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Direct stiffness method
About: Direct stiffness method is a research topic. Over the lifetime, 2584 publications have been published within this topic receiving 53131 citations.
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TL;DR: In this article, a variable stiffness mechanism was proposed for the design of variable stiffness dielectric elastomer actuator (VSDEA), which combines a flexible strip with a DEA in a dielectoric elastome minimum energy structure.
Abstract: In this paper, a novel variable stiffness mechanism is proposed for the design of a variable stiffness dielectric elastomer actuator (VSDEA) which combines a flexible strip with a DEA in a dielectric elastomer minimum energy structure The DEA induces an analog tuning of the transverse curvature of the strip, thus conveniently providing a voltage-controllable flexural rigidity The VSDEA tends to be a fully flexible and compact structure with the advantages of simplicity and fast response Both experimental and theoretical investigations are carried out to reveal the variable stiffness performances of the VSDEA The effect of the clamped location on the bending stiffness of the VSDEA is analyzed, and then effects of the lengths, the loading points and the applied voltages on the bending stiffness are experimentally investigated An analytical model is developed to verify the availability of this variable stiffness mechanism, and the theoretical results demonstrate that the bending stiffness of the VSDEA decreases as the applied voltage increases, which agree well with the experimental data Moreover, the experimental results show that the maximum change of the relative stiffness can reach about 8880% It can be useful for the design and optimization of active variable stiffness structures and DEAs for soft robots, vibration control, and morphing applications
19 citations
TL;DR: In this paper, a finite element formulation for simulating high speed rolling is presented, which does not require the assemblage and inversion of a global stiffness matrix and can be solved node-by-node with explicit time integration.
19 citations
TL;DR: In this article, a modified stiffness matrix method for the dynamic response analysis of a three-dimensional poroelastic layered half space subject to internal concentrated loads is presented, where the convergence problem due to the improper integral can be addressed with sources and receivers at similar or at the same depth and a fictitious surface does not need to be introduced as in the traditional method.
Abstract: This paper presents a new modified stiffness matrix method for the dynamic response analysis of a three-dimensional poroelastic layered half space subject to internal concentrated loads. This three-dimensional problem can be simplified as two two-dimensional problems consisting of the in-plane response and the anti-plane response. Similar to the principle of displacement method in structural mechanics, firstly, the top and bottom surfaces of a loaded layer are fixed, and the reaction forces at two “fixed ends” can be obtained using the superposition of the particular and homogeneous solution. Secondly, the displacement at the layer interface can be obtained using a direct stiffness method. In the loaded layer, the Green׳s function is decomposed into the particular solution, the homogeneous solution and the reaction solution, and the particular solution can be replaced by the analytical solution for the poroelastic full space. With this technique, the convergence problem due to the improper integral can be addressed with sources and receivers at similar or at the same depth, and a fictitious surface does not need to be introduced as in the traditional method. Finally, the results of the dynamic response of a poroelastic layered half space are presented both in the frequency and time domain.
19 citations
TL;DR: In this paper, the authors examined the role of the integrated force method in analysis, animation and design of aerospace and other products and concluded that it is advisable to use both methods to calculate stress and eliminate errors through comparison.
19 citations
TL;DR: In this paper, the direct boundary element method (DBEM) is used to generate the stiffness properties of the slab thin-plate element and to calculate the internal actions of the building-frame material.
Abstract: The term building frame as defined in this paper, refers to a general flat-plate structural system, comprising thin Kirchoff plates (the floor slabs), which are interconnected by one-dimensional flexural elements (the columns and column walls) of various shapes and layout. The building-frame material is assumed to be linear elastic. A stiffness method for analyzing this structure addresses the full three-dimensional frame and is practical for use either as a design tool or for research. The direct boundary element method (DBEM) is used to generate the stiffness properties of the slab thin-plate element and to calculate the internal actions. Potential applications include stress analysis, and in addition, these numerical procedures permit a more rational basis for studying dynamic behavior, and other types of analysis in which a full building frame structural stiffness model is desirable. The paper is oriented toward a general structural engineering readership.
19 citations