检索结果-南通市图书馆

Establishment and Validation for the Theoretical Model of the Vehicle airbag

Chinese Journal of Mechanical Engineering 2015年第3期28卷 487-495页

作者： ZHANG Junyuan JIN Yang XIE Lizhe CHEN Chao State Key Laboratory of Automobile Simulation and Control Jilin University China Automotive Technology & Research Center

The current design and optimization of the occupant restraint system（ORS） are based on numerous actual tests and mathematic simulations. These two methods are overly time-consuming and complex for the concept design phase of the ORS, though they＇re quite effective and accurate. Therefore, a fast and directive method of the design and optimization is needed in the concept design phase of the ORS. Since the airbag system is a crucial part of the ORS, in this paper, a theoretical model for the vehicle airbag is established in order to clarify the interaction between occupants and airbags, and further a fast design and optimization method of airbags in the concept design phase is made based on the proposed theoretical model. First, the theoretical expression of the simplified mechanical relationship between the airbag＇s design parameters and the occupant response is developed based on classical mechanics, then the momentum theorem and the ideal gas state equation are adopted to illustrate the relationship between airbag＇s design parameters and occupant response. By using MATLAB software, the iterative algorithm method and discrete variables are applied to the solution of the proposed theoretical model with a random input in a certain scope. And validations by MADYMO software prove the validity and accuracy of this theoretical model in two principal design parameters, the inflated gas mass and vent diameter, within a regular range. This research contributes to a deeper comprehension of the relation between occupants and airbags, further a fast design and optimization method for airbags＇ principal parameters in the concept design phase, and provides the range of the airbag＇s initial design parameters for the subsequent CAE simulations and actual tests.

关键词： occupant restraint systems airbag theoretical model concept design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A hierarchical updating method for finite element model of airbag buffer system under landing impact

引用

Chinese Journal of Aeronautics 2015年第6期28卷 1629-1639页

作者： He Huan Chen Zhe He Cheng Ni Lei Chen Guoping State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Institute of Vibration Engineering Research Nanjing University of Aeronautics and Astronautics Research Institute of Pilotless Aircraft Nanjing University of Aeronautics and Astronautics China Aviation Industry General Aircraft Co.Ltd.

In this paper, we propose an impact finite element （FE） model for an airbag landing buf- fer system. First, an impact FE model has been formulated for a typical airbag landing buffer system. We use the independence of the structure FE model from the full impact FE model to develop a hierarchical updating scheme for the recovery module FE model and the airbag system FE model. Second, we define impact responses at key points to compare the computational and experimental results to resolve the inconsistency between the experimental data sampling frequency and experi- mental triggering. To determine the typical characteristics of the impact dynamics response of the airbag landing buffer system, we present the impact response confidence factors （IRCFs） to evalu- ate how consistent the computational and experiment results are. An error function is defined between the experimental and computational results at key points of the impact response （KPIR） to serve as a modified objective function. A radial basis function （RBF） is introduced to construct updating variables for a surrogate model for updating the objective function, thereby converting the FE model updating problem to a soluble optimization problem. Finally, the developed method has been validated using an experimental and computational study on the impact dynamics of a classic airbag landing buffer system.

关键词： airbag Hierarchical model Impact Model updating Radial basis function

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multi-objective Optimization Design of Vented Cylindrical airbag Cushioning System for Unmanned Aerial Vehicle

引用

Transactions of Nanjing University of Aeronautics and Astronautics 2016年第2期33卷 208-214页

作者： Shao Zhijian He Cheng Pei Jinhua Research Institute of Pilotless Aircraft Nanjing University of Aeronautics and Astronautics

Multi-objective optimization design of the gas-filled bag cushion landing system is ***,the landing process of airbag is decomposed into a adiabatic compression and a release of landing shock energy,and the differential equation of cylindrical gas-filled bag is presented from a theoretical perspective based on the ideal gas state equation and dynamic ***,the effects of exhaust areas and blasting pressure on buffer characteristics are studied,taking those parameters as design variable for the multiobjective optimization problem,and the solution can be determined by comparing Pareto set,which is gained by NSGA-Ⅱ.Finally,the feasibility of the design scheme is verified by experimental results of the ground test.

关键词： airbag vent orifice soft landing multi-objective optimization unmanned aerial vehicle (UAV)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

airbag Mapped Mesh Auto-Flattening Method

引用

Tsinghua Science and Technology 2005年第3期10卷 387-390页

作者：张金换马春生白远利黄世霖 State Key Laboratory of Automotive Safety and Energy Department of Automotive Engineering Tsinghua University Beijing 100084 China

Current software cannot easily model an airbag to be flattened without wrinkles. This paper im- proves the modeling efficiency using the initial metric method to design a mapped mesh auto-flattening algo- rithm. The element geometric transformation matrix was obtained using the theory of computer graphics. The algorithm proved to be practical for modeling a passenger-side airbag model. The efficiency and preci- sion of modeling airbags are greatly improved by this method.

关键词： airbag modeling initial metric method (IMM) auto-flattening

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental Research on Permeability of airbag Fabrics at High Pressure Differential

引用

Journal of Donghua University(English Edition) 2004年第5期21卷 43-45页

作者：王新厚 College of Textiles Donghua University Shanghai 200051

The air permeability of airbag fabrics was measured at high pressure differential up to 200 kPa. It was found that permeability varied with pressure differential nonlinearly. The relationship between air permeability and the pressure differential was fitted well with power law curve. The study revealed that the coefficient c and exponent b in the power law equation had a strong correlation with porosity, which was chosen to characterize the airbag fabrics.

