The Helmet Reverse Forming and Static Characteristic Analysis

2013 ◽  
Vol 712-715 ◽  
pp. 1145-1148
Author(s):  
Shi Gang Wang ◽  
Guan Xiong Wu ◽  
Chao Cui ◽  
Xi Bing Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reverse Engineering ◽  
Laser Scanner ◽  
Static Characteristic ◽  
Deformation Analysis ◽  
Test Problems ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Cloud Data

In order to solve irregular product surface quality is difficult to test problems, this paper combined reverse engineering with finite element analysis related technologies, good results have been achieved. Selected the helmet as the research object, introduced the reverse engineering and finite element analysis of the basic methods and ideas. First through the 3D laser scanner for safety helmet surface point cloud data, the data conducted the pretreatment in the Imageware software, and then in UG finished surface reconstruction and materialization process, finally guided the reverse forming helmet entity into Ansys Workbench software to carry on the finite element analysis, through the generation of stress and deformation analysis nephogram to test the sample quality.

Finite Element Analysis of the Shock Absorber for Vehicle

2013 ◽  
Vol 706-708 ◽  
pp. 1361-1364
Author(s):  
Chao Fu Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Modulus ◽  
Internal Pressure ◽  
Shock Absorber ◽  
Structural Features ◽  
Static Characteristic ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis

As for the structural features and the characteristics of fiber-reinforced rubber of a shock absorber for vehicle, this paper mainly focuses on its deformation and static characteristic analysis. A shock absorber whose type is JW2-5202 was analyzed in its performance characteristics of deformation with variations in cord elastic modulus and cord angle. According to the finite element analysis on the load vs. the displacement, and the internal pressure vs. the displacement, the results are in accordance with the test ones.

Study on the Static and Dynamic Characteristics of Linear Rolling Guideway

2014 ◽  
Vol 490-491 ◽  
pp. 342-346
Author(s):  
Yao Man Zhang ◽  
Guang Xiao Yang ◽  
Ren Jun Gu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Static Characteristic ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Dynamic Finite Element Analysis ◽  
Calculation Results ◽  
Nc Machine ◽  
Rolling Guide ◽  
Analysis Models

Linear rolling guides are widely used in the NC machine tool, and usually the NC machine tool's characteristics shall been influenced by the characteristics of the guide greatly. The HSR series of liner rolling guides are taken as the research object of the paper. The methods of constructing the dynamic finite element analysis models are studied. The contact element is applied to simulate the characteristics of junction surfaces during the static characteristic analysis. The spring damping element is applied during the dynamic characteristic analysis. The static stiffness, natural frequencies, modal shapes and other characteristics are obtained by finite element analysis. Then the experiments of linear rolling guide are carried out and verified the model that had been built and calculation results of finite element analysis.

Finite Element Analysis in the Characteristics of Ostrich Foot Toenail Traveling on Sand

2013 ◽  
Vol 461 ◽  
pp. 213-219 ◽  
Author(s):  
Rui Zhang ◽  
Hai Bao Liu ◽  
Si Hua Zhang ◽  
Gui Yin Zeng ◽  
Jian Qiao Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reverse Engineering ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Point Clouds ◽  
Flow Limitation ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Engineering Technology

The ostrich foot toenail plays a crucial role in the process of ostrich foot traveling on sand. 3D laser scanner was used to measure the three-dimensional point clouds of ostrich foot toenail surface morphology, and the three-dimensional model of ostrich foot toenail was reconstructed by using reverse engineering technology. The finite element analysis in the interactions between ostrich foot toenail and sand was implemented by Abaqus and Hypermesh. The quasi-static analytical results of ostrich foot toenail inserting the sands showed that the groove structure of the toenail had a better sand fixation effects, the tiptoe structure was conducive to insert into the sands, and the inverted triangular structure of the toenail had the weak disturbance on the sands which produced the less resistance of the toenail inserting the sands. According to the velocity and the stress fields in the process of the ostrich foot toenail dynamically traveling on sand, ostrich foot toenail tiptoe could help to improve the thrust of traveling on sand, the groove area of the toenail played the effects of sand fixation and flow limitation in the process of ostrich foot toenail traveling on sand. Keywords: ostrich foot toenail, reverse engineering, model reconstruction, finite element simulation, sand fixation and flow limitation.

Finite Element Analysis and Optimization of Long-Span Gantry NC Machining Center Structure

2011 ◽  
Vol 346 ◽  
pp. 379-384
Author(s):  
Shu Bo Xu ◽  
Yang Xi ◽  
Cai Nian Jing ◽  
Ke Ke Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Method ◽  
Dynamic Performance ◽  
Plate Thickness ◽  
Element Model ◽  
Wall Structure ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Dynamic Performance Analysis

The use of finite element theory and modal analysis theory, the structure of the machine static and dynamic performance analysis and prediction using optimal design method for optimization, the new machine to improve job performance, improve processing accuracy, shorten the development cycle and enhance the competitiveness of products is very important. Selected for three-dimensional CAD modeling software-UG NX4.0 and finite element analysis software-ANSYS to set up the structure of the beam finite element model, and then post on the overall structure of the static and dynamic characteristic analysis, on the basis of optimized static and dynamic performance is more superior double wall structure of the beam. And by changing the wall thickness and the thickness of the inner wall, as well as the reinforcement plate thickness overall sensitivity analysis shows that changes in these three parameters on the dynamic characteristics of post impact. Application of topology optimization methods, determine the optimal structure of the beam ultimately.

