共查询到18条相似文献,搜索用时 218 毫秒
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对燃料电池空压机悬置子系统采用ADAMS进行建模,计算其刚体模态和解耦率。模态间隔不满足要求的情况下,使用ADMAS/Insight进行多目标优化。悬置刚度优化后解耦率所有方向大于80%,转子转动方向达到94%,模态频率分布避开路面和空压机本体怠速激励,前6阶模态间隔大于1Hz。对该悬置系统进行7种极限工况运算,求出其位移和受力分布,为燃料电池系统布置提供理论依据。 相似文献
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《机械设计与制造》2016,(9)
汽车动力总成悬置系统(Powertrain Mounting System,简称PMS)的设计好坏直接影响整车的NVH(噪声、振动和声振粗糙度)性能。针对某企业新车型研发的实际需求,对悬置系统进行解耦优化设计。首先建立悬置系统模型,得到系统固有特性一般方程式;再以MATLAB为开发平台,运用能量法编写优化程序,对悬置软垫三个主轴方向的刚度、位置和角度(也称悬置倾角)均进行了优化;最后将优化前后结果进行对比分析,并通过ADAMS软件验证。由分析结果可知,经优化过的固有频率分布较为合理,系统在六个激励振动方向的解耦率、固有频率最大最小值、频率差均满足企业的高标准要求,对动力总成悬置系统的设计具有一定的参考价值。 相似文献
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《中国工程机械学报》2016,(4)
在ANSYS中以质量矩阵单元、刚性梁单元和弹簧单元为基本单元,应用APDL程序语言对汽车动力总成悬置系统进行参数化建模与模态分析,基于能量法解耦进行模态解耦度计算与分析;应用ANSYS中的优化模块对各个悬置元件的刚度进行优化配置,使得该悬置系统的6阶模态尽可能解耦;优化后的动力总成悬置系统的6阶模态频率分布在合理范围内,6阶模态的解耦度也得到了显著提高. 相似文献
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介绍了通过建立动力总成橡胶悬置系统力学模型,计算橡胶悬置系统刚度矩阵、固有频率、主振型和能量解耦。利用EXCEL/VBA编程制作橡胶悬置系统解耦EXCEL计算表,通过EXCEL计算表快速计算出悬置系统的固有频率、主振型和解耦能量分布。为对悬置系统设计是否满足要求进行判定作依据。 相似文献
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本文针对某四缸发动机模态解耦率较差的问题,对发动机悬置系统模态进行优化设计。首先通过多体动力学软件,建立6自由度发动机悬置系统模型,对模型进行模态分析和计算。以悬置元件的刚度和位置参数为主要设计变量,悬置系统模态能量解耦率为优化目标,采用遗传算法对模型进行优化。优化后,发动机悬置系统的解耦水平有显著提高。 相似文献
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目前橡胶悬置仍广泛应用于重型汽车,针对其刚度特性的不确定性,根据能量解耦理论和基于扭矩轴的解耦理论,采用基于σ水平的稳健优化方法对悬置系统进行稳健设计。设计过程中采用多岛遗传算法寻优并运用矩阵法计算响应函数的均值与方差。最后以某悬置系统为例,根据静平衡和弯矩要求确定悬置各向刚度的初始值;按照稳健优化设计流程建立六自由度模型并求解计算。结果表明,应用此方法对悬置系统进行优化能够合理布置固有频率并提高各向解耦率,保证设计目标的鲁棒性,避免系统因刚度差异导致失效的问题。 相似文献
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The design strategies for powertrain mounting systems play an important role in the reduction of vehicular vibration and noise. As stiffness and damping elements connecting the transmission system and vehicle body, the rubber mount exhibits better vibration isolation performance than the rigid connection. This paper presents a complete design process of the mounting system, including the vibration decoupling, vibration simulation analysis, topology optimization, and experimental verification. Based on the 6?degrees?of?freedom vibration coupling model of the powertrain mounting system, an optimization algorithm is used to extract the best design parameters of each mount, thus rendering the mounting system fully decoupled and the natural frequency well configured, and the optimal parameters are used to design the mounting system. Subsequently, vibration simulation analysis is applied to the mounting system, considering both transmission and road excitations. According to the results of finite element analysis, the topological structure of the metal frame of the front mount is optimized to improve the strength and dynamic characteristics of the mounting system. Finally, the vibration bench test is used to verify the availability of the optimization design with the analysis of acceleration response and vibration transmissibility of the mounting system. The results show that the vibration isolation performance of the mounting system can be improved effectively using the vibration optimal decoupling method, and the structural modification of the metal frame can well promote the dynamic characteristics of the mounting system. 相似文献
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悬置系统设计的核心是合理设计悬置元件的位置、角度和刚度,以提高悬置系统各向谐振模态解耦度,并使各向自振频率分别避开发动机怠速频率、车架、车身各向自振频率等,从而提高悬置系统的隔振效果。在悬置系统模态分析的基础上,建立了以提高悬置系统解耦度和各向谐振频率尽可能接近期望值为目标的悬置系统自动优化设计数学模型,并以某发动机动力总成悬置系统为应用案例,对其悬置元件的位置、角度和刚度进行自动优化设计计算,获得了预期的优化效果。 相似文献
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The existing torque roll axis(TRA) decoupling theories for a powertrain mounting system assume that the stiffness and viscous damping properties are constant. However, real-life mounts exhibit considerable spectrally varying stiffness and damping characteristics, and the influence of the spectrally-varying properties of the hydraulic mounts on the powertrain system cannot be ignored. To overcome the deficiency, an analytical quasi-linear model of the hydraulic mount and the coupled properties of the powertrain and hydraulic mounts system are formulated. The influence of the hydraulic mounts on the TRA decoupling of a powertrain system is analytically examined in terms of eigensolutions, frequency, and impulse responses, and then a new analytical axiom is proposed based on the TRA decoupling indices. With the experimental setup of a fixed decoupler hydraulic mount in the context of non-resonant dynamic stiffness testing procedure, the quasi-linear model of the hydraulic mount is verified by comparing the predictions with the measurement. And the quasi-linear formulation of the coupled system is also verified by comparing the frequency responses with the numerical results obtained by the direct inversion method. Finally, the mounting system with a combination of hydraulic mounts is redesigned in terms of the stiffness, damping and mount locations by satisfying the new axiom. The frequency and time domain results of the redesigned system demonstrate that the torque roll axis of the redesigned powertrain mounting system is indeed decoupled in the presence of hydraulic mounts (given oscillating torque or impulsive torque excitation). The proposed research provides an important basis and method for the research on a powertrain system with spectrally-varying mount properties, especially for the TRA decoupling. 相似文献
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以当前正在开发的一款新型客车的悬置系统为例,详细描述了解耦优化设计方法在动力总成悬置系统开发过程中的应用。在悬置系统动力学仿真分析的基础上,进行了悬置支架解耦优化设计,提高了系统解耦率。对各悬置点承载及位移进行分析,为悬置元件非线性刚度设计提供了参考依据。 相似文献