Advanced Materials Research Vols. 562-564

Abstract: The hybrid driven special five bar mechanism is applied to cutting mechanism for the novel ellipse section shield machine. Based on the rod-group method, inverse kinematics of the special five-bar mechanism are analyzed and mathematics models of inverse kinematics are set up in order to obtain the equations and relations of position, velocity and acceleration between output motions and input motions. Some characteristic curves ofθP andθ4 are obtained through inverse kinematics analysis and the computer emulation, meanwhile the results of simulation proves the accuracy of the ideas in this paper. It lays an academic foundation for further research.

Abstract: The butt weld of Q345R with the thickness of 40mm has been manufactured with the submerged-arc welding (SAW). The mechanical properties of the weld seam have been tested and the metallurgical structures have been analyzed. Conclusions have been obtained as follows: the metallurgical structure of multi-layer butt weld is much more complicated than the monolayer ones; only the last weld layer has the obvious zones of weld zone, heat-affected zone (HAZ) and fusion area; the weld zone and the fusion area will be heat treated with the next layers weld finished; the mechanical property of the multi-layer butt weld is much better than the monolayer weld determined by the corresponding organization.

Abstract: The truck-mounted solar collector testing system is a flexible and convenient testing device. However design of thus a system is much more difficult than that of the fixed solar collector testing system, because it needs consideration in every respect so as to make sure the following: accurate testing, accommodation of the reduced volume of the testing system, stability of the testing system, addition of a removable device and so on. This article explores the systematic design of the truck-mounted solar collector testing system, points out the design issues to be considered, propose an appropriate design plan, and finally conducts the main force calculation. Solar energy is one of the cleanest sources; it is green and pollution-free. Today, environmental pollution is getting worse and worse; thus application of solar energy is becoming more extensive. A solar collector is defined as any of various devices that absorb the solar radiation and deliver the heat energy to the medium of heat transfer device. Solar collectors are not a direct consumer-oriented product, but key components that form various solar thermal systems, such as solar water heaters, solar energy dryers, solar industrial heaters and so on, of which the solar collectors are a core part of the system. At present solar heat pipe collectors and collector plates are the two most widely used products of solar collectors. Factory productions of such products are subject to inspection before they can be put on the market. Currently product testing of this kind is performed collectively in fixed locations; consequently, it is vulnerable to the geographical conditions, climate changes, and other factors in the location. A truck-mounted solar collector testing system is a system that integrates both testing systems, heat pipe collectors and collector plates, in a vehicle, which can be driven into the manufacturers that produce heat pipes and/or heat plates or other places where testing conditions can be met according to the requirements. By doing so, the problems associated with the fixed testing system can be solved. However, design of truck-mounted type solar collector testing system is much more difficult than that of fixed solar collector testing system. In addition to testing accuracy, it must also take the reduced volume of the testing system into account to ensure that the system can be accommodated into a smaller space of the vehicle. Furthermore, the stability of the testing system must be assured. Finally a removable device needs to be added to the system for convenience. In the following, we show our design of the truck-mounted solar collector testing system and calculations for the related stress analysis.

Abstract: The butt weld of 15CrMoR with the thickness of 55mm has been manufactured with the bonding methods of manual electric arc welding (SMAW) and submerged-arc welding (SAW), and the mechanical properties of which have been tested with the corresponding test, and the metallurgical structures have been analyzed with microscope. Conclusions have been obtained as following: the metallurgical structure of multi-layer butt weld is much more complicated than the monolayer ones; only the last weld layer has the obvious zones of weld zone, heat-affected zone (HAZ) and fusion area; the weld zone and the fusion area will be heat treated with the next layers weld finished; the mechanical property of the multi-layer butt weld is much better than the monolayer weld.

Abstract: According to basic law of tooth profile meshing and principle of higher pair to be replaced with lower pair of planar mechanism, the calculating formula which is used for calculation of transmission ratio of gear pump with circular-arc tooth profile is obtained. The calculating results indicate that stability of transmission ratio of gear pump are very effected by the difference between concave arc radius of tooth profile of pinion and convex arc radius of tooth profile of wheel gear. The smaller the difference of radiuses, the more severe the wave of velocity while meshing.

Abstract: In this paper, IMP software was used to simulate different injection molding screws. And by the comparison between the experiment results and the simulation results, the software was verified accurate and reliable, then we can use the software to simulate the plasticizing process of some screws which are different in metering depth or metering pitch. By analyzing the pressure curve along the screws, the relationship between the metering depth and the pressure-developing capability, and the relationship between the metering pitch and the pressure-developing capability were obtained. The results showed that the smaller depth or pitch, the stronger pressure-developing capability.

Abstract: Exhaust noise is the main component of vehicle noise in the study of vehicle noise controlling. It is important to design a type of muffler that can match to engine and have the capability to reduce vehicle noise. At present vehicle mufflers are made by examination, therefore the time of product development is very long and it wastes material. Sometimes exhaust noise can not be reduced; in the contrary it will decrease the power of engine. The content of exhaust noise is tightly related to the temperature, pressure and velocity of combustion gas. In order to obtain the detail data of these parameters, FIRE software is used to perform the calculation of engine combustion process in this paper. FIRE is one of the advanced 3D simulation software packages and can simulate the complicated gas flowing and combustion in internal combustion engine cylinder. Its calculation result accesses to the fact and can attain gas temperature, gas pressure and gas velocity, provide reliable original data for the design of a muffler. In this paper, the basic combustion theory of internal combustion engine is introduced to the basis for the further application of numerical simulation, firstly. The geometrical model and mesh model of a type internal combustion engine are constructed by using FIRE software to analyze the working process of internal combustion engine. Based on the model and combustion theory, the relevant calculation model and initial parameters are chosen and applied into the software. A load case is designed according to the true running process of this engine. With these load cases, the combustion process is simulated in this paper. The detail distribution of the parameters such as combusted gas pressure, combusted gas temperature and velocity of the flow fields in cylinder is obtained and the relation of these parameters and crankshaft angle is given for the further research. It also provides data for muffler design by boundary element method. It is obvious that can shorten the product developing cycle and save the material.

Abstract: Though theoretical analysis and experimental verification, a direct method that measuring melt pressure fluctuation at the nozzle to reflect melt viscosity fluctuation in injection molding process was developed. Experiments for four injection molding screws and the analysis for the relationships between the melt viscosity homogeneity and screws configuration, melt temperature homogeneity, repeating weight precision and mechanical properties of the injection molding parts were conducted. At last, the four injection screws were evaluated based on melt viscosity homogeneity method.

Abstract: This paper presents a research work for the design and modeling of a new inchworm linear motor. The three actuators of the motor are based on electromagnetic and permanent magnetic combined drive. The actuator may generate large output force, large displacement and quick response. A permanent magnet cam is designed to realize the continuous and smooth movement for the actuator. The motion equation of the cam mechanism is established and analyzed by SIMULINK from which the optimal contour of the cam may be confirmed. Then the general dynamic model of the linear motor is established with a 4DOF lumped parameter system.

Abstract: A novel drive joint based on the principle of interaction between electromagnet and permanent magnet is introduced, which may be used in active vibration control. The toque model and the dynamic model of the system are built. The toque model is verified by the results of Finite Element Analysis (FEA). Finally, the dynamic simulation based on the model is carried out.