Advanced Materials Research Vol. 1037

Abstract: Combining the principle of practical car and some of the pole machine in life, using the flat quadrilateral mechanism and institutions, the ratchet wheel and pawl springs structure, sprocket, chain transmission, I cleverly put forward a kind of car that can attach to the surface of the rod , climb vertically and be controlled remotely. On the structure, the unique spring clamping compensation mechanism realize the variable diameter bar crawling easily. Clever lever principle to institutions of successful implementation of its own gravity can be converted to climb bar pressure, which can overcome the climb machine is limited by its own gravity.

Abstract: In order to observe the kinematic characteristic and dynamic characteristic of working state of hydraulic excavator, and aim at the complexity and time consuming of the numerical calculation and field test, the hydraulic excavator working device motion simulation and analysis scheme is put forward. By kinematics simulation, the envelope trajectory of the manipulator and the basic working parameters are got; by dynamics simulation, the force of each hinge in symmetrical and offset loadings is got, and the most hazardous working condition and hinge are determined. Thus provided the basis for strength analysis and design optimization of hydraulic excavator working device. Accordingly, a simulation analysis method to study the dynamics of the working device in hydraulic excavator is provided.

Abstract: The soil compactor is one of the most important construction machineries which play an significant role during our economic development. And the complicated nonlinear characteristic of equipment-material system is an interesting field in recent theoretical and applied investigations. According to experimental datum, a nonlinear model derived from piecewise linear was used to describe the hysteretic behavior of soil material during compaction. Through choosing proper model parameters, the nonlinear dynamic characteristics are commendably controlled which could represent different compacting stages. Furthermore, the series phase diagram and Poincare section were obtained by simulation. The hysteretic characteristics might be incarnating from periodic vibration to chaotic vibration. Further research proved that reducing the angular frequency of rotation may bring the chaotic vibration coming back to periodic vibration, which provided a good assistance for further study on hysteretic character of soil compaction and man-machine engineering on vibratory compacting system.

Abstract: The problem of the urban water shortage and water pollution is becoming problem more and more serious. Therefore, governments around the world pay close attention to the application of sewage treatment technology, especially that with high efficiency, low energy consumption and strong operability. Dielectric barrier discharge (DBD) can produce low temperature plasma under atmospheric pressure, and the application of the technology for sewage treatment research gradually becomes to be one of hot research. In this paper, the dielectric barrier discharge structure is designed, and the plasma produced is used for sewage treatment research. The system adopts coaxial type discharge structure. The research shows that the structure is safe and reliable. And, it has low discharge power and can discharge uniformly. So, the plasma produced by dielectric barrier discharge can be convenient and easy to used in sewage treatment, and the result is effective.

Abstract: In order to improve the dynamic performance of a piloted flight simulator hexapod, a study was carried out to quantify the effects of payload mass and inertia properties on hexapod dynamic performance. Based on the Lagrange-Euler formulation, a dynamics model of hexapod parallel mechanism including the payload mass characteristics was built, and then analyzed with the real hexapod through experiments. According to a large amount of experiment datum, the influence of payload mass and inertia properties on a piloted flight simulator hexapod dynamic performance was obtained, and these results are significant for the high speed and high acceleration control of the hexapod mechanism.

Abstract: Based on the MASTA cylindrical gear manufacturing module, the hobbing process and heat treatment of automotive transmission gear were simulated. The simulation results show that the hobbing process has a lot of excellent process characteristics, such as good adaptability, continuous cutting, no extra stroke, higher productivity. By the MASTA software simulation the maximum value of the gear heat treatment deformation is about 70 um. The trend of thermal deformation first increases, then decreases, and then increases.

Abstract: In order to help researchers better understand the dynamic characteristic of independent wheelset rail vehicles, this article presents a new modeling way to establish an independent wheelset bogie with a white-box dynamic analysis tool-MapleSim. In this article, an independent wheelset model is made firstly. Than based on this wheelset model, an independent wheelset bogie is made. After the modeling, the necessary validation with Simpack is done. The straight line dynamic validation includes the creepage of left and right wheels, the lateral displacements of bogie and both wheelsets’ yaw and lateral displacements. The results are similar to the model with the same parameters in Simpack which reveals that the bogie model in this article is correct and feasible.

Abstract: In the past, the safety factor selected was too high, and the material was serious wasted in the design process of lifting equipment. In order to solve this problem, this paper analyzed the stress of the large capacity skip. Through analysis,we had the relationship with the strength of the skip and section cross-sectional area, the thickness of the skip bucket box plate, the stiffener of cross-sectional area, the spacing of stiffeners, and knew the primary and secondary relationship.

Abstract: The paper establishes the objective functional model of sheet metal forming in drawing process with ANN, a mapping between sheet forming parameters and performance evaluation indexes was built, which provides important preferences for researching and optimizing these parameters. It obtains neural network model of high precision through the training of cross experiment method. At last a model was built. According to the test results, the error of the network were less than 5%.That means the network is available, and also it establishes foundation of the process parameters optimization.

Abstract: Two-parameter Weibull-Distributing estimation method is presented to assess the life and the reliability of the axle box spring in the Electric Multiple Units (EMU) bogie. It provides a practical method for quantitative assessment of the reliability. This method can be verified by the operation of the new EMU running in the future. Meanwhile, as it is based on the actual operation data, the conclusion of the assessment is very valuable to the EMU safety.