Unlike conventional mechanisms, compliant mechanisms produce the desired deformations by exploiting elastic strain and do not need, therefore, moving parts. The number of degrees of freedom of a conventional mechanism, also called mobility, is the number of independent coordinates needed to define a configuration of the mechanism. Due to the different operating principle, such definition of degree of freedom or mobility cannot be directly applied to compliant mechanisms. While those terms are not able to denote a property of a given compliant mechanism, they are meaningful when applied to the design of a compliant mechanism. Compliant mechanisms are, however, mostly seen as elastic structures, for which the term degree of freedom is used in a different meaning. In order to avoid ambiguities, the term pseudo-mobility (already introduced in previous published work) will be used to denote the number of scalar parameters needed to identify one single desired deformation, i.e. one single deformation for which the compliant mechanism is designed. Many synthesis approaches exist for compliant mechanisms with single pseudo-mobility (commonly referred to as "single degree of freedom mechanisms"). In the case of compliant mechanisms with multiple pseudo-mobility (multiple-degree of freedom mechanisms), only synthesis approaches for relatively simple mechanisms exist so far, while systems for more complex tasks like shape adaptation are not covered. In addition, only certain cases of transverse loads are included in the synthesis with these approaches. In this paper, a novel optimization algorithm is presented that addresses these two shortcomings. The algorithm is tested on a simple mechanism with one translation and one rotation kinematic degree of freedom, a compliant parallel mechanism for pure translation and a shape-adaptive structure.
翻译:与常规机制不同,合规机制通过利用弹性压力产生预期的变形,因此不需要移动部件。常规机制的自由度,也称为流动性,是确定机制配置所需的独立坐标数。由于不同的操作原则,这种自由或流动程度的定义不能直接适用于合规机制。虽然这些术语不能表示特定合规机制的属性,但在应用到一个合规机制的设计时,这些术语是有意义的。兼容机制大多被视为弹性结构,其自由程度被不同地使用。为避免模糊,将使用假流动(在先前出版的工作中已经采用)这一术语,以说明确定机制配置的单一理想变形所需的数量。尽管这些术语不能表示一个单一的合规机制的属性,但在采用单一伪流动机制的设计时,这些兼容机制具有许多综合方法(通常称为“自由机制的单一程度 ” ) 。在采用一个简单化的翻译机制时,在一种简单化的变形结构中,这些变形机制只是一种简单的变形机制,这些变形机制是比较复杂的变形机制。这些变形机制中,这些变形机制只是一种简单的变形机制。