Synthesis and Steady-State Analysis of High-Speed Elastic Cam-Actuated Linkages With Fluctuated Speeds by a Finite Element Method

1997 ◽  
Vol 119 (3) ◽  
pp. 395-402 ◽  
Author(s):  
Hsin-Ting J. Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Iterative Procedure ◽  
High Speed ◽  
Damping Ratio ◽  
The Finite Element Method ◽  
Steady State Analysis ◽  
Cam Profile ◽  
Design Speed ◽  
Element Method

A cam driving a lumped inertia through an elastic slider-crank follower linkage with its actuator, a D. C. motor, has been considered in this work. An iterative procedure utilizing the finite element method developed by Midha et al. (1978) is used to synthesize the cam profile to produce a desired output motion at a given design speed and damping ratio. The elastic deflections induced by the large inertia of the linkage operating at a fluctuated high speed of the driving cam are taken into account in synthesizing the cam profile. Responses of the synthesized linkages are simulated and found to be satisfactory at the design conditions.

Synthesis and Steady State Analysis of High-Speed Elastic Cam-Actuated Linkages by a Finite Element Method

1993 ◽  
Vol 115 (4) ◽  
pp. 800-807 ◽  
Author(s):  
Hsin-Ting J. Liu ◽  
D. R. Flugrad
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Iterative Procedure ◽  
High Speed ◽  
The Finite Element Method ◽  
Linear Ordinary Differential Equations ◽  
Periodic Linear ◽  
Cam Profile ◽  
Design Speed ◽  
Element Method

A cam driving a lumped inertia through an elastic slider-crank follower linkage with a curved beam coupler is considered. An iterative procedure utilizing the finite element method developed by Midha et al. (1978) is used to synthesize the cam profile to produce a desired output motion at a given design speed and damping coefficient. Nonlinear terms are neglected producing inhomogeneous, periodic, linear, ordinary differential equations. Responses of the synthesized linkages are simulated and found to be satisfactory at the design conditions.

Synthesis and Steady State Analysis of High-Speed Elastic Cam Follower Linkages by a Finite Element Method

1991 ◽  
Author(s):  
Hsin-Ting J. Liu ◽  
Donald R. Flugrad
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
The Finite Element Method ◽  
Linear Ordinary Differential Equations ◽  
Periodic Linear ◽  
Cam Follower ◽  
Cam Profile ◽  
Design Speed ◽  
Element Method

Abstract A cam driving a lumped inertia through an elastic slider-crank follower linkage with a curved beam coupler is considered. An iterative procedure utilizing the finite element method developed by Midha et al. (1978) is used to synthesize the cam profile to produce a desired output motion at a given design speed and damping coefficient. Nonlinear terms are neglected producing inhomogeneous. periodic, linear, ordinary differential equations. Response of the synthesized linkages are simulated and found to be satisfactory at the design conditions.

scholarly journals Design and Structural Analysis of a SWATH type vessel using the Finite Element Method and its response to Slamming events

2020 ◽  
Vol 14 (27) ◽  
pp. 55-66
Author(s):  
Hugo Leonardo Murcia Gallo ◽  
Richard Lionel Luco Salman ◽  
David Ignacio Fuentes Montaña
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
Load Condition ◽  
Structural Response ◽  
Water Area ◽  
The Finite Element Method ◽  
Short Period ◽  
Classification Society ◽  
Element Method

The main objective of this study is to analyze the structural response of a boat during a slamming event using the Finite Element Method in a Small Water Area Twin Hull (SWATH) type boat.  In the mentioned load condition, the acceptance criteria established by a classification society must be fulfilled, taking into account the areas where this event affects the structure such as the junction deck, the pontoons and other structural members established by the standard, all this generated by the high pressure loads in the ship's structure in a very short period of time being an element of study in this type of vessels, as long as they are within the range of high speed vessels. Among the main results of this study were the deformations and stresses in the structure obtained under the reference parameters of the classification society.

