Applied Mechanics and Materials Vols. 556-562

Abstract: In this paper, the following work is done: a new type of translational transmission device is designed; explained in detail are the operating principle, structural features, relationship of mechanism parameter and non interference conditions of the movement; the optimization analysis of transmission device is implemented on the basis of non interference conditions of the bucket movement; structural modeling and simulation analysis are carried out by utilization of Pro/e & Recurdyn; and based on virtual prototype technology, the new type of translational transmission device is verified by experiments, the data of which prove the translational transmission device reasonable and practicable. In conclusion, this paper has laid the theoretical foundation of the practical application of the translational transmission device.

Abstract: To overcome some shortcomings of the linear Acc/Dec approach and the traditional S-curve Acc/Dec method, a novel velocity planning approach is proposed for CNC machine tools in this paper. The velocity planning model based on moving average technology is structured. The presented approach is used to make velocity planning for the CNC system. Comparing with the linear Acc/Dec algorithm, the presented method greatly improves motional smoothness of the linear Acc/Dec approach and reduces the complexity of the traditional S-curve Acc/Dec algorithm, which is more suitable for high-speed and high-precision CNC machine tools. The proposed approach is tested by simulation and experimentation. Simulation and experimental results have shown that the proposed method can significantly improve the motional smoothness and consumes less resource and shortens processing time for the CNC system.

Abstract: Tire crushing equipment in crushing the whole tire processing machinery, plastic blocks larger particles using a hydraulic motor driven mechanical crushing. Tire crushing confidential solving process running overload and load startup. The main problem of large particles of plastic blocks using a motor-driven mill is overload protection and load startup. Fluctuation range of shear crushing big tires, large particles occurred requires the use of shears occur when the machine shut down and set the material inside the machine clean. The machine can be restarted. Hydraulic motor with commutation convenience and load startup characteristics. Hydraulic fluid power source as a workstation can provide power for each processing machinery and complete sets of equipment. Working pressure of hydraulic station design includes a power driven mechanical calculations, the hydraulic system. Choice and control hydraulic system, control the temperature of the hydraulic oil , mechanical work , such as the determination of the content of the component.

Abstract: In this paper, the software FLUENT was employed and the two-dimensional flow fields of external gear pump, such as flow distribution, velocity distribution, pressure distribution, turbulent kinetic energy distribution are obtained. The results show that the pressure of the pump presents the symmetry and the maximum static pressure is 0.127 MPa at the oil absorption cavity inlet. The maximum velocity appeared in the left side of the gear pump body reached 6.97m/s and the minimum velocity reached 1.09m/s on the two gears meshing line. Turbulence kinetic energy distribution of the pump shows the symmetry and the minimum turbulent kinetic energy appeared in the two gear mesh is 0.0312m²/s². Meanwhile, the maximum turbulent kinetic energy reached 12.2 m²/s² at the exit of the oil cavity. The maximum exit velocity appeared at the position of the intermediate point reached 3m/s. The results have referenced significance for design and analysis of external gear pump.

Abstract: In order to study the kinetic characteristic of a new continuously-variable-transmission (CVT), a three-dimensional model of the CVT was first established by Pro/E solid design and it was saved as Parasolid file format. Then, a kinematics simulation model of drive system of the CVT was established by importing the Parasolid file into ADAMS and the simulation was realized by replacing the traction drive of elasto-hydrodynamic lubrication (EHL) oil film with the contact constraint joints between the input and output wheel discs and the intermediate idler wheels. The simulation results demonstrate that the three-dimensional simulation model of the CVT is accurate, and the equivalent drive system of the CVT is reasonable.

Abstract: A statistics method of the high frequency working area of engine (HFWA) was proposed based on the power required of engine. The power required of engine in different typical driving cycles were statistical analyzed. The weighting function of engine efficiency interval was defined according to the power required, then the degree of engine working efficiency Dm in typical driving cycles was calculated on the assumption of weighting function and efficiency. The more suitable engine of HEV was found by taking Dm as index. Through the simulation analysis and testing, the most economic engine was chosen from the optional engines.

Abstract: A multi-body dynamic rigid-flexible coupling model of an in-wheel motor vehicle is built. This vehicle is based on a particular class-A car. An overall investigation of the influence of unsprung mass on vehicle ride comfort is conducted. With the increment of unsprung mass, overall vehicle ride comfort is decreased. The degradation of wheel dynamic load performance is most obvious. Suspension parameters are optimized based on the multi-body dynamic model of the vehicle and Response Surface Method. The suspension deflection and wheel dynamic load of the vehicle using optimized suspension parameters are improved significantly, while the body vertical acceleration increased slightly.

Abstract: This research is aimed at designing a suitable electromagnetic valve actuator (EMVA) which could efficiently improve energy saving performance of engine for scavenging two-stroke engine. Our Group simplified the GM’s EMVA and made it suitable for the engine used in experiment. CFD and mathematical modeling software were used to help our designing. According to the result of CFD, the design meets the intake requirements of the engine.

Abstract: According to the saw blade for process bogie structure characteristics,the use of Pro /E 3 d software based on the 3 d model,with ANSYS software,a static and modal analysis,obtained the stress pattern,structure deformation diagram and the former 6 order natural frequency and modal shape. The analysis results show that the node the maximum equivalent stress and the maximal displacement nodes are within the scope of the provisions,the data are meet the requirements,frame structure overall stiffness is better,frame has good static characteristic and dynamic characteristic,can meet the design requirements.And on this basis to frame was further optimized,so as to save materials,reduce cost.The theoretical basis is provided for the development of the process bogie .

Abstract: A kind of straw returning and fertilization seeder was designed. The overall structure and key technologies were introduced. The structures and parameters of the key parts were determined. The teamwork machine has a reasonable and compact structure and wide applicability, which can realize straw chopping, tillage, soil preparation, seeding, fertilization and compacting.