Optimization of the Frontal Rail Based on Composite Material

2012 ◽  
Vol 229-231 ◽  
pp. 321-324
Author(s):  
Hong Tao Yu ◽  
Lei Liu ◽  
Gui Fan Zhao ◽  
Zi Peng Zhang
Keyword(s):  
Composite Material ◽  
Head Injury ◽  
Element Model ◽  
Test Method ◽  
Vehicle Safety ◽  
Frontal Crash ◽  
Sled Test ◽  
Full Vehicle ◽  
Orthogonal Test Method ◽  
The Finite Element Model

Frontal rail constructed of composite material was researched, in order to improving vehicle safety performance in frontal crash as well as lightweight of vehicle. Compliance to FMVSS 208, the vehicle frontal crash was simulated using the finite element model of the full vehicle. The occupant head injury was analyzed by sled test using crash pulse. Then, the composite material parameters which have the best function of reducing the occupant head injury value were studied by using orthogonal test method. Using this kind of composite materials, the occupant safety protection was effectively improved and the weight of the frontal rail was greatly reduced.

Development and Validation of Offset Deformable Barrier Model with Beam Element

2011 ◽  
Vol 128-129 ◽  
pp. 1139-1142
Author(s):  
Li Bo Cao ◽  
Wen Tao Cheng ◽  
Xiang Nan Shi ◽  
Jie Chen ◽  
Li Quan
Keyword(s):  
Element Model ◽  
Local Deformation ◽  
Deformation Characteristics ◽  
Static Compression ◽  
Shell Elements ◽  
Sled Test ◽  
Beam Elements ◽  
Development And Validation ◽  
The Finite Element Model ◽  
Quasi Static Compression

According to GB/T 20913-2007 regulation, the finite element model of the offset deformable barrier (ODB) was built with beam and shell elements, and validated in the simulation of quasi-static compression test. In order to analyze the local deformation characteristics of the ODB model, a sled test was designed. A cylinder impactor of 110 mm in diameter was welded in front of the sled. It was used to impact the fixed ODB. The simulation model of this test was also built. The acceleration of the sled and the deformation of the ODB were measured in the test and compared with the simulation data. The results show that the ODB model with beam elements not only satisfies the demands of the regulations, but also has good local deformation characteristics. The efficiency of computing can be improved obviously with beam elements.

scholarly journals Optimal Design for the Structure Parameters of Long Raster Engraving Air-floating Platform

Mechanika ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 55-63
Author(s):  
Deyun Mo
Keyword(s):  
Film Thickness ◽  
Element Model ◽  
Structure Design ◽  
Test Method ◽  
Loading Capacity ◽  
Three Dimension ◽  
Floating Platform ◽  
Range Analysis ◽  
Orthogonal Test Method ◽  
Air Film

Air-floating platform is the core component of long raster engraving system. In order to design an air-floating platform to greatly meet the demands of long raster engraving, this paper, based on the validation of simulation model accuracy by test platform, proposes a three-dimension finite element model about gas film, and investigates the influence of the gas film thickness, air pressure and width of bottom guideway on the loaded capacity and air consumption by orthogonal test method. Then the best design plan of air-floating platform structure was determined by range analysis method. The results showed that air film thickness H=0.02 mm, gas supply pressure Ps=0.15 MPa, width of bottom guideway Bx=140 mm, the loading capacity of single-sided guideway is about 3177 N, its air consumption is 191487 mm3/s. Hence, this plan can not only meet the requirements of the loading capacity but also reduce air consumption of air-floating platform so as to provide a basis for optimum structure design about air-floating platform.

Strength Testing of Fabric Composite Material and Impact Simulation for Airbag Landing System

2015 ◽  
Vol 1095 ◽  
pp. 463-467
Author(s):  
Jian Zheng Wei ◽  
Hui Feng Tan ◽  
Bo Song ◽  
Zhi Min Wan
Keyword(s):  
Composite Material ◽  
Element Model ◽  
Strength Testing ◽  
Soft Landing ◽  
Material Parameters ◽  
Impact Simulation ◽  
Inner Pressure ◽  
Silicone Coating ◽  
Fabric Composite ◽  
The Finite Element Model

The “Orion crew exploration vehicle” of NASA takes airbag as one way of landing system, which can reduce the landing weight, maintain the reposefully landing of the vehicle, protect the detector during recycling. In this paper, taking into account the material quality and the change during soft-landing of the airbag, the tensile mechanical properties tests of plain weave composite material airbag have been conducted at different temperature and different silicone coating thickness. Based on the material parameters of the test, the finite element model has been created to obtain the inner pressure and the overload curve of the airbag which has a certain angle with the ground. The result shows that the airbag made of fabric composite material can realize the landing and recycling of the vehicle.

