Advanced Materials Research Vols. 299-300

Abstract: Computer simulation method is used to study the relations of airbag effect and occupant position. By changing the position of 50% dummy model to achieve the purpose of changing the position between airbag and occupant, three kinds of simulation test are made, and the simulation results are analyzed and compared. It is shown that between the belted occupant and airbag exists such a position or distance, at which the injury to occupant is the smallest when the traffic accident happens.

Abstract: This paper studies the traffic accident prevention rules of “three points and two sections”, according to a series of dynamic environmental factors such as road conditions, traffic conditions, weather and so on, the safe distance of driving vehicles on the road sections is determined. After establishing a certain relationship between the law of “three points and two sections” and the safe distance of driving vehicles, use the relationship to indicate that the range of safe driving distance between vehicles, and propose some reasonable and appropriate measures for such problems to reduce the risk of vehicle collisions.

Abstract: This paper presents a frequency response function method to measure the natural frequency of automotive engine valve springs with respect to different spring height. A new apparatus is developed for changing the spring height within the range of valve lift. The test results indicate that the natural frequency changing highly depends on the different pitch type of the spring. The measured natural frequencies of valve spring can be direct applied to the estimation of valve spring surge characteristics.

Abstract: This paper built a road network evaluation system on the basis of the theory and methods of road network construction projects, and then established WPDEA model for it. This model was applied in Dalian city, and the results indicated that the road network matched the social-economic in some years, but it didn’t match in outher years.

Abstract: This thesis analysis the work course of the system, the match of major part, a fuzzy method for controlling the engine coolant temperature is proposed. The fuzzy rule base is correspondingly established based on the experimental data. The control query table is created through computing and analyzing via the fuzzy logic tools in MATLAB. The test indicates that only a little improvement of the current engine cooling system can better solve the problem that it is difficult to accurately control the engine coolant temperature.

Abstract: The batteries charging management system monitories and controls the batteries charging process, which can prevent battery from over charge, over voltage, over current, and extend battery life and maintenance battery performance better. This charging management system achieves through using of VC software, on the charge of the PCI-8310 module into the interface card and the PCI-8407 output interface card. In this charging system, charging balance controlling can ensure the charging balance of each battery. This batteries management system hardware circuit is simple, fast processing speed, high reliability and real-time monitoring.

Abstract: Emergency braking on a low coefficient of friction or split-mu road surface, the semi-trailer may push the tractor from behind until it spins round and faces backwards, and a jackknife accident occurs. In this paper, the tractor semi-trailer kinematics was analyzed and a 3-dof of tractor semi-trailer model was used to design a state observer to estimate the articulation angle. To avoid a jackknife, the four-channel ABS which can produce maximum braking force will be switch to three-channel ABS according the estimated articulation angle. The virtual prototyping simulation results show that the jackknife control system can improve the tractor semi-trailer lateral stability under emergency braking and shorten the stop distance dramatically on split-mu road surface at high speed.

Abstract: BP network could deal with some nonlinear problems such as fault diagnosis, but the gradient-based method tends to get stuck in local optima or premature convergence. As a population-based heuristic optimization algorithm, PSO method could increase training accuracy of BP network so as to improve discriminant precision of fault diagnosis of equipment such as engine. Ladder diminishing inertia weights tend to improve network’s convergence precision and efficiency during the late stage of PSO iterations, in addition, LPSO or RegPSO contributes to confining premature convergence. The PSO-BP fault diagnosis model of 190A diesel engine has verified the above opinions.

Abstract: This paper designs a new outlier mining algorithm based on distance through introducing the "key attribute", which reduces the amount of data mining and increases the efficiency of outlier mining, simultaneously, improves the common distance measure and calculates with the improved Modifing Weighted Manhattan Distance(MWMD), the improved mining algorithm cancels the requirements of the parameter setting in the case of without affecting the mining results and gives the isolation degree of outliers.

Abstract: Some problems existing in active standard of the shape tolerance and shape error assessment are geometrical problems which are based on the shape tolerance zone. This paper presents the probability distribution of the statistical cylinder error on the condition of the researching about cylinder error of rotor parts and does experimental measurement and data collection. It is proved that it complies with certain probability distribution law, the fitted cylinder error should gain the statistical distribution result by using mathematical statistics.