scholarly journals SOME PARTICULAR ASPECTS OF THE AUTOMOTIVE INDUSTRY CONNECTORS

2021 ◽  
Vol XXVIII (4) ◽  
pp. 44-51
Author(s):  
Titu-Marius I. Băjenescu ◽  
Keyword(s):  
Automotive Industry ◽  
Electronic System ◽  
Operating Conditions ◽  
Fretting Corrosion ◽  
Corrosion Prevention ◽  
Design Technology ◽  
Performance Factors ◽  
Actual Meaning ◽  
Contact Unit ◽  
Electrical Connectors

Electrical connectors are very sensitive parts in an electronic system. The actual meaning of reliability and the problems associated with determining it, are often not right understood. The paper presents some particular aspects of the automotive industry connectors’ i.e. fretting, fretting corrosion prevention, aluminium connections. The performance factors governed by the operating conditions and design-technology factors determined by the manufacturing characteristics of a contact unit were analyzed.

PNEUMATIC VIBROISOLATION SYSTEM OF THE BASE DESK WITH NATURAL FREQUENCY REGULATION

2021 ◽  
Vol 113 ◽  
pp. 91-100
Author(s):  
Radka JÍROVÁ ◽  
Lubomír PEŠÍK
Keyword(s):  
Natural Frequency ◽  
Automotive Industry ◽  
Natural Frequencies ◽  
Dynamical Behaviour ◽  
Operating Conditions ◽  
Frequency Regulation ◽  
The Stability ◽  
Short Time

Vibroisolation systems of base desks for machine and testing facilities usually cannot effect efficient changing of their own frequencies according to operating conditions. Especially in the case of the automotive industry, the possibility of changing natural frequencies is very desirable. During varying operating conditions, the vibroisolation system needs to be regulated easily and quickly regarding the minimisation of dynamical forces transmitted to the ground and to ensure the stability of the testing process. This paper describes one of the options of tuning the base desk at a relatively short time and by sufficient change of own frequencies, which decides the dynamical behaviour of the whole system.

Assessment of a Strategy for Optimum Control of Ignition Advance Angle

1988 ◽  
Vol 202 (1) ◽  
pp. 1-8 ◽  
Author(s):  
R S Quayle ◽  
S R Bhot
Keyword(s):  
Combustion Engine ◽  
Electronic System ◽  
Open Loop ◽  
Operating Conditions ◽  
Ignition Timing ◽  
System A ◽  
Engine Design ◽  
Peak Cylinder Pressure ◽  
Crank Angle ◽  
Inlet Manifold

The control of ignition timing in an internal combustion engine can improve fuel consumption. Electronic control implemented in software with a microprocessor has advantages over conventional mechanical systems. An open-loop electronic system, while incorporating an optimum profile against inlet manifold vacuum and speed, cannot readily adjust for wear. The optimum crank angle at which the peak cylinder pressure occurs has been found to be reasonably constant for a particular engine design irrespective of operating conditions. This paper presents a discussion of the use of this parameter as a measurand for a closed-loop ignition timing system. A discussion is presented of the control strategy used and results demonstrate the ability of the strategy to maintain constant the peak pressure position.

Power Connector Behavior Used in Automotive Applications

2013 ◽  
Vol 325-326 ◽  
pp. 556-561
Author(s):  
Rochdi El Abdi ◽  
Erwann Carvou ◽  
Noureddine Benjemâa ◽  
El Mostafa Zindine
Keyword(s):  
Electric Power ◽  
Automotive Industry ◽  
Electronic System ◽  
Heat Evolution ◽  
Main Function ◽  
Insertion Force ◽  
Resistance Evolution ◽  
Finite Element Software ◽  
Vibration Tests ◽  
High Level

The increase in the number of electronic and electric systems used in the automotive industry necessitates a high level of electric power. To respond to this high electric power demand, it will be necessary to increase the voltage of the batteries and the current and to use new power connectors. A connector provides a separable interface between two subsystems of an electronic system. The main function of the connector is to transmit a signal or distribute power. For power connectors, heating can lead to an increase in contact resistance and sometimes even to contact surface melting and thus to connector damage. In this study, vibration tests and heat evolution of a commercial power connector used in the automotive industry was undertaken. The connector includes two spring lamellas on each side and the pin is flat. The pin is introduced between the two lamella springs and is submitted to vibration tests. Using an experimental set-up, the mechanical insertion force, the temperature and the resistance evolution can be measured. To quantify these parameters at the contact zone, a numerical modeling, using the finite element software Ansys, is used to give the change of the insertion force during several insertion-extraction cycles and to solve the differential equations for heat transfer in a transitory mode.

