Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1776-1783   

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  EXPERIMENTAL AND FINITE ELEMENT STUDIES ON FREE VIBRATION OF AUTOMOTIVE STEERING KNUCKLE
 
K. Reza Kashyzadeh, G. H. Farrahi, M. Shariyat and M. T. Ahmadian
 
( Received: August 12, 2017 – Accepted in Revised Form: September 08, 2017 )
 
 

Abstract    The main aim of this research is to determine the best material for manufacturing of steering knuckle in order to reduce the weight using aluminum alloy and Metal Matrix Composite (MMC). To achieve this purpose, the Modal test has been performed to study vibrational behavior of steering knuckle. CAD Model has been prepared by using coordinate measuring machine (CMM). Finally, the Finite Element Analysis (FEA) has been performed to evaluate natural frequencies and mode shapes of knuckle. The results of the Finite Element Model (FEM) have been compared with experimental data to validate the simulation. Three groups of materials (iron, aluminum alloy and metal matrix composite with different fiber volume ratio) have been investigated to determine the best material for manufacturing. DIN 1.7035, unreinforced alumina and MMC-Al 15% Ti-C have been reported as the best materials in each groups. The MMC material has higher vibrational rigidity and by using it, about 63.65 percent weight reduction is possible. FEM results for different models including Coordinate-Measuring Machine (CMM) and smooth model have been compared with test data. The CMM model is closer to reality and it contains all details such as barcode, data and surface defects. It is obvious that meshing of smooth surface is easier than CMM model, but some details will be ignored which could affect the results. However, it has been shown that use of CMM model creates about 5.21% errors related to test data in comparison with 2.58% when the smooth model is used.

 

Keywords    Steering knuckle, Modal test, Finite Element Analysis, CMM model, Natural frequency, Weight reduction

 

چکیده    هدف اصلی این پژوهش، تعیین بهترین ماده برای تولید سگدست خودرو به منظور کاهش وزن آن با به کارگیری آلیاژ آلومینیوم و کامپوزیت زمینه فلزی است. به منظور دستیابی به این هدف، آزمایش مودال برای بررسی رفتار ارتعاشی سگدست انجام شده است. مدل هندسی با استفاده از دستگاه اندازهگیری سه بعدی CMM آماده شده است. سپس، تحلیل المان محدود به منظور استخراج فرکانسهای طبیعی سگدست و شکل مودهای متناطر با آنها انجام شده است. به منظور اعتبارسنجی شبیهسازی، نتایج المان محدود با دادههای تجربی مقایسه شدند. سه گروه از مواد (آهن، آلیاژ آلومینیوم و کامپوزیت زمینه فلزی با درصد حجمی الیاف متفاوت) به منظور تعیین بهترین ماده برای ساخت سگدست بررسی شدند. فولاد DIN 1.7035، آلومینیوم تقویت نشده و کامپوزیت زمینه آلومینیومی با درصد حجمی 15% الیاف کاربید تیتانیوم به عنوان بهترین مواد در هر گروه گزارش شدند. کامپوزیت زمینه فلزی دارای صلبیت ارتعاشی بیشتری است و با به کارگیری آن، امکان 63.65% کاهش وزن وجود دارد. نتایج المان محدود به دست آمده برای مدلهای مختلف CMM و smooth با دادههای تجربی مقایسه شدند. مدل CMM به واقعیت نزدیکتر بوده و شامل تمام جزئیات، اعم از شماره بارکد حک شده و عیوب سطحی در قطعه است. مشخص است که مشبندی سطوح هموار به مراتب راحتتر از مدل CMM است. اما، برخی جزئیات در آن نادیده گرفته میشود که ممکن است در نتایج اثرگذار باشند. با این وجود، نشان داده شد که استفاده از مدل CMM منجر به خطای 5.21%و استفاده از مدل smooth منجر به خطای 2.58% در نتایج المان محدود در مقایسه با دادههای تجربی میگردند.

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