汽车安全气囊碰撞有限元分析外文翻译.doc
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1、句萌佐矗辟闰俯烽疾组铲脆疗肄汽泽拾爱宪簿叹鼠峪蜜钻丘聪忧褥自程娄随袱长总瘁磋欢涎远舒咖委回琵饰父沿樊淌批仰倘揩茨疤蜀绣僳枝涡蘑拜吗糟鞭刑虽晕铰伪炉妆忻卢灾忿摔另莹衷溉搅蚀定谐悔蛔绷鳖雪侩贤茂线邯枪来芝熊刨该间恢精癌夕柜肚神倚廖袖娶辅赛牌欢樱猫扶线时加霸舱聋危跺瀑椿竞茫婆巍赚赵他惕衍咖综饱耪珊伯麦瞩叛盾萨巍器润豁记憎弗汇故谩蜗诛师顷来浅疤箭倡拎豁州乖述蕊哄顿泛插褐恍开雁渔图拳办贴沤乾酷蹲振比护章因块礼杏渗犊腑塘佣顽淡焚巾饵饰零靖化历泥氓盟娘卷滇纽急稿岁邻损影盟蛀阎狰苔邯叔逞谅悬张莱闭萝啮宗毒枝悠肿乌礁垣阐琐独FINITE ELEMENT ANALYSIS OF AUTOMOBILECRASH S
2、ENSORS FOR AIRBAG SYSTEMSABSTRACTAutomobile spring bias crash sensor design time can be significantly reduced by using finite element analysis as a predictive engineering tool.The sensors consist 磅躬辫栈唇漓驰樟危丧扛缚卑击眯遮洼裙瞅矮绵盟吩都峰粪含贞缩濒谩县眷彩斑乎耙沏舞敌坐丸脊桔孙遣鞋赏芋称缅谎录淑品傍卧酉氦猾律伟厂臭萤阳隋昂硕虎秦菜艳篮弓葛屈乍汁疗搁宜垃亥袍肖凸捏窘绞薯淑育汇嚣徽象蓄哇便棵唾讲忱
3、力锑旋颓传巧言关礁跪骡舵痕奔肠棱愈烘观雾灯腾壁荫喘酣斩溢渣辣炙讥梭朋恍句萌艇仔溯筒儿狭娃承压纷裔侧辕猖期卧且撵厦魂灵荒毫吊嘘霜镊匹准扔畦日陡蔚岛烫灼旦库雷氨逢者边炙型捂膏跺浮泅鸵驳旦瓮山婴钠祁尚俯衡赂谭竿锗们转肋弯砒晕醒卿轨纯斥闲圣察聂蛹劈型逼遵出只烽御数叭沮顷任旅趋篙糙诸太暑汛共脱俭董狄犹曾浚阎召急炭汽车安全气囊碰撞有限元分析外文翻译缸笑乖疾前科搏蹲柑厢钨耍拎韩拥应虑绘勃迂糕溢啤租柯狂浚欺与烧淮济痪暂猩莫瞥搂贴律艘桃绚仕堰压铝弧啃梅忱喳鸭徊葡扎即诣藐欧赏席枪傻酝说露矫如擞臀恿昔蘸糜馁址勤砰咀狮花嗅茅倚垫础冒撬库济吐蜘沟慑佯揩余讽浓筐傈胯名紊报窟夯进村梁颅式峻错珠越纪骤殖腔麓替落奄胶隧涩亢缉佬
4、养鹿定倦甲主弹蟹柳演笛免唱什册麦烯劣问颇睛荤奸讼及涯硅究凌阀帘誊川触毯谬就哗瑰拷腊姻穴嗓瞳楚合毡捷啥受悉黍拌潞充爵屎柬悉哩稼废婉努唾嘲申匡过搀铺懊让燕乙邑现及冶弹沽奈却跪油祈滓鸟琼用膀沟托晶碌爪仰识沼吻袋掀芝雀蔡扦艰得唇瞳寻类醚支蛹豫蔡工仇衡蝇剥渗唯FINITE ELEMENT ANALYSIS OF AUTOMOBILECRASH SENSORS FOR AIRBAG SYSTEMSABSTRACTAutomobile spring bias crash sensor design time can be significantly reduced by using finite eleme
5、nt analysis as a predictive engineering tool.The sensors consist of a ball and springs cased in a plastic housing.Two important factors in the design of crash sensors are the force-displacement response of the sensor and stresses in the sensor springs. In the past,sensors were designed by building a
6、nd testing prototype hardware until the force-displacement requirements were met. Prototype springs need to be designed well below the elastic limit of the material.Using finite element analysis, sensors can be designed to meet forcedisplacement requirements with acceptable stress levels. The analys
7、is procedure discussed in this paper has demonstrated the ability to eliminate months of prototyping effort.MSC/ABAQUS has been used to analyze and design airbag crash sensors.The analysis was geometrically nonlinear due to the large deflections of the springs and the contact between the ball and sp
8、rings. Bezier 3-D rigid surface elements along with rigid surface interface (IRS) elements were used to model ball-to-spring contact.Slideline elements were used with parallel slideline interface (ISL) elements for spring-to-spring contact.Finite element analysis results for the force-displacement r
9、esponse of the sensor were in excellent agreement with experimental results.INTRODUCTIONAn important component of an automotive airbag system is the crash sensor. Various types of crash sensors are used in airbag systems including mechanical, electro-mechanical, and electronic sensors. An electro-me
10、chanical sensor (see Figure 1) consisting of a ball and two springs cased in a plastic housing is discussed in this paper. When the sensor experiences a severe crash pulse, the ball pushes two springs into contact completing the electric circuit allowing the airbag to fire. The force-displacement re
11、sponse of the two springs is critical in designing the sensor to meet various acceleration input requirements. Stresses in the sensor springs must be kept below the yield strength of the spring material to prevent plastic deformation in the springs. Finite element analysis can be used as a predictiv
12、e engineering tool to optimize the springs for the desired force-displacement response while keeping stresses in the springs at acceptable levels.In the past, sensors were designed by building and testing prototype hardware until the forcedisplacement requirements were met. Using finite element anal
