本文選題：下運帶式輸送機 + 磁流變制動器　； 參考：《太原科技大學》2017年碩士論文

【摘要】：在下運帶式輸送機的制動系統(tǒng)中,采用傳統(tǒng)摩擦制動或液壓制動會存在“熱衰退”、制動尖叫、制動閘瓦磨損嚴重、制動力矩不能連續(xù)調(diào)控等問題。而磁流變制動器作為一種新型的線控制動器,可以極好的彌補這些缺點,其具有能耗低、制動時間短、部件磨損小、制動力矩可調(diào)可控、便于集成新型控制技術(shù)等優(yōu)點,這些優(yōu)點十分契合下運帶式輸送機的制動需求。針對這一問題,本文對傳統(tǒng)單線圈混合式磁流變制動器進行改進,設計了一種雙線圈旁置式新型磁流變制動器,并將其應用到小型下運帶式輸送機的制動系統(tǒng)中,以達到在增大磁流變制動器制動力矩的同時實現(xiàn)輕量化設計的目的。首先從微觀角度對磁流變制動器的制動機理進行了數(shù)值模擬,搭建了磁流變液中磁性顆粒的動力學仿真模型,研究了磁流變液體積分數(shù)和磁場強度對其成鏈微觀結(jié)構(gòu)的影響,對磁性顆粒在磁場作用下的剪切過程進行了數(shù)值模擬。其次以某小型下運帶式輸送機為例,計算了該下運帶式輸送機所需制動力矩,根據(jù)所需制動力矩,設計了一種雙線圈旁置式磁流變制動器�；贖erscher-Bulkley模型,推導了雙線圈旁置式磁流變制動器的力矩模型,并提出了相應的磁路設計方法。同時為了提高雙線圈旁置式磁流變制動器制動力矩,實現(xiàn)輕量化設計的目的,提出了一種基于有限元分析和多目標遺傳算法的聯(lián)合優(yōu)化設計方法。利用該方法得到了磁路結(jié)構(gòu)的Pareto非劣解集,并選用組合賦權(quán)法對Pareto非劣解進行選優(yōu),得到了制動器最佳的磁路結(jié)構(gòu)參數(shù)。最后通過對磁流變液的Bingham模型進行修正,得到磁流變液的等效表觀粘度,并將其作為聯(lián)系磁場、流場、溫度場的重要中間變量。另外,建立了雙線圈旁置式磁流變制動器的運動學方程,基于麥克斯韋方程、Navier-Stokes連續(xù)性方程、共軛傳熱方程,采用序貫耦合法建立了磁流變制動器的磁流固熱多物理場耦合仿真模型,得到了雙線圈旁置式新型磁流變制動器在下運帶式輸送機非制動工況下的穩(wěn)態(tài)溫度分布,以及制動工況下的磁場分布、流場分布、瞬態(tài)溫度場分布。結(jié)果表明所提出的雙線旁置式新型磁流變制動器可以滿足小型下運帶式輸送機的制動要求。本論文的研究可以為磁流變制動器的結(jié)構(gòu)設計、磁路設計以及優(yōu)化分析提供參考,同時也能為下運帶式輸送機的制動方式提供了一種新的選擇方案。
[Abstract]:In the braking system of belt conveyor, the traditional friction brake or hydraulic brake will have some problems, such as "heat decline", brake scream, brake shoe wear and brake torque can not be controlled continuously. As a new type of wire brake, magnetorheological brake can make up for these shortcomings. It has the advantages of low energy consumption, short braking time, small wear of parts, controllable braking torque, and easy to integrate new control technology. These advantages are in line with the brake requirements of the belt conveyor. To solve this problem, this paper improves the traditional single-coil hybrid magnetorheological brake, designs a new type of double-coil side-mounted magneto-rheological brake, and applies it to the braking system of a small down-load belt conveyor. In order to achieve the purpose of lightweight design while increasing the braking torque of Mr brake. Firstly, the braking mechanism of magneto-rheological brake is numerically simulated from the microscopic point of view, and the dynamic simulation model of magnetic particles in the magnetorheological fluid is built, and the effects of the integral number and magnetic field intensity of the magnetorheological fluid on the chain microstructure are studied. The shear process of magnetic particles under the action of magnetic field is numerically simulated. Secondly, the braking torque of a small down belt conveyor is calculated. According to the required braking moment, a magnetic rheological brake with two coils is designed. Based on the Herscher-Bulkley model, the torque model of the double-coil side-mounted magneto-rheological brake is derived, and the corresponding magnetic circuit design method is proposed. At the same time, in order to improve the braking torque of the double-coil side-mounted magnetorheological brake and realize the lightweight design, a joint optimization design method based on finite element analysis and multi-objective genetic algorithm is proposed. By using this method, the Pareto noninferior solution set of magnetic circuit structure is obtained, and the optimal magnetic circuit structure parameters of the brake are obtained by selecting the Pareto noninferior solution by using the combinatorial weighting method. Finally, by modifying the Bingham model of MRF, the equivalent apparent viscosity of MRF is obtained, which is regarded as an important intermediate variable of magnetic field, flow field and temperature field. In addition, the kinematics equation of the double-coil side-mounted magneto-rheological brake is established. Based on Maxwell's equation, the Navier-Stokes continuity equation and the conjugate heat transfer equation are established. The simulation model of magneto-fluid-solid-heat multi-physical field coupling of magneto-rheological brake was established by sequential coupling method. The steady state temperature distribution of a new type of magneto-rheological brake with two coils was obtained under the non-braking condition of the belt conveyor. And the distribution of magnetic field, flow field and transient temperature field under braking condition. The results show that the new type of magnetorheological brake can meet the brake requirements of small downloadable belt conveyors. The research in this paper can provide a reference for the structure design, magnetic circuit design and optimization analysis of the MRF brake, and also provide a new option for the braking mode of the downward belt conveyor.
【學位授予單位】：太原科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH222

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本文編號：2013161