Advanced Materials Research Vol. 940

Abstract: s: The 3D model of cooling water cavity was set up, which was in a four cylinders gasoline engine, and the CFD analysis was done after setting the CFD calculation model and boundary conditions. The CFD analysis results shows that the structure design of engine’s cooling water cavity can meet the requirements basically, but there are some zone in which the water speed is lower than 0.5m/s, and there are some whirlpools in cylinder water jacket. In order to improve the cooling effect of the engine, the cooling water inlet channel and cylinder head should be improved.

Abstract: In view of the fact that the complex control of car moving device, its small application range, the difficulty to reach the accurate location of vehicles and so on, therefor a new design and research for a car moving device of remote control is proposed; The Mecanum wheel is chosen to achieve the omnidirectional movement, so that the vehicle can reach the predetermined position quickly. The electro-hydraