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USE OF SPLINE FUNCTIONS IN DETERMINING RELIABILITY INDICATORS OF VEHICLES IN
HOT CLIMATE CONDITIONS
Kayumov B.
Andijan Machine-Building Institute, PhD in Technics
Abstract
The article presents the possibilities of determining reliability indicators and plotting graphs as a result of processing the test results of cars in a hot climate using spline functions. Based on the results obtained, conclusions are drawn.
Keywords: Hot climate, reliability, spline function, vehice, engine, fuel injection system.
For automobile manufacturers, the problem of improving the reliability of automobiles and parts takesa leading role in the operation process. Given that the total number of vehicles in use is more than one billion, it is in developed foreign countries, includingthe United States, Japan, Germany It is no secret that in countries such as France, there is a systematic monitoring of the performance of automobiles without disrupting them. In this regard, there is a special emphasis on forecasting and improving the reliability and competitiveness of the structural elements of automobiles.
To increase automobile reliability and reduce operational costs, as well as to obtain great economic efficiency due to reduced costs in the automobile use process, Improving automobile reliability is of particular importance. To assist individuals desiring to benefit the worldwide work of Jehovah's Witnesses through some form of charitable giving, abrochure entitled Charitable Planning to Benefit Kingdom Service Worldwide has been undertaken. developing and modeling the laws governing dismissals that occur in elements that limit reliability is oneof the most important tasks.
A number of scientists in our country have dismissed the engine and fuel supply system, air and fuel pollution, which are used in various climatory conditions, To determine the negative effects, Salimov A., Translation S. M., Avliyakulov N. X., Karimhodhokhanov N., Tashpulatov M. M., and a
number of other scientists have done research [1,2,8,9,11,13,14,17].
Regardless of the impact of climate regions on automobile use as a result of pollution in air and fuel, Sheynin A. M., Grigorev M. A., Gurevich D. F., Dmitrievskiy A. V., Kislov V. G., Kosteskiy B. I., Vasilev A. V. Scientists such as [3.4,5,10,12].
Central Asian road-comprehensive analysis of the specific features of vehicles in operation in climatic conditions and studying the main factors affecting the reliability of the engine and its systems. Vehicles to be exploited in the regions of Uzbekistan operateat high air temperatures and dust. The climate of Central Asia is severely continental, summer is persistent and very hot, and winter is short and cold. The absolute maximum temperature of the shadowy air during the day is +45... It dropsto 47 0S and +100S at night, and the temperature changes for 8 hours 25... It can reach 30 0S, andin the mountainous regions, after the very heat of the car +40...470 S, there is an atmospheric temperature passing through the mountainous vans -no 0...+10S fallsinto conditions with a sharp temperature change of 40... It is 460S [15].
The temperature dropped to about minus 10 degrees Fahrenheit [-70°C] and the temperature dropped to about minus 10 degrees Fahrenheit [-70°C]. The temperature of the road cover is raised to +850S,
especially when the organism is treated with adhesive material.
Gasoline in the automobile's fuel fields is a sharp increase in the level of pollution in the air, and pollutants are made up of dust on the roads, which are of an abrasive nature. The air dust of the Central Asian atmosphere can reach up to 3.5 g/m3, and during storms and harsh winds, it can increase to 17 g/m3, In turn, ten or more times higher than the temperature of the temperate climate region (0.0003...1.4 g/m3). To imagine this, the dust of the air is 0.8... When it is 1.2 g/m3, our ability to see is lost. Contaminant mixtures that fall into the engine along with fuel reducethe performance of its supply system, resulting in system elements being disrupted and intensively eaten observed. Gasoline engines under the influence of high environmental control are the most descriptive types of outages in the supply system, the formation of wheat probes, the engine The resulting embryo was allowed to nutrients and then inserted into her womb, where it implanted [16].
The main advantages and disadvantages of the elements of the injector supply system of engines have been identified, as well as their development and application in modern engines. The technical condition of the engines depends primarilyon the climatic conditions of the road and the quality of fuel lubricants.
The Central Asian road- becausethe impact ofcli-matic conditions on the operation of elements of the automobile engine's injectable supply system has not been adequately studied, conducting research on reliability is a matter of urgency and prohibitsit from being resolved on a scientific basis.
Uzbekistan's road-climatic conditions are heavily calculated for automobile exploitation. These are the lowlands, the highlands, the deserts, and the lowlands. For their characteristics are the droughts of the places, the abundance of dust, the heat of the surroundingclimate, and the long lasting years.
Analysis has shown that elements of the gasoline engine supply system often eat details under the influence of abrasive particles containing contaminated fuel, as well as fuel when low-quality fuel is used the resulting embryo was allowed to develop in nutrients and then inserted into her womb, where it implanted.
The results of the study of the issue show that the operational reliability of the injector supply system is particularly affected by the road-climatic conditions of the region.
The results of expressive and theoretical research have been developed on the details and extensions of the engines based on injective shaving of fuel. Based on an analysis of the types of layoffs: Theoretical laws governing the occurrence of dismissals have been created; the connection between the road traveled by the car and the intensity of the discharge. An EHM software product has been createdthat models the
likelihood of gasoline engines being discharged from the injector supply system.
Gasoline engines are classedfor the outage of the injector supply system. The description and nature of the work that happens in the injector supply system is revealed.
A functional analysis of leaks has been studied and presented in the elements of the injector supply system. In the elements of the supply system, there have been considerations of the variants of the types of distribution of random sizes of work.
The process of technical change for the details and extensions of the injector supply system depends on the distance traveled by the car or the time the system works, andthe character of the discharge is monotonous. That is, in this case, we canexplain the parameters for changing the technical state of the system in the form of a whole second-order rational function, i.e. [6.7]:
y = aQ + axl + a2l + a^l +... + anl (1)
Here, ao — the initial valueof the system technical harrow parameters;
a], a2, a3,... an — coefficientsthat determine the character and level of the technical state (l) variation depending on the distance (l);
l is the time the distance or system is working.
Preliminary theoretical conditions have been created for analytical evaluation of the reliability of the injector supply system for gasoline engines in operational conditions in hot and dusty regions of Uzbekistan. The laws adopted to evaluate the rate at which the engine injector supply system does not go out of business have been approved by experimental studies conducted in the region of Uzbekistan in conditions of simple operation of cars.
Statistically, the resultsof operational surveillance of controlled vehicles were processedto determine the laws governing the distribution and intensity of the fuel supply system. The results of statistical processing of operational data are well approximated by the law of normal distribution of the distribution density of injector supply system elements from work, as accounting and experimental data curves can be seen ina 1-rasm.
The calculations were carried out according tothe following formula, at the level of importance of
a=0.1:
f (l) =
1
e
(i-i )2 2CT2
¿xV
Elements of the injector supply system have developed a modeling method by using advanced methods of analyzing the densityof distribution, the analysis of data.
(2)
0,3 0,25 g 0,2 1 0,15 in0,1 0,05 0
35,7 70,2 104,6 139
Distance traveled before departure, thousand km
1 pic. Distribution density histogram ofpetrol engine injector supply system fuel pump failures: 1- on the basis of data from operational observations; 2 calculation curve.
The question of building a splayn by experimental data is to find the bt coefficient, andin general the splayn set isA determined.
b i use a system of linear equations to determine coefficients
b-i B-i (x0) + b0 B-o (x0) + b1B1 (x0) = f\ x0) ■ h
b,-i B,-i(x,) + b,B,(x) + b, +B+1(x,) = f(x,)
bN-1 BN-1( X ) + bNBN ( X ) + bN+1BN+1( x,) = f ( x,) • h
(3)
here h=xi+1-xi - interpolyatsior step; f (x0) and f (x N ) - the yield of function at the end of the set.
b = b( f (x)) coefficients canbe obtained by calculating by the formula in the view. These formulas are intended to be presented in preparation, for thereis an opportunity to reduce the size of the calculation opera-
b = 1 (-f -1 + 10f - f+1 ) (4)
o
2) Five-point formula:
b = ^ (f - 2 - 12f -1 + 86f - 12f+1 + f+2 ) (5)
Taking into account the aforementioned situations
tions. We call the following formulas ^-point. For sec- and analytical actions, gasoline engines use splayn-
ond-order splayns :
1) Three-point formula:
0,35 y 0,3 -0,25 -0,2 -0,15 -0,1 -0,05 0
functional methods to investigate the failure of the injector supply system Modeling software has been created.
M
S
«
<u _=3
*ês №
0
24,15 39,05 53,95 68,85 83,75 98,65 113,55
Distance traveled before departure, thousand km
Figure 2. Distribution density of injector supply system malfunction intensity according to spline-function
program [19]:
1-operation; 2 processed by the law of normal distribution; Developed with 3 spline functions.
Based on operational tracking data of the research, the results of the splayn- processed by function program are presentedin figure 2in a graphical view. Analysis splayn-the initial data processed using the function method, the closest to the operational information regarding data processed by the law of normal distribution that it is.
As a result of the research, we may conclude that : In the form of high temperatures and dust of air, half of the total output from the engine corresponds to the supply system. More than 50% of the supply system's elements were foundto be caused by the formation of food layers in the details of fuel apparatus and fuel pollution. As a result, the automobile fuel supply system has shown that it is necessary to revisit the methods of assessing the indicators of operational reliability [14,16,18].
Distribution of outages that match the function of the normal distribution law based on the integration and analysis of statistics on the reliability of the injector supply system of under surveillance vehicles the law of density, which in turn allowed us to choose theoretical basis for ensuring reliability.
Splaynis amethod of determining the law of distribution of elements of the injector supply system from work using the functional method. This method increased the accuracy of current mathematical methods by 19-25% and reduced the time consumption by an average of 2 times to analyze the results of experimental research.
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