Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userThe method of determining the critical case expressing the possibility and validity of the continuation of the Internal combustion engines operating under normal conditions
طريقة تحديد الحالة الحدّية المعبّرة عن إمكانية و صلاحية استمرار محركات الاحتراق الداخلي بالعمل ضمن الشروط الطبيعية
985
1 3
0.0
(
0
)
Added by
Tishreen University ورقة بحثية
Publication date
2018
fields
Mechatronics
and research's language is
العربية
Authors
محمد صقر ديوب( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
تركز البحث على إيجاد طريقة تخطيطية تعتمد على قياس و مراقبة المؤشرات الأساسية لمحركات الاحتراق الداخلي العاملة بالانضغاط (محركات الديزل) من أجل تحديد الحالة الحدية لعمل المحركات، و التي تحدد الزمن المتوقع لكي يتم إرسال المحرك لإجراء صيانة شاملة له، أو لبعض أجزائه الأساسية. تمّ أبضاً تحديد نسبة الاهتراء الحاصلة لأحد عناصر المحرك الأساسية، و لقد تمّ اختيار قطر الاسطوانة و الاهتراء الذي يصيبها بهدف تحديد العمر الزمني للمحرك، و تحديد اللحظة الواجب إرسال المحرك فيها للصيانة الشاملة. من خلال مراقبة عدد كبير من المحركات التي وضعت في الإصلاح في المنطقة الصناعية بمدينة اللاذقية و التي عددها 30 محرك، من مختلف أنواع محركات الديزل و البنزين، و ذات الاستطاعات المختلفة، لوحظ أن حوالي 15% من هذه المحركات لم يتم استغلال و استثمار كامل مدة العمل المصممة لأجلها، و أن حوالي 20% منها قد توقفت عن العمل بعد فترة ليست طويلة بسبب الاهتراء الشديد الذي أصاب أجزاء و قطع و ميكانيزمات هذه المحركات مما أدى إلى تلفها و عدم استطاعتها القيام بعملها بشكل نظامي. و قد ساهم ذلك في زيادة استهلاك الوقود و مواد التزييت مما سيسبب لاحقاً ضرراً للاقتصاد الوطني. لقد أثبتت الطريقة التخطيطية المقترحة لتحديد الحالة الحدية للمحرك عند مقارنة النتائج التخطيطية مع نتائج الاختبارات العملية للمحركات فعاليتها و دقتها و بنسبة خطأ لم يتجاوز %6 مما يسمح بتطبيقها و اعتمادها كطريقة فعالة لتحديد العمر الزمني الفعلي للمحرك و مقارنته مع العمر الزمني لاستثمار المحرك المنوه عنه في كتالوكات الشركة الصانعة و ذلك عند ظروف تشغيل طبيعية و نظامية للمحرك.
The research focuses on finding planning methods based on measuring and monitoring the basic indicators of internal combustion engines (Diesel engines) in order to determine the critical case of the engines, which determines the expected time for the engine or for some of its basic parts to be sent for comprehensive maintenance. The wear ratio of one of the basic components of the engine was also determined, we also chose the diameter of the cylinder and the corrosion that happens to it in order to determine the engine's lifetime and determine the moment when the engine should be sent for comprehensive maintenance. By observing a large number of engines put in repair in the industrial area in Lattakia, which are 30 engines of different types of diesel and gasoline, and with different capacities, it was noticed that about 15% of these engines were not exploited and invested the entire work period designed for them. Also it was noticed that 20% of them have stopped working because of the severe corrosion of parts, components and mechanics of these engines, which led to their damage and their inability to do their work on a regular basis. This has contributed to increased consumption of fuel and Lubricating materials, which causes damage to the national economy. The proposed planning method for determining the critical case of the engine when comparing the schematic results with the practical results of the engines has proved its efficiency and accuracy with an error rate of no more than 6% This allows it to be applied and adopted as an effective way to determine the actual lifetime of the engine and compare it with the life time of investing the engine mentioned in the manufacturer's catalogs when operating the engine under normal conditions.
