Study On Precision Stepping Driving Technology Based On Piezoelectric Pump And ER-Valve Hydraulic System

Precision drive technology is the modern technology and an important area of modern industrial technology. Piezoelectric and electro-rheological hybrid reactor driven by piezoelectric stack as a power source to electrorheological fluid-solid - liquid conversion cut-off characteristics of the role of the working principle to achieve high-performance precision stepper drive. Since the drive system is involved in mechanics, materials science and multidisciplinary field of fluid mechanics, etc., and the system has a high frequency, high-stepping speed, high-resolution, big trip, the driving force, no mechanical wear and many other features of modern science and technology in and modern industrial technology has broad application prospects. This paper attempts to drive in the new design principle and structure of research work carried out in order to achieve better system performance.First of all papers on precision piezoelectric drive the development of the application and the status quo at home and abroad, the precision of traditional pump-driven and the piezoelectric / electro-rheological valve hybrid drive compared precision obtained pump / valve hybrid drive can be overcome traditional precision precision driven friction, wear and mechanical fatigue, and many other shortcomings. Further affirmed the pump / valve hybrid drive technology applications.Followed by a discussion of the piezoelectric material and the basic physical properties of the most important performance parameters, including the electromechanical coupling coefficient, elasticity coefficient, mechanical quality factor, such as piezoelectric constant. In order to better understand the work of piezoelectric stack heap and how to use features, combined with the paper used by the Japanese company NEC-TOKIN production reactor AE0505D16 piezoelectric stack, through the establishment of precision displacement measurement and control system, testing system stiffness, dynamic measurement system of piezoelectric stack heap AE0505D16 displacement characteristics, the stiffness characteristics and frequency response characteristics of the test analysis.Piezoelectric stack in such a reactor for power sources, design a new pump stack heap structure - single-chamber reactor stack Bimorph pump, the structure is the use of live Saiga sealed metal diaphragm cavity structure, both to improve deformation area of the cavity and to achieve a good sealing effect to the output flow, the output characteristics of high pressure. Based on the principle of the development of two prototype pump - Single-symmetric cavity pairs of piezoelectric stack and staggered stack pump cavity Bimorph single stack reactor pump, and through the CFD analysis and experimental tests of these two pump compared to draw the staggered single-cavity dual-stack heap pump for better structure. In the medium water conditions, the structure of the piezoelectric pump test-bed reactor stack, the voltage through the pilot study, the frequency of the output flow rate and voltage frequency on the output pressure, draw the following conclusions:(1)With the input voltage increases, the output flow and pressure with the increase, but no linear relationship.(2)With the increase in the frequency of the output pump with increased flow, when the frequency increased to about 13Hz, the output reached the maximum, and with increasing frequency, the output volume will gradually decrease. The output pressure is generally increased with the frequency increase in the output pressure of about 7Hz maximum.The use of the stack for the power source heap pumps, set up the pump / valve hybrid drive system, through the calculation of theoretical analysis and CFD analysis of the system of local head loss, and import and export losses and resistance along the way, such as energy loss, and the corresponding solution methods and measures.Under the pump / valve hybrid technology-driven requirements, the preparation of the particle concentration of 30% of the electrorheological fluid, set up a test-bed system testing, the system through the pilot study the driving force of piezoelectric stack and heap pumps, valves ER the ability to work The relationship between measurement; system with piezoelectric stack step resolution pump the flow reactor the relationship between resolution; system stacked piezoelectric stepping speed and the frequency of sand pumps, the relationship between traffic. About the conclusions reached:(1)With the resolution of piezoelectric pump flow growth, step resolution system, but not linear growth.(2)With the increase in voltage of the drive system in a rapid growth, but when the voltage reaches 20V, the driving force will become more stable, large and small in the vicinity of 1.8kgf.(3)With the frequency stepping speed increased, and faster growth; also with increased traffic, but relatively slow growth rate.Through the piezoelectric pump / valve hybrid ER precision drive system to achieve a sophisticated, high-frequency, large load, high-speed, stable performance and characteristics of stepper drives with a wide range of applications.