本文選題：超磁致伸縮材料　切入點：氣動高速開關閥　出處：《浙江大學》2012年碩士論文　論文類型：學位論文

【摘要】：氣動高速開關閥在PWM工作模式下的比例控制特性,使其具有了替代價格高昂的氣動比例伺服閥,用于實現(xiàn)低成本伺服控制的可能性。超磁致伸縮材料,擁有響應速度快、輸出力大、并可在低磁場強度下動作等優(yōu)點,有利于從根本上提高開關閥的頻響。本文首次把超磁致伸縮材料引入氣動高速開關閥中,提出了具有新結構的設計方案,并對該類高速開關閥所具有的工作特性進行了深入的研究。論文的主要內容包括以下幾個部分： 第一,本文首先分析了現(xiàn)今氣動高速開關閥中存在的問題,論述了超磁致伸縮材料的磁致伸縮機理及其性能特點。在此基礎上,提出了一種基于超磁致伸縮材料的氣動高速開關閥的新結構。 第二,對基于超磁致伸縮材料的氣動高速開關閥的結構設計要點進行了細致的分析研究。主要涉及開關閥線圈及其骨架設計、溫度場仿真及熱補償機構、磁路設計及電磁場仿真、預壓力和微位移放大機構設計及仿真,解決了結構設計中的關鍵問題,為研制具有較高性能的氣動高速開關閥的研發(fā)奠定了基礎。 第三,在前述新型氣動高速開關閥硬件方案基礎上,基于超磁致伸縮機電轉換模型、材料力學以及懸臂梁振動等理論建立了開關閥的動態(tài)響應模型,并基于該模型,依據(jù)設計參數(shù)進行了仿真,分析了相關重要參數(shù)對開關閥性能的影響,為該型氣動高速開關閥的優(yōu)化設計提供了重要的理論支持。 第四,搭建了實驗系統(tǒng),對研制出的超磁致伸縮氣動高速開關閥樣機進行了穩(wěn)態(tài)及動態(tài)實驗研究,包括穩(wěn)態(tài)流量特性實驗、閥口開度實驗、動態(tài)響應特性實驗等,實驗測得開關閥在700Hz時的閥口開度為低頻段時的74.5%,且閥口開度在60μm以上時,開關閥的流量特性剛度較好,此時在上游壓力為6bar時,最大流量在80L/min以上。根據(jù)實驗結果與仿真結果的差異進行了分析。
[Abstract]:The proportional control characteristic of pneumatic high speed switch valve in PWM mode makes it possible to replace the high cost pneumatic proportional servo valve, which can be used to realize low cost servo control. The advantages of large output force and can be operated under low magnetic field intensity are beneficial to improve the frequency response of the switch valve fundamentally. In this paper, the giant magnetostrictive material is introduced into the pneumatic high speed switch valve for the first time, and the design scheme with new structure is put forward. The working characteristics of this kind of high speed switch valve are studied deeply. The main contents of this paper include the following parts:. Firstly, the problems existing in pneumatic high speed switch valves are analyzed, and the magnetostrictive mechanism and performance characteristics of giant magnetostrictive materials are discussed. A new structure of pneumatic high speed switch valve based on giant magnetostrictive material is proposed. Secondly, the structural design points of pneumatic high speed switch valve based on giant magnetostrictive material are analyzed and studied in detail. It mainly involves the design of switch valve coil and its skeleton, the simulation of temperature field and the thermal compensation mechanism. The design of magnetic circuit and electromagnetic field, the design and simulation of pre-pressure and micro-displacement amplifying mechanism solve the key problems in structure design, and lay a foundation for the research and development of pneumatic high-speed switch valve with high performance. Thirdly, on the basis of the hardware scheme of the new pneumatic high speed switch valve, the dynamic response model of the switch valve is established based on the theory of giant magnetostrictive electromechanical conversion model, material mechanics and cantilever beam vibration. The simulation is carried out according to the design parameters, and the influence of relevant important parameters on the performance of the switch valve is analyzed, which provides an important theoretical support for the optimization design of the pneumatic high speed switch valve. In 4th, the experimental system was set up, and the steady and dynamic experiments were carried out on the prototype of the giant magnetostrictive pneumatic high speed switch valve, including steady state flow characteristic experiment, valve opening experiment, dynamic response characteristic experiment, etc. The experimental results show that the opening degree of the valve at 700 Hz is 74.5 when the opening of the valve is over 60 渭 m, and the flow characteristic stiffness of the valve is better when the upstream pressure is 6 bar. The maximum flow rate is over 80 L / min. The difference between the experimental results and the simulation results is analyzed.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH138.521

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本文編號：1615400