IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1784-1791   

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L. Zhao, Y. Yu, C. Zhou and S. Mao
( Received: April 22, 2017 – Accepted in Revised Form: September 08, 2017 )

Abstract    The damping ratio of chassis suspension is a key parameter for damping matching of in-wheel motor vehicles (IWMVs). Because the motor is attached to the driving wheel, the initial design method of the damping ratio for traditional cars is not entirely suitable for IWMVs. This paper proposes an innovative initial design method of the damping ratio for IWMVs. Firstly, a traveling vibration model of occupant-vehicle-road (OVR) for IWMVs is established. The model involves the occupant, cushion, suspension, in-wheel motor, road, and running speed. Secondly, on the basis of the model, using a special form of infinite integral, a mathematical expression of the occupant root-mean-square (RMS) acceleration is derived. Thirdly, based on the RMS optimization criterion for ride comfort, an 8 order polynomial equation about the suspension optimal damping ratio is deduced. Subsequently, through factors analysis, the change principles of the optimal damping ratio versus vehicle parameters are unveiled. Finally, the reliability of the optimal damping ratio is validated by test. The relative deviation of the calculated optimal damping ratio and the tested damping ratio is 5.4%. The results show that the proposed optimal damping ratio can effectively guide the suspension damping matching for IWMVs.


Keywords    vehicle, in-wheel motor, test verification, damping ratio


چکیده    نسبت میرایی تعلیق شاسی یک پارامتر کلیدی برای تطبیق میرایی موتورهای چرخ دنده ای (IWMV) می باشد. از آنجا که موتور به چرخ متصل است، روش طراحی اولیه نسبت میرایی اتومبیل های سنتی به طور کامل برای IWMV مناسب نیست. این مقاله روشی برای طراحی اولیه ابتکاری نسبت میرایی برای IWMV ها ارائه می دهد. در ابتدا، یک مدل ارتعاشات جابجایی وسیله نقلیه جاده ای (OVR) برای IWMV ایجاد شده است. مدل شامل ساکنان، کوسن، تعلیق، موتور درایو، جاده و سرعت حرکت است. ثانیا، بر اساس مدل، با استفاده از یک فرم خاص انتگرال بی نهایت، عبارت ریاضی متوسط مربعات ریشه (RMS) شتاب حاصل می شود. سوم، بر اساس معیار بهینه سازی RMS برای راحتی سواری، یک معادله چند جمله ای مرتبه 8 در مورد نسبت خمش مطلوب تعلیق محاسبه می شود. پس از آن، از طریق تجزیه و تحلیل عوامل، اصول تغییر نسبت میرایی بهینه نسبت به پارامترهای خودرو نمایش داده می شود. در نهایت، قابلیت اطمینان نسبت میرایی مطلوب با آزمون تایید می شود. انحراف نسبی نسبت به محدوده مطلوب محاسبه شده و نسبت میرایی آزمایشی 4/5 درصد است. نتایج نشان می دهد که نسبت میرایی بهینه مطلوب می تواند راهنمای خوبی برای تطبیق میرایی تعلیق برای IWMV ها باشد.


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