Advanced Materials Research Vols. 468-471

Abstract: A sort of two axes auto- tracking solar photovoltaic system based on Mitsubishi FA productions to solve the problem of low conversion efficiency in existing systems. It is discussed that how to design frames of input、control、execution 、functions and control strategies. The method of timing light intensity comparison is proposed to achieve automatic tracking of solar cells. This system can regulate automatically the horizontal angle and the vertical angle of the battery board by controlling circuits of sensors, plc, transducer and amplifier. Sound results are shown by tracking maximum conversion efficiency of this system.

Abstract: In order to improve the control capabilities of aero lengthways angle displacement system, the system’s integral control laws improvement design were done by the zeroes and poles collocation method. Based on the matlab simulation platform, a kind of improved controller was designed, and enhanced the control system’s stability precision. Simulation results show that improved control system and it’s integral control laws had gotten the more satisfying control capabilities.

Abstract: Pipe-soil interaction of steel catenary riser in touchdown zone has complex nonlinear dynamic characteristic, is difficult both in theoretical calculation and in numerical analysis. Meanwhile, pipe-soil interaction model experiment can promote the theoretical and numerical study on the issue well; experimental results can be used to guide the practical engineering design. This paper reviews the achievements of existing model experiment research, and proposes aspects which further research could focus on, then presents a pipe-soil interaction experiment program, develops test devices and achieves better test result. Therefore, these devices can play a key role in further research on the pipe-soil interaction in touchdown zone.

Abstract: In this paper, fluid field simulation was conducted with the fire water cannon, which is one of the most commonly used equipments in fire fighting. The working principle of the liquamatic fire water cannon was introduced. The internal flow performance was simulated using Fluent software; and the influence rules on jet characteristics were analyzed by changing the cross-sectional shape and diameters of the monitor body, inlet pressure and drive set of the self-swinging device. These analyses led to the optimal structural parameters of flow channel. These simulation results will provide useful theoretical guidance for design of other types of fire water cannon. The liquamatic Fire water cannon with self-swinging device was designed. The mechanism of an impeller driving four bar linkage was applied as the self-swinging device.

Abstract: The research on the pressure and velocity characteristics of the fuze inlet airflow as a second environmental force was done. The pressure difference under different airflow velocity between two pressure openings set up at fuze inlet tube throat and expansion section was obtained by CFD simulation. Through the simulation and analysis on ballistic characteristics and fluid pressure characteristics , the time characteristics of pressure difference of the pressure openings were summarized. Furthermore,the quantitative analysis result of the output signal and the feasibility of the pressure difference as an information source for fuse arming are put forward.

Abstract: By introducing the experimental purpose, instruments and the main function of the planar five-bar parallel robot dynamics, this paper concluded the principle diagram of control system of the planar five-bar parallel robot. And the method and process of the experiment was detailed description. Through the analysis of vibration acceleration curve and frequency domain curve, which were obtained by the experimental data of the planar five-bar parallel robot end-effectors, the characteristics of time and frequency domain of the planar five-bar parallel robot were clearly shown.

Abstract: Track message is obtained with a lot of adopted sensors. For one sensor, the reliability may not the same in different condition. A reliability judgment matrix for each target is constructed based on the relative reliability of information offered by sensors. Then, the reliabilities of all the sensors for each target and their general reliability can be gotten. A numerical example is presented. The well reliability sensor’s information will be chose to merge with Kalman filter algorithm in tracking handling based on data fusion technique, and gain the best estimate track. According to the demand of data fusion for the data, establish a real-time database by using the objected technology to fulfill the real-time demand of fusion algorithm. And establish a history database by Relation Database. The data in data fusion system can be managed through the two databases. In this way the data fusion system can work efficiently.

Abstract: The connecting performance of a new high speed and precision double-contact toolholder (BTF toolholder) is studied in this paper. The mechanics of elasticity and Finite Element Method (FEM) are used to analyze the effect law between the clamping force and the connecting performance, respectively. The contact stress and deformation are obtained for the tapper and surface of flange interface. The optimal clamping force is derived for the BTF toolholder under the limited rotational speed. By comparing with those of the conventional BT toolholder, the BTF toolholder has higher stiffness and outstanding connecting properties. The research results will provide the basic theory and data support for the optimization and application of toolholder.

Abstract: In this paper, the fuzzy control strategy is introduced, and then it proposes a two-dimensional fuzzy control method which takes the tractor driving wheel slip ratio and the engine throttle opening as input variables, while uses gear correction as output variable. Based on these, a fuzzy controller is designed to optimize the law of downshifting of tractor AMT. Subsequently, a best tractor AMT shift rule is formed through optimal combination of resolution obtained by the law of up-shifting. At last, simulation analysis is made on the basis of the simulation model established of tractor AMT shifting process. The results show that shift cycle can be effectively avoided and shift shock will reduced in the process of shifting, which makes the quality of shifting better and greatly improve the performance of the tractor.

Abstract: In this paper, a research work on the shape distortion of commercial-purity aluminum narrow plates in the bending process was carried out. The bending process was simulated by using ABAQUS software in order to reveal the phenomenon and law of shape distortions in deformation area. A series of bending tests were conducted for the comparison of simulation results and test measurements. By measuring the variation of width under different conditions, the factors that affect distortion level were obtained, including position of layer, punch radius, section angle of observing point and initial width of plates. Reasonable agreement was achieved between the simulation and test results.