Advanced Materials Research Vols. 383-390

Abstract: In order to satisfy the needs of Mars precision landing, a Mars entry navigation method is proposed for the problem of Mars atmospheric density model uncertainty. The navigation system processes accelerometer outputs as measurements, employs an extended Kalman filter bank regulated by the generalized multiple-model adaptive estimation method. Simulation results demonstrate the navigation system can identify the real atmospheric density model automatically, and show adaptivity and robustness to the uncertainty of atmospheric density. The navigation performance is greatly improved compared with traditional dead-reckoning

Abstract: The fuel-film evaporation model and transient fuel-film compensator model were established. By virtue of Simulink, the validity of above models were verified. The square wave perturbation method was introduced. Basing numerous calibration, the fuel-film compensation strategy including zoned compensation and damping factors ware proposed. This new strategy can compensate in-cylinder fuel fluctuation effectively during transient conditions.

Abstract: 3201Z-type dump truck is modification desiged by EQ3208GJ dump truck chassis which the technical performance parameters are known, and using a lifting mechanism of air controlled hydraulic system. By analyzing the composition and working principle of air controlled hydraulic system and referring to similar models, the design of the tank, the limiting mechanism and power taker are conducted. By calculating the main technical parameters, including in the performances of the hydraulic cylinder and the hydraulic pump, the dump truck's special oil cylinder HG-E180X780 and gear pump CBT-E563 are selected. By the stability of the piston rod, the system pressure and cars lifting time are checked; the reasonability and safty of the design can be proved.

Abstract: Magnetorheological (MR) Fluid is an intellectual material with comprehensive prospect. In recent years, it is widely attended in the scientific-research field. Flow rate computational model of the MR throttle valve is derived by using Binham fluid model. The mathematical model of electromagnetic induction intensity for the MR throttle valve is established. The designed magnetorheological throttle valve is simple, compact and has some creativity. Proposed use of magnetorheological hydraulic components presents a problem.

Abstract: Aiming to solve the problems of inaccuracy in temperature control and the slow reaction in condensing system in the automated distillation analyzer, an approach which combining electrical fan and thermoelectric cooler was put forward, using STM32 as the control unit; accurate temperature control during the distillation process was realized, data collection and processing can be completed by the control unit, and the wireless module can accomplish communication and control the analyzer under the instructions of computer. With this temperature control method, the automation and test accuracy of distillation analyzer can be enhanced, thus ensuring better ratio of performance-to-price and control performance.

Abstract: According to the phenomena of regular grooves on the face of seal gasket which causes the hundreds of gaskets irrational failure in the valves of pressure-swing absorption (PSA) for CO refinement in a cathay coal chemical CO.LTD, the method of computational fluid dynamics (CFD) has been used to analyze the fluid dynamical performances of the mixed gas flowing in the pipe system of the PSA to study the reasons of the irrational failure of the seal gasket. Conclusions have been obtained as following: the main reason of Teflon seal local inactivation is the irrational seal system structure which causes the local high-velocity over the face; a rational modified scheme has been offered; the method which can be used to analyze similar problem has been explored in this paper.

Abstract: Considering the various factors which influenced the safety of hoist system, and the general objective which was the failure probability of hoist system, it established the safety risk assessment model for hoist system. Then it used the time-varying effect to forecast the failure probability and crash damage of hoist system. It constructed the evaluation index system, and used the AHP method, the fuzzy mathematics method and the method of expert advice on weight distribution at various levels. Based on the evaluation and analysis of Zhuzhuang reservoir projects on the gate crane, it proved that the safety risk assessment model for hoist system was scientific, safety and reliability.

Abstract: Ship loader is one of the most key equipments for bulk material handing in bulk port. This paper regards the ship loader as the study object, introduces an auto detection technology of cabin position and material distribution, and advances a new control measure for automation loading. The field-bus technology of Profibus, AC800M series PLC, inverter, encoder was adopted to build automatic control system. In the mean time, the control code and the ship loader Management System, which is written in Control Builder for AC800M and Visual Basic independently, are used to actual ship loading process without people.

Abstract: Rotor position detection is important for motor servo system design. In general, there are two kinds of methods to obtain the position information in real time, sensor or sensorless methods. The sensor methods use position sensors such as optical encoder. This will greatly increase the cost of the system, and the sensor with high precision is difficult to be installed. On the other hand, the sensorless method can reduce the cost, but the reliability and complexity of the algorithm is still the problems. In this paper, a new low-cost integrated position detection unit, which is composed of the integrated position sensor, signal processing hardware and software, is described. The sensor is easy to manufacture and has better precision with the help of signal processing circuit and software based on DSP. The sensor can obtain absolute rotating angle using inductance detection method, and it is originally designed and used for a 2-phase hybrid stepping motor position servo system. Even though the feedback unit is originally designed for a 2-phase hybrid stepping motor, the same unit also can be used with other types of motors.

Abstract: In this paper, we show how a MAT (Mesh-of-Appendixed-Trees) embedded into the crossed cube which is a variant of hypercube. When we seek to implement this MAT-based mapping scheme on a crossed cube machine, we solve the two following questions: an N×N MAT can be embedded into a crossed cube of 4N² nodes and the smallest size crossed cube to embody an N×N MAT has 4N² nodes.