Finite Element Analyses on Dynamic Responses of a Portable Instrument Subjected to Drop/Impact

2012 ◽  
Vol 9 (1) ◽  
pp. 1-7
Author(s):  
Chieh Kung ◽  
Shin-Yong Chen ◽  
Te-Tan Liao
Keyword(s):  
Finite Element ◽  
Drop Impact ◽  
Dynamic Responses ◽  
Portable Instrument ◽  
Finite Element Analyses

Study on Dynamics Characteristics of Concrete Floating Slab Track in Urban Track

2006 ◽  
Vol 302-303 ◽  
pp. 700-705 ◽  
Author(s):  
Gao Liang ◽  
Ke Ming Yin ◽  
Ge Yan Zhang
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Dynamic Responses ◽  
Finite Element Analyses ◽  
Analysis Model ◽  
Slab Track ◽  
Stiffness And Damping

In this paper, in order to do research on the characteristics of reducing vibration and declining noise of concrete floating slab track, the vertical dynamic analysis model of vehiclefloating slab track is established with the use of finite element analyses method. By using this model, dynamic responses of floating slab track are studied under different conditions of train’s speed, stiffness and damping of infrastructure, structure size, etc. On the basis of this research, some suggestions for design of floating slab track are put forward.

scholarly journals Dynamic responses of concrete-faced rockfill dam due to different seismic motion input methods

2018 ◽  
Vol 14 (10) ◽  
pp. 155014771880468 ◽  
Author(s):  
Bin Xu ◽  
Yang Zhou ◽  
Chenguang Zhou ◽  
Xianjing Kong ◽  
Degao Zou
Keyword(s):  
Finite Element ◽  
Safety Evaluation ◽  
Energy System ◽  
Dynamic Responses ◽  
Finite Element Analyses ◽  
Seismic Safety ◽  
Input Method ◽  
Seismic Motion ◽  
Rockfill Dam ◽  
Seismic Safety Evaluation

The concrete-faced rockfill dam valley foundation was considered as an open energy system and a reasonable non-uniform seismic motion input method was applied to the dynamic analysis of a concrete-faced rockfill dam based on the generalized plastic model. First, the corresponding program was validated by means of the scattering question of an idealized semicircle valley. Subsequently, the seismic elasto-plastic finite element analyses were performed to compare and investigate the performances of a concrete-faced rockfill dam under different seismic motion input methods. The results show that the dynamic responses of the concrete-faced rockfill dam are decreased by 10%–30% approximately with the use of non-uniform seismic motion input method. As a result, the traditional uniform seismic motion input method would overestimate the responses of the dam. From the perspective of seismic safety evaluation, the overestimations would disturb the reasonable assessment of the aseismic capacity of the dam. Moreover, the slope stability analysis results might be conservative and unreasonable due to overestimating the accelerations during the earthquake.

Design of flexure revolute joint based on compliance and stiffness ellipsoids

2021 ◽  
pp. 095441002110169
Author(s):  
Jing Zhang ◽  
Hong-wei Guo ◽  
Juan Wu ◽  
Zi-ming Kou ◽  
Anders Eriksson
Keyword(s):  
Finite Element ◽  
Single Point ◽  
Synthesis Method ◽  
Nonlinear Finite Element ◽  
Finite Element Analyses ◽  
Rotational Stiffness ◽  
Rotational Angle ◽  
Parameterized Model ◽  
Flexure Joints ◽  
Translational Stiffness

In view of the problems of low accuracy, small rotational angle, and large impact caused by flexure joints during the deployment process, an integrated flexure revolute (FR) joint for folding mechanisms was designed. The design was based on the method of compliance and stiffness ellipsoids, using a compliant dyad building block as its flexible unit. Using the single-point synthesis method, the parameterized model of the flexible unit was established to achieve a reasonable allocation of flexibility in different directions. Based on the single-parameter error analysis, two error models were established to evaluate the designed flexure joint. The rotational stiffness, the translational stiffness, and the maximum rotational angle of the joints were analyzed by nonlinear finite element analyses. The rotational angle of one joint can reach 25.5° in one direction. The rotational angle of the series FR joint can achieve 50° in one direction. Experiments on single and series flexure joints were carried out to verify the correctness of the design and analysis of the flexure joint.

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