Applied Mechanics and Materials Vols. 496-500

Abstract: Two models of hydraulic turbine based on pump in reversal were simulated. Pressure distribution of flow field in Variable conditions was analysed and external characteristic was forecasted for hydraulic turbine. It was shown: the head increased with flow increased, with increasing of flow rate, efficiency first increased and then decreased. Compared with the turbine with a guide vane, the head of two models was almost equal, but the disparity of efficiency was large, and the efficiency of hydraulic turbine with a guide vane above on the efficiency of hydraulic turbine without guide vane. Pressure pulsation was existent in runner inlet. From runner inlet to runner outlet, the pressure distributed evenly from high to low. Added with a guide vane, the pressure distribution was more evenly than before and the Amplitude of pressure fluctuation decreased.

Abstract: This paper mainly introduces three types of hydraulic energy-dissipation dampers, which adopts the damping hole, relief valve, and relief throttle valve, and the structures, operation principles and energy dissipation mechanisms in detail. Using AMESim to analyze the performance parameters comparatively, it can be concluded that the hydraulic damper adopting relief valve has strong capability of energy consumption and effectively ensures the safety of engineering structures.

Abstract: In order to effectively reduce the crop stubble harvesters digging resistance, enhance stubbles picking rate and intact stubble rate, the Research Group took structure improvement for the Crop stubble harvester and its critical component based on abundant trials. Three physical machines in succession were developed, and a trial contrastive analysis between the optimized harvester and the first harvester was conducted. It turned out that the improved harvester machine was clearly superior to the first machine.

Abstract: The real salt cores from drill-site was regarded as the prototype in this experiment. They are used to simulate solution mining process of salt caverns. In this paper the mathematical model of solution mining wasset up.Experimental parameters are obtained by similarity ratio. Afternumerous experiments on the artificial salt rock model,the results show that thecontrol experimental parametersand the references design are effective.This researchhas some guidance on field engineering of solution mining construction.

Abstract: Radial damping hydraulic bushing is the object of this study, which is widely used as vibration isolator in the vehicle chassis system. The lumped parameter (LP) model for hydro-bushing is usually applied to the dynamic characteristic analyses. Two-way fluid-structure interaction FEA (nonlinear finite element analysis) technique is used to identify the main parameters of the LP model. The method proposed in this paper can ensure high quality and low cost in hydraulic bushing development.

Abstract: How to reduce or eliminate the noise of the vane steering pump is a key problem to use hydraulic power steering car to solve. After a lot of experiments and demonstration, the methods of adopting correct transition curve, and a large circular arc method, adopting low noise impact curve of eight times optimization design, and the advanced stator curve fitting method, are to be good solutions to the problem of the vane steering pump noise.

Abstract: this article do research in explosive broken problem, using the triple differential of the explosive roll type crushing technology to realize safe automation, take man-machine isolation operation measures, effectively reduce the labor intensity of workers, improve working environment ，ensure the personal safety and broken after medicine block size and crushing efficiency, it have high safety and reliability, certain promotion value, laid a solid foundation of technical innovation for the military and civil industry.

Abstract: In order to study the gas-solid flow characteristics in a rotational spouted-fluidized bed dryer, the eulerian multi-phase model was applied in three-dimensional numerical simulation of a rotational spouted-fluidized bed to analyze the effect of different velocity ratios between bottom and tangential wind on gas and particle velocity distribution characteristics, and the change rule of gas-solid flow state with the time at the velocity ratio of 30 m·s^-1/30 m·s^-1 was derived. The results show that the increase of tangential wind velocity is propitious to enhance the gas flow rate in the region near the wall and make the gas-solid phase mix sufficiently as well as augment of the contact area of gas and particle phase, and decrease of the gas flow dead zones and the adhesion of viscous materials to cylinder wall. However, the negative pressure formed by the entrainment effect of tangential wind goes against the development of gas flow along the axial direction reducing the penetration effect of axial wind to the granular layer.

Abstract: Fiber ring resonator is widely used to generate stimulated Brillouin scattering(SBS). In this paper, the operation principle of SBS in a single mode fiber ring is analyzed, and the simulation method is proposed.

Abstract: The airborne vehicle would suffer from impact at landing, the impact load is one of the most important indexes for the security of vehicle. There was a little statistical test data of landing impact load, but it was not enough for researching on the relationship between landing condition and impact load. This paper describes the application of new technology for the prediction of landing impact under stochastic conditions. Based on the Finite Element method, Response Surface Model and Monte Carlo method, the statistical method for landing impact load under stochastic landing conditions was proposed. The results would provide the boundary conditions for the design of vehicle and provide the evaluative terms for landing security.