| دانلود رایگان مقاله انگلیسی + خرید ترجمه فارسی
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| عنوان فارسی مقاله: |
تجزیه و تحلیل تصادف از جلوی خودرو براساس نیروهای سازه ای |
| عنوان انگلیسی مقاله: |
Analysis of Vehicle’s Frontal Crash Based on Structures’ Section Forces |
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| مشخصات مقاله انگلیسی (PDF) | |
| سال انتشار | 2006 |
| تعداد صفحات مقاله انگلیسی | 4 صفحه با فرمت pdf |
| رشته های مرتبط با این مقاله | مهندسی مکانیک |
| گرایش های مرتبط با این مفاله | طراحی کاربردی، سازه بدنه خودرو، طراحی جامدات و مکانیک خودرو |
| مجله | کنفرانس بین المللی طراحی صنعتی و طراحی مفهومی به کمک کامپیوتر(International Conference on Computer-Aided Industrial Design and Conceptual Design) |
| دانشگاه | دانشگاه شمال شرقی شنیانگ |
| کلمات کلیدی | تصادف از جلو، جذب انرژی، نیروهای بخشی، شبیه سازی |
| لینک مقاله در سایت مرجع | لینک این مقاله در سایت IEEE |
| نشریه | IEEE |
| مشخصات و وضعیت ترجمه فارسی این مقاله (Word) | |
| تعداد صفحات ترجمه تایپ شده با فرمت ورد با قابلیت ویرایش و فونت 14 B Nazanin | 9 صفحه |
| ترجمه عناوین تصاویر | ترجمه شده است |
| ترجمه متون داخل تصاویر | ترجمه نشده است |
- فهرست مطالب:
چکیده
۱ مقدمه
۲ ایجاد حالت تصادف در وسیله نقلیه
۳ تجزیه و تحلیل جذب انرژی سازه
۴ تجزیه و تحلیل نیروهای بخش ساختار
۵ نتیجه گیری
- بخشی از ترجمه:
همه دستورالعمل برآورد تصادف از وسيله نقليه كه براي ايمني غيرفعال است ، مي تواند خوب باشد. كه كاملا به اندازه كافي براي تنظيمات تصادف است. به علاوه اعوجاج در فضاي كابين كوچك بوده است. به طوري كه سرنشينان مي توانند فضاي كافي را داشته باشند. انرژي در مدل تنها 6.8% از كل انرژي است كه نشان مي دهد محاسبات شبيه سازي مناسب است. جذب انرژي در جلوي ماشين كه يك اثر خوب باي جذب انرژي است،جذب بيشتر انرژي داخليرا دارد. طراحي بايد در راستاي بهبود باشد. چرا كه اثر كمتري در جذب انرژي دارد. اين يك مطالعه سودمند در مسير انتقال نيرو و روابط از دنباله جذب انرژي بوده كه توسط تجزيه و تحليل نيروي سازه اي در مدل تصادل تعريف شده است. همه اين دستاوردها بسيار ارزشمند براي تحقيق در مورد مدل تصادف مي باشد. تستهاي شبيه سازي شده و نتايج نشان مي دهد كه اين خودرو مي تواند در اين شرايط در محل تصادف بهبود يابد.
- بخشی از مقاله انگلیسی:
INTRODUCTION omputer simulations of vehicle collisions have improved significantly over the past few years. With advances in computer technology and non-linear finite element (FE) codes, full scale models and simulations of such sophisticated phenomena are becoming ever more possible. Finite element crash simulations have been primarily focused on the vehicle models and their crash characteristics. This allows direct evaluation of occupant risks and injuries using simulation data. Basing on the mimic crash numeric calculation theory [2], the complete finite element model of a integrated car-occupant restraint system including a dummy is set up. According to the CMVDR 294, the frontal crash is successfully simulated and the results including the vehicle’s the transmitting relation of the energy and the structure section forces in the process of crash, achieve comprehensive and credible appraisement with the frontal crash process and crashworthiness. It provides the theoretical reference for the studies of the crash process and the crashworthiness design of vehicles. II. ESTABLISHMENT VEHICLE’S CRASH MODE The establishment of crash finite element model is the key of analysis of crashing. We must consider the specific circumstances of the vehicle analyzed, and consult the criteria and predecessor’ experiences [1] [3] in order to make sure the model is reasonable. In this model, some questions are mainly considered. Element meshing: adopting the reducing integral element with hourglass controlling; making sure of the single direction of parts forming full integral element; controlling element sizes of crashing area between 5mm to 8mm., and element sizes of non-crashing area is about 10mm; the numbers of the triangle element take 9.2% of the total numbers of the element; the numbers of warping element take 10% of total numbers, and avoiding concentration of the warping element; adopting the regular meshing in the area of energy absorption; for parts of stamping, the change of shell element thickness is considered. Contact: taking effective measures aim at the distribution of contact pressure in order to avoid the problems of incipient penetration and side-to-side penetration, in dealing with the contact. Coupling and restriction: all kinds among connecting relation of the bolt, welding and so on, is correctly simulated and avoiding discontinuity of the relational curve about the spring force and its displacement. Material property: sheet metal component adopts the Multi-linear elastic plasticity Isotropic hardening material; Bumper adopts low density, rigid foam element and engine, suspension and braking system adopt stiffness solid element material, and the tire adopts elastic material; We must take the strain rate into consideration when defining material properties, because the distortion and strain rate of the skirts bend are both large in a short-time crash process. In the preprocessor of the Hype-Mesh in which is the finite element software, the complete finite element model of the integrated car-occupant restraint system is presented, as shown in figure 1. III. STRUCTURES’ ENERGY ABSORPTION ANALYSIS According to the CMVDR 294 law, under the MPP 970 edition of the LS-DYNA software, the frontal crash into a rigid wall of the car at about 48.3km/h is simulated. The whole calculation is carried through on the flat of Linux2.4.20 which is part of the workstation DELL PRECISION670, though the process of the crash costs 120ms, the CPU runs 15 hours and 22minutes. The simulation result of the frontal crash is shown as figure 3. The figure 2 shows of the whole vehicle structure deformation at the time 0ms, 40ms, 60ms, 75ms and 100ms. It can be seen clearly that the bumper, engine cover and the front of carline have generated large plastic deformation, extruding the front component of above them. And the front of carline which have shown large folding deformation takes effects in absorbing the energy. At the same time, the cockpit and the rear of the vehicle body haven’t shown deformation basically. The reason of the phenomenon is with the occur of collision, the front of the vehicle have taken great impact, so the impact energy is tremendous, and the momentum changes rapidly in a very short time, it forms impact force in a moment, and the number is very large. Greater plastic deformation is taken place because the stress surpasses the material yield stresses greatly when the front body of the vehicle suffered a great impact force. At the same time, it can absorb the impact force mostly, so the kinetic energy of the vehicle decreased and the number attenuates obviously, and the stress which effects on the occupant-cabin and the rear of the vehicle body also comes down, haven’t resulted in obvious deformation.
| دانلود رایگان مقاله انگلیسی + خرید ترجمه فارسی
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| عنوان فارسی مقاله: |
کاربرد نیروهای بخش سازه ای در آنالیز تصادف از جلوی خودرو |
| عنوان انگلیسی مقاله: |
Analysis of Vehicle’s Frontal Crash Based on Structures’ Section Forces |
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