Kinetostatic Modeling and Optimization of a Novel Horizontal-Displacement Compliant Mechanism

2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Kejia Kong ◽  
Guimin Chen ◽  
Guangbo Hao
Keyword(s):  
Analytical Model ◽  
Compliant Mechanism ◽  
Translational Motion ◽  
Horizontal Displacement ◽  
Nonlinear Finite Element ◽  
Element Simulation ◽  
Nonlinear Analytical Model ◽  
Motion Characteristics ◽  
Constraint Model ◽  
Nonlinear Finite Element Simulation

Abstract This paper presents kinetostatic modeling of a compliant mechanism for translational motion. This mechanism arranges all compliant members in an inverted way, which enables the robustness against beam buckling due to the heavy payload. To enable quick design and analysis of the mechanism, a nonlinear analytical model is then derived based on the chained beam constraint model, which is validated by nonlinear finite element simulation. Geometric parameter optimization is further carried out for desired motion characteristics. Finally, a prototype is fabricated and tested to verify the analytical model.

Construction Simulation of Long-Span Arch Rib Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 871-875
Author(s):  
Wei Feng Tian ◽  
Shui Xing Zhou ◽  
Liang Liang Zhang ◽  
Ayad Thabet Saeed Alghabsha
Keyword(s):  
Simulation Analysis ◽  
Nonlinear Finite Element ◽  
Construction Simulation ◽  
Long Span ◽  
Element Simulation ◽  
Cable Forces ◽  
Sequence Simulation ◽  
Nonlinear Finite Element Simulation ◽  
General Method ◽  
Main Construction

Non-framework cable hoisting erection is a main construction method for long-span arch rib bridge. Geometric nonlinearity is a key problem in the construction simulation of this type of bridge. A general method for construction sequence simulation of long-span arch rib bridge is proposed, and stage-by-stage construction of the Daning River Bridge is simulated. Comparisons of cable forces and finial arch rib geometry between results obtained from actual measurements and those from the simulation analysis are presented. Results showed that the developed method can be used effectively for nonlinear finite-element simulation of long-span arch rib bridge construction.

scholarly journals Novel Ball Head Screw and Screwdriver Design for Implant-Supported Prostheses With Angled Channels: A Finite Element Analysis

2018 ◽  
Vol 44 (6) ◽  
pp. 416-422 ◽  
Author(s):  
Oriol Farré-Berga ◽  
Iñaki Cercadillo-Ibarguren ◽  
Alba Sánchez-Torres ◽  
Carles Domènech-Mestres ◽  
F. Javier Gil ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Primary Objective ◽  
Nonlinear Finite Element ◽  
Element Analysis ◽  
Optimal Geometry ◽  
Element Simulation ◽  
Secondary Objective ◽  
Nonlinear Finite Element Simulation

The primary objective of this study was to design the optimal geometry of a novel screwdriver, create the grooves on a ball head screw, and demonstrate its resistance to a torque of up to 40 Ncm at angulations of 0°, 15°, and 30° by using nonlinear finite element analysis. A secondary objective was to create a foolproof, easily recognizable system. The grooved ball head screw and geometry of the screwdriver, functioning from an angulation of 0° to 30°, was generated using Pro-ENGINEER Wildfire 5.0 software. Static structural analyses among bodies in contact were performed at different angles of 0°, 15°, and 30° at a torque of 20 Ncm and 40 Ncm using nonlinear finite element simulation by means of ANSYS 12.0. The maximum stress supported by the ball head screw and screwdriver was similar at 20 Ncm and 40 Ncm. Although greater deformations were found at 40 Ncm, these were small and might not affect the performance of the system. Further, the rupture torque value for the M2 connection was 55 Ncm for 0° and 30°, and 47.5 Ncm for 15°. Numerical simulation showed that the ball head system design can achieve the mechanical strength requirements expected for screws used in implant-supported restorations at an angulation of up to 30°. Finite element analysis showed this novel ball head screw and screwdriver system to be a good solution for angled screw channels in implant-supported prostheses.

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