汽車車架結(jié)構(gòu)設(shè)計（含CAD圖紙和說明書）
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譯文題目： 基于ANSYS的汽車車架結(jié)構(gòu)有限元分析
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20xx年 2月 27日
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Automotive safety systems and technology
research and analysis
Auto parts of good and bad will directly affect the safety of the car, are directly related to the people's life safety and security in wealth. This article mainly from the car's active safety technology and passive safety technology two aspects elaborated the importance of car parts, and how to improve the safety of the car.
One．Automobile active security technology
1. ABS braking system
Anti-lock Braking System (Anti-lock Braking System, referred to as ABS) consists of ABS computers, hydraulic device, the wheel speed sensors, brake hydraulic pipeline and electrical wiring etc. Their structures are shown below.
ABS tasseled for the car in various driving conditions braking performance and brake safety particularly important, especially is emergency braking, can make full use of the peak between tire and road surface adhesion properties, improve performance and reduce automobile fight side slip braking distance, give full play to the braking performance, but also increase the automobile braking process control. So as to reduce the possibility of car accidents.
2．the ASR drive torque control system
ABS are used to prevent car braking process wheel lock, will wheel sliding rate control in ideal range, so as to shorten the braking distance, improve automobile braking direction stability and steering control, so as to improve the safety of the car. Along with the increase of vehicle performance requirements, not only in braking process required to prevent wheel lock, and asked the driver to prevent drive roller skating turn in the process, making cars in the direction stability, driving process steering control ability and acceleration performance, so are improved by the car drive torque steering system ASR (Accelerations Slip Regulation) . ASR is the perfect complement and ABS ASR, but most alone is set with ABS combined together, commonly used ABS/ASR says, called anti-skid control system.
ASR is mainly used to prevent car in the beginning, accelerate the wheels, guarantee slip in the car accelerated rate and improve the stability in bad pavement drive attached conditions. It makes no difference speed in the car lock ice roads and muddy road started and to improve its capacity, also can prevent high in speed by turning cars gliding pavement and rear lateral spreads phenomenon.
Anyhow, prevent the wheel because ASR slip, can maximize the engine driving moment of cars ，had enough ensured the longitudinal force, lateral force and manipulation of power, make cars in starting, steering and accelerate the process, in gliding and muddy road, in a mountain area downhill process can steadily driving, guarantees the safety, reducing tire wear and fuel consumption, and improves the car driving capability.
3．VDC system
VDC of steering control system is mainly by driving for each wheel brake control and engine power output control to realize. For example, if the car turn left front wheel for steering the inadequate capacity tend to slip out of the corner, VDC system can measure imminent, just know lateral spreads left rear brake adopt appropriate measures. If at the same corner, because rear wheel tend to slip out of favor of lateral overmuch, VDC system is proper braking to front-right wheel failure, maintain the stability of the vehicle driving. In extreme cases, VDC system can also take reduce engine to reduce the power output, and to reduce the speed of the demand side adhesion ability to maintain the stability of the vehicle driving. Adopt VDC system, automobile in folio pavement or corner of pavement braking distance still can further reduce.
4． CCS cars cruise control system
Auto cruise Control System (Cruiser Control System, abbreviation for CCS) is can make automobile work in engine favorable speed range, reduce driver's driving manipulate labor intensity, improve the driving comfort the automatic driving device.
Car cruising system (CCS) role is required by the driver: after a normally-closed switch, no speed on the accelerator pedal can automatically keep the speed, make the vehicle with the fixed speed. Using this device, when on the highway after a long time, the driver driving not have to control the accelerator pedal, reduce fatigue, while reducing unnecessary speed change, can reduce save fuel.
Two. Automobile passive safety technology
1. Seat belt
Car seat belt is a safety device, it can in car collision or sharp turn, make crew to keep its original position as possible without mobile and rotation, avoid collision with in-car hard parts caused damage. Seat belts and airbags, as modern cars are safety devices, but the long history of the former, popularize the scope.
