Applied Mechanics and Materials Vols. 635-637

Abstract: Conducting hydraulic piston engine design constraints on the design of the crankshaft counterweight mostly by trial calculation algorithm to calculate than the larger. In this paper, three-dimensional parametric mapping software use Dassault Systemes (SA), a subsidiary of SolidWorks under strong secondary development technology, combined with engine design now used widely in the counterweight model to explore the principles of optimal design of the crankshaft counterweight their method, derived crank weight optimized design model.

Abstract: Describes the experimental setup for studying the nozzles. Presents a methodology of the experiment and data processing of the results.Keywords: turbine, nozzle, nozzle box, small-size turbo machines, microturbines, velocity coefficient.

Abstract: In order to improve the economic benefits of tunneling to rotary drilling rig ,in this paper ,the rotary drilling rig main winch hydraulic system was improved ,by increasing an hydro pneumatic accumulator storage and releasing gravitational potential energy of kelly bar ,as well as increasing reversing motor and the main winch motor to form a hydraulic transformer .So ensured the high pressure when the energy release and reduced the rotary drilling rig engine power ,what’s more ,this system’s feasibility had been verified by theoretical calculation .

Abstract: In this paper, with the man-machine relations as the breakthrough point of the design, we study and analyze the existing large tractor’s defects and problems, based on the present situation of the large tractor on the market. Improved design for large tractor is completed, which makes large tractor model and function perfect and unified, and embodies the humanized design and requirements.

Abstract: The time and frequency forced responses for the permanent magnetic planetary gear drive were computed and analyzed. The influence of magnetization intensity and pole pair number to frequency forced responses is discussed. Results show that the dynamic displacement when only considering output excitation is larger than that when only considering input excitation,and magnetic parameters have obvious effects on the low frequency vibration amplitude of elements. When magnetization intensity and pole pair number are too large or too small, they will seriously affect the dynamic performance of the system. So, selecting rational system structure parameters is very important, which can avoid system elements generating larger vibration.

Abstract: After comprehensive considerations of the influences of stiffness excitations, deviation excitations, meshing impact excitations, friction of tooth surfaces, gap changes and other kinds of nonlinear factors, it established a nonlinear vibration model of the bending-torsion coupled spur gear driven system based on Lumped Mass Method (LMM). By transforming the model to dimensionless form and using fifth order adaptive variable step (Runge-Kutta) method to solve the nonlinear vibration model of the system, it can get the time domain charts, spectrum charts, phase charts, Poincare charts, FFT charts and the system bifurcation figures. And then it discussed the influence of system parameter vibrations on its dynamic characteristics, and this could provide a foundation for system dynamic optimization design

Abstract: A multi-objective optimization method for the optimization of the efficiency and weight of helicopter transmission planetary gear train was established. Taking the transmission ratio, efficiency weight, and reliability as critical design parameters, taking the conditions of the planetary gear train itself and the strength check constraint for the gear train as constraint functions, making the weight and efficiency of the planetary gear train asoptimization targets and using the Matlab function fgoalattain, a multi-objective optimization has been made. Comparison between the initial and the optimized results showed the success of the optimized planetary gear train in reducing the weight and increasing the efficiency.

Abstract: Main control valve is the key component of the hydraulic system, the valve value accounts for about 30% of machinery hydraulic system. The regenerative repair of main control valve was completed by adopting grinding, electroplating and other relatively simple process. So, process is easy to operation and implementation, the maintenance cost and waste of resources is decreased, and repair effect is good. The service life of main control valve regenerated by using this technology can reach or exceed the service life of new one.

Abstract: The design flow of deployable support structures is proposed based on modal analysis, and the finite element model for DST of satellite SAR is researched. On these bases, the affecting factors of DST attitude fundamental frequency (f₁) and mass, such as geometry parameters, the lock position, stiffness of hinges and thickness of truss links, are analyzed and optimized. Lastly, considering of space thermal environment the optimal design of the DST is meted the requirements under different thermal fields. The research results are of great importance to improve the performances of DST.

Abstract: A new cylindrical tea carding machine is designed based on studying the dynamic performances of the tea in machine including the analysis of tea carding machine theory and problem existing in traditional tea carding machines. The model of tea carding machine is established and the simulation analysis is studies by SOLIDWORKS. The result shows that the new cylindrical tea carding machine can improve the tightness of the tea strip more effectively and applicability than traditional machine.