共查询到17条相似文献,搜索用时 187 毫秒
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本文提出了液力变矩器叶片表面准三维边界层计算的一种数值方法,并将边界层的计算与叶轮主流区三维流动计算相互迭代,完成了叶轮内无粘-有粘相互作用的三维流场计算。利用激光多普勒测速仪对YB-355变矩器内部流场进行了实测,测定结果与理论计算对比表明,本文所提出的计算变矩器内部流场的方法是合理的。 相似文献
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本文综述了近年来的液力变矩器内流场研究领域开展的工作,对所使用的理论计算方法、实验方法进行了分类、介绍和评价。提出了变矩器流场计算的评判准则。并给出了使用一种新的计算方法-流面迭代法计算变矩器流场三维流动的实例。 相似文献
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利用流固耦合仿真平台,对液力变矩器各工况下的流场进行数值计算,分析其结构与流体之间的耦合作用,得到3个工作轮叶片的应力应变和叶片变形后变矩器内部流场情况;并通过与不考虑流固耦合时流场分布的对比,分析了流固耦合作用对液力变矩器传动效率和叶片强度的影响.结果表明,叶片变形使得流场中涡带增加,紊动加剧,液力变矩器传动效率有所下降;另外,考虑流固耦合作用后,速比0.01时的涡轮叶片最大变形增大了约46.5%,相应的最大应力也增加约45.2%,这意味着忽略叶片弹性高估叶片结构的安全性. 相似文献
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为了研究叶片数变化对液力变矩器原始特性的影响,通过Imageware逆向建模得到了变矩器的流道模型,并进行了高速比工况下的三维流场计算,根据计算结果分析了不同工作轮叶片数对变矩器原始特性的影响;选取4种典型工作轮叶片数的组合方案进行台架试验,对计算结果进行验证。结果表明:试验与计算结果平均误差为3.1%,最大误差为4.2%,证明三维流场计算结果是准确的,采用三维流场计算液力变矩器性能是可行的。 相似文献
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液力变矩器流场计算的有限元法 总被引:4,自引:0,他引:4
本文以两类相对流面模型为基础,发展了变矩器内部流场计算的液体有限元法。文中推求了流面上的流函数方程,进行了有限元分析,并计算了部分实例。 相似文献
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为了得到高效率的液力变矩器,对工作轮叶片角与变矩器性能之间的关系进行了研究。根据变矩器的能量损失和平衡建立了某工程机械用液力变矩器的数学模型,得到了转速比为0.12和0.28时工作轮叶片出口角度对变矩器效率、泵轮力矩、涡轮力矩和变矩系数的影响规律;通过Imageware建立了变矩器的流道模型,并进行高速比工况的三维流场数值模拟,对泵轮和导轮不同出口角时变矩器的原始特性进行了对比分析。结果表明,导轮出口角的大小对变矩器性能有较大影响,角度过大或者过小都会降低变矩器的效率。 相似文献
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Nonlinear Robust Control of Torque Converter Clutch Slip System for Passenger Vehicles Using Advanced Torque Estimation Algorithms 总被引:3,自引:0,他引:3
Jin-Oh Hahn Kyo-Il Lee 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2002,37(3):175-192
In this paper, a torque-estimation-based robust controller for passenger car torque converter clutch slip system is presented. The proposed robust controller uses only the measurements available from inexpensive sensors that are installed in current passenger vehicles for torque estimation and feedback control. A conventional full state observer along with a neural-network-based open-loop hydraulic actuator observer is designed to estimate the unknown driving load, and a neural-network-based turbine torque estimator considering the temperature of oil circulating the torque converter is developed for improved turbine torque estimation accuracy. The stability of the internal dynamics is also investigated, and the performance and robustness of the robust controller is validated by simulation studies. 相似文献
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《JSAE Review》1994,15(4):309-314
Specific fuel consumption is a key word these days, and the torque converter can play an important role in improving it. This makes it essential to improve the accuracy of methods for predicting torque converter performance. In this work, the accuracy of performance predictions ws improved by replacing the flow angle and total pressure loss in the angular momentum theory with corresponding values obtained by analyzing the flow around the stator using a general flow analysis code. A quick and highly accurate prediction of torque converter performance is made possible with this method. 相似文献
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D. M. Chun J. C. Lee J. C. Yeo S. H. Ahn S. S. Hong J. D. Jang 《International Journal of Automotive Technology》2011,12(2):273-280
In new slim torque converters, lock-up clutches are used to provide high fuel efficiency at low speed. However, the slimness
of the converters causes difficulty in heat dissipation, which may damage the friction material and shorten its life span.
A cooling hole in the lock-up piston reduces the heat but also reduces the torque because oil flows through the hole due to
the pressure difference between the two faces of the piston. In the early stages of the development of this type of torque
converter, designers must consider the minimum flow rate required to cool the friction material and the minimum torque capacity
required to transmit the engine torque. This research explored two methods of estimating these parameters. In the first method,
an estimation equation was derived by combining the response surface method with physical properties such as the centrifugal
force, a sudden expansion, a sudden contraction, and the steady flow energy equation. The second method involved the use of
an artificial neural network. The feasibility of the estimates based on statistics and on the artificial neural network were
confirmed in the design stage by comparing experimental and estimated data. An estimation program was created using the C#.Net
language and has been used for actual torque converter designs by the Korea Powertrain Company. 相似文献