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国家自然科学基金(51275039)

作品数:7 被引量:13H指数:2
相关作者:崔红伟姚寿文闫清东林博冯姗姗更多>>
相关机构:北京理工大学太原理工大学中国机械工业联合会更多>>
发文基金:国家自然科学基金更多>>
相关领域:机械工程交通运输工程理学矿业工程更多>>

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Numerical film torque modeling of friction pair in hydro-viscous clutchs被引量:1
2014年
A numerical model to predict film torque of hydro-viscous clutch was developed.The model was established with computational fluid dynamics(CFD).The pressure distribution,velocity of flow and film torque were obtained based on vertical-horizontal grooved plate and radial grooved plate separately.The boundary conditions,such as the relative rotation,the fluid temperature and the oil feeding pressure,were also discussed.The results showed that the film torque of two kinds of grooved plate increased with increasing relative rotation.However,the film torque decreased with increasing fluid temperature and feeding pressure.Meanwhile,the film torque of radial grooved plate was less than vertical-horizontal grooved plate at the same condition.Our study showed that the model can efficiently calculate the film torque with complex geometry parameters and boundary conditions.
姚寿文崔红伟王修鹏冯珊珊
液黏传动双圆弧油槽摩擦副油膜剪切转矩研究被引量:1
2016年
双圆弧油槽摩擦副广泛应用于液黏传动,为了研究油槽结构参数对油膜剪切转矩的影响,对摩擦副间流体的流动特性进行数值模拟,得到了油膜剪切转矩。建立了集流场参数化建模(CAD)、数值模拟(CFX)、试验设计方法(DOE)及响应曲面法(RSM)为一体的油槽参数影响分析平台,分析了油槽深度、油槽宽度和油槽数目对油膜剪切转矩的影响并建立了近似响应曲面模型。搭建转矩性能试验台进行试验验证,结果表明:油膜剪切转矩随着油槽深度、宽度和数目的增大均减小,而油槽宽度对转矩的影响最大,油槽深度影响次之,油槽数目影响最小。通过理论和试验研究,应用CFX数值模拟和建立摩擦副油槽参数影响分析平台实现了CAD、CFX、DOE及RSM等技术的高度融合,可以准确地分析摩擦副油槽参数对油膜剪切转矩的影响。
崔红伟姚寿文邓元元
关键词:摩擦副
An improved method for evaluating the rotational speed stability of a hydro-viscous clutch in mixed lubrication被引量:2
2015年
Rotational speed stability is an important evaluation indicator of the performance of a hydro-viscous clutch(HVC).To improve the rotational speed stability of HVCs in mixed lubrication and the running condition of the friction pairs,the speed stability of an HVC in mixed lubrication was studied.To this end,the friction coefficients of both copper-based and paper-based friction pairs were experimentally tested using an MM1000-III wet friction machine.Theoretically,a torsional vibration model of the system is presented.The phase plane analysis method is applied to evaluate the stability of the torsional vibration model,where a critical negative gradient(CNG)is defined.The results show that the friction coefficient in mixed lubrication is an important parameter for the stability of the rotational speed.The system will be unstable when the negative gradient of the friction coefficient-slip speed is larger than the CNG.According to the definition of the CNG,suggestions regarding choice of friction pairs are made to improve the rotational speed stability of an HVC in mixed lubrication.
Shou-Wen YAOQian LIUHong-Wei CUIShan-Shan FENG
液粘调速离合器混合摩擦阶段稳定性研究
为了对液粘调速离合器混合摩擦阶段的摩擦转矩稳定性及其影响因素进行研究。首先讨论了摩擦副转矩-转速保持稳定的条件,计算了摩擦副混合摩擦阶段的总转矩,分析了各个参数对稳定性的影响,另外,基于斯特里贝克模型中摩擦系数随着相对滑...
