الهدف الأساسي من صيانة و إصلاح المعدات و الآليات أثناء فترة الاستثمار هو تخفيض كمية الأموال المصروفة من أجل المحافظة على صلاحية عملها في مختلف ظروف الاستثمار المحددة (نوعية مواد التصنيع، الطرق المستخدمة، درجات الحرارة، طبيعة الاستثمار،. .الخ).
يمكن تحقيق هذا الهدف عندما نتحكم بتحولات الحالة الفنية للقطع الاحتكاكية للمعدات خلال فترة الاستثمار, و معرفة القوانين الفيزيائية التي تتحكم بالانحرافات الفنية لها، لذلك قمنا بدراسة المخططات النظرية للاهتراء الجاف للفرامل لوسائل النقل انطلاقا من مخططات الاهتراء الرطب (الزيتي) للقطع الاحتكاكية في الآليات، و من هذه المخططات قمنا بدراسة العلاقات الفيزيائية المحددة لكثافة الاهتراء و سرعته و تسارعه خلال فترة الاستثمار و مرحلة التشغيل غير الموثوق (غير الآمن)، مع الأخذ بعين الاعتبار الأساليب المتبعة في الصيانة التكنيكية الدورية و طرق القيادة و متوسط مرات استخدام الفرامل و ...الخ.
من خلال العلاقات التي حصلنا عليها، يمكننا التنبؤ ببدء مرحلة عدم فعالية الفرامل (البطائن الاحتكاكية) و توقيت بدء مرحلة التشغيل الخطر (غير الموثوق)، الذي يعطينا مؤشراً للاستبدال أو المعالجة بالطرق الميكانيكية و الكيميائية المعروفة.
The main goal of maintaining and repairing equipment and machines during the
investment stages is to reduce the amount of money spent in order to maintain the validity
of their operation and the quality of their reliability under the different given investing
conditions (type of manufacturing materials, methods used, temperatures, nature of
investment, …. etc).
This goal can be achieved if we are able to control changes in the technical
conditions of equipment and the frictional parts during the investment stages, besides
knowing the physical laws/rules that govern the technical changes properly. Therefore, we
carried out a study on the theoretical plans of physical wear of brakes and the frictional
parts in means of transportation. This is done starting from wet (oily) wear plans of the
frictional parts in machines. Then, based on these plans we studied physical laws/rules
determining the intensity of dry wear of brakes, along with its speed and acceleration
during the investment and the unreliable, uneconomical (unsafe) operation stages, taking
into consideration the methods used in periodical technical maintenance, ways of driving,
and the average number of times brakes are used…etc .
Based on these formulas obtained, we can estimate/predict the start of ineffectiveness
of brakes and friction linings, in addition to the inception time of risky (unreliable)
operation stage. Consequently, this stage gives us indications for replacement or treating
with the traditional (known) mechanical and chemical ways, in light of the soaring prices
of materials in the Syrian Arab Republic.
References used
OZDALYAN ,B . Development of a slip control anti-lock braking system model. International Journal of Automotive Technologe .Vol. 9, No. 1 , 2008 , pp.71-8o
Wigel. Segmer , The parking problem, "international road safety and traffic review". London.1960
Olson, W. and Milacic, D. (1996). Development of antilock braking traction and control systems of the advanced technology demonstrator II using DADS simulation code. Int. J. Vehicle Design 17, 3, 295-317
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