scholarly journals Method of diagnosing a car by fuel consumption

2021 ◽  
Vol 12 (2) ◽  
pp. 45-53
Author(s):  
Yuri Gorbik ◽  
◽  
Andriy Kashkanov ◽  
Oleg Antoniuk ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Fuel Consumption ◽  
Experimental Studies ◽  
Calculated Data ◽  
Technical Condition ◽  
Operating Conditions ◽  
Energy Losses ◽  
Individual Assessment ◽  
Consumption Data ◽  
Overall Efficiency

Fuel consumption is a complex indicator that characterizes the efficiency of the vehicle, energy perfection of the car, the level of technical condition of the car, a variety of operating conditions. Changing the technical condition of components and systems of the car leads to increased energy losses, which ultimately increases fuel consumption and reduces the power of the car. If to carry out control of energy losses in each unit of the car on fuel consumption it is possible to diagnose not only the general condition of the car, but also to localize malfunction on units. The general assessment of the technical condition of the car can be performed on the basis of experimental and calculated fuel consumption data. Individual assessment of the technical condition of the units can also be assessed by private efficiency and indicator fuel consumption. The purpose of the work is to further improve the methodology and develop an algorithm for diagnosing the technical condition of the car to change the indicator fuel consumption of the car. To solve this goal, mathematical dependences and an algorithm for calculating fuel consumption and efficiency of the car on the units (indicator and mechanical engine, transmission and suspension of the car) were proposed. Also, after performing mathematical modeling of fuel consumption through efficiency, experimental studies of fuel consumption of the car VAZ-21101 were conducted. After conducting the experiment and obtaining the results, comparisons were made of the values of fuel consumption calculated by the formula M.Ya. Govorushchenko, due to the overall efficiency of the car, and the data obtained experimentally showed that the method really works and the error is about 5%. This allows us to conclude that the overall assessment of the technical condition of the car can be performed on the basis of experimental and calculated data on fuel consumption. Individual assessment of the technical condition of units can also be assessed by private efficiency and indicator fuel consumption.

scholarly journals The use of thermography in the diagnosis of ship piston internal combustion engines

2018 ◽  
Vol 182 ◽  
pp. 01027
Author(s):  
Jan Monieta
Keyword(s):  
Infrared Thermography ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Internal Combustion ◽  
Technical Condition ◽  
Operating Conditions ◽  
Combustion Engines ◽  
Destructive Testing ◽  
Fault State ◽  
Floating Objects

The intensity of infrared radiation emitted by objects depends mainly on their temperature. One of the diagnostic signals may be the temperature field. In infrared thermography, this quantity is used as an indicator of the technical condition of marine objects. The article presents an overview of the use of infrared thermography for the diagnosis mainly of marine piston floating objects and various types of reciprocating internal combustion engines as well as examples of own research results. A general introduction to infrared thermography and common procedures for temperature measurement and non-destructive testing are presented. Experimental research was carried out both in laboratory conditions and in the operating conditions of sea-going vessels. Experimental studies consisted of the presentation of photographs of the same objects made in visible light and the use of infrared thermography. The same objects were also compared, but for different cylinders of the tested internal combustion engines as well as for the up state and fault state. The characteristics of the temperature values at selected points were taken depending on the engine load along with the approximation mathematical models of these dependencies.

scholarly journals Electroresistive method for monitoring the technical condition, quality, reliability and safety the supports of rolling of electrical machines

2022 ◽  
Vol 1211 (1) ◽  
pp. 012021
Author(s):  
K V Podmasreryev ◽  
V V Markov ◽  
V V Mishin ◽  
A V Selikhov ◽  
N V Uglova
Keyword(s):  
Mathematical Modeling ◽  
Electrical Resistance ◽  
Experimental Studies ◽  
Rolling Bearing ◽  
Technical Condition ◽  
Electric Machines ◽  
The State ◽  
Electrical Machines ◽  
Technical State ◽  
Internal Environment

Abstract The necessity of monitoring the technical condition of the rolling supports of electric machines has been substantiated. It is proposed to use the electrical resistance of the bearing as an indicator of the technical condition the rolling support. The results of mathematical modeling of electrical resistance in the form of a function of resistance from factors of the internal environment of the bearing and modes of its assembly and operation in a rolling bearing are presented. An electroresistive method for monitoring the technical state the rolling support is proposed, which differs from the known methods by original algorithms for collecting information about the state of bearing parts, experimental studies have been carried out to confirm the efficiency of this method.