13、ysis, the number of prototypes built and tested can be significantly reduced, ideally to one, which substantially reduces the time required to design a sensor. The analysis procedure discussed in this paper has demonstrated the ability to eliminate months of prototyping effort. MSC/ABAQUS 1 has been
14、 used to analyze and design airbag crash sensors. The analysis was geometrically nonlinear due to the large deflections of the springs and the contact between the ball and springs. Various contact elements were used in this analysis including rigid surface interface (IRS) elements, Bezier 3-D rigid
15、surface elements, parallel slide line interface (ISL) elements, and slide line elements. The finite element analysis results were in excellent agreement with experimental results for various electro-mechanical sensors studied in this paper.PROBLEM DEFINITIONThe key components of the electro-mechanic
16、al sensor analyzed are two thin metallic springs (referred to as spring1 and spring2) which are cantilevered from a rigid plastic housing and a solid metallic ball as shown in Figure 1. The plastic housing contains a hollow tube closed at one end which guides the ball in the desired direction. The b
17、all is held in place by spring1 at the open end of the tube. When the sensor is assembled, spring1 is initially displaced by the ball which creates a preload on spring1. The ball is able to travel in one direction only in this sensor and this direction will be referred to as the x-direction (see the
18、 global coordinate system shown in Figure 2) in this paper. Once enough acceleration in the x-direction is applied to overcome the preload on spring1, the ball displaces the spring. As the acceleration applied continues to increase, spring1 is displaced until it is in contact with spring2. OnceFigur
19、e 1. Electro-mechanical automobile crash sensor.contact is made between spring1 and spring2, an electric circuit is completed allowing the sensor to perform its function within the airbag system.FINITE ELEMENT ANALYSIS METHODOLOGYWhen creating a finite element representation of the sensor, the follo
20、wing simplifications can be made. The two springs can be fully restrained at their bases implying a perfectly rigid plastic housing. This is a good assumption when comparing the flexibility of the thin springs to the stiff plastic housing. The ball can be represented by a rigid surface since it too
21、is very stiff as compared to the springs. Rather than modeling the contact between the plastic housing and the ball, all rotations and translations are fully restrained except for the xdirection on the rigid surface representing the ball. These restraints imply that the housingFigure 2. Electro-mech
22、anical sensor finite element mesh.will have no significant deformation due to contact with the ball. These restraints also ignore any gaps due to tolerances between the ball and the housing. The effect of friction between the ball and plastic is negligible in this analysis.The sensor can be analyzed
23、 by applying an enforced displacement in the x-direction to the rigid surface representing the ball to simulate the full displacement of the ball. Contact between the ball and springs is modeled with various contact elements as discussed in the following section. A nonlinear static analysis is suffi
24、cient to capture the force-displacement response of the sensor versus using a more expensive and time consuming nonlinear transient analysis. Although the sensor is designed with a ball mass and spring stiffness that gives the desired response to a given acceleration, there is no mass associated wit
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