International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

In the paper, fuzzy logic is used to simulate active suspension control of a one-half-car model. Velocity and acceleration of the front and rear wheels and undercarriage velocity above the wheels are taken as input data of the fuzzy logic controller. Active forces improving vehicle driving, ride comfort and handling properties are considered to be the controller outputs. The controller design is proposed to minimize chassis and wheels deflection (sky-hook concept) when uneven road surfaces, pavement points, etc. are acting on tires of the running car. As a result, a comparison of an active suspension fuzzy control and a spring/damper passive suspension is shown using MATLAB simulations.

The subject of the paper, titled ‘Multistage Gear Project Of The Electrical Car SGR2016 for the Silesian Greenpower organization’, is an analysis of a chain vibrations in drive gear of SGR 2016 bolide. The exact moment of gear switch presents the greatest threat of a stability loss. Tests have been conducted in 2 stages. The first stage was the determining of derailleur setting. The adjusted component was a mechanism responsible for increasing the drag movement of derailleur cage. Adjustment of this element caused change in vibration characteristics in different system parts. That element was adjusted so oscillations were minimized. The second stage of studies was pinpointing the correct rotational speed, at which gears should be changed, using previously defined derailleur adjustment. Speed, at which the gear switch takes place, was chosen so the vibrations are lowest possible. Oscillation amplitude was recorded using high speed camera, and the data was analyzed using a dedicated High Speed AVI software. Speed measurement had been done using magnetic field sensor. All studies have been conducted on inertial system, simulating real life race conditions. Comparing all results, optimal driving parameters in terms of drive gear work stability, have been defined.

This paper deals with the comparison of Control of quarter car vehicle suspension using Linear Quadratic Regulator (LQR) and Fuzzy Logic Controller (FLC) which are considered to control quarter car suspension and computer simulation is done on the nonlinear quarter-car model with actuator dynamics. The Linear Quadratic Regulator (LQR) and Linear Quadratic Gausian (LQG) methods are the most used control approaches. LQR and FLC provide the possibility to emphasize quantifiable issues of vehicle suspensions like; ride comfort and road holding for varying external conditions.

This paper describes the results of numerical simulations and laboratory experiments of quarter car semi-active suspension model. Elastic characteristic of the coil spring and damping characteristics of the shock absorber in various operating modes are determinate. The amplitude-frequency characteristics and transfer function of the system with various damping coefficient are obtained. The results can be used to design semi-active suspension control strategy for improving ride comfort and road holding of ground vehicles.

In recent years, many researches in the field of electromobile transport using as driverless vehicle are carried out in Russia as in the world. Operation electromobile transport in Russia has specific features, among which are the cold climate and heavy traffic conditions. One of the key elements of the functioning of electromobile transport is an energy storage system, the characteristics of which are highly dependent on how and under what conditions the vehicle is operated. The life of the energy storage system is also adversely affected by high temperature and short overvoltage on its elements. To increase the mileage of vehicles on the electric energy storage provides an improved system design, and in this article the experience of creating such an energy storage system for the driverless vehicle, taking into account including the Russian operating conditions. In the process of creating energy storage system were carried out calculations, mathematical and natural layout the basic elements of the system.

In this work a method of vehicle-pedestrian accident reconstruction in case of unlimited driver visibility and accelerating vehicle moving is presented. This method presents are mathematical models for determining the pedestrian visibility time, vehicle speed at the moment of impact, time to vehicle move from the moment of the hazard occurrence until the moment of impact, the vehicle distance from the place of impact, stopping distance, etc.

The article describes software modules of computer-aided design of vehicle power supply systems: analysis of modes of power supply systems operation, optimal choice of wire sizes, selection and verification of protective devices.

Possibilities of diagnosing of a technical condition of brake system of the car with ABS while in service are considered. The concept of sharing of onboard means and stands for diagnosing is presented.

The main issues are considered in this topic: creation of optimization algorithms electrical systems; development of specialized software; creating an effective method aided design of electrical systems of vehicles.

The structural weight reduction is the most visible effect of composite application, but it’s primarily important for aircraft or spacecraft only. In engineering branches the major effect of fiber reinforcement plastics (FRP) application is the ability to solve some fundamental technical challenge, for example: simplifying design of construction, the overall dimensions reducing of the elastic element, non-fragile, etc. In this paper the methodological approach to FRP application considered. Some examples of engineering design for vehicle load-bearing FRP element are presented.