Study on one Kind of Test Method of Simplified Side Impact Using Sled Test

2011 ◽  
Vol 301-303 ◽  
pp. 1249-1253
Author(s):  
Zhi Xin Liu ◽  
Lei Lou ◽  
Yun Sheng Yang
Keyword(s):  
Safety Performance ◽  
Test Method ◽  
Side Impact ◽  
Velocity Pulse ◽  
Sled Test ◽  
Full Vehicle ◽  
Vehicle Test

Frontal sled test is an important platform that widely employed to predict and assess changes in overall safety performance as vehicle structural and occupant restraint parameters are varied. In this paper, a characteristic door intrusion velocity pulse in side impact was analyzed and a set of side test jig was designed, which realized one kind of simplified side impact sled test method. Then we compared the injury values of the side impact dummy, the result showed that there existed good correlation between sled test and full-vehicle test.

scholarly journals Establishment and experimental verification of the hoop tension mechanical model of aluminum alloy tube

2020 ◽  
Vol 24 (3 Part A) ◽  
pp. 1811-1818
Author(s):  
Xiaohua Chen ◽  
Zhanshan Wang ◽  
Yan Yang ◽  
Guangcai Zhang
Keyword(s):  
Mechanical Model ◽  
Model Simulation ◽  
Element Model ◽  
Tension Test ◽  
Test Method ◽  
Variation Characteristics ◽  
Bulging Test ◽  
Aluminum Alloy Tube ◽  
The Finite Element Model ◽  
Important Test

The ring hoop tension test is an important test method for evaluating the deformation performance of tube. The mechanical model of the hoop tension test is established under the condition that deformation caused by the friction of the die is unequal. The mechanical model is input into the finite element model and compared with the tube uniaxial hoop tensile test. The mechanical model simulation obtained by this method has a better coincidence with the experimental data. Through further analysis of the bulging test of the process, it is proved that the established hoop mechanical model can accurately reflect the plasticity variation characteristics of the tube deformation.

A Design Approach of a Fuselage Barrel in Grid Structure

2005 ◽  
Author(s):  
Giuseppe Gatta ◽  
Fulvio Romano
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Finite Element Model ◽  
Lattice Structure ◽  
Element Model ◽  
Geometric Constraints ◽  
Central Research ◽  
Grid Structure ◽  
Global Buckling ◽  
The Finite Element Model

In this paper a design method of a cylindrical fuselage barrel in grid structure to fabricate in composite material is illustrated. The approach can be divided in two phases. In the first step, a lattice structure, that is a grid structure with ribs only and without a skin, is sized thanks to an analytical approach. The independent variables to optimize are five: number of helical ribs, number of circumferential ribs, rib height, circumferential rib thickness, helical rib thickness. Some geometric constraints on the dimensions of the ribs are introduced. The best lattice structure is individuated by an analytical theory due to professor Vasiliev of the Central Research Institute of Special Machine Building (CRISM), the leading Russian Composite Center. The theory is based on the calculation of four safety factors for the helical rib strength, axisymmetric global buckling, non axisymmetric global buckling and the helical rib local buckling. Successively, a finite element analysis is performed in order to verify the analytical results. A software tool developed in Matlab environment prepares the finite element model, runs the finite element solver (MSC/Nastran) and reads the results. In the second step, an outer skin is added and the best lay-up for it is chosen; the maximum failure index for the skin laminate is calculated too. At the end the structure with the minimum weight and all margins of safety positive is individuated. The skin is extremely light so as to minimize overall weight. In the finite element model ribs and skin are simulated with beam and shell elements respectively; for the skin a common high-strength graphite/epoxy composite material is used, for the ribs an isotropic material with properties derived from experimental data. A grid-stiffened structure allows to reduce the structural mass of about 20% respect to a metallic reference baseline. Moreover, it can be quickly constructed by using filament winding technology; the process can be highly automated and the manufacturing costs can be reduced of the 30%.

Occupant Dynamic Responses for Evaluation of Compliance Characteristics of Aircraft Bulkheads

1992 ◽  
Author(s):  
Hamid M. Lankarani ◽  
Deren Ma ◽  
Rajiv Menon
Keyword(s):  
Head Injury ◽  
Contact Force ◽  
Head Injuries ◽  
Element Model ◽  
Dynamic Responses ◽  
Instrument Panel ◽  
Force Model ◽  
Sled Test ◽  
Contact Force Model ◽  
Head Injury Criteria

Abstract One important aspect of aircraft crashworthiness studies is to reduce head injuries to an aircraft occupant in case of a head contact with its surroundings. In view of the significance of this problem, studies of post-crash dynamic behavior of victims and the compliance characteristics of the aircraft bulkhead are necessary in order to reduce severe head injuries. Crash dynamics program SOM-LA/TA, incorporating a dynamic model of the human body with a finite element model of the seat structure was used. Modifications including development of more accurate contact force models and an occupant/seat envelope were performed in SOM-LA/TA. It was then used as an analytical tool for determination of the occupant response and the compliance characteristics of the bulkhead in various crash environments. Correlated studies of analytical simulations with impact sled test results were accomplished. It was observed that the code reasonably predicted the Head-Injury-Criteria (HIC) for the triangular-shaped pulses. A parametric study of the coefficients in the contact force model was then performed in order to obtain a correlation between the HIC and the coefficients in the contact force model. A measure of optimal values for the bulkhead compliances and displacement requirements was thus achieved in order to keep the possibility of head injury as little as possible. This information could in turn be used in the selection of suitable materials for the bulkhead, instrument panel, or interior walls of an aircraft.

Transient response analysis of the variable frequency cropping system

2007 ◽  
Vol 221 (7) ◽  
pp. 769-778
Author(s):  
Z W Wang ◽  
S D Zhao ◽  
Y T Yu ◽  
L J Zhang
Keyword(s):  
Dynamic Analysis ◽  
Cropping System ◽  
Green Manufacturing ◽  
Element Model ◽  
Vibration Characteristics ◽  
Test Method ◽  
Response Analysis ◽  
Variable Frequency ◽  
Lumped Mass ◽  
Orthogonal Test Method

Variable frequency cropping is a new type of green manufacturing technology that utilizes the forced vibration of a cropping machine and the stress concentration effect of a V-shaped notch to produce crack initiation and propagation. In this paper, dynamic analysis of a variable frequency vibration cropping system is performed. First, the working principle and components of a variable frequency cropping system are explained. Further analysis shows that vibration characteristics are the main subject of variable frequency cropping. Second, the orthogonal test method is adopted to assess the influence of geometric parameters of the V-shaped notch on the vibration characteristics of metal bars. The results indicate that a V-shaped notch has little effect on the vibration mode frequency. Third, a finite-element model of the cropping system is constructed, which is composed of rigid bar elements, a beam element, a lumped mass element, and spring elements. Then the modal and dynamic analyses are conducted. The vibration characteristics and the ideal cropping frequency range are obtained on the basis of the results of the dynamic analysis. Finally, cropping experiments on bars made of Al-Cu4MgSi, C45e, C20e, and TC80 are carried out under conditions of three variable frequency curves.

Analysis of Structure Dynamic Characteristics of ATV Frame with Engine

2014 ◽  
Vol 722 ◽  
pp. 89-92
Author(s):  
Fang Ye ◽  
Zhong Ming Xu ◽  
Xi Cheng Zhai
Keyword(s):  
Computer Simulation ◽  
Ride Comfort ◽  
Element Model ◽  
Simulation Method ◽  
Service Performance ◽  
Vehicle Safety ◽  
Frequency Synchronization ◽  
Vibration Characteristic ◽  
Characteristic Analysis ◽  
The Finite Element Model

ATV, also known as the all terrain vehicle, and its vibration comfort has become one of the most important service performance. The frame is the skeleton of ATV, the vibration characteristic analysis of the frame elastic hanging engine, has great effect on vehicle safety and vibration comfort. It is using the computer simulation method for dynamic characteristic research of ATV frame with engine, and the experimental modal analysis is competed in this paper. By comparison to the computational modal and experimental modal results of ATV body, it is found the error within 10%, so the finite element model of car body is effective. Then, it’s found that the ATV body’s resonance is caused by vibration frequency synchronization of the excitation of the engine and ATV body, it provides a direction and method for the improvement of the ATV’s whole ride comfort.

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