The seemingly simple seat belt actually not "simple". Attention has been at the forefront of traffic safety, through the analysis of general motors after a car accident found: seat belt not only makes people protect the lives, can be in more than half of the accident to reduce or even eliminate drivers, motorists are the chance of injury. Car collision or unexpected emergency braking force generated great inertia, will allow the driver and passenger and car windscreen, steering wheel, seat, collision happened objects such as secondary to drive is caused extremely easily crew serious damage, even drive occupant seats or threw the apex, seat belts can will ride in the seat. Bondage personnel When has the accident, which can effectively prevent the collision, and its buffer role can absorbs a great deal of kinetic energy, reduce rides personnel extent of the injuries.
2. The airbag
Under the condition of seat belt used in the crew, airbag helps reduce chest, head and facial injuries in the seriousness of the collision. When car collision happened before, the first is the car to stop motion, car under the action of inertial force crews to go forward with the original speed still sport. Not wearing a seat belt crews will and steering dish, front windscreen together, so it can be severely hurt; Wearing a seat belt as car stop the crew can stop moving forward movement and gradually. If collision violent, crew forward movement of the seat belts, even faster in the complete stop before motion, still collide with in-car things together. If this fashion in steering the disk or within the pop up balloon inflated dash, it can protect the occupant reduce the possibility of car together with things, more uniform dispersion head, chest, absorb the impact energy of movement, thus crew has added effect of seat belts.
Three. Automobile active safety new technology
1. Eye Car skills
Eye Car technology can make each driver eyes in the same relative height, guarantee of pavement and the surrounding a six-lane unimpeded sight and best visibility. This technology can also offer a specific driving environment.
2. Cam Car technology
Cam Car technology aims to help improve the driver of perception.
Four. Automobile passive safety new technology
1. Future airbags
(1) It cans inflatable screen system. This is a new safety design; its basic principle is to protect in-car occupant's head, when that happens it will carry on the air, air after the tent shape is swelling.
(2) Tubular inflatable structure head air sac. This system for supplement current side protection system, still stopover in protecting the chest ,and abdomen, arm, to head protection were insufficient. It with rigid body structure, the door body protective just beams, side air sac, can form a complete side safe defend net, this will be the future security protection trend.
(3) Head support system. Head support system generally called the headrest, vehicles which the headrest, with seats, not just for comfortable fact is more important to safety. Vehicle if in an emergency brake, the body will have strong to and fro, because the principle of inertia occupant body swinging, especially neck must follow. If no head support buffer headrest, neck injury caused by damage is very surprising.
(4) The external airbags.
2. Adaptive constraint technology system (ARTS)
New adaptive constraint technology system (ARTS) use a series of sensors to monitor the driver seat, seat belt use, in front of the occupant take quality and location and intensity of the collision of the collisions and collision force direction, then according to the specific information such as the collision of each front airbag characteristics of the crew on regulated. The system can further reduce due to improper airbag for crew on the damage, especially for smaller front row figure crew.
3. Automobile energy-absorbing direction column
Automobile energy-absorbing direction column through collisions of redistribution to steering wheel wallop, would wallop path to deliver shunt quickly, making the minimum of load on the steering wheel. The steering column by hollow tubes and steering bearings form. Traditional hollow tubes and the steering column steering bearings is integral, steering shaft top and steering connections, the connecting with direction below. And suck can direction string of characteristic is will the steering column in two, divided into unblock steering column and the steering column under two parts; Inside of the steering shaft also divided into two sections, with outgoing quarter agencies between them connected. Once a collision make direction, outgoing quarter mechanism has displacement bottom tailor-made steering shaft will fold, under the steering column move on the steering column, to achieve "indented within" and thus expand space reduce damage.
Five. The tire pressure monitoring system
How to prevent a blowout has become an important task of safe driving. According to the national quality supervise center of rubber tires in the expert analysis, maintain the standard tire pressure driving and the timely discovery tire is the key to prevent puncture. Tire Pressure and Monitoring System (TPMS) - car Tire Pressure Monitoring System will no doubt is the ideal tool. The system is mainly used in automobile driving to tire pressure real-time automatic monitoring; to a flat tire and depression are the police, in order to ensure safety.
