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TABLE 11.
The table of the designed values of border of change of structural parameter: l (.) 488412015619222826430033637240844448051 6552F B9.912.41416.318.921.824.82821.535.539. 542.9F H9.510.812.31415.817.820222527.330.3333 6.63943 On the basis of the received results curves of the top and bottom borders of change of the structural parameter, certain(determined) by results of diagnosing are under construction. Rice 8. Diagrams of curves of the top and bottom borders of change of structural parameter Item 5.2.3. Resource on top (R) and bottom (R) to borders of realizations is estimated: R = [(F2- - (F2-0 - t?? F2-0))/? In] 1/?, {34} R = [(F2- - (F2-0 + t?? F2-0))/? ] 1/?, {35} RB = 473,4; RH = 550,57 There are borders of residual resource : R = R - tg1; {36} R = R - tg1. {37} R = 473.4 - 418 =55,4; R = 550.57-418=132,57 RH - R = 132.57-55.4=77,17 Results of calculations R from a position of decision making about periodicity and volume of repair influences are analyzed, proceeding from the following conditions: R - L == > 55.4? 13 condition is not carried out. ? R > L; 55,4 > 13 ? - repair of the engine is planned at run R; ? R - R < L 77.17 < 13 - the condition is not carried out ? R > L; 55,4 > 13 ? - repeated diagnosing is planned at run tg2 = R - L ? R - R > L. 77.17 > 13 Means repeated diagnosing will be carried out(spent) at run equal: tg2 = 55.4 - 13 = 42,4 (.)
6. Conclusions.
On the basis of comparison the estimations of parameters of an average resource executed on the correlation equations of durability and on the basis of processing of the statistical data, the conclusion about a degree of their consistency and necessity of training of models is made, in process of accumulation of experimental data. Realization of structural parameter concerning area of his(its) change for set of the same engines is considered. Factors which have defined(determined) a resource of a detail, and actions which should be lead(carried out) to the motor transportation enterprise maintaining considered(examined) automobiles, for increase of reliability of the engine are allocated. 7. The list of the literature: 1. Engines of internal combustion. The textbook for HIGH SCHOOLS. Under edition .. M.: the higher School, 1985; 2. The brief automobile directory. . M.: Transport, 1971.; 3. Methodical instructions(indications) to course work. .: , 1989.; 4. Ivanov With. . A rate of lectures on discipline technical operation . .: , 1998.. The Ministry of Education of the Russian Federation The -Ural State University Faculty: "Motor transport" COURSE WORK On discipline: Consumer properties On a theme: Operational properties of the automobile .
The summary. D.I.operational of property .-Chelyabinsk: , -2301, 2003,30 with., 11 fig. the Bibliography of the literature of names 4. In the given course work the traction calculation of the automobile including definition of full weight of the automobile and selection of trunks, definition of the external high-speed characteristic of the engine, definition of transfer number of the main transfer and a box of transfers was made. On the basis of the received data it is determined n??-speed characteristics of the automobile. In last turn we consider parameters of fuel profitability and dynamic qualities at braking the automobile. According to calculation diagrams of dependence are under construction. All received results are compared to parameters of the prototype of similar transport. The MAINTENANCE(CONTENTS).
