Ahmadi, M. (2009). Study of the Frictional Surface Damage Using Acoustic Emission Method. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2(1), 47-55.
Mehdi Ahmadi. "Study of the Frictional Surface Damage Using Acoustic Emission Method". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2, 1, 2009, 47-55.
Ahmadi, M. (2009). 'Study of the Frictional Surface Damage Using Acoustic Emission Method', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2(1), pp. 47-55.
Ahmadi, M. Study of the Frictional Surface Damage Using Acoustic Emission Method. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2009; 2(1): 47-55.
Study of the Frictional Surface Damage Using Acoustic Emission Method
Associate Professor, Mechanical Engineering Department, Islamic Azad University, Dezful Branch
Abstract
In this study, the change at rubbing surfaces has been investigated experimentally using an acoustic emission signal monitoring system. A steel ring is slipped on the surface of a metallic sheet to simulate frictional conditions. The mechanical disturbances caused by the movement of the ring produce stress waves propagating along the sheet surface. The out of plane displacement of the sheet surface is sensed by a piezoelectric sensor. The electrical signal of the sensor output is received and used to analyze the frictional conditions between rubbing surfaces. The experimental results show that the effect of different frictional parameters such as normal load, surface material and lubrication on the surface damages can be recognized by analyzing the acoustic emission signals. For example, vanishing of the thin lubricant film between the two rubbing surfaces can be distinguished from the damage signals which are appeared with specific range of frequencies and amplitudes. The sensitivity of acoustic emission to detect frictional damages is considerably higher than that of monitoring of the friction coefficient.
استفاده از روش نشر اکوستیک برای مطالعه خرابی سطح در فرایند اصطکاک
Authors [Persian]
مهدی احمدی
دانشیار، دانشکده مکانیک، دانشگاه آزاد اسلامی واحد دزفول.
Abstract [Persian]
در این مقاله با استفاده از پایش سیگنال الکتریکی یک سامانه نشر اکوستیک، تغییر شرایط در سطح مالش مورد بررسی تجربی قرار گرفته است. اصطکاک با لغزش یک حلقه فولادی بر سطح یک ورق فلزی شبیه سازی شده است. در اثر حرکت حلقه، آشوب مکانیکی در سطح فلز ایجاد می‌شود که به صورت امواج تنشی در سطح منتشر می‌شود. با استفاده از یک حسگر پیزوالکتریک، جابه‌جایی ناشی از گذر موج تنش به صورت سیگنال الکتریکی دریافت می‌شود که از آن برای تحلیل وضعیت اصطکاک استفاده می‌شود. نتایج به‌دست آمده نشان می دهد که میزان تأثیر عوامل مختلف مثل نیروی عمودی، جنس مواد و استفاده از روانکار بر خرابی سطح را می‌توان با تحلیل سیگنال الکتریکی مشاهده کرد. به‌عنوان مثال، مطالعه سیگنال حاصل از مالش دو سطح نشان می دهد که با مضمحل شدن لایه نازک روانکار بین دو سطح، سیگنال‌های مربوط به تشکیل خرابی‌های میکروسکپی با دامنه و فرکانس معین ظاهر می‌شوند. حساسیت روش مورد استفاده برای تشخیص خرابی نسبت به روش پایش اصطکاک به مراتب بیشتر بوده و از این روش می‌توان برای پایش وضعیت سطح در فرایند اصطکاکی استفاده کرد
Keywords [Persian]
اصطکاک، نشر اکوستیک، سایش، پایش خرابی
References
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