共查询到19条相似文献,搜索用时 156 毫秒
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介绍了转筒式车用电涡流缓速器的结构原理,运用虚拟边界法将内热源进行了简化处理,建立了转筒式电涡流缓速器的转筒三维模型.基于三维有限元模型,提出了电涡流缓速器制动过程中转筒温度场的计算方法.计算与试验结果对比表明,采用三维有限元模型计算能比较精确地反映转筒温度场的分布,且能够有效反映转筒温度的瞬态变化,验证了建立的三维有限元模型及其瞬态温度场计算方法的正确性. 相似文献
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介绍车用转筒式电涡流缓速器的结构,分析转筒式电涡流缓速器的性能要求。对某一型号的转筒式电涡流缓速器进行台架试验,列举部分试验项目的试验结果。台架试验表明,转筒式电涡流缓速器能在短时间内达到足够的制动力矩,满足设计要求。 相似文献
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电涡流缓速器是一种辅助制动系统,转筒式缓速器其转子采用圆筒式结构,整体质量轻,约为盘式电涡流缓速器的1/3;外形尺寸小,便于拆装,匹配方便;其产生的制动力矩可达到1400Nm,完全可以满足中小型客车的需要。 相似文献
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作为汽车辅助制动装置的永磁缓速器在工作时产生大量的热能,使转子在较短的时间内出现较大的温升,直接影响缓速器内永磁体的工作性能,严重时会引起永磁体失磁。为分析永磁缓速器中钕铁硼永磁体高温失磁的问题,建立永磁缓速器的数学模型,确定有限元分析边界条件。通过求解涡流去磁场,得到转子涡流场和永磁体比磁导分布情况,结合永磁体不同温度下退磁曲线分析永磁体失磁。试验结果验证了数值分析的正确性,表明在风冷散热条件下,永磁缓速器持续工作超过15 min永磁体会发生严重失磁,降低永磁缓速器的制动性能。 相似文献
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简述了盘式制动器电磁辅助制动装置(以下简称制动装置)的结构和原理,运用标量磁位和矢量电位,描述了制动装置三维磁场的分布,给出了制动转矩的计算方法,建立了制动装置完整的三维有限元模型。借助Maxwell软件三维瞬态求解器,获得了制动装置稳定工况时的磁感应强度和电涡流密度分布云图,分析了磁感应强度和电涡流密度分布的特点及变化规律,并计算了制动转矩,为实际设计和优化制动装置提供了一定的依据。 相似文献
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An analytical model has been developed for analyzing the braking torque in electromagnetic retarder by flux tube and armature reaction method. The magnetic field distribution in air gap, the eddy current induced in the rotor and the braking torque are calculated by the developed model. Two-dimensional and three-dimensional finite element models for retarder have also been developed. Results from the analytical model are compared with those from finite element models. The validity of these three models is checked by the comparison of the theoretical predictions and the measurements from an experimental prototype. The influencing factors of braking torque have been studied. 相似文献
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S. Arungalai Vendan S. Manoharan G. Buvanashekaran C. Nagamani 《The International Journal of Advanced Manufacturing Technology》2009,43(11-12):1144-1156
Magnetically impelled arc butt (MIAB) welding is a unique forge welding process in which an arc is drawn in the gap between the two tubes to be welded in order to raise them to a high temperature to allow forging to form a solid-state weld. In this case, the arc is rotated with a high speed around the weld line by an electromagnetic force resulting from the interaction of the magnetic field and the arc current. This paper presents the details of the results and the conclusions of the experimental trials conducted on the MIAB module designed and developed based on the principle. Further, nonlinear electromagnetic analysis has been performed to determine the magnetic field and electromagnetic force distribution in MIAB process using finite element package ANSYS. Typical results of this analysis pertaining to magnetic field are compared with the experimental data for steel tubes (outer diameter 47 mm and thickness of 2 mm). It is observed that the results from finite element analysis and the experimental trials are in excellent agreement. The proposed three-dimensional finite element method model for electromagnetic force distribution facilitates comprehensive understanding of the arc rotation process in MIAB welding. 相似文献
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An eddy current retarder for vehicles generates much heat when it works continuously, which leads to serious decline in braking
torque. This paper proposes a novel permanent magnet retarder (PMR) for vehicles, whose cooling system connects with engine
cooling-water. A three-dimensional finite element model is developed to model the electromagnetic behavior of a permanent
magnet retarder under a constant speed. The magnetic field and eddy current field in PMR are numerically solved by a finite
element method. By accounting for the nonlinear permeability of the rotor and the weakened effect in the magnetic field that
is generated by the eddy current magnetic field, the calculation accuracy of air-gap magnetic field is enhanced. Experiment
shows that the temperature of the retarder is less than 150°C, and the braking torque keeps the hard characteristics curve.
The calculated air-gap magnetic flux density is fairly good agreement with the measured one. 相似文献
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为了对电磁炮导轨的变形进行分析、研究与仿真,基于有限元分析方法,建立了身管模型;采用直接耦合法进行求解,对有磁场的电磁炮身管进行有限元分析计算,探讨了电磁炮发射时电磁力对电磁炮导轨的变形和应力分布的影响。通过计算,证明考虑磁场的耦合分析模型,比没有考虑磁场的分析模型更接近实际发射的情况,该数值模拟具有重要的参考价值。 相似文献
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磁流体液体动密封装置中磁极参数的优化设计 总被引:1,自引:1,他引:0
根据磁流体密封的工作原理,通过对密封结构模型的简化,采用有限元方法数值计算了磁极参数不同时密封间隙中磁场的轴向分布。根据磁场分布对密封性能的影响,选取了磁流体液体动密封装置中磁极的合适形状,确定了磁极极尖宽度和磁极倾斜角等参数的最佳值。 相似文献
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基于三维磁场测量的脉冲涡流检测探头的设计 总被引:4,自引:2,他引:2
为了获取更多的特征信息以提高脉冲涡流检测技术对缺陷的检测能力,设计一种新型的脉冲涡流检测探头,该探头包含一个矩形激励线圈和三个用于测量三维磁场分量的感应线圈。利用有限元法建立三维瞬态涡流问题的计算模型,研究当矩形线圈切向放置在平板导体上方时,其尺寸变化对导体内部感应涡流流动模式的影响,在线圈的长、宽和高之比为1:0.625:0.625情况下涡流分布具有如下特征:在线圈正下方的导体区域内,感应涡流同向平行流动且其密度近似相等,这种近似均匀的场分布对缺陷的尺寸和形状变化极为敏感,且十分有利于实现三维场分量的独立测量,因此脉冲涡流检测技术中传统的单维测量方式可扩充为三维检测,有效地增加可用的信息量,试验和数值结果均表明在有缺陷存在时,三维方向上的响应信号可直观地反映缺陷参数的变化,两者结果吻合,证明了新型探头的有效性和实用性。 相似文献