying electric field and measuring displacements and vibrations.
4：Experimental Procedures and Operational Workflow:
The beam is loaded via prescribed displacement of one of the supports. The electric field is applied to the piezoelectric patches to induce axial compressive or tensile force. The system's response in terms of stability and vibrations is analyzed.
5：Data Analysis Methods:
The study uses non-dimensional governing equations for stability and vibrations problems, with solutions obtained through separation of variables and numerical methods.
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