Advanced Materials Research Vols. 834-836

Abstract: This paper carried out the modal analysis for ram based on ANSYS, and calculated the first six natural frequencies and vibration modes and finally verified that the dynamic incentive caused by the spindle rotation on the ram does not produce resonance phenomenon generally. By adding harmonic load, made the harmonic response analysis based on the modal analysis, calculated displacement and stress responses of the system under the action of the exciting force and obtained the dynamics and the frequency response curve, that is, amplitude-frequency curve which verified the ram can withstand various sine loads of different frequency. The dynamic characteristics were studied and the dynamic parameters were obtained after the studies above, which provide important foundation for the design and improvement of the machine ram structure.

Abstract: Wave glider harvests the abundant ocean wave energy for long term ocean cruising due to its particular two-part architecture. Its submerged part named glider converts vertical fluctuation of waves to horizontally forward propulsion. Because of the uncertainty of the ocean condition and irregularity of its wave motion, the design parameters of the submerged glider vary in a confined range in the state of art design models. In order to indicate the hydrodynamic characteristics and summarize the dynamic law of the submerged glider with different design parameters, this paper concentrates on three critical design details: profile of the wings, interval space of the arrayed multiple flapping wings and maximum rotating angle of wings, and performs the corresponding CFD analysis. Finally, we conclude that the lift curve of NACA0006 and plate profile is almost the same with small waves at sea, but NACA0006 profile can generate much larger forward lift than the plate profile with seawater velocity up to 0.5m/s; Decreasing space of intermittent causes more obvious decrement of forward lift while space of intermittent overpasses the inflection point at 20cm; With the decrement of the maximum rotating angle, the forward lift occurs to take a sharp decline if the angle strides the inflection point.

Abstract: In this paper, wheel loaders, for example, the use of Solidworks software loader attachment parts and other parts of the three-dimensional solid modeling, parametric generation components and for assembly; the finite element analysis of the working device, and check the strength.

Abstract: The working performance of transplanting mechanism in transplanter directly affects the working quality and efficiency, it is the core component of a rice transplanter. In this paper, the mainly form and current development of high-speed transplanting mechanism are introduced, and different kinds of transplanting mechanism ́s characteristics, structure principle and applicability are summarized. Meanwhile, the kinematics and dynamics analysis of all kinds of transplanting mechanism are also stated. Finally, putting forward proposals for the research trend of transplanting mechanism and problems that still need to be solved. On this account, it would provide some ideas to perfect the study of transplanting mechanism and research new machine.

Abstract: In this paper, the FLUENT finite element software is used to simulation analyze the rotary kiln, kiln gas combustion process and gas-solid coupling effect. The kiln and rotary kiln of gas temperature field is calculated and then imported into the ANSYS software as an initial condition to complete the reconstruction of the temperature field and using the node interpolation method to carry out thermal stress analysis. Through the joint simulation analysis based on FLUENT and ANSYS finite element software, the analysis of rotary kiln combustion process, the heat transfer and the mechanical response of the structure can be implemented under the same condition, making the simulation results of rotary kiln more related to practical operation conditions. The method and results presented have significant theoretical guidance for the research and development of new types of rotary kiln.

Abstract: The static character of piezoelectric composite actuator with four tubes is studied. Taking into account the non-uniform electric field distribution in piezoelectric tube, the bending deflection, axial strain, output axial force and bending moment are discussed. The results calculated by proposed method are compared to that calculated by traditional thin wall theory and the proposed method is more accurate and reasonable. A prototype actuator was fabricated and tested to validate the theory results. The theoretic result and tested results agree well with each other. This research provides theoretical guidance and basis for the design of piezoelectric tubular composites actuators.

Abstract: In this paper, the hydrodynamic properties of expendable bathy thermograph (XBT) is analyzed and got the changes of lift coefficient and drag coefficient with the attack angles change. We research the pressure field profile outside of XBT with different attack angles and analyze the reasons which can affect the stability of XBT. The research can provide reference for further optimization of the probe structure and stability test of XBT.

Abstract: The interference mode has a significant bad influence on the performance of the VCG, in order to reduce the interference, the interference modes frequency should be far away from the working frequency of the VCG. In this article, the FEM software ANASYS is used to analyze the vibration mode of the resonator with a PCB base and a steel base, the frequency response of these two kinds resonators are measured, finally, the performance of the gyroscopes are tested. From the testing results we can find, by changing the resonators base from PCB to steel, the interference mode is eliminated, and the zero-bias instability of the gyroscope is improved from 3.37°/h to 0.73°/h.

Abstract: Ashing is a photoresist-stripping process using oxygen or hydrogen radicals and is one of key process step in the semiconductor manufacturing processes. Uniform and fast stripping is the key factor in ashing. In this study, a computational fluid dynamics simulation was applied to find conditions for uniform molecular flux over the wafer surface and to optimize the ashing chamber geometry. In particular, the distance between the gas inlet baffle and wafer stage in the 450 mm wafer chamber was determined through inductive inference statistics. To improve the reliability of this simulation, the correlations between the calculated molecular flux distribution and the measured ashing rate distribution over 300 mm wafers were sought first. Effects of the distance between the baffle and wafer stage, wafer stage temperature, and gas flow rate on distributions of molecule flux and velocity, temperature and gas molecule density were calculated. The simulation showed that the density distribution over 450 mm wafer surface was more uniform when the distance between gas inlet baffle and wafer stage was between 35 mm and 60 mm, and that the reactant flux distribution was more uniform when the distance was between 60 mm and 80 mm. Therefore, the distance between the gas inlet baffle and wafer stage was chosen to be 60 mm.

Abstract: The paper studies the mixing effects of anchor stirring on crystallization hybrid process. The single phase flow field of three dimensional in crystallizer of 5 L is simulated by the software of Star CCM+. The change of flow field is analyzed under different stirring speed in ammonium chloride solution. The simulation research shows that the speed of fluid in the area around impeller is high, but in the surrounding and bottom area of stirring shaft is low after forming a relatively stable flow field in the crystallizer. As the stirring speed enhancement, the speed of fluid in the surrounding area of impeller and velocity gradient increase too. However, the flow of fluid in the area of axial direction is not sufficient.