scholarly journals RESEARCH AND EVALUATION OF FUNCTIONAL PARAMETERS OF LOW VOLTAGE DEVICES

2018 ◽  
Vol 20 (5-6) ◽  
pp. 13-21
Author(s):  
E. Gracheva ◽  
A. Safin ◽  
R. Sadykov
Keyword(s):  
Contact Resistance ◽  
Low Voltage ◽  
Experimental Studies ◽  
Threshold Value ◽  
Probability Of Failure ◽  
Technical Condition ◽  
Operating Conditions ◽  
Switching Device ◽  
Predicting Performance ◽  
Complete Contact

To assess the operability and technical condition of low-voltage devices, it is proposed to use the resistance of contact connections. The probability of failure-free operation is proposed to be evaluated by the dependence of the resistance of the contact connections of the apparatus on the number of switching operations. As a result of wear, the initial value of the contact resistance of the switching device increases and reaches a critical value at which the switching device fails. Due to the fact that in the process of research there are both complete contact failures and short-term switching of only one time, the contact resistance is exceeded by the contact resistance of the threshold value. For magnetic starters, circuit breakers and contactors, based on the results of the experimental studies carried out, in order to achieve the critical resistance value of the apparatus, аn average of three times the initial resistance. At the same time, the quantitative characteristics of the functioning efficiency are determined by the methods of probability theory and mathematical statistics. The set of the obtained quantitative indicators allows to determine the actual level of reliability of contacting, and also extends the possibility of predicting performance ratings in the design.  In the present article, a method for the complex evaluation of the efficiency of low-voltage apparatus has been developed and the laws of the change in the resistance of contact connections and the probability of failure-free operation of low-voltage switching devices have been revealed, depending on the operating conditions.

scholarly journals Theoretical and experimental study of deep soil compaction with a cone reamer

2021 ◽  
Vol 1 (3) ◽  
pp. 60-70
Author(s):  
Kudratullo Z. Tilloev
Keyword(s):  
Mathematical Modeling ◽  
Dynamic Characteristics ◽  
Soil Compaction ◽  
System Analysis ◽  
Surface Deformation ◽  
Experimental Studies ◽  
Operating Conditions ◽  
Road Surface ◽  
Deep Soil ◽  
The Road

Introduction. The road-building machines and mechanisms are always improved depending on the tasks formed in the specific operating conditions of these machines. One of the problems of road construction in difficult climatic conditions is the lack of ground base strength, which results in road surface deformation during operation and periodic traffic restrictions, increasing the cost of maintenance. The road surface annual repair does not fundamentally solve the problem of the roads’ long-term and reliable performance. This problem can be solved by modernizing, for example, a working body for soil compaction based on a crawler excavator. Research aim is to develop a mathematical model for determining the dynamic characteristics of a cone reamer’s effective design to ensure deep compaction of soil foundations for highways and industrial and civil facilities. Research methodology is based on a system analysis of the basic tracked vehicle, the working body, and the compacted soil. The research methods also include mathematical modeling of the cone working body interaction with the soil. Results reliability is confirmed by comparing the results of numerical modeling and experimental studies. The discrepancy between the obtained results of mathematical modeling and laboratory tests in terms of torque and power does not exceed 7–10%. Conclusions. A method for determining the dynamic characteristics of cone devices is developed, and calculation formulas are derived for determining the tilting moment and torque that are applied to the shaft when compacting soils with different characteristics. Experimental studies have been conducted 70 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 3. 2021 ISSN 0536-1028 that have shown the efficiency of this working body. The developed method for determining the dynamic characteristics of cone devices is experimentally confirmed.

scholarly journals Analysis of fuel consumption of modern electronically controlled high-speed marine engines

2021 ◽  
Vol 2061 (1) ◽  
pp. 012057
Author(s):  
V V Gerasidi ◽  
A V Lisachenko
Keyword(s):  
Fuel Consumption ◽  
High Speed ◽  
Experimental Studies ◽  
Technical Condition ◽  
Cip Method ◽  
Monitoring And Control ◽  
Thermal Tests ◽  
Modern Approach ◽  
Engine Model ◽  
Marine Engines

