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首页> 外文会议>DE-vol.119; CED-vol.11; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >THE INFLUENCE OF MAGNETO-RHEOLOGICAL FLUID TIME RESPONSE ON THE PERFORMANCE OF SEMI-ACTIVE AUTOMOTIVE SUSPENSIONS
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THE INFLUENCE OF MAGNETO-RHEOLOGICAL FLUID TIME RESPONSE ON THE PERFORMANCE OF SEMI-ACTIVE AUTOMOTIVE SUSPENSIONS

机译：磁流变流体时间响应对半主动汽车悬架性能的影响

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In recent years the automotive industry has been working towards intelligent suspension systems that adapt to various road conditions to provide a superior ride and improved road handling. So called semi-active devices, in particular smart fluid dampers, are a viable method of implementing such a system. Despite the fact that magnetorheological (MR) dampers have been used in a number of commercially produced vehicles to date, there is little published information on the control of such devices. Building upon a successful modelling approach developed initially for electrorheological (ER) dampers at the University of Sheffield, a computational model was developed and implemented to simulate the behavior of an MR damper. A proportional force feedback control methodology was adopted and applied to the model with the intention of linearizing the output response. The smart fluid damper is therefore forced to behave in a manner equivalent to a linear damper, with the advantage of having a controllable viscous damping coefficient. Whereas previous research has almost exclusively concentrated upon the controller gain and its influence on the range of linearization which is possible to achieve, this investigation focuses on the time response of the MR fluid and its profound impact on the ability of the control method to linearize the output. Results will be presented which show that the fluid time response introduces a high frequency oscillation into the force/velocity output responses. Simultaneously, at higher excitation frequencies non-linear output responses will be demonstrated. As the fluid time response increases, the oscillations seen at low frequencies reduce but conversely the non-linear output of even moderate excitation frequencies becomes apparent. This result shows the need for a compromise between a larger range of controllability with the introduction of noise at low frequencies, or a smaller, yet noise-free range of controllability. This result may have significance when considered in the wider context of smart fluid applications. The instability and long-term degradation of smart fluids alongside other smart fluid phenomena such as 'in-use fluid thickening' indicate that the fluid time response is apt to change as the fluid is used. With a control system which has been demonstrated to be sensitive to fluid time response this change would of course be detrimental. The authors hope to highlight fluid time response as an important consideration in the design of smart fluid control systems.
机译：近年来，汽车行业一直在努力开发能够适应各种路况的智能悬架系统，以提供出色的行驶性能并改善道路处理。所谓的半主动装置，特别是智能流体阻尼器，是实现这种系统的可行方法。尽管迄今为止已经在许多商业生产的车辆中使用了磁流变（MR）阻尼器，但是关于这种装置的控制的公开信息很少。基于最初在谢菲尔德大学为电流变（ER）阻尼器开发的成功建模方法，开发并实施了计算模型来模拟MR阻尼器的行为。采用比例力反馈控制方法并将其应用于模型，以使输出响应线性化。因此，智能流体阻尼器被迫以等效于线性阻尼器的方式工作，其优点是具有可控制的粘性阻尼系数。尽管先前的研究几乎完全集中在控制器增益及其对可能实现的线性化范围的影响上，但本研究着眼于MR流体的时间响应及其对控制方法线性化MR的能力的深刻影响。输出。将显示结果，该结果表明流体时间响应在力/速度输出响应中引入了高频振荡。同时，在较高的激励频率下，将显示非线性输出响应。随着流体时间响应的增加，在低频处观察到的振荡会减少，但相反，即使是中等激励频率的非线性输出也会变得明显。该结果表明需要在较大范围的可控制性与低频噪声的引入之间或较小的但无噪声的可控制性范围之间做出折衷。当在智能流体应用的更广泛背景下考虑时，该结果可能具有重要意义。智能流体的不稳定性和长期降解以及其他智能流体现象（例如“使用中的流体稠化”）表明，随着使用流体，流体时间响应易于发生变化。对于已经证明对流体时间响应敏感的控制系统，这种变化当然是有害的。作者希望强调流体时间响应是智能流体控制系统设计中的重要考虑因素。

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