On the comprehensive static characteristic analysis of a translational bistable mechanism

2016 ◽  
Vol 230 (20) ◽  
pp. 3803-3817 ◽  
Author(s):  
Guangbo Hao ◽  
John Mullins
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Negative Stiffness ◽  
Beam Length ◽  
Rotational Stiffness ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Primary Motion ◽  
Bistable Mechanism ◽  
Inclined Angle

Bistable mechanisms have two stable positions and their characteristic analysis is much harder than the traditional spring system due to their postbuckling behaviour. As the strong nonlinearity induced by the postbuckling, it is difficult to establish a correct model to reveal the comprehensive nonlinear characteristics. This paper deals with the in-plane comprehensive static analysis of a translational bistable mechanism using nonlinear finite element analysis. The bistable mechanism consists of a pair of fixed-clamped inclined beams in symmetrical arrangement, which is a monolithic design and works within the elastic deformation domain. The displacement-controlled finite element analysis method using Strand7 is first discussed. Then the force–displacement relation of the bistable mechanism along the primary motion direction is described followed by the detailed primary translational analysis for different parameters. A simple analytical (empirical) equation for estimating the negative stiffness is obtained, and experimental testing is performed for a case study. It is concluded that (a) the negative stiffness magnitude has no influence from the inclined angle, but is proportional to the product of the Young’s modulus, beam depth, and cubic ratio for in-plane thickness to the beam length; (b) the unstable position is proportional to the product of the beam length and the Sine function of the inclined angle, and is not affected by the in-plane thickness and the material (or the out-of-plane thickness). The in-plane off-axis (translational and rotational) stiffness is further analysed to show the stiffness changes over the primary motion and the off-axis motion, and a negative rotational stiffness domain has been obtained.

Modeling and Calculation of Dynamic Performances of NC Machine Tool Considering Linear Rolling Guideway

2009 ◽  
Vol 16-19 ◽  
pp. 510-514 ◽  
Author(s):  
Yao Man Zhang ◽  
Zhi Kun Xie ◽  
Yong Xian Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tool ◽  
Static Characteristic ◽  
Element Analysis ◽  
Nc Machine Tool ◽  
The Finite Element Analysis ◽  
Nc Machine ◽  
Dynamic Performances ◽  
Analysis Models

The linear rolling guideway is one of the most essential parts of the machine tool. So it is very important to analyze the dynamic-static characteristic of the machine tool consider rolling guideway and to study the effect on machinery function. The paper’s research is based on a NC machine tool produced by a certain plant of machine tools. Methods of simulating the rolling guideway support are studied, and the configuration of the spring damper elements of the bearing supports are also studied, and the finite element analysis on the CKS6125 machine tool has been made to confirm its dynamic characteristics. Then the finite element analysis models are validated by some experiments.

Analysis of High-Speed Railway Roadbed Settlement in Seasonally Frozen Regions

2012 ◽  
Vol 204-208 ◽  
pp. 1740-1743 ◽  
Author(s):  
Gang Qiang Shi ◽  
Yu Zhi Zhang ◽  
Shi Yun Zhao ◽  
Lu Xin Zhang ◽  
Bao Chen Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
High Speed Railway ◽  
Finite Element Analysis Model ◽  
Seasonally Frozen Regions ◽  
Passenger Dedicated Line

Relying on the roadbed in seasonally frozen region of Harbin-Dalian passenger dedicated line，a finite element analysis model was built to study the changing rules of roadbed settlement in construction and operation. The analog and actual results were in good consistence, the model is suitable for the roadbed deformation analysis of high-speed railway in seasonally frozen regions.

scholarly journals A Study on improving the durability of drone according to the area of impact applied with finite element analysis method

2018 ◽  
Vol 7 (2.12) ◽  
pp. 276
Author(s):  
Kye Kwang Choi ◽  
Jae Ung Cho
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fracture Stress ◽  
Equivalent Stress ◽  
Basic Data ◽  
Deformation Analysis ◽  
Analysis Method ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Rear Impact

The objective of this paper is to identify the dangers of damage on drones according to the area of impact and obtain the basic data for improving the durability. The durability by impact according to the weight and speed of the large-size drone is calculated and analyzed using a finite element analysis method with 3D model according to the area of impact. For the analytical results, the possibility of fracture is identified and weak areas are improved through the distribution of equivalent stress and deformation analysis using polyester resin, which is a material used for the drone. The equivalent stresses applied to drones in head-on impact and broadside impact were 296.22MPa and 349.36MPa respectively. The broadside impact producing the highest fracture stress of over 300MPa and the bottom part of the battery pack is limited to a fairly narrow area, so the improvements can be made by reinforcing this area. The great damage may occur from rear impact as the results show 828.28MPa, which is much higher than the fracture stress at rear impact to be the greatest drawback. Also for the deformation results, the values of head-on impact and broadside impact were in the safety range according to the elongation rate, while the drone greatly suffered from deformation and damage in rear impact. At the simulation analysis, the change of material must also be considered along with the change in design for rear collision. It is thought to obtain the basic data for future designing of large-sized drones by referring the results of this research, and it may contribute to the improvement of drone durability. By applying this study result to the drone, it is thought to contribute to the improvement on the durability of drone design due to the area of impact.  

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