| عنوان فارسی مقاله: | مشتق گیری از شرایط با ویژگی قبل از قفل شدن بر اساس روش نظارت بر سیستم کلاچ در جعبه دنده اتوماتیک |
| عنوان انگلیسی مقاله: | On the derivation of the pre-lockup feature based condition monitoring method for automatic transmission clutches |
| دانلود مقاله انگلیسی: | برای دانلود رایگان مقاله انگلیسی با فرمت pdf اینجا کلیک نمائید |
| سال انتشار | 2014 |
| تعداد صفحات مقاله انگلیسی | 15 |
| تعداد صفحات ترجمه مقاله | 25 |
| مجله | سیستم های مکانیکی و پردازش سیگنال (Mechanical Systems and Signal Processing) |
| دانشگاه | فناوری و مکاترونیک اورله، بلژیک |
| کلمات کلیدی | اصطكاك مرطوب صفحات ، گير بكس اتوماتيك ، نظارت بر وضعيت ، مدت زمان ارتباط ، فاصله لغزشي |
| نشریه | Elsevier |
فهرست مطالب:
چكيده
1 مقدمه
1 1 اصطکاک و مکانیزم شکست
1 1 1عملکرد و اساس کار
2 1 1 الگوي شكست در اصطكاك مرطوب
مكانيسم ها و تخريب از مواد اصطكاكي
2 1 شرح مسئله
3 1 هدف
4 1 سازماندهي مقاله
2 روش نظارت بر وضعيت كلاج براساس ويژگي هاي قبل از قفل شدگي
3 توسعه نظري
1 3 اشتقاق قبل از قفل شدگي
2 3 تجزیه و تحلیل ویژگی ها
1 2 3 تجزیه و تحلیل هم بستگی
2 2 3 تجزیه و تحلیل حساسیت
4 نتایج تجربی و بحث
5 نتیجه گیری
بخشی از ترجمه:
شکل 8 تکامل ویژگی های نرمال و میانگین COF را نشان می دهد . همانطور که در شکل دیده می شود ، پس از10000 چرخه از لحاظ نظری ، این کار برای 4پیش بینی اجام شده است . اما تغییرات مطلق نرمال میانگین بزرگتراز ویژگی نرمال است با این حال تغییرات مطلق نرمال پس از 10000 دوره نتایج معادله 17 را تایید می کند .
4-2 : تجزیه و تحلیل همبستگی
به منظور بررسی روابط نظری بین ویژگی های COF ، مورد بحث ضرایب همیشگی بوده و با توجه به معادله 8 مقادیر مختلف ALT محاسبه شده است .
5 : نتیجه گیری :
ریشه و پایه نظری برای این مقدار اصطکاک ارائه شده
اين است كه از لحاظ نظري ، نشان داده شده است كه اين دو ويژگي پيش از توقيف با ميانگين ضريب اصطكاك ، تناسب معكوس دارد . به منظور بررسي پيش بيني هاي نظري ، ضريب همبستگي پيرسون براساس داده هاي تجربي محاسبه شده است و نشان مي دهد كه داده ها ي تجربي ، مقادير مناسبي دارند . مقادير ضريب بسيار نزديك به يك بوده و در نتيجه تأييد پيش بيني هاي نظري را دارد . به منظور دستيابي به يك روش دقيق نظارت بر وضعيت ، آن است كه به لحاظ نظري نشان داده شده كه تغييرات برخي از متغير هايي عملياتي شامل دماي روغن و فشار و سرعت چرخشي نسبس اوليه ، بايد به عنوان مقادير كوچكي نگه داري شوند . براي پياده سازي عملي اين را مي توان با تغيير برخي از كنترل ها در واحد ECU انجام داد كه مي تواند نياز فوق را برآورده سازد .
