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Planar parallel three-degrees-of-freedom (3-DOF) nanopositioning systems have been widely applied in scanning probe microscopy, micro-/nanomanipulation, nanoimprint lithography, and precision machining. Two effective optimization approaches are proposed to enhance the system performance in this paper. First, seven indexes are involved in modeling a nanopositioning platform to evaluate the mechanism...
The flexure hinge is a key component for designing compliant mechanisms that have been widely used in precision engineering which high positioning accuracy is demanded. This paper presents a systematic method for designing flexure hinges by using the topology optimization method. An optimization model is developed by equally considering the following three objectives: (I) maximizing the compliance...
Ulti-material compliant mechanisms can enhance the performances of monolithic compliant mechanisms by integrating multiple materials. This paper will conduct systematic research on designing monolithic compliant mechanisms made of multiple materials. A new simple approach called Parallel Optimization Tactic (POT) is presented. POT is a optimization method formalizing the process of propagating multi-material...
This study is proposed to solve the compliant mechanism de facto hinge (point flexure) issue by developing a new problem formulation. The main idea is to introduce an additional objective function which is to minimize the distance between the outputs of two types finite element analysis (FEA). A ratio formed formulation is developed based on the method and examined within the continuum type topology...
Despite its remarkably fast development in the past few years, the technology of invisibility cloaking is still facing many serious bottlenecks, e.g. the bandwidth, the superluminal limitation, dispersion, loss, etc. In this paper, we experimentally demonstrated an alternative approach of invisibility cloaking that can combine technical advantages of all current major cloaking strategies in a unified...
This paper presents the problem formulation and design of compliant microgripper. The microgripper includes a fixed jaw and a movable jaw for engaging opposite surfaces of the article. Actuation of the compliant mechanism drives the movable jaw toward or away from the fixed jaw to close or open the jaws relative to one another. The travel path of the movable jaw is generally at right angles to the...
In this paper, topology optimization is addressed for compliant mechanisms with anisotropic composite materials. The equivalent elastic module and off-axis stiffness of composite materials are first analyzed using micro-mechanics based on anisotropic elasticity theory; the model of topology optimization of compliant mechanisms made of anisotropic materials is then built by taking the maximum output...
Based on thermo-elastic finite element theory, the equivalent nodal thermal load is analyzed, and thermal load of each node load as a physical force is applied to the elastic field. The model of structural topology optimization of continuum structure considering thermo-mechanical coupling is established using the minimum strain energy as the goal. The solid isotropic material with penalization approach...
The paper is concerned with the layout optimization of continuum structures using topology optimization. The objective of the optimization is a maximization of the magnitude of the fundamental simple and multiple eigenfrequencies of linearly elastic structures without damping. SIMP (solid isotropic material with penalization scheme) is used to indicate the dependence of material modulus upon the element...
A novel endless polarization control algorithm based on simulated annealing (SA) algorithm is proposed. The application of the SA algorithm in a fast feedback polarization controller (PC) constructed by four electro-optic ceramic variable waveplates for the continuous conversion of the state of polarization (SOP) is presented. The experiment results show that the fluctuation of the light intensity...
The knowledge of the workspace of a robotic multifingered hand is crucial in order to plan grasp and dexterous manipulation, as in the cases of other robotic systems. In this paper, we propose a numerical approach to compute and visualize the workspace of a multifingered robotic hand manipulating an object in the planar case. Based on feasibility analysis of grasps, the proposed approach uses a numerical...
A new structural topology algorithm based on reliability is proposed. Moreover, the mathematical model of topology optimization based on the reliability for continuous structures is developed, in which the level set function is taken as design variables, minimization of the compliance is taken as objective function, reliability constraint is included. For solving reliability-based topology optimization...
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