Applied Mechanics and Materials Vols. 448-453

Abstract: Rotating automatic steerable drilling technology is a new automated drilling technology developed in the early 1990s, which is an important aspect of the development of drilling technology in today's world. The basic structure of closed-loop rotary drilling tools is designed and basic structure of hydraulic thrust control system which greatly saves the time for hydraulic oil flowing back into the tank is innovatively designed based on Auto Trak RCLS (Baker Hughes). The structure of closed-loop rotary steering drilling tools, hydraulic thrust control system principle diagram, basic structure of hydraulic thrust control system and basic structure of flow pressure differential control valve and basic structure of oil filter assembly are rendered by AutoCAD drawing software.

Abstract: This paper traverses failure phenomenon about the piston rod of rapping device. Through the ANSYS/ls-dyna software, the finite element analysis was carried out on the piston rod ,force of the impact on the piston rod was taken as the form of triangular pulse load, whose time was lasting 0.05s, and it can get the maximum load in 0.025s. Maximum stress occured at the fillet of the piston rod are obtained. Based on nonlinear finite element method for transient dynamic analysis of the piston rod , analysis results are consistent with the actual conditions, and demonstrates the feasibility of finite element analysis.

Abstract: Starting with the degree of freedom, constraints, instantaneous center and other basic knowledge points, the size of transmission ratio and direction of a single-row planetary gear mechanism were qualitatively analyzed and calculated by using the method of speed triangle, and a new approach to the kinematic analysis on planetary gear mechanisms is provided after eight kinds of single-row planetary gear transmission schemes have been summed up.

Abstract: This paper discussed some properties of ovoid gear. The gear is a kind of special gear that transformed from the non-circular gear, hence just like the non-circular gear it also has some unique properties itself. In the paper we did some research start from the transmission of non-circular gear and point out the variable working pressure angle property. Then toke the ovoid gear as an example to deduce the working pressure angle expression, and discusse the force between two separate tooth during the meshing process. After all those things has been done, a 3D model of ovoid gear was established under the help of Pro/E, and then imported it to the Adams to do some meshing simulation in order to find the contact force under the impact of variable working pressure angle.

Abstract: In order to solve the problems of rapid rolling schedule optimization design, a combined method of experience and theory were presented in this paper for rapid regulation design . This study adopted the methods of mathematics link for excel as interface development plug-in interface , excel as a model parameter setting and mathematics as the underlying model calculation and optimization software. The new rolling parameters optimization design is obtain , using the experience of rolling method and the variable rolling force model. The design method of calculation results are accurate, rapid rolling parameters setting, model the characteristics of the freedom of choice

Abstract: A three-dimensional steady-state numerical model of oil-gas separator with inlet-collision structure used in small-sized Variable Refrigerant Flow (VRF) system was established. RNG k-ε model was used in gas field and DRW model was chosen for oil droplets tracking. The influence of inlet-collision on velocity distribution, separation efficiency and pressure loss were studied. The results showed that the inlet-collision structure which had smaller radio of inner pipe length to cyclone bodys height could achieve the same separation efficiency as the no inlet-collision structure with bigger cyclone diameter. Higher separation performance could be obtained when the inlet-collision proportion was less than 26.57% and inlet velocity was about 24 m·s^-1.

Abstract: Based on one-way fluid-solid coupling, a variable pitch axial fan was simulated through ANSYSY Workbench platform. With the software Fluent to describe the flow field and the software Mechanical to describe the structure field, the static structure analysis of the blades was carried out to study the strength of the blades. The flow field data were applied on the blades by interpolation. The results show that the centrifugal force plays an important role on the strength characteristics of the blades. Considering the aerodynamic load, the distribution of stress of the blades tends to be more uneven, the maximum equivalent stress reduces by 4.5% and the maximum deformation decreases by 26.6%. With the increase of flow, the maximum equivalent stress and the maximum total deformation of the blades decrease gradually.

Abstract: Room air conditioner is widely used in a single room or other enclosed spaces to increase the comfort of the environment. It adjusts the temperature and humidity to maintain the comfort for humans; dehumidification is a very important function of room air conditioner. This paper demonstrated the relationship among dehumidification capacity, entering air parameters, and evaporative temperature, presented the calculation method of maximum condensate water flow rate in certain condition, discussed the interaction of energy efficiency ratio and dehumidification capacity, and gave the relationship of condensate water flow rate and evaporative temperature using a specific compressor model. It is suggested that a balance should be made between dehumidification capacity and energy efficiency ratio for room air conditioner operating requirement.

Abstract: This paper is based on the wavelet transform theory and the Hilbert transform, it aims at researching on the pressure fluctuation characteristics in the bed, through analyzing and comparing the calculated envelope spectrum of pressure signal after transforms. On the basis of self-built cold fluidized bed, we choose to change the air flow and diameter of particle in fluidized bed as the two influencing factors. For researching the pressure fluctuation characteristics of fluidized bed, we collect pressure signal of the large particle fluidized bed which under normal operation conditions. The experimental results reveal that: as the increasing of the air flow, the energy of pressure increases; and with the increase of particle size in fluidized bed, the pressure fluctuation decreases in the bed.

Abstract: At the different elevation of the spouted bed riser pipe layout pressure measuring point, each point below is equipped with purge air, avoid the granular poly group on the pressure measuring point, by adjusting the frequency of the bandpass filter, guarantee the accuracy of pressure measurement. Through experimental study, under the low superficial air velocity, riser pipe pressure pulsation standard deviation has a linear relationship with the superficial air velocity and obey the chi-square distribution, based on the above found , rising pipe pressure pulsation standard deviation forecast the incidence of granular poly group is proposed in this paper. By comparing rising pipe pressure pulsation standard deviation forecast method with conventional average pressure drop forecast method found, rising pipe pressure pulsation standard deviation has higher superficial air velocity recognition rate and less response time when the granular poly group,achieves the spouted bed fast forecast the granular poly group phenomenon.