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Research of lateral force of pipe conveyor belt’s vertical transport section

100%

Wang S. , Guo Y.-C. , Li D. Y. , Hu K.

tom Vol. 37, iss. 1

67--75

In order to release the lateral force of pipe conveyor belt in vertical transportation, the thesis had a study of the lateral force of the conveyor belt. By making use of Janssen Principles and fractal theory, based on reasonable simplification, the author established a mathematical model of the lateral force in vertical transportation, and with the research foundation of the pipe belt conveyor for underground transportation, through solution analysis, the author found out that the change of material diameter would lead to nonlinear variation of the lateral force of the conveyor belt. Under the circumstances of different material diameter, discrete element method was adopted to simulate the lateral force of the conveyor belt, thus working out the distribution curve chart of the lateral force. To verify the reliability of the theory, the author built an experimental platform for pipe conveyor belt in vertical transportation, and experimented with five groups of materials in different diameter, working out the strain of lateral force of the characteristic conveyor belt; by comparing the theoretical result, the simulation result and the experimental result, it showed that the solution to relieving lateral force through optimization selection of material diameter put forward in this thesis was reasonable and effective. It provides theoretical reference for the design of pipe belt conveyor.

Investigation of dynamic properties of vehicle in various friction condition simulated with use of skidcar system

80%

Žuraulis V. , Kemzūraitė K. , Więckowski D.

Archiwum Motoryzacji

2014

tom Vol. 63, nr 1

89--99, 195--205

In this paper, the friction characteristics of a vehicle equipped with skidcar system are analyzed. Skidcar system with attached additional wheels helps to regulate the adhesion with the road surface. Easy slipping vehicle is a useful device for driving skills improvement, carrying out various vehicle dynamics and control research activities. Important reason of skidcar systems is an ability to set low friction values in dry and good contact road conditions. Regulation of friction characteristics extends the limits of the system operation. In this case, the identification of friction characteristics is important. Vertical load of wheels and critical horizontal forces are measured in each operating mode by changing skidcar system height. Furthermore, IS04138 driving manoeuvre is performed to measure the vehicle accelerations, oscillations and slip parameters for friction evaluation in dynamic state. The performed analysis could be useful for drivers training and for further vehicle stability and control researches upon using skidcar system.