Drivers from the monitors can know each tire pressure value, when tire pressure below the club set pressure limit, monitor will automatically alarm.
Anyhow, car active safety technology and passive safety technology for the safety of automobile driving is very important, and besides, such as environmental factor, artificial factor of the vehicle safety is also very important. Therefore, we must be prepared to all aspects of requirements and technology, to ensure the safety of vehicle driving.
汽車安全系統(tǒng)技術(shù)研究與分析
汽車零部件的好壞將直接影響到汽車的安全，直接關(guān)系到人民群眾的生命安全和財產(chǎn)安全。本文主要從汽車的主動安全技術(shù)和被動安全技術(shù)兩個方面闡述了汽車零部件的重要性，以及如何提高汽車的安全性。
一、汽車主動安全技術(shù)
1．ABS防抱死制動系統(tǒng)
防抱死制動系統(tǒng)(防抱死制動系統(tǒng),簡稱ABS)由制動系統(tǒng)、液壓裝置、車輪速度傳感器、制動液壓管路及電氣接線等組成。其結(jié)構(gòu)如下。
ABS系統(tǒng)的汽車在各種行駛條件下的制動性能和制動安全尤為重要，特別是緊急制動，能充分利用輪胎表面和道路之間的峰值粘附性能，提高汽車抗側(cè)滑性能并縮短制動距離，充分發(fā)揮制動性能，同時也增加了汽車制動過程的控制。從而減少汽車事故的可能性。
2. ASR驅(qū)動扭矩控制系統(tǒng)
汽車制動系統(tǒng)是防止汽車制動過程車輪鎖死，將車輪的滑動速度控制在理想的范圍內(nèi)，從而縮短制動距離，提高汽車制動方向穩(wěn)定性和轉(zhuǎn)向操縱性，從而提高汽車的安全性。隨著對汽車性能要求的提高，不僅要求在制動過程中防止車輪鎖死，并且要求司機在駕駛過程中防止驅(qū)動輪滑轉(zhuǎn)，使汽車在驅(qū)動過程中的方向穩(wěn)定性、轉(zhuǎn)向控制能力和加速性能都得到提高，所以都是通過汽車驅(qū)動扭矩轉(zhuǎn)向系統(tǒng)ASR（加速度滑差調(diào)節(jié)）改進的。ASR是ABS的完善和補充，但大多數(shù)單獨設(shè)置的ASR與ABS結(jié)合在一起，常用ABS/ASR表示，稱為防滑控制系統(tǒng)。
ASR主要用來防止汽車在起步、加速時的車輪滑轉(zhuǎn)，保證汽車在滑加速率的穩(wěn)定性并改善在不良路面附著條件驅(qū)動。它能使得汽車在冰雪道路和泥濘道路上以無差異速度開始并且提高其承載能力，也能防止高速行駛的車輛通過滑動路面時時汽車后部的側(cè)滑現(xiàn)象。
總之，由于ASR防止了車輪的滑轉(zhuǎn)，可以最大限度地提高汽車的發(fā)動機驅(qū)動力矩，充分保證了汽車的縱向力、側(cè)向力和操縱力，使汽車在起動、轉(zhuǎn)向和加速過程中，在滑動和泥濘的道路，在山區(qū)下坡過程中都能穩(wěn)定地行駛，保證安全，減少輪胎磨損和燃料消耗，提高汽車駕駛能力。
3． VDC系統(tǒng)