姚寿文刘茜崔红伟冯珊珊
关键词:液粘调速离合器稳定性
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液黏调速离合器摩擦副润滑油道设计及特性分析被引量:2
2012年
为了使液黏调速离合器摩擦副间隙尽可能地均匀分布,满足工作性能和散热要求。基于不可压缩流体控制方程和Shear Stress Transport(SST)湍流模型,建立了两种油道结构的三维流场模型,应用ANSYS CFX对润滑油道的流场进行数值模拟计算,研究了油道结构对摩擦副入口处油压和流速分布的影响。结果表明:润滑油道结构对摩擦副入口压力和流速影响比较明显,改进后的油道结构压力损失较小且喷油孔的油压和流速分布比较均匀,有助于摩擦片和对偶钢片间隙的均匀分布,能更好地满足液黏传递转矩和散热的要求。
崔红伟姚寿文闫清东王修鹏李文达
关键词:计算流体动力学
Mathematical Model and Experiment Validation of Fluid Torque by Shear Stress under Influence of Fluid Temperature in Hydro-viscous Clutch被引量:6
2014年
The current design of hydro-viscous clutch(HVC) in tracked vehicle fan transmission mainly focuses on high-speed and high power. However, the fluid torque under the influence of fluid temperature can not be predicted accurately by conventional mathematical model or experimental research. In order to validate the fluid torque of HVC by taking the viscosity-temperature characteristic of fluid into account, the test rig is designed. The outlet oil temperature is measured and fitted with different rotation speed, oil film thickness, oil flow rate, and inlet oil temperature. Meanwhile, the film torque can be obtained. Based on Navier-Stokes equations and the continuity equation, the mathematical model of fluid torque is proposed in cylindrical coordinate. Iterative method is employed to solve the equations. The radial and tangential speed distribution, radial pressure distribution and theoretical flow rate are determined and analyzed. The models of equivalent radius and fluid torque of friction pairs are introduced. The experimental and theoretical results indicate that tangential speed distribution is mainly determined by the relative rotating speed between the friction plate and the separator disc. However, the radial speed distribution and pressure distribution are dominated by pressure difference at the lower rotating speed. The oil film fills the clearance and the film torque increases with increasing rotating speed. However, when the speed reaches a certain value, the centrifugal force will play an important role on the fluid distribution. The pressure is negative at the outer radius when inlet flow rate is less than theoretical flow, so the film starts to shrink which decreases the film torque sharply. The theoretical fluid torque has good agreement with the experimental data. This research proposes a new fluid torque mathematical model which may predict the film torque under the influence of temperature more accurately.
CUI HongweiYAO ShouwenYAN QingdongFENG ShanshanLIU Qian
车用高速风扇液黏离合器流体传动特性分析被引量:2
2017年
为精确预测高速工况的流场特性,运用自由表面(VOF)模型,对摩擦副流体进行了数值模拟,得到了两相流区域分布及其演变规律,预测了全转速范围的转矩。研究表明:两相流区域主要受流体动压效应、流体静压效应影响;输入转速越高,摩擦副流体空气体积分数越大,供油量越大,空气体积分数越小;流体转矩随着转速升高而增大,而过某临界值时,转矩下降。作者还构建了液黏调速离合器性能试验台架,对摩擦副的油膜转矩传递特性进行试验,验证了预测模型的合理性。
姚寿文林博冯姗姗崔红伟
关键词:VOF模型两相流
液黏调速离合器油槽结构参数优化设计被引量:2
2013年
为了减小液黏调速离合器的带排转矩,降低摩擦副的空载功率损失,以双圆弧油槽摩擦副为研究对象,建立基于计算流体动力学流场数值分析、实验设计方法、响应曲面法及数值优化算法为一体的液黏调速离合器摩擦副集成优化设计平台.分析液黏调速离合器摩擦副油槽参数对带排转矩的影响,对结构参数进行优化设计.结果表明:随着油槽宽度和油槽深度的增大,液黏调速离合器转矩均呈现下降的趋势,但是随着油槽数目的增多,液黏调速离合器转矩呈现单调上升的趋势.优化后,减小了液黏调速离合器的带排转矩,提高了发动机的实际输出功率.
崔红伟潘鑫姚寿文闫清东
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