scholarly journals The effect of different types of ageing on adhesive properties of steel cord. Salt aging

2019 ◽  
pp. 99-101
Author(s):  
O. N. Khrol
Keyword(s):  
Automotive Industry ◽  
Accelerated Aging ◽  
Operating Conditions ◽  
Dynamic Loads ◽  
Adhesive Properties ◽  
Metal Cord ◽  
The World ◽  
Different Types ◽  
Steel Cord ◽  
High Dynamic

The development of the world automotive industry is aimed at creating new, both in design and properties of tires that can operate in high dynamic loads under different operating conditions. The most probable cause of aging of automobile tires is considered in the article; one of methods of laboratory tests for the accelerated aging of system rubber-metal cord is described. The dependence of the influence of the metal cord design on the adhesion characteristics of the rubberized metal cord and its resistance to aging is also analyzed.

scholarly journals CONSIDERATIONS REGARDING THE RELIABILITY ASSESSMENT OF THE ROLLER BEARING PROVIDING MOVEMENT IN THE DIRECTION OF ANTI-AIRCRAFT GUNS

2021 ◽  
Vol 19 (1) ◽  
pp. 47-52
Author(s):  
Doru LUCULESCU ◽  
Keyword(s):  
Roller Bearing ◽  
Reliability Assessment ◽  
Rolling Bearing ◽  
Operating Conditions ◽  
Design Technology

This paper analyzes a method of evaluating the reliability of the rolling bearing in anti-aircraft guns. In evaluating its reliability, the factors that depend on the operating conditions of the anti-aircraft gun are taken into account, as well as the factors of design, technology, materials and assembly

Fretting Corrosion Analysis on Packings of Hypercompressors

2009 ◽  
Author(s):  
Jun-Xia Shi ◽  
Enzo Giacomelli
Keyword(s):  
High Pressures ◽  
Great Influence ◽  
Operating Conditions ◽  
Fretting Corrosion ◽  
Economic Operation ◽  
High Fatigue ◽  
Poly Ethylene ◽  
Critical Machines ◽  
Local Defects ◽  
Sealing Elements

Secondary compressors for Low Density Poly-Ethylene are very critical machines. Safety aspects and reliability expectations determine a thorough evaluation of the service and the parameters involved. The solution used for the machine requires a long experience of positive results in these applications. Cylinder performance is strongly influenced by the design and also related to the combination of operation and maintenance activities. The capability to withstand the high fatigue stresses and the need to avoid any leakage of gas around the compressor area involves due considerations and design solutions to minimize such occurrences also during abnormal operations and emergencies. In addition to the cylinder valves, packings represent important components with great influence on the availability of machine and plant. The operating conditions of the packing, due to the high pressures involved, and the geometry of the components, create the condition for a relative movement of the cups mating surfaces. In general at disassembly, when maintenance and reconditioning activities are carried out wear, pitting, corrosion and local defects can be detected on the cups and sealing elements, as a function of the life of the cylinders. The condition of the cups may also evidence some damages, with evident deposit of polymers, oil and wear of the components. Fretting corrosion phenomena may be sometime the reason of failure of packing in hyper-compressors for LDPE production. In some cases the repeated occurrence of various abnormalities on the packing life and particular wear pattern on the cups bring to need to discover the reason of the problems and require an accurate investigation, by using advanced laboratory analyses. The results evidence that the origin of such phenomena can be found on the surfaces of the components and on the organic acids, as in such conditions they are able to originate and develop the corrosion reactions. There is a strong connection with process parameters and operating conditions. These situations and particular applications have to be evaluated to put in place adequate actions to improve or have more chances of a reliable and economic operation.

scholarly journals Optimización de la resistencia del cuero automotriz en operaciones de ensamble empleando un diseño experimental 3k