VDC轉(zhuǎn)向控制系統(tǒng)主要是通過驅(qū)動每個車輪的制動控制和發(fā)動機輸出功率控制來實現(xiàn)的。例如，如果汽車轉(zhuǎn)動左前輪由于轉(zhuǎn)向能力不足而容易滑出彎道，VDC系統(tǒng)便可測出側(cè)滑即將發(fā)生，可以僅僅憑借知道側(cè)滑左后制動就采取適當(dāng)措施。如果在同一個彎道，因為后輪趨于側(cè)向滑出過多，VDC系統(tǒng)就會采取適當(dāng)?shù)闹苿佑仪拜喌霓k法，維持穩(wěn)定的車輛駕駛。在極端的情況下，VDC系統(tǒng)還可采取降低發(fā)動機的輸出功率來降低行駛車速，并降低速度的側(cè)向附著能力的需求保持穩(wěn)定的車輛駕駛。采用VDC系統(tǒng)，汽車在對開路面或彎道路面上的制動距離還可以進一步減短。
4. CCS汽車巡航控制系統(tǒng)
汽車巡航控制系統(tǒng)（巡航控制系統(tǒng)，簡稱CCS）是可以使汽車發(fā)動機工作在發(fā)動機良好的速度范圍內(nèi)，減少駕駛員操縱疲勞強度，提高駕駛舒適性的自動駕駛裝置。
汽車巡航系統(tǒng)（CCS）的作用是：按司機所要求的常閉開關(guān)之后，不用踩油門踏板就可以自動保持汽車行駛車速，使車輛以固定的速度行駛。在高速公路上長時間使用該裝置后，駕駛者不必控制油門踏板，減少疲勞，同時減少不必要的速度變化，可減少燃油消耗。
二、汽車被動安全技術(shù)
1．安全帶
汽車安全帶是一種安全裝置，它能在汽車碰撞或急轉(zhuǎn)彎時，使機組保持其原有的位置，盡可能不移動和旋轉(zhuǎn)，避免在汽車碰撞時造成損壞。座椅安全帶和安全氣囊，同是作為現(xiàn)代汽車的安全裝置，但是前者的歷史悠久，普及范圍廣。
看似簡單的安全帶其實并非“簡單”。注意力在交通安全的最前沿，通過對通用汽車再一次事故中的調(diào)查分析發(fā)現(xiàn)：安全帶不僅能保護人們的生命，而且能在一半以上的事故中減少甚至消除駕駛者，乘車者受傷的機會。汽車碰撞或突發(fā)緊急制動時會產(chǎn)生很大的慣性作用力，將會使司機、乘客、汽車擋風(fēng)玻璃、轉(zhuǎn)向盤、座椅之間發(fā)生二次碰撞，這是極其容易造成很嚴(yán)重的傷害，甚至將駕乘員拋離座位或拋出車外，而安全帶能將駕乘人員束縛在座位上。當(dāng)有事故發(fā)生時，可以有效地防止碰撞，而且它的緩沖作用能吸收大量動能，減少乘坐人員受傷的程度。
2．安全氣囊
在乘員使用座椅安全帶的情況下，氣囊有助于在嚴(yán)重性的碰撞中減少胸部，頭部和面部的傷害。當(dāng)汽車發(fā)生碰撞的時候，首先是汽車停止運動，汽車在慣性力的作用下迫使乘員以原來的速度向前運動。不系安全帶的乘員將與轉(zhuǎn)向盤、前擋風(fēng)玻璃發(fā)生碰撞，因此它可以造成嚴(yán)重傷害；系安全帶的乘員將隨著汽車停止運動而逐漸停止向前運動。如果碰撞劇烈，系著安全帶的乘員向前運動的速度更快，在運動停止之前仍然毀于車內(nèi)的東西發(fā)生碰撞。如果此時裝在轉(zhuǎn)向盤或儀表板內(nèi)的充氣氣囊彈出，它就可以保護乘員并減少乘員與汽車碰撞的可能性，更均勻的分散頭、胸的沖擊力，吸收乘員的沖擊能量，因此給乘員安全帶起到增值效應(yīng)。
三、汽車主動安全新技術(shù)
1．Eye Car技術(shù)
Eye Car技術(shù)可以使每一個司機眼睛處于同樣的相對高度，保證提供一個對路面和周圍車道的無阻礙視線和最佳能見度。這項技術(shù)還可以提供特定的駕駛環(huán)境。和最好的能見度。
2． Cam Car技術(shù)
Cam Car技術(shù)旨在幫助提高駕駛員的感知能力。