بخشی از مقاله انگلیسی:
1. Introduction Vehicles have become indispensable utilities in our modern society. Designs of vehicles have evolved from basic transportation utilities into advanced modern vehicles that can satisfy the increasing demands of the society for safety, driving comfort, high energy efficiency, low cost, high power capacity, etc. In a vehicle, a transmission system is one of the key devices that is responsible to accomplish the aforementioned requirements. A transmission system is defined as a device having the function to transfer power from the engine to the wheels, via the axles. The increasing sophistication of modern vehicles is also accompanied by the growing complexity of the transmission system. In recent years, original equipment manufacturers (OEMs) have launched different types of transmission on the automotive market which can be, in general, classified into two main groups, namely (i) manual systems and (ii) semi or fully automatic system. A manual system consists of traditional Manual Transmission (MT), while the automatic system can be of different types, such as traditional Automatic Transmission (AT), Automated Manual Transmission (AMT), Continuously Variable Transmission (CVT), and Power Shift Transmission/Dual Clutch Transmission (DCT). As is obvious from its name, an automatic system is a transmission that shifts power or speed by itself, while the manual system involves the driver to do so. Fig. 1 shows the annual sales ratios of manual and automatic systems with respect to the total annual sale of all transmissions from the years 2001 till 2015 [1,2]. The trends reveal that the drivers0 perspective has changed since the last decade. It is also obvious from the figure that the global economic recession occurring in 2008 and 2009 impacted the customers0 response on the selection of the transmission, which seemed to be only temporarily. Vehicles with manual Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/ymssp Mechanical Systems and Signal Processing 0888-3270/$ – see front matter & 2014 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.ymssp.2013.12.015 n Tel.: þ32 16 32 80 42; fax: þ32 16 32 80 64. E-mail addresses: agusmian.ompusunggu@gmail.com, agusmian.ompusunggu@fmtc.be URL: http://www.fmtc.be Mechanical Systems and Signal Processing 46 (2014) 114–128 Downloaded from http://www.elearnica.ir systems have dominated the global automotive market for decades. However, the demand for the manual system is on the wane; and as predicted, the automatic systems will be dominating the global automotive market after the year 2012. This tendency is probably due to the fact that automatic systems offer more attractive capabilities that can satisfy the demands of our dynamic society, compared to the manual system [3]. Despite gaining popularity, there are some issues in automatic transmission systems that have been addressed and been attracting attention of many researchers across the world, namely energy efficiency improvement, emission reduction and driving performance enhancement. Modeling and simulation of the automatic systems have been carried out by many researchers in order to better understand the transmission behavior [4–7]. This understanding can serve as a basis for optimizing the transmission design and developing control strategies. Different advanced control strategies for automatic systems have been proposed in the literature, for example see Refs. [8–12], mostly focusing on improving fuel economy and enhancing gearshift quality. Although considerable solutions related to the above-mentioned issues have been achieved, nevertheless, maintenance aspects were overlooked and they recently gain attention [13–16]. In fact, maintenance has also to be regarded as an important issue for the development of reliable automatic systems. An appropriate maintenance strategy on these transmissions is a necessity because of their vital function in the vehicles. While the complexity of automatic systems increases, the requirement for a maintenance strategy becomes more crucial. Undoubtedly, inevitable degradation occurring in the transmissions can change the vehicles0 performance. As the degradation progresses, failure can unexpectedly occur, which eventually leads to the total breakdown of the vehicles. Therefore, integration of a maintenance strategy into automatic transmission systems can significantly increase safety and availability/reliability and reduce the maintenance cost of the vehicles. Condition Based Maintenance (CBM), which is also known as Predictive Maintenance (PdM), is a right-on-time maintenance strategy which is driven by the actual condition of the critical component(s) of any systems of interest. This concept requires technologies and experts, in which all relevant information, such as performance data, maintenance histories, operator logs and design data, are combined to make optimal maintenance decisions [17]. It has been realized that this maintenance strategy can significantly increase safety and availability/reliability and reduce the maintenance cost of systems of interest. PdM has been in use since 1980s and successfully implemented in various applications such as in oil platforms, manufacturing machines, wind turbines, automobiles, electronic systems [18–23]. In general, the key technologies for realizing the PdM strategy rely on three basic ingredients, namely (i) condition monitoring, (ii) diagnostics and (iii) prognostics. Condition monitoring (CM) aims at assessing the condition of a system/ component of interest by means of tracking the change of a parameter that indicates a degradation progress. In the PdM research community, the parameter to be monitored is often referred to as a relevant feature. Diagnostics helps the maintenance engineer to localize and identify the fault type in a system/component. Finally, prognostics aims at predicting the remaining useful life (RUL) of a system/component at which the system/component will no longer perform its intended function. The RUL is estimated by means of forecasting the time interval needed by the feature to reach a pre-defined threshold that represents the end-of-useful life. Hence, (1) a feature to be monitored, (2) a degradation model which can be heuristically or physically derived, and (3) a threshold are critical aspects to succeed in development of the PdM strategy. To realize the PdM strategy for automatic transmission systems, the critical component(s) therefore needs first to be identified. Afterwards, the condition monitoring, diagnostics and prognostics system for the critical component must be developed. For automatic transmission systems, wet friction clutches are one of the critical components. This consideration is based on the fact that the performance and long-term durability of such transmission systems are strongly determined by the clutch [24]. A brief introduction of wet friction clutches comprising the working principle and typical failure modes is discussed in Section 1.1.
| عنوان فارسی مقاله: | مشتق گیری از شرایط با ویژگی قبل از قفل شدن بر اساس روش نظارت بر سیستم کلاچ در جعبه دنده اتوماتیک |
| عنوان انگلیسی مقاله: | On the derivation of the pre-lockup feature based condition monitoring method for automatic transmission clutches |
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