Introduction of innovative technologies in friction units of heavy-duty tribosystems and monitoring of their condition

The article describes studies of heavy-duty metal-polymer tribosystems: wheel-brake pad and pyatnik-podpyatnik of rolling stock, as well as spline couplings of the MI-26 helicopter tail rotor transmission. Tests of the wheel - brake pad system were carried out on an inertial stand with two-way braking at loads and speeds close to real operating conditions. Methods for modifying polymers, fillers, and nanoscale additives have been developed for the Pyatnik - podpyatnik tribosystem of rolling stock. To increase the wear resistance of work surfaces two-layer carbon fibers were applied to the spline couplings. DLC- coatings. Bench tests of these coatings showed a 4.5-fold reduction in wear when testing full-scale slots with a load of 30,000 kg. H and the number of completed cycles in 1,000,000. Methods for monitoring spline couplings based on the analysis of the frequency spectrum of the acoustic-emission (AE) vibration signal generated during the operation of the friction unit are considered. The results of studying the working state of spline couplings obtained by vibration diagnostics in the acoustic frequency range are presented. The state estimation is based on both the characteristics of the time signal and the transformation of the signal in the frequency domain using modal decomposition of the signal using Hilbert-Huang transformations. It is shown that for the effective for monitoring heavy-duty tribosystems, it is advisable to use neural networks.

Designing and Analyzing the Brake Master Cylinder for an ATV vehicle

A braking system is a means of converting momentum into heat energy by creating friction in the wheel brakes. The braking system which works with the help of hydraulic principles is known as hydraulic braking systems. The most frequently used system operates hydraulically, by pressure applied through a liquid. These are the foot-operated brakes that the driver normally uses to slow or stop the car. Our special interest in hydraulics is related to the actions in automotive systems that result from pressure applied to a liquid. This is called hydraulic pressure. Since the liquid is not compressible, it can transmit motion. A typical braking system includes two basic parts. These are the master cylinder with the brake pedal and the wheel brake mechanism. The other parts are the connecting tubing, or brake lines, and the supporting arrangements. The present paper is about designing of Twin master cylinder system for an all-terrain vehicle and doing a feasibility study of its strength using ANSYS. Our work is focused on reducing weight which is one of the factors to increase efficiency. Reduction in weight and space, due to its compactness. The twin Master cylinder system is a great advancement in the braking system for an ATV. 3-D CAD modeling is done using SOLIDWORKS 2017, whereas the analysis of its strength is done using ANSYS.

Modification of Existing Regenerative Braking System for Electric Vehicle

Zero emissions producing and propel the vehicle wheels with own battery energy possible only by Electric vehicles. Energy conversion progression completes with little amount of heat lost only. These advantages influences internationally made the electrical vehicle as the new generation transport for the automobile engineering. Electric vehicles incorporated with regenerative braking system. However, electrical automobile on a solitary charge assortment meaningfully less than the motorized automobile. By this system, reuse energy about on fifth of the energy generally lost through put on the brakes. Lack of a serious impact on the development and popularization of electric vehicle, to overcome this hurdle by involving principle of energy regaining method in design of electric mobility operative manner. The mechanism of electric motor’s braking method encompassing converts parts of kinetic dynamisms of automobile as electric power while braking. This electric power passes to the battery for further battery charges and electric mobility mileage increases compared to conventional engines. When driving in decelerating the inertia of the vehicle wheels through the transmission of energy to pass through to the motor, to control electrical engineering with the generating electricity a way work refreshes for power battery and achieve the regeneration of braking energy. The power developed in the course of the motor braking torque remain used over transmission of the steering wheel brake, consequential in braking power. The innovative regenerative braking with kinetic energy regenerative system (KERS) saved more energy than normal regenerative braking. The life of the KERS more than the steering wheel brake system. The KERS and normal regenerative pressure is 11.94% and 4.95% respectively, Hence, KERS system more efficient than normal regenerative system

Influence of Copper/Graphite Properties on the Tribological and Electrical Behavior of Copper-Graphite Third Body Layer

The understanding of rail braking is irrevocably dependent on the tribological analysis of contacts such as the wheel/rail contact or the wheel/brake disc contact. Because it is very complex to experimentally analyze the inside of a contact, a numerical approach based on discrete element modeling was used to model a third body composed of copper and graphite, the main elements present in sintered brake materials. Simulations were analyzed by measuring several global quantities as a function of the proportion of copper and the local properties of the material to determine the extent to which local parameters influence the electrical and tribological properties of the third body. Among the results noted was the fact that a certain proportion of mixture makes it possible to achieve a balance between electrical and tribological properties.

Development of a new traction control system using ant colony optimization

An advanced traction control system can help limit wheel rotation and enhance vehicle stability. This article presents a new traction control system under complicated situations, including the low slippery road surface and split-µ road surface. First, a 15-degree-of-freedom nonlinear vehicle dynamics simulation model is established. Then, the driving wheel speed is regulated by adjusting the engine torque and the wheel brake pressure. The engine torque regulation is based on a proportional–integral–derivative plus ant colony optimization controller, and the wheel brake pressure regulation is based on a proportional–integral plus ant colony optimization controller. Finally, the proposed strategies are applied to simulation and road tests. Results indicate that the algorithm exhibits high control accuracy and robust performance. Compared with the traditional proportional–integral–derivative controller, the proposed strategies improve vehicle acceleration performance and stability.