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Determination of coefficient of friction for a novel bed mechanism
Engineering Research Express Pub Date : 2021-08-02 , DOI: 10.1088/2631-8695/ac1726
Atul B Andhare , Anil M Onkar

In all the mechanical systems it is important to know the amount of friction and the actual torque required to drive the system. In this context, this manuscript discusses a simple, practical approach for estimating the coefficient of friction and the operating torque in a mechanism used for a novel bed with commode. The commode is brought in useable position by a mechanism which moves the bed platform down and then horizontally away from the commode opening and vice versa. This article presents the design of platform mechanism, estimation of operating torque using a specially designed setup and calculation of the coefficient of friction using basic mechanics. The results show that the coefficient of friction in the mechanism decreases with increase in the load on it. A mean value of coefficient of friction of 0.2396 is estimated from the trials. Calculating the torque to operate the mechanism using the mean value of friction results in some error in the torque values and the error is within 10% of the actual values. Thus, the mean coefficient of friction can be used conveniently for estimating the torque in this mechanism. This friction and torque estimation will be useful for determination of crank sizes for manual turning of screw and motor rating for automatic operation of the mechanism.



中文翻译:

一种新型床机构摩擦系数的测定

在所有机械系统中,了解驱动系统所需的摩擦量和实际扭矩非常重要。在这种情况下,本手稿讨论了一种简单实用的方法,用于估计用于带马桶的新型床的机构中的摩擦系数和操作扭矩。通过将床平台向下移动然后水平远离马桶开口的机构,将马桶置于可用位置,反之亦然。本文介绍了平台机构的设计、使用专门设计的设置估计操作扭矩以及使用基本力学计算摩擦系数。结果表明,机构中的摩擦系数随着其上载荷的增加而减小。根据试验估计摩擦系数的平均值为 0.2396。使用摩擦的平均值计算操作机构的扭矩会导致扭矩值存在一些误差,误差在实际值的 10% 以内。因此,可以方便地使用平均摩擦系数来估计该机构中的扭矩。这种摩擦和扭矩估计将有助于确定手动转动螺钉的曲柄尺寸和用于机构自动操作的电机额定值。

更新日期:2021-08-02
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