Performance of piezo-stacks for a piezoelectric hybrid actuator by experiments

• Published in: Journal of intelligent material systems and structures Vol. 25; no. 18; pp. 2212 - 2220
• Main Authors: Xuan, Zhefeng, Jin, Tailie, Ha, Ngoc San, Goo, Nam Seo, Kim, Tae Heun, Bae, Byung Woon, Ko, Han Seo, Yoon, Ki Won
• Format: Journal Article Conference Proceeding
• Language: English
• Published: London, England SAGE Publications 01-12-2014; Sage Publications
• Subjects: Actuators; Blocking; Cylinders; Devices; Exact sciences and technology; Fluid dynamics; Fluid flow; Fundamental areas of phenomenology (including applications); General equipment and techniques; Hydraulics; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Measurement and testing methods; Physics; Piezoelectricity; Servo and control equipment; robots; Solid mechanics; Structural and continuum mechanics; Transducers; blocked force; smart structure; Hybrid actuator; piezo-stack; self-heating; Heat sources; Power supplies; Hydraulic motors; Hydraulic control; Valves; Hydraulic cylinder; Hydraulic pump; Theft; Performance requirement; Piezoelectric transducers; Piezoelectric actuators; Cylinder set; Intelligent system; Metering
• ISSN: 1045-389X; 1530-8138
• DOI: 10.1177/1045389X14533439

Piezoelectric-hydraulic actuator is a hybrid device that consists of a hydraulic pump driven by piezoelectric stacks coupled with a conventional hydraulic cylinder and a set of fast-acting valves. Nowadays, such hybrid actuators are being researched and developed actively in many developed countries by requirement of high performance and compact flight system. In this research, operation principle and performance testing of the hybrid actuator were introduced. Two types of piezo-stacks are selected for experimental performance testing to identify the factors of piezo-stack which affect the performance of the hybrid actuator. The performance of piezo-stacks due to electrical power supply and self-heating was considered. Output no-load velocities and blocked force were measured on performance testing. The results showed that the maximum blocked force was 346 N and no-load velocity was 101 mm/s, resulting in maximum output power of 8.74 W at 1000 V applied voltage and 250 Hz pumping frequency.