本文選題：超磁致伸縮致動器　切入點：高頻振動　出處：《武漢理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：超磁致伸縮材料是一種新型的功能材料，在高頻驅(qū)動磁場作用下，其共振輸出高達4000ppm的應變值，遠高于普通頻域驅(qū)動時的1500ppm。超磁致伸縮材料的非線性特征使得在探究GMA高頻振動特性、量化GMA高頻振動時輸入與輸出上存在著較大的困難，嚴重制約著高頻振動條件下GMA實際工程應用的深度和廣度。本文以一款自主開發(fā)設(shè)計、面向高頻振動輸出的GMA為研究對象，圍繞器件高頻振動特性主要完成了以下研究工作： (1)研究分析了應用于高頻驅(qū)動GMA的主要特點及設(shè)計過程中主要考慮因素，在完成器件的動靜態(tài)磁場仿真設(shè)計、磁場均勻性分析、預壓機構(gòu)及溫控系統(tǒng)的基礎(chǔ)上，繪制了器件的二維圖紙，并按設(shè)計方案制作了1:1的實物樣機。以GMA實物為中心，配套搭建了用于器件輸出特性測量的實驗平臺。 (2)對動態(tài)磁滯建模中的關(guān)鍵技術(shù)進行了研究，在經(jīng)典J-A模型基礎(chǔ)上，引入時變負載及預壓彈簧動態(tài)微應力影響，建立了改進的J-A磁滯模型；在線性壓磁方程基礎(chǔ)上，考慮材料應力項與材料內(nèi)部磁場強耦作用，建立了用于描述超磁致伸縮材料磁場-機械場的強耦合模型；結(jié)合致動器結(jié)構(gòu)動力學模型，聯(lián)立建立了用于描述超磁致伸縮致動器磁-機耦合磁滯非線性動力學數(shù)學模型建模，豐富了超磁致伸縮材料及其器件的建模方法。 (3)在有限元軟件ANSYS平臺上，以電磁比擬理論為基礎(chǔ)，完成了對GMA磁場-機械場耦合建模，在耦合模型的基礎(chǔ)上，探究了不同GMM棒體切片層數(shù)對材料振動模態(tài)的影響，考量了瞬態(tài)分析中脈沖寬度與質(zhì)量塊分別對GMA瞬態(tài)響應特性的影響，考量諧波分析中驅(qū)動頻率對GMA輸出特性的影響，根據(jù)仿真結(jié)果為器件工作狀態(tài)優(yōu)選及優(yōu)化設(shè)計提供理論依據(jù)。 (4)完成了準靜態(tài)與動態(tài)驅(qū)動下GMA輸出特性實驗研究。在準靜態(tài)實驗中，主要研究了關(guān)于預應力及驅(qū)動磁場強度對GMA輸出特性的影響，為器件的動態(tài)測試狀態(tài)優(yōu)選打下了良好的實驗基礎(chǔ)；在動態(tài)輸出實驗中，，主要探究了驅(qū)動電壓、驅(qū)動電流與驅(qū)動頻率對GMA動態(tài)輸出特性的影響，并就實驗結(jié)果給出了合理的解釋。
[Abstract]:Giant magnetostrictive material is a new type of functional material whose resonance output is as high as 4000 ppm under the action of high frequency magnetic field. The nonlinear characteristics of giant magnetostrictive materials make it difficult to study the high frequency vibration characteristics of GMA and quantify the high frequency vibration of GMA. The depth and breadth of the practical engineering application of GMA under the condition of high frequency vibration are seriously restricted. In this paper, a GMA which is independently developed and designed for the output of high frequency vibration is taken as the research object, and the following research work is mainly done around the high frequency vibration characteristics of the device:. In this paper, the main characteristics of high frequency driving GMA and the main factors considered in the design process are analyzed. On the basis of completing the static and static magnetic field simulation design, the magnetic field uniformity analysis, the preloading mechanism and the temperature control system, The two-dimensional drawing of the device is drawn, and the prototype of 1: 1 is made according to the design scheme. The experimental platform for measuring the output characteristics of the device is set up with GMA as the center. Based on the classical J-A model, the improved J-A hysteresis model is established by introducing the influence of time-varying load and dynamic micro-stress of preloaded spring, and on the basis of the linear piezomagnetic equation, the improved J-A hysteresis model is established. Considering the strong coupling between the material stress term and the magnetic field inside the material, a strong coupling model is established to describe the magnetic field and mechanical field of the giant magnetostrictive material, and the dynamic model of the actuator structure is combined. The mathematical model of magnetostrictive actuator coupled with magneto-mechanical hysteresis is established simultaneously, which enriches the modeling method of giant magnetostrictive material and its devices. On the platform of finite element software ANSYS, based on the theory of electromagnetic analogy, the coupling modeling of GMA magnetic field and mechanical field is completed. On the basis of the coupling model, the influence of the number of slice layers on the vibration modes of materials is investigated. The effects of pulse width and mass block on the transient response of GMA in transient analysis and the effect of driving frequency on the output characteristics of GMA in harmonic analysis are considered. The simulation results provide a theoretical basis for the optimal selection and design of the device working state. In the quasi static experiment, the influence of prestress and driving magnetic field intensity on the output characteristics of GMA is studied. In the dynamic output experiment, the effects of driving voltage, driving current and driving frequency on the dynamic output characteristics of GMA are mainly discussed. A reasonable explanation is given for the experimental results.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB381;TB53

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