Abstract The paper presents thermal tests of modern electronically controlled high-speed main engines of Caterpillar 3500 series of marine vessels. During the thermotechnical tests, experimental studies were carried out to change the values of the actual fuel consumption depending on the engine load. The number of engines under study installed on sea tugs during 10 years of operation was 80 units. The accumulated experience in conducting experimental studies of the technical condition control by the CIP method of diagnostics will make it possible to move from the classical approaches of technical operation to the new ones included in the system of remote monitoring and control of ship technical means of autonomous ships in operation. The experimental research methodology includes a classic approach to conducting such tests and a modern approach with remote data transmission to the shipowner’s office. Studies have shown that different types of 3500 series engines have different actual fuel consumption values, but for each series, for example, 3512B, the scatter of points is small. The results of experimental studies of Caterpillar 3500 series engines made it possible to construct generalized dependences of the actual fuel consumption for each engine model separately. Experimental studies of ship technical means by the CIP method of diagnostics of sea vessels in operation are the basis for the control system of autonomous ships.

scholarly journals PROMISING DESIGN OF A RECUPERATIVE SPRING-HYDRAULIC FIFTH WHEEL TRAILER TRUCK WITH A SEMITRAILER

2020 ◽  
Vol 8 (1) ◽  
pp. 299-305
Author(s):  
Valeriy Posmetev ◽  
Vadim Nikonov ◽  
Aleksandr Avdyuhin
Keyword(s):  
Fuel Consumption ◽  
High Reliability ◽  
Hydraulic Drive ◽  
Operating Conditions ◽  
Dynamic Loads ◽  
Energy Losses ◽  
Reduce Fuel Consumption ◽  
Metal Consumption ◽  
Loading And Unloading ◽  
Favorable Conditions

The relevance of the development and use of new promising designs of fifth wheel coupling devices for forestry tractors with semitrailers, aimed at ensuring the simplicity of the design of fifth wheel coupling devices, their high reliability, safety in work, reducing metal consumption and the possibility of accumulating and using energy that is not efficiently dissipated into the environment, is substantiated. The operating conditions of timber tractors with semitrailers for timber removal are described. The main transients occurring in the fifth wheel coupling and contributing to the emergence in it of large dynamic loads from the inertia of the mass of the semitrailer are given. A promising design of a recuperative spring-hydraulic fifth wheel trailer truck with a semitrailer is proposed, which allows to reduce the energy losses that occur in the fifth wheel trailer, to accumulate and is useful to use in the hydraulic drive of the manipulator during the loading and unloading of timber. The device and operation of the regenerative spring-hydraulic fifth wheel coupling are described. It was revealed that the use of the proposed device will improve ride smoothness and reduce fuel consumption of the forest tractor with a semitrailer, as well as provide more favorable conditions for the driver to work.

scholarly journals EXPERIMENTAL RESULTS OF FUEL CONSUMPTIONS CONSIDERING THE SPEEDS OF CITY BUSES

2021 ◽  
pp. 72-80
Author(s):  
S.V. Ilyanov ◽  
◽  
N.A. Kuzmin ◽  
G.V. Borisov ◽  
◽  
...  
Keyword(s):  
Mathematical Models ◽  
Fuel Consumption ◽  
Analytical Method ◽  
High Speed ◽  
Experimental Studies ◽  
Road Transport ◽  
Operating Conditions ◽  
Motor Vehicles ◽  
Actual Distribution

