Papers by Keyword: Braking

Abstract: The paper aims to present some studies on the influence of mechanical braking systems with shoes on separately excited DC motors, intended to change the regime speeds. The researches were carried out by braking a 5 W DC motor with a maximum speed of 700 rpm, intended for special drives, with the help of a polyamide half-shoe brake, when measuring the variation of some process parameters: speed of the motor under the braking conditions, the temperature inside the shoe and the electrical parameters of the motor - voltage, current, power and energy consumed.

Abstract: The paper investigates the effects of mechanical wheel slide protection devices (WSPD) on the braking capacity for coaches equipped with disc or cast iron block brakes. Decelerations and jerks, that affect the passengers comfort, are also analyzed. An original simulation program, based on experimentally determined air pressure evolutions in brake cylinder is used for this purpose. Results of numerical simulations show that in the case of repeated actuations of mechanical WSPDs, disc brake vehicles are more affected in terms of braking capacity. Regarding jerks during braking actions, in both normal and low adhesion conditions, vehicles equipped with high power cast iron block brake with two pressure levels prove to be more affected.

Abstract: This paper presents the structure design and the performance testing method of a novel type of gas braking control system. Based on PDSOFT 3D design method double gas detection instrument control system has been carefully designed, effectively using the space of the case body. Using a direct acting overflow pressure reducing control technology, effectively through gas level decompression pressure were quickly and accurately is reduced to 0.7Mpa and 0.45Mpa, according to the tightness test results show, the tester can keep the pressure stability of the error is less than 0.1%. With quick joints of interlocking sealing design technology based on, settle the problem of connecting and sealing between the traction chassis brake system pneumatic hose and gas path instrument brake control pipeline, detection of gas pipeline. In the design of DC regulated power supply, the innovation to the DC voltage stabilizing circuit modular design, can effectively avoid the input voltage fluctuation on the influence of the load end, to ensure the stable operation of the independent power supply module tester. The tester can be easily used to test their performance general traction air braking system chassis in the stationary state, and can be directly used digital display reading way test data will be output directly, save the test time, improve the test efficiency.

Abstract: An algorithm about tractor-semitrailer longitudinal load and lateral load transfer amount was proposed in order to research the driving stability of tractor-semitrailer steering and braking. A dynamic simulation model of tractor-semitrailer including load transfer was established by using S-Function. The results show that the model including load transfer is more actual than conventional model to describe the driving stability of vehicle Further analyzed the effect of factors on load transfer when tractor-semitrailer steering and braking.

Abstract: A 18-DOF tractor-semitrailer nonlinear dynamics model was developed to describe the travelling characteristics of tractor-semitrailer braking in the cornering, considering the related nonlinear factors on the vehicle such as load transfer, saddle and tire. On this basis, it was calibrated that vehicle simulation model is reliable through real vehicle test. It was further analyzed the effects on lateral stability such as saddle position, load, braking force distribution and inside/outside wheel braking force difference through simulation when tractor-semitrailer braking in a turn.

Abstract: Based on actual load conditions, the transient temperature field and thermal stress field of rail wheel under the conditions of service braking, emergency braking and ramp braking are calculated by means of the finite element theory. As a result, the inner side of web hole is in a prolonged condition of tensile stress, while the outside of web hole is in the condition of compressive stress, where the value of tensile stress is maximal under ramp braking. Furthermore, the value of thermal stress for worn 20mm wheel is obviously higher than that for non-worn wheel.

Abstract: Control methods of the anti-lock braking system have been researched. A BP based Fuzzy-PID controller is proposed to reduce the time and the distance during braking. Through the compare of PID controller and fuzzy-PID controller and the BP based Fuzzy-PID controller which were simulated on Matlab/Simulink, it shows that BP based Fuzzy-PID controller has shorter braking distance and less braking time. So ABS with BP based Fuzzy-PID controller will work better than traditional PID controller.

Abstract: In the process of unmanned aerial vehicle (uav) landing safely and quickly brake problem，Puts forward a uav electric eddy current braking method.The method through the eddy current and magnetic field interact to produce braking torque. According to the uav braking requirements, Design the uav electric eddy current brake simulation system. Test results show that: Based on the eddy current brake technology the average braking torque for 870N·m is greater than the “inner” type uav brake the average braking torque for 530N·m, Can meet the requirements of the uav braking system, So will the eddy current brake applied to unmanned aerial vehicle is feasible.

Abstract: In order to improve efficiency of Electro-Hydraulic regenerative braking system on electric bus, this paper will analysis dynamic performance and typical driving condition of electric bus based on ADAMS to establish electric bus simulation model and AMEsim to built hydraulic regenerative braking system simulation model. After simulation, displacement of Pump, volume and working pressure of accumulator, ratio of driving coupler will be optimized. The acceleration performance of electric bus will be enhanced obviously after applying hydraulic regenerative braking system.

Abstract: Based on Dynamics of Flexible Multi-body theories, the flexible multi-body model of tower crane is established, by using the module of ADAMS/FLEX. The vibration characteristics of tower crane is analysed during the case of braking slewing motion by introducing the modal neutral file of tower crane flexible jib and mast. Advices are given in this paper for the dynamic analysis and the control design of tower crane.