**5.1 Piezoelectric active vibration suppression system construction**

Through the above theoretical analysis, to verify the vibration suppression performance of the proposed AHC algorithm in the piezoelectric vibration suppression system, an experimental test system is built, as shown in **Figure 14**. **Figure 14a** shows a single-degree-of-freedom piezoelectric vibration suppression platform, which mainly includes a piezoelectric actuator and a passive suppression unit. The piezoelectric actuator is responsible for active suppression, and the passive vibration isolation unit provides system stiffness. The two ends of the vibration suppression platform are respectively provided with a load mass block and a basic mass block, and the basic mass block relates to the output shaft of the vibration exciter so that the suppression platform can receive external excitation. The whole vibration suppression platform is suspended horizontally by hanging ropes, which can ensure the free boundary conditions and introduce the influence of low stiffness and damping.

**Figure 14b** shows a photograph of the experimental equipment setup integration. The experimental system is mainly divided into a real-time active control system and spectrum test and analysis system. The real-time active control system consists of a charge amplifier, an NI controller, and a piezoelectric driver. The active control process is as follows: The charge amplifier amplifies the feedback signal of the force sensor into

*Active Vibration Suppression Based on Piezoelectric Actuator DOI: http://dx.doi.org/10.5772/intechopen.103725*

**Figure 14.**

*Piezoelectric vibration suppression system: (a) single-degree-of-freedom piezoelectric vibration sup-pression platform; (b) experimental equipment.*

a voltage signal and outputs it to the NI controller. After the real-time active control algorithm in the NI controller, the control signal is generated and output to the piezoelectric driver for real-time active control of the linear piezoelectric actuator.

The spectrum test and analysis system include an LMS spectrum analyzer, an excitation signal output unit and an exciter power amplifier. The spectrum testing and analysis process are as follows: The LMS spectrum analyzer can output the excitation signal that simulates micro-vibration through the built-in simulation signal generator, and simulate the micro-vibration environment of the exciter through the exciter power amplifier. The LMS spectrum analyzer collects the vibration signals of the load platform and the base platform respectively through the acceleration sensor and performs postprocessing and spectrum analysis.