Calculation of Heat Distribution in High Speed Cutting Based on Finite Element Method

2009 ◽  
Vol 626-627 ◽  
pp. 249-254
Author(s):  
Wang Yu Liu ◽  
X.K. Liu ◽  
Jing Li ◽  
Yong Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
Experimental Result ◽  
Analytic Method ◽  
Heat Distribution ◽  
Analytic Model ◽  
The Finite Element Method ◽  
High Speed Cutting ◽  
Element Method

Combined the analytic method with the finite element method, the data necessary for calculating the heat distribution ratio for high speed cutting was mined first, and the experimental result was used to validate the authenticity of finite element modeling. Then, the ratio of heat distribution for high speed cutting based on the analytic model was obtained by customizing the special subroutine developed by the authors, which provides a new method for calculating the heat distribution.

Kinematic Analysis of Flexible Geneva Mechanisms

1988 ◽  
Vol 12 (2) ◽  
pp. 115-118
Author(s):  
R.G. Fenton ◽  
Wu Zhenbiao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Kinematic Analysis ◽  
High Speed ◽  
The Finite Element Method ◽  
Unit Force ◽  
Dynamic Component ◽  
Interactive Process ◽  
Unit Normal ◽  
Element Method

The deformation of Geneva wheels resulting from a unit normal unit force applied at the point of contact between the driving pin and the wheel is determined using the finite element method. The dynamic and static forces driving the Geneva wheel, and wheel deformations are computed. The output of the flexible Geneva wheel is determined with the help of an interpolating polynomial. An interactive process is used to update the dynamic component of the force based on the computed wheel acceleration values. Results indicate that the output of high speed flexible Geneva wheels is different from that obtained for Geneva mechanism having non-deforming links.

scholarly journals The Timber Floor Seismic Design by Means Finite Element Method

2019 ◽  
Vol 5 (7) ◽  
pp. 1557-1565
Author(s):  
Abdoullah Namdar ◽  
Shan Saimai
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Seismic Design ◽  
Input Data ◽  
Damping Ratio ◽  
Seismic Load ◽  
The Finite Element Method ◽  
Load Response ◽  
Element Method

To improve accuracy results of numerical analysis, the finite element method software needs to use appropriately with considering accurate input data. Among several factors in realistic and economical seismic structural design, the damping ratio needs to be investigated as a calculated and input data in numerical analysis. In the present study, the effect of accurate damping ratio on timber floor seismic design has numerically been examined. The 6 first modes from a series of eigenvalues were selected to calculate natural frequency and damping ratio. The seismic results with and without applied calculated damping ratio were compared. The strain, displacement, and seismic load response are interpreted. The numerical analysis results were showed that the higher nonlinear displacement occurs in timber floor when the damping ratio was modified in numerical modeling. It was found that the floor seismic design is more critical compared to a column in select accurate damping ratio. The damping ratio has highly effect on timber floor seismic design.

scholarly journals The oscillating and electrostatic characteristics of microelectromechanical system cantilever structure analyzed based on the air gap domain

2018 ◽  
Vol 37 (4) ◽  
pp. 725-747 ◽  
Author(s):  
Jianlian Cheng ◽  
Kai Li ◽  
Zhuang Zhang ◽  
Yufeng Gu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Study ◽  
Damping Ratio ◽  
Electrostatic Actuation ◽  
Compact Model ◽  
Squeeze Film ◽  
The Finite Element Method ◽  
Cantilever Structure ◽  
Element Method

Extensive modeling and simulation of the damping phenomenon, electrostatic actuation, and structural vibration analysis are performed. The governing partial differential equations of cantilever plate are obtained, and the resonant frequencies are calculated from the equilibrium equations. The damping forces of squeeze film are analyzed by obtaining the damping ratio and spring constant. Electrostatic actuation is applied to oscillate the cantilever to ensure that the displacement of the plate is above the thermal noise floor. Electrostatic actuating forces, displacement, and capacitance are calculated both numerically and analytically from the Poisson’s equations. Squeeze film damping effects naturally occur if structures are subjected to loading situations such that a very thin film of fluid is trapped within structural joints, interfaces, etc. An accurate estimate of squeeze film effects is important to predict the performance of dynamic structures. Squeeze film effects are simulated by the finite element method. The accuracy of the compact model is studied by comparing its response to the numerical results calculated with the finite element method. The agreement is very good in a wide frequency band. The numerical study and the compact model are directly applicable in predicting the damping force and damping factors of squeeze film.

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