تشخیص عیوب ابعادی و ترک سوپاپ به کمک بینایی ماشین و آکوستیک امیشن

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

عضو هیئت‌علمی، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.

10.48301/kssa.2023.391572.2501

چکیده

سوپاپ یک کلمه فرانسوی (Soupape) به معنی دریچه می‌­باشد و نقش آن کنترل مخلوط هوا و سوخت ورودی به موتور و همچنین کنترل دودهای خروجی از آن می‌باشد. در این تحقیق تشخیص عیوب ابعادی و ترک سوپاپ به کمک بینایی ماشین و آکوستیک امیشن انجام شد. بعد از انتقال آفلاین تصاویر به نرم‌­افزار متلب، پردازش تصاویر در آن انجام شد و پارامترهای ابعادی سوپاپ مانند طول، قطر ساق، قطر بزرگ (نشیمنگاه) و کجی ساق سوپاپ در آن اندازه‌­گیری شد. این پارامترها با اندازه‌های واقعی مقایسه و درصد خطای اندازه­‌گیری برای این پارامترها به ترتیب 45/0­، 8/1 و 18/1 درصد برآورد گردید. برای کجی ساق سوپاپ با توجه به این‌که در حالت واقعی روشی جهت اندازه­‌گیری وجود ندارد درصد خطا برای این پارامتر محاسبه نشد. برای تشخیص ترک از 60 عدد سوپاپ نو مشابه، توسط دستگاه AE-MAP 1.0 نمودار آکوستیکی تهیه شد و نمودار آکوستیکی 30 سوپاپ نو و کارکرده با آن مقایسه شد. دقت سیستم در تشخیص ترک تقریباً 7/96 درصد برآورد گردید. 

کلیدواژه‌ها


عنوان مقاله [English]

Diagnosing Dimensional Defects and Valve Cracks using Machine Vision and Acoustic Emission

نویسندگان [English]

  • Bahman Rahmatinejad
  • Hossein Rahimi Asiabaraki
  • Farzin Azimpour Shishevan
Faculty Member, Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran
چکیده [English]

Valve originates from the French word, Soupape, meaning valve and its role is to control the mixture of air and fuel entering the engine and the exhaust fumes. In this research, dimensional defects and valve cracks were diagnosed with the help of machine vision and acoustic emission. After offline transfer of the images to MATLAB software, the images were processed and the dimensional parameters of the valve such as length, stem diameter, large diameter (seat) and valve stem curvature were measured. These parameters were compared with the actual sizes and the percentages of measurement error for these parameters which were estimated as 0.45%, 1.8% and 1.18%, respectively. Because there was no real way to measure the valve stem, the error percentage was not calculated for this parameter. To detect cracks from 60 similar new valves, an acoustic diagram prepared by AE-MAP 1.0 device and the acoustic diagram of 30 new and used valves were compared. The accuracy of the system in crack detection was estimated to be approximately 96.7%.

کلیدواژه‌ها [English]

  • Machine Vision
  • Dimension Measurement
  • Image Processing
  • Valves
  • Acoustics
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