研究目的
To investigate the design and analysis of a novel piezoelectric actuator that uses a piezoelectric cantilever beam with a loading spring to produce displacement outputs, aiming to exploit nonlinear phenomena to improve displacement effectiveness at lower voltages.
研究成果
The preloaded piezoelectric actuator significantly amplifies tip displacement outputs, with up to six times improvement compared to non-pretensioned actuators, particularly near the critical buckling pretension. The model accurately predicts key characteristics like resonant frequency and bifurcation. The pre-buckled configuration is most practical due to stable performance, but post-buckled cases offer higher amplification at the cost of instability. Optimal performance depends on matching driving voltage and pretension.
研究不足
The model neglects the effects of very thin silver conducting electrodes and epoxy adhesive layers, which may cause deviations. The system's performance is sensitive to pretension and driving voltage, and optimal configurations require careful tuning. The study focuses on the first mode of vibration, potentially overlooking higher modes.
1：Experimental Design and Method Selection:
The study involves analytical modeling using Lagrangian functional and Euler–Lagrange equations, numerical simulation with MATLAB, and experimental validation. The system is designed as a bimorph piezoelectric cantilever beam with a loading spring to create nonlinear behavior.
2：Sample Selection and Data Sources:
The experimental device uses a bimorph piezoelectric cantilever beam with specific parameters (e.g., length 120 mm, width 20 mm) and a loading spring with adjustable pretension. Data on tip displacement are collected using a laser displacement sensor.
3：List of Experimental Equipment and Materials:
Equipment includes a laser displacement sensor (Keyence LK-H020), DC power supply (MS2-H50), converter (Keyence LK-G5001V), digital micrometer caliper, and the piezoelectric actuator setup with bimorph beam and loading springs.
4：Experimental Procedures and Operational Workflow:
The actuator is driven by a voltage applied to the piezoelectric electrodes. The pretension of the loading spring is varied using a micrometer caliper. Tip displacements are measured across a frequency range (1-30 Hz) at a constant voltage amplitude (e.g., 10 V), and data are recorded and analyzed.
5：Data Analysis Methods:
Numerical simulations in MATLAB are used to predict responses, and experimental data are compared with simulations to validate the model. Amplification coefficients and frequency responses are analyzed.
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