At the moment, there is a large number of dissertations and scientific works covering the issues of traction-speed and fuel-economic characteristics of vehicles, the results of which are presented in the form of: regression models, approximating dependencies, mathematical models based on multivariate analysis, including a number of additional coefficients. In this connection, the use of the results of these works in practice is limited, since it requires high qualifications of the МTЕ personnel and the use of special software and hardware. At the same time, at the department “Automobile transport” NSTU named after R. E. Alekseev developed a probabilistic-analytical method for predicting fuel consumption by road trains, considering the high-speed mode of movement, which shows a high convergence of results with actual average speeds only for uniform movement of buses with a constant average speed, which is not applicable to the assessment of fuel consumption of city buses. Based on the hypothesis put forward on the applicability of the Weibull-Gnedenko distribution for calculating the average speeds of city buses and the normal distribution for calculating accelerations during movement, the tasks of this study are formulated, expressed in the development of mathematical models reflecting the dependences of speeds and accelerations during bus movement in urban operating conditions, for planning their fuel consumption. To solve the set tasks, the following experimental studies were carried out: determination of the average coefficient of total road resistance; the actual distribution of speeds and accelerations when driving city buses; determination of the average actual value of fuel consumption when the bus is moving and when idle at stopping points. Based on the results of processing experimental studies, the possibility of using the Weibull-Gnedenko law to describe the actual speeds in urban conditions and the normal law to describe accelerations when driving city buses was confirmed, which allows planning fuel consumption using the analytical apparatus of the theory of probability and mathematical statistics and using the developed methodology in practice of motor transport enterprises. Based on experimental studies and theoretical studies in this area, an analytical method for planning fuel consumption for city buses, considering the speed of their movement, has been developed, which allows planning fuel consumption without additional experiments. Carrying out such studies for other types of motor vehicles and assessing unaccounted for indicators of road, transport and natural-climatic operating conditions will create a generalized analytical method for planning fuel consumption by vehicles in various operating conditions.

scholarly journals THE METHOD OF EXPERT ASSESSMENT OF THE TECHNICAL CONDITION OF AN AUTOMOBILE ENGINE AFTER OVERHEATING

2021 ◽  
pp. 5-16
Author(s):  
Alexander Khrulev ◽  
Olexii Saraiev
Keyword(s):  
Cylinder Head ◽  
Computational Models ◽  
Thermal State ◽  
Objective Assessment ◽  
Experimental Studies ◽  
Calculated Data ◽  
Technical Condition ◽  
Expert Assessment ◽  
Technical Ability ◽  
Loss Of Coolant

Problem. For expert studies of the technical condition of a car, a difficult task is to determine the causes and development of malfunction of engine mechanisms and systems. The paper proposes a model of engine malfunction during overheating, including in emergency mode caused by rapid loss of coolant. It has been established that thermal damage to the cylinder head is possible within 10 seconds after the cooling failure. The piston heats up more slowly and can only be damaged in the upper part and for a much longer time. According to the results of the study, it was found that in the event of an emergency loss of coolant, the driver does not have the technical ability to see the temperature rise, which may be important when investigating the causes of engine malfunctions associated with overheating. Goal. The goal is to investigate and reproduce the model of engine failure after overheating. Methodology. The theoretical calculated data are confirmed by real experimental studies of engine overheating failures. Results. It was calculated by calculation that in the absence of coolant, the temperature sensor, if it is located on the outlet pipe of the cylinder head, will not increase the temperature until the engine fails. A certain definite character of malfunction of parts of engine mechanisms during its sudden overheating is shown. Originality. On the basis of the developed models, a methodology was drawn up and the calculation of the thermal state of engine parts after overheating was performed. Practical value. The research carried out and the computational models compiled allow the expert to make a more objective assessment of the development of the engine malfunction mechanism when it overheats during the operation of the car.

DIESEL ENGINE OPERATION IN USE OF FUEL WITH ADDITIVES

2018 ◽  
pp. 18-24
Author(s):  
Petar Kazakov ◽  
Atanas Iliev ◽  
Emil Marinov
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Combustion Engines ◽  
Engine Operation ◽  
Factors Affecting ◽  
Operating Modes ◽  
Positive Effects

Over the decades, more attention has been paid to emissions from the means of transport and the use of different fuels and combustion fuels for the operation of internal combustion engines than on fuel consumption. This, in turn, enables research into products that are said to reduce fuel consumption. The report summarizes four studies of fuel-related innovation products. The studies covered by this report are conducted with diesel fuel and usually contain diesel fuel and three additives for it. Manufacturers of additives are based on already existing studies showing a 10-30% reduction in fuel consumption. Comparative experimental studies related to the use of commercially available diesel fuel with and without the use of additives have been performed in laboratory conditions. The studies were carried out on a stationary diesel engine СМД-17КН equipped with brake КИ1368В. Repeated results were recorded, but they did not confirm the significant positive effect of additives on specific fuel consumption. In some cases, the factors affecting errors in this type of research on the effectiveness of fuel additives for commercial purposes are considered. The reasons for the positive effects of such use of additives in certain engine operating modes are also clarified.

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