بررسی جذب انرژی در جزء فداشوندۀ لکوموتیو ER24PC زیمنس

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه علم و صنعت

چکیده

در اکثر وسایل نقلیه برای جلوگیری از خسارت‌ها و یا کاهش آن از سیستم های جاذب انرژی استفاده می شود. در این مقاله جذب انرژی در جزء فداشوندۀ لکوموتیو ER24PC زیمنس مورد بررسی قرار گرفته است. پس از معرفی و نحوۀ عملکرد این قطعه در حین برخورد، مدل‌سازی آن در نرم افزار آباکوس انجام شده و خصوصیات برخورد آن مورد ارزیابی قرار گرفته است. با توجه به این‌که شکل جزء فداشوندۀ لکوموتیو زیمنس هرمی است به‌منظور بررسی صحت نتایج حل عددی از یک حل تحلیلی استفاده شده است. در ادامه به‌علت این‌که ضخامت ورق جزء فداشونده زیاد است و در حین برخورد ممکن است پاره شود استفاده از مدل آسیب مناسب در شبیه سازی های عددی ضروری است. از سه مدل آسیب استفاده شده در این مقاله، یک مدل آسیب در خود نرم افزار وجود دارد و برای دو مدل آسیب دیگر کدنویسی انجام شده است و با مقایسۀ نتایج حل عددی با نتایج تست آزمایشگاهی مدل آسیب مطلوب مشخص شده است. به‌علاوه صحت مدل آسیب مطلوب از طریق استاندارد ECE R 66 بررسی شده است. سپس برای بهبود جذب انرژی در طی برخورد از فوم های فلزی به‌عنوان جاذب انرژی استفاده شده است. در نهایت عملکرد جزء فداشونده پرشده از فوم با جزء فداشوندۀ خالی مقایسه شده و عملکرد و بازدهی فوم داخل جزء فداشونده مورد ارزیابی قرار گرفته است.

کلیدواژه‌ها


عنوان مقاله [English]

Study of Energy Ebsorption of Crushing Element in ER24PC Locomotive

نویسندگان [English]

  • Parisa Hosseini Tehrani
  • iman ferestade
Iran University of Science and Technology
چکیده [English]

In most engineering structures the energy absorption systems are used to prevent or reduce damages. In this paper, performance of a crushing element of ER24PC locomotive is investigated. The numerical modeling of this crushing element, after introducing its operation, is performed using the Abaqus finite element software in order to evaluate its crushing characteristics. Since the shape of crushing element of ER24PC locomotive is tapered, an analytical solution has been used to validate the numerical results. Because of the thickness of crushing element, rupture may be occur in this element and using of a proper damage model is essential in order to simulate this rupture. From three damage models introduced in this paper, one damage model is already provided in Abaqus and the other two models have been coded. By comparing numerical results with experimental test results, proper damage model in software is developed and used in order to properly simulate the crashing process of considered element. The desirable damage model is verified by using ECE R66 standard. Finally in order to improve the energy absorption capacity metallic foam is used as a filler in energy absorber element. Through comparing the energy absorption behavior of foam filled crushing element with the non-filled element the foam performance in crushing element is evaluated.

کلیدواژه‌ها [English]

  • Energy absorber
  • crushing element
  • damage model
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