四、汽車被動安全新技術(shù)
1．未來安全氣囊
（1）充氣式屏幕系統(tǒng)。這是一種新的安全設(shè)計，它的基本原理是在汽車乘員的頭部保護，當(dāng)碰撞發(fā)生時，它就會進行充氣，充氣后的形狀呈帳篷狀。
（2）管狀充氣結(jié)構(gòu)頭部空氣囊。本系統(tǒng)為補充現(xiàn)有的側(cè)面保護系統(tǒng)，仍停留在保護胸部、腹部、臂部，但是對于頭部的保護比較不足。它采用車身剛體結(jié)構(gòu)，門體防護梁、側(cè)氣囊，可形成完整的側(cè)邊安全防護網(wǎng)，這將是未來的安全保護趨勢。
（3）頭部支撐系統(tǒng)。頭部支撐系統(tǒng)一般稱為頭枕，汽車座椅的頭枕不僅僅是為了乘員的舒適實際上更重要的是為了乘員的安全。車輛如果在緊急制動情況，車身會有很強烈的往復(fù)運動，因為慣性原理乘員的身體會跟隨車身擺動，尤其是對于脖子來說。如果沒有緩沖頭枕對頭部的支撐，頸部受傷所引起的傷害是非常令人驚訝的。
（4）外部安全氣囊。
2．自適應(yīng)約束技術(shù)系統(tǒng)（ARTS）
全新的自適應(yīng)約束技術(shù)系統(tǒng)（ARTS）使用了一系列的傳感器來監(jiān)測駕駛員座椅位置、安全帶的使用情況，以及前排乘員的乘坐質(zhì)量和乘坐位置以及發(fā)生碰撞時的碰撞強度和碰撞力的方向等，然后根據(jù)這些具體的信息，例如各前氣囊的特點，對乘員的安全。該系統(tǒng)可以進一步減少由于不適當(dāng)?shù)陌踩珰饽覍Τ藛T的傷害，特別是對于身材較小的乘員。
3．汽車吸能方向管柱
汽車吸能方向管柱通過碰撞再分配傳到方向盤上的沖擊力，沖擊力路徑提供分流快，使得方向盤上的負(fù)載最小。轉(zhuǎn)向柱由空心管和轉(zhuǎn)向軸承組成。傳統(tǒng)的空心管和轉(zhuǎn)向柱導(dǎo)向軸承是整體式的，轉(zhuǎn)向軸頂部與方向盤連接，下端與方向器連接。吸能方向管柱的特點是將整體式轉(zhuǎn)向柱，分為上轉(zhuǎn)向柱和下轉(zhuǎn)向柱兩部分；里面的轉(zhuǎn)向軸也分為兩部分，用萬向節(jié)機構(gòu)之連接。一旦發(fā)生碰撞使方向機構(gòu)產(chǎn)生位移，外向節(jié)下端特制的轉(zhuǎn)向軸會折疊，上轉(zhuǎn)向管柱移入下轉(zhuǎn)向管柱內(nèi)，達(dá)到“縮進”，從而擴大空間，減少損失。
五、胎壓力監(jiān)視系統(tǒng)
如何防止爆胎已經(jīng)成為安全駕駛的重要任務(wù)。據(jù)國家橡膠輪胎質(zhì)量監(jiān)督中心的專家分析，保持標(biāo)準(zhǔn)的輪胎壓力驅(qū)動和及時發(fā)現(xiàn)輪胎漏氣是防止爆胎的關(guān)鍵。輪胎壓力監(jiān)測系統(tǒng)（TPMS)----汽車輪胎壓力監(jiān)測系統(tǒng)無疑是理想的工具。該系統(tǒng)主要用于在汽車行駛時對輪胎壓力的實時自動監(jiān)測；對輪胎漏氣和低氣壓進行警報，以保證行車安全。
駕駛?cè)丝梢詮谋O(jiān)視器上知道每一個輪胎壓力值，當(dāng)輪胎壓力低于該規(guī)定的氣壓下限時，顯示器會自動報警。
總之，汽車主動安全技術(shù)和被動安全技術(shù)對汽車駕駛的安全性是非常重要的，此外，如環(huán)境因素、人為因素對汽車行駛的安全性也很重要。因此，我們必須準(zhǔn)備好各方面的要求和技術(shù)，以保證車輛行駛的安全性。
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