2019 ◽  
pp. 5-13
Author(s):  
Edgar Augusto Ruelas-Santoyo ◽  
Juan Antonio Sánchez-Márquez ◽  
Antonio Sánchez-Luna ◽  
Maria del Carmen Chacón-Olivares
Keyword(s):  
Automotive Industry ◽  
Quality Standards ◽  
Operating Conditions ◽  
Automotive Sector ◽  
Factorial Experimental Design ◽  
Mechanical Tension ◽  
Optimal Operating ◽  
Two Factors ◽  
Animal Skin ◽  
A Company

Within the automotive industry one of the most used materials for user comfort is animal skin, this material is used to coat pieces that will have contact with the consumer. One of the most important problems that arise with the handling of the skin in operations of coating and assembly within plants of the automotive sector is the lack of resistance. A treatment that must be applied to the skin to improve its conditions of resistance to mechanical tension, is in function of two factors: percentage of moisture in the skin and amount of surfactant applied. In the present investigation, optimal operating conditions are established for the handling of the skin used in processes of the automotive sector based on a 3k factorial experimental design. The application case was carried out in a company dedicated to manufacture armrests for high-end cars. The results of the investigation show an improvement of 97% in operations where the resistance of the skin is required to meet the quality standards established in the automotive industry.

scholarly journals Design and Implementation of Highly Integrated Electronic System for Small-Size Spacecraft

2021 ◽  
Author(s):  
Xinfeng Yan ◽  
Wei Liu ◽  
Gaosi Li ◽  
Jian Geng
Keyword(s):  
Power Distribution ◽  
Electromagnetic Compatibility ◽  
Lightweight Design ◽  
Electronic System ◽  
Installation Space ◽  
Good Effect ◽  
Design Technology ◽  
Orbit Control ◽  
Differential Positioning ◽  
Space Requirements

Due to the tight installation space, strict weight requirements, numerous functional units and dense wireless equipments of small-size spacecraft, the traditional electronic system design of aircraft cannot meet the requirements of miniaturization and lightweight for small-size spacecraft. In this paper, a highly integrated electronic system suitable for small-size spacecraft is designed, in which many key technologies such as miniaturization and lightweight design technology, multi frequency wireless electromagnetic compatibility design technology, small aircraft low delay cooperative networking and high-precision differential positioning are adopted. The proposed highly integrated electronic system makes timing control, attitude and orbit control, wireless telemetry, networking communication, satellite navigation, power distribution and other functions integrated. The total weight of the system is about 7.62kg, which is much lighter than existing electronic system. The experiment results that the highly integrated electronic system achieves good effect. This technology has broad application prospects in small-size aircraft with strict weight and space requirements.

scholarly journals Development of e-automated control system friction clutch of the vehicle

2021 ◽  
pp. 6-19
Author(s):  
Oleksandr Dziubenko ◽  
Mykola Mykhalevych
Keyword(s):  
Control System ◽  
Automotive Industry ◽  
Dynamic Properties ◽  
Tracking System ◽  
Electronic System ◽  
Residual Pressure ◽  
Automated Control ◽  
Military Vehicles ◽  
Friction Clutch ◽  
Combat Vehicle

Problem. One of the most pressing problems of modern automotive industry is to simplify and facilitate driving. As for such a branch of the automotive industry as military equipment. One of the keys to successful completion of the task by the crew of any combat vehicle is the least possible distraction from the process of driving a vehicle and focus on the task. This is possible if the vehicle is provided with relatively comfortable driving conditions, good dynamic properties and the required minimum of controls. The solution to the issue of facilitating car driving cannot be solved without automation of transmission control. Goal. The aim of the project is to create a prototype of an electronic system of automated control of the friction clutch of a vehicle to increase the reliability and efficiency of special and military vehicles. Methodology. Analytical methods of research, program and full-scale modeling, experimental researches on real object of management are used. Originality. New interrelations between the structural elements of the actuator of the friction clutch are proposed, which allow to ensure the required speed of the actuator of the electropneumatic clutch control drive without losing control accuracy when using two electropneumatic valves. The proposed control algorithm of the actuator allows the use of both normally closed valves without residual pressure in the power cylinder. Practical value. The stages of synthesis of the electronic control system are carried out. The algorithm of operation of the tracking system with the use of PID-regulator and taking into account the features of the actuator is proposed and debugged. A new clutch pedal design with an induction sensor is proposed, which provides high accuracy and speed, and also requires only two wires to connect.

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