关键词： airbag Fabric Permeability Porosity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

让airbag更安全

引用

汽车知识 2009年第8期 108-109页

作者：赵航建明

安全气囊这项装备在今天已经被广泛认同,人们在买车时提到安全性自然而然地会询问有多少个气囊,似乎气囊越多,车辆的安全系数越高。其实,安全气囊只是个辅助保护设备,并不是万能的保护伞,如果不注意使用方法和悉心维护,它也有可能成为... 详细信息

安全气囊这项装备在今天已经被广泛认同,人们在买车时提到安全性自然而然地会询问有多少个气囊,似乎气囊越多,车辆的安全系数越高。其实,安全气囊只是个辅助保护设备,并不是万能的保护伞,如果不注意使用方法和悉心维护,它也有可能成为定时炸弹。

关键词：安全气囊辅助保护 airbag 安全气囊系统

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Characteristic Verification and Parameter Optimization of airbags Cushion System for Airborne Vehicle

引用

Chinese Journal of Mechanical Engineering 2014年第1期27卷 50-57页

作者： WANG Hongyan HONG Huangjie HAO Guixiang DENG Huaxia RUI Qiang LI Jianyang Department of Mechanical Engineering Academy of Armored Force Engineering School of Instrument Science and Opto-electronics Engineering Hefei University of Technology

Abstract： The major methods to investigate the airbags cushion system are experimental method, thermodynamic method and finite element method （FEM）. airbags cushion systems are very complicated and very difficult to be investigated thoroughly by such methods For experimental method, it is nearly impossible to completely analyze and optimize the cushion characteristics of airbags of airborne vehicle because of charge issue, safety concern and time constraint. Thermodynamic method fails to take the non-linear effects of large airbag deformation and varied contact conditions into consideration. For finite element method, the FE model is usually complicated and the calculation takes tens of hours of CPU time. As a result, the optimization of the design based on a nonlinear model is very difficult by traditional iterative approach method. In this paper, a model based on FEM and control volume method is proposed to simulate landing cushion process of airborne vehicle with airbags cushion system in order to analyze and optimize the parameters in airbags cushion system. At first, the performance of airbags cushion system model is verified experimentally. In airdrop test, accelerometers are fixed in 4 test points distributed over engine mount, top, bottom and side armor plate of hull to obtain acceleration curves with time. The simulation results are obtained under the same conditions of the airdrop test and the simulation results agree very well with the experimental results, which indicate the established model is valid for further optimization. To optimize the parameters of airbags, equivalent response model based on Latin Hypercube DOE and radial basis function is employed instead of the complex finite element model. Then the optimal results based on equivalent response model are obtained using simulated annealing algorithm. After optimization, the maximal acceleration of airborne vehicle landing reduces 19.83%, while the energy absorption by airbags increases 7.85%. The

关键词： airborne vehicle airbag nonlinear finite element method verification equivalent response model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Data Mining Based Research of Development Direction of Waist Protection Equipment

引用

Medicinal Plant 2024年第2期15卷 84-90页

作者： Lingfeng ZHU Zhizhen LU Haijie YU Haifen YING Zheming LI Huashan FAN Zhoushan Hospital of TCM Zhoushan 316000China The Third Clinical School of Zhejiang Chinese Medical University Hangzhou 310053China Shengsi Hospital of TCM Zhoushan 2024502China

[Objectives]To explore the trend of brands towards the design of waist protection products through data mining,and to provide reference for the design concept of the contour of waist protection pillow.[Methods]The structural design information of all waist protection equipment was collected from the national Internet platform,and the data were classified and a database was *** SPSS 26.0 and MATLAB 2018a were used to analyze the data and tabulate them in Tableau *** the association rules were clarified,the data were imported into Cinema 4D R21 to create the concept contour of waist protection pillow.[Results]The average and standard deviation of the single airbag design were the highest in all groups,with an average of 0.511 and a standard deviation of *** average and standard deviation of the upper and lower dual airbags were the lowest in all groups,with an average of 0.015 and a standard deviation of 0.120;the correlation coefficient between single airbag and 120°arc stretching was 0.325,which was positively correlated with each other(Pairbags and 360°encircling fitting was 0.501,which was positively correlated with each other and had the highest correlation degree(Pairbag design is well recognized by companies,and has received the highest attention among all brand *** focusing on single airbag design,most brands will consider the need to add 120°arc stretching elements in product *** the time of focusing on multiple airbag design,some brands believe that 360°encircling fitting elements need to be added to the product,and the correlation between the two is the highest among all groups.

关键词： Spine Low back pain Data mining airbag Stretching Fitting Steel plate support Bidirectional compression Conceptual contour Design

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Simulation and optimization for airdrop adaptability of overweight equipment

引用

Journal of Measurement Science and Instrumentation 2015年第3期6卷 247-252页

作者：徐健李强杨臻中北大学机电工程学院山西太原030051

airbag buffer process was analyzed with the aid of aerodynamic and thermodynamic *** on the current structure of the airbag,the terminal velocity was too ***,the research on the diameter and height of the airbag was done and the feasible design area was *** the optimized structure parameters,the airbag buffer experiment under normal conditions was ***,the residual height and internal pressure of the airbag as well as the terminal velocity and acceleration of the airdrop were *** experiment results show that the optimized airbag is feasible for 20 t cargo airdrop.

关键词： airdrop adaptability airbag terminal velocity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：