References used
PROF. ROLF D. REITZ. Internal Combustion Engines, Fundamentals and Performance Metrics. Engine Research Center- University of Wisconsin-Madison; 2018 Princeton-Combustion Institute
SANDRA L. BELL. Internal Combustion Piston Engines. U.S. Customs and border Protection; April 2012
Turesson, Gabriel. Model-Based Optimization of Combustion-Engine Control Department of Automatic Control. Lund Institute of Technology, Lund University 2018
rate research
Read More
The research focused on the conclusion of a mathematical model to determine the
proportion of nitrogen oxides emitted from the internal combustion engine based on the
equations of chemical interaction of direct and reverse the conventional fuel wit
h the use of
many of the correction coefficients, as well as the possibility of developing this model.
Search to find out the concentration of nitrogen oxides NO changes resulting from the
combustion of fuel in internal combustion engines that run on diesel fuel and gasoline
adopted, during work time, and then transform this relationship to calculate the ratio of the
concentrations according to the angle of rotation of the engine crankshaft.
This study ains for the ability of using granite waste emerged by sawing granite in
Syria, which is considered as a negative effect on the environment , which pollutes the air ,
people, animal and planit. The chemical composition of granite waste w
as defined and it
was clear that it is same as the chemical composition of glass . so we did this work by
transforming the waste caused by granite sawmills to the glassy state.
The preparation for the glassy states were done py two methods , the first by adding
sand and sodium carbonate and second by adding borax and sodum cab ronate and the
heattreatment was done at (900-1000 c) . The assurance of getting the glassy state through
the XRD measure to the resulted samples was done . and the chemical composition of glass
resulted by alkaline melting way was identified , then doing the chemical analyses needed
to signify the percentage of oxides of the elements and in the second step of the worke ,
they have made tests on the resulted glass (its intensity, its resistance of acids and bases ).
The decrease of intensity was noticed by the increase of silica concentration , sodium
oxide and borates oxide , and it was noticed the increase of the resistance to the acids and
alkalis by the increase of silica concentration and sodium oxide , but through adding the
borates, the result was a glass less resistant to the acids and bases .
There have been numerous studies dealing with the environmental and social aspects of the
type of buildings with internal courtyards, through studying the functions of the internal
courtyard, environmental, utilitarian, social and formative. but th
ese studies did not address
the importance of internal courtyard in achieving the ease of spatial orientation, through its
role in easy access to the space required In buildings in general, and in university buildings
in particular.
The research starts from the following hypothesis: The morphological and Syntactical
characteristics of the internal courtyard of the university buildings affect the ease of
orientation of the users, and aims to identify these characteristics that achieve easy access
to the goal. For this purpose, including theoretical and practical colleges, where a special
description of the morphological characteristics of the internal courtyard in the university
buildings, and determinants that help the designer in the use of the internal courtyard in
designing of spatial configurations of the university buildings to achieve the ease of spatial
orientation.
We offer in this approach the integration of search engines with filtering techniques, through the
dynamic relationship of hybridization between collaborative filtering and content based filtering in
order to solve the past limitations and improve
precision and recall of retrieved documents. The
approach uses Domain ontology model in the representation of user profile to reduce errors and
confusion resulting from consideration for user profile as a single entity, as well as taking advantage from
user activity for adaptation of user profile to reflect the state of user.
Rural areas form a large part of Syria's coastal area. Linking between these areas and city
centers transact of a network of roads. Each of these roads and transport means form the
rural transport system which characterized by general characteristi
cs of low levels of
traffic, economic activity and population density, and long distances between centers such
as service centers. The presenting of services, operations and maintenance characterize at
high costs, and there are often difficult geographical and natural conditions.
Vehicle operating costs refer to costs that vary with vehicle usage, including fuel, tires,
maintenance, repairs…etc., which dependent on the mileage.
Transportation agencies and maintenance workshops were visited during this study. As
well as, interviews have been done with a random sample of public transport drivers
working on some rural axes in the coastal area, in order to obtain the required information
about the vehicle operating and maintenance costs.
The study concluded by identifying the most important factors that may effect on the tariff
of passenger transport on rural axes (maintenance of the vehicle, fuel costs, quality of the
road .....) and proposing a number of recommendations aimed at improving the public
transport system and raising its efficiency in rural areas.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