The basic designations
Introduction
Choice and substantiation of the initial data
1 Traction calculation of the automobile
1.1 Definition of full weight of the automobile and selection of trunks
1.2 Definition of the external high-speed characteristic
The engine
1.3 Definition of transfer number of the main transfer
1.4 Definition of transfer numbers of a box of transfers
2 Definition of n??-speed qualities of the automobile
2.1 The traction diagram of movement of the automobile
2.2 A dynamic characteristic of the automobile
2.3 The dynamic passport of the automobile
2.4 the diagram of movement of the automobile
2.5 Acceleration at dispersal
2.6 Definition of time of dispersal of the automobile
2.7 Definition of a way of dispersal of the automobile
3 Parameter of fuel profitability of the automobile
4 Definition of dynamic qualities of the automobile
At braking
The conclusion
The literature
The basic designations
The F-frontal area of the automobile, m;
Go-weight of the automobile in the equipped condition, ;
Ga-full weight of the automobile, ;
G-weight of the trailer, ;
G2-weight of the automobile, falling a back axis, ;
Jm-moment of inertia of rotating details of the engine, 2;
Jk-moment of inertia of wheels, 2;
Uo-transfer number of the main transfer;
Uk-transfer number of a box of transfers;
rk-Radius wheels, m;
V-Speed of movement of the automobile, /;
Vmax-The maximal speed of movement of the automobile on the maximum(supreme) transfer, /;
ne-Frequency of rotation of a cranked shaft of the engine, 1/;
nN-Frequency of rotation of a cranked shaft of the engine at the maximal capacity, 1/;
nmax-The maximal frequency of rotation of a cranked shaft ????????n1/with;
j-Acceleration of the automobile, m / ?2;
The j-as much as possible delay of the automobile at braking, m / ?2;
g-Acceleration of free falling, m / ?2;
Pm-traction force on driving wheels of the automobile, ;
P? Force of coupling of a driving wheel of the automobile with road, ;
P? Force to resistance , ;
P? Force of resistance to rise, ;
Pw-force of resistance to air, ;
P? Force of resistance of road, ;
Pj-force of inertia of the automobile, ;
Me-turning moment of the engine, ; Ne-effective power of the engine, kw; The Nm-traction capacity brought to driving wheels, kw; N? Capacity of resistance of road, kw; Nw-capacity of resistance to air, kw; The Nj-capacity spent for dispersal of the automobile, kw; The D-dynamic factor of the automobile on conditions of draft; D? The dynamic factor of the automobile on conditions of coupling; ge-The specific effective charge of fuel, kg / ???; qn-The travelling charge of fuel, /; S-way of movement of the automobile, m; S-way of braking of the automobile, with; t-Time of movement of the automobile, with; t-Time of braking of the automobile, with; ? Factor of resistance ; K-factor the automobile; ? P-factor of the account of rotating weights of the automobile at dispersal; ? Efficiency of transmission; ? Factor of resistance of road.
Introduction.
Designing is a complex - the works necessary for creation new or modernization of the let out automobile. The decision on creation and use in a national economy of the concrete automobile is based on the document containing the nomenclature of automobiles is most full satisfying needs(requirements) of a national economy with their basic technical and economic characteristics, a perspective type. The perspective type of automobiles grows out the analysis of three basic directions spent by branch is skilled - design development of perspective samples, experimental and research works. In a perspective type key parameters of the automobile are given: carrying capacity or , the basic mass parameters, the wheel formula and an arrangement of driving wheels, the maximal speed and parameters , normative run before major overhaul, normative labour input of service and operating repair, capacity and working volume of the engine. At the subsequent design stages these data are specified for concrete models and supplemented with other parameters, which number y from a stage to a stage. On the basis of the authorized perspective type the enterprise the developer creates the technical project which forms the basis for development of outline and technical projects. The technical project is developed in view of a scope of new model on the basis of the analysis of the generalized materials by results of tests and operation of previous models, the general(common) development of engineering, safety requirements of movement of need(requirement) of the market inside the country and opportunities of export, legislative instructions, a production potentialities of manufacturer and his(its) accessory manufacturers. The technical project establishes the basic purpose(assignment) of a condition of operation characteristics, parameters of the quality, the special requirements showed to the developed automobile. During development of the contract design finally define(determine) parameters allowing to judge configuration of the automobile and the constructive decision of his(its) separate units and units. For a final choice of settlement parameters of the engine and transmission develop mathematical model of the automobile which allows to take into account influence of these parameters both on n??-speed, and on ????-economic properties of the projected automobile in various road, climatic and loading conditions. As criteria of an estimation thus such technical and economic parameters as productivity the given expenses for transportation, the cost price of transportations are usually used. As the prototype we accept Ural - 377. A cabin - three local, all-metal. Carrying capacity 750 000 ; own weight 149500 . Choice and substantiation of the initial data. At calculation of course work the following data were used: 1) The given initial data:
