Shupeng Wang

Design, analysis and experimental performance of a stepping type piezoelectric linear actuator based on compliant foot driving

A stepping type piezoelectric linear actuator based on compliant foot driving is proposed in this paper. With the help of four piezo-stacks and four compliant feet, the designed actuator can produce large range linear motions in both positive and negative directions with high accuracy. The mechanical structure and the operating principle are discussed. Mohr integration method is used to analyze the deformation of the key component compliant foot. To investigate the working performance, a prototype is fabricated and a series of experiments are carried out. The experimental results indicate that the displacement outputs under various driving voltages and various driving frequencies show good linear relationships with the time. The driving resolution and the maximum output force are 10.98 nm and 43 N, respectively. The displacements deviation between the forward and backward motions within 30 steps is 6.82 μm and the amplitude of the parasitic motions is about 0.638 μm. The experimental results also confirm that the designed actuator can achieve various speeds by changing the driving voltage and driving frequency.

Design, Analysis and Experimental Performance of a Bionic Piezoelectric Rotary Actuator

This study presents a piezoelectric rotary actuator which is equipped with a bionic driving mechanism imitating the cen-tipede foot. The configuration and the operational principle are introduced in detail. The movement model is established to analyze the motion of the actuator. We establish a set of experimental system and corresponding experiments are conducted to evaluate the characteristics of the prototype. The results indicate that the prototype can be operated stably step by step and all steps have high reproducibility. The driving resolutions in forward and backward motions are 2.31 μrad and 1.83 μrad, respec-tively. The prototype can also output a relatively accurate circular motion and the maximum output torques in forward and backward directions are 76.4 Nmm and 70.6 Nmm, respectively. Under driving frequency of 1 Hz, the maximum angular ve-locities in forward and backward directions are 1029.3 μrad⊙s-1 and 1165 μrad⊙s-1 when the driving voltage is 120 V. Under driving voltage of 60 V, the angular velocities in forward and backward motions can be up to 235100 μrad⊙s-1 and 153650 μrad⊙s-1 when the driving frequency is 1024 Hz. We can obtain the satisfactory angular velocity by choosing a proper driving voltage and frequency for the actuator.

Design and experimental performance of a piezoelectric wheelbarrow applicable to the stick-slip motion study

This paper proposes a piezoelectric wheelbarrow based on stick-slip principle. The mechanical structure and the motion principle are presented. A series of experiments are carried out to investigate the performance of the wheelbarrow and the experimental results indicate that the displacement outputs under various driving voltages and various driving frequencies show good linear relationships with the time. The resolution is 16.64nm and the velocity can reach about 587.246µm/s when the driving frequency is 256Hz and the driving voltage is 80V. The designed wheelbarrow can achieve various velocities by changing the driving voltage and driving frequency. At last a set of test system is established to study the relationship between the traction force and the load of the wheelbarrow. With the increase of the load, the traction force increases too and it can reach 16.4N when the load is 80N.