Lan Qin

Active Design Method for the Static Characteristics of a Piezoelectric Six-Axis Force/Torque Sensor

To address the bottleneck issues of an elastic-style six-axis force/torque sensor (six-axis force sensor), this work proposes a no-elastic piezoelectric six-axis force sensor. The operating principle of the piezoelectric six-axis force sensor is analyzed, and a structural model is constructed. The static-active design theory of the piezoelectric six-axis force sensor is established, including a static analytical/mathematical model and numerical simulation model (finite element model). A piezoelectric six-axis force sensor experimental prototype is developed according to the analytical mathematical model and numerical simulation model, and selected static characteristic parameters (including sensitivity, isotropic degree and cross-coupling) are tested using this model with three approaches. The measured results are in agreement with the analytical results from the static-active design method. Therefore, this study has successfully established a foundation for further research into the piezoelectric multi-axis force sensor and an overall design approach based on static characteristics.

Principle Research on a Single Mass Piezoelectric Six-Degrees-of-Freedom Accelerometer

A signal mass piezoelectric six-degrees-of-freedom (six-DOF) accelerometer is put forward in response to the need for health monitoring of the dynamic vibration characteristics of high grade digitally controlled machine tools. The operating principle of the piezoelectric six-degrees-of-freedom accelerometer is analyzed, and its structure model is constructed. The numerical simulation model (finite element model) of the six axis accelerometer is established. Piezoelectric quartz is chosen for the acceleration sensing element and conversion element, and its static sensitivity, static coupling interference and dynamic natural frequency, dynamic cross coupling are analyzed by ANSYS software. Research results show that the piezoelectric six-DOF accelerometer has advantages of simple and rational structure, correct sensing principle and mathematic model, good linearity, high rigidity, and theoretical natural frequency is more than 25 kHz, no nonlinear cross coupling and no complex decoupling work.

Principle Research on a Novel Piezoelectric 12-DOF Force/Acceleration Sensor

This study proposes a new piezoelectric 12-DOF force/acceleration sensor structure to measure forces, torques, and accelerations, during a robot’s space motion. The study involves analyzing the operating principle and structural characteristics in order to obtain the model structure of a sensor. The mechanical diagram of the sensor was drawn based on the structural parameters of a piezoelectric 12-DOF force/acceleration sensor, and a numerical simulation model was established. The sensor utilizes piezoelectric quartz, of different cutting types, as the sensing and conversion element. Additionally, ANSYS was used to study the static sensitivity, crossing couplings, natural frequency, and other characteristics. The research results indicate that the piezoelectric 12-DOF force/acceleration sensor has many advantages, which include a simple structure, high integration, good linearity, and dynamic characteristics. The sensor’s operating principle is accurate, and the crossing couplings correspond to linear coupling. The results of the static characteristic analysis are consistent with the structural model. The natural frequencies exceed 11 kHz, and the relative errors of output data are less than 1%, with respect to the decoupling calculation.