Papers by Keyword: Reliability

Abstract: The concept and operation rules of the blind number based on Unascertained Theory are introduced. This case study demonstrates the advantage of unascertained theory described in reliability optimization, and a stress-strength reliability optimization design model is built up at same time. In addition, the corresponding practical optimization calculating program is given. Test on the validity and practicability of this model is also verified by comparing the result of reliability gained from this model with that obtained from the traditional reliability-design method.

Abstract: For the fatigue failure mode of turbine of turbocharger for vehicle application, the method for fatigue reliability analysis and fatigue life prediction of turbine is studied based on the endurance test profile of engine. Firstly, the critical location of turbocharger turbine with fatigue failure mode is determined. Then, the fatigue stress process of turbine is calculated according to the main operating modes consisted of the endurance test profile of engine. The fatigue strength of critical location of turbine with fatigue failure mode is studied through the fatigue test of imitation specimen, and the relationship between the fatigue life of turbine and stress is developed. Further, according to the endurance test profile of engine, the reliability model of turbine with fatigue failure mode is developed, and the rule that the reliability of turbine with fatigue failure mode changes as the cycle number of endurance test of engine is studied. Finally, the method for determining the reliable fatigue life of turbine is proposed.

Abstract: Using UG to build a shell of the three-dimensional solid model, using the finite element software on the solid floor is analyzed, the shells fall into 8 drop, respectively, to various forms of stress and strain were compared, and the shells of the reliability analysis.

Abstract: Today, transmission systems are playing important roles in engineering. For all of the components in them, status of the rolling bearing has been rising. In modern times, people are making great efforts on the optimization of transmission system. At the same time, optimization design of all the internal components was also important. For all the techniques, research to the rolling bearings has become increasingly mature. In this paper, the rolling bearing in growth of box of the 2 MW wind generator was took as the research object. The load coefficient of rolling bearing was been calculated, then the reliability assessment model of the rolling bearing was been made. On the basis of which, the optimization design on the reliability was done.

Abstract: To study the communication problem between the intelligent sensor and the host computer or the remote teminal and design a converter.The converter is based on the microprocessor ATMEGA644.Data received from the input interface circuit and repackaged according to massage frame format of the output bus and sent to the destination. Verified the reliability of the converter by means of the experiment of digital temperature sensor DS1621 which output is I2C.The converter is able to meet most applications.

Abstract: In order to explore the unexploded ordnance problem of cluster munitions and find the solutions,M85 Sub-munitions reliability models were established,and the models were simulated by applying the Monte Carlo method.The causes of failure and influencing factors of the dual-purpose improved conventional munitions M85 have been analyzed according to experimental data, so these results show reliability models are right.

Abstract: To establish the model of wireless sensor network reliability, the sensor nodes’ reliability was assumed to be exponential distribution. By the methods of MLE and K-S , reliability distribution function of sensor nodes was verified in line with two parameters Weibull distribution . Basing on experimental dates , reliability distribution function of sensor nodes accorded with two parameters Weibull distribution and exponential distribution were in Eq.9 and Eq.10. Comparative results in Fig.5 shows that the two parameters Weibull distribution exceeds the exponential distribution to describe the distribution of sensor nodes.

Abstract: The paper describes the development of a technique for the optimal design of water supply and distribution systems, based on a coupling between evolutionary algorithms and a pressurized hydraulic network solver. The purpose is to show the capabilities of Pareto genetic algorithms (PGAs) in solving multi-objective, constrained optimization problems: in such cases, the optimum is represented not only by one solution, as in single-objective optimization, but by a set of optimal configurations (the Pareto front or frontier), satisfying different levels of compromise among the competing objectives. A Pareto GA should determine the family of such non-dominated solutions, each of which is optimal in the sense that no improvement can be achieved in one criterion without the degradation in at least one of the remaining criteria. This might be of great help to the decision maker in selecting the best trade-off configuration, which will eventually depend on the actual context. An application to a real case is also presented.

Abstract: In the state that the chimney is being used, we evaluate the seismic performance of the reinforced concrete chimney on the basis of testing the tilt, mechanical properties and chemical composition, configuration of the steel and construction measures, the lining damage, the cylinder damage, the subsidiary systems and dynamic characteristics of the chimney. The results show that: For the long-term wind action, corrosion and hot action, and lower level of construction and lower design standards, the reliability of the chimney structure can’t meet the current standards requirements, and need to take appropriate measures to be reinforced; but the seismic performance of the chimney structure can meet current standards requirements.

Abstract: In the situation that unit failure probability is imprecise when calculation the failure probability of system, classical probability method is not applicable, and the analysis result of interval method is coarse. To calculate the reliability of series and parallel systems in above situation, D-S evidence theory was used to represent the unit failure probability. Multi-sources information was fused, and belief and plausibility function were used to calculate the reliability of series and parallel systems by evidential reasoning. By this mean, lower and upper bounds of probability distribution of system failure probability were obtained. Simulation result shows that the proposed method is preferable to deal with the imprecise probability in reliability calculation, and can get additional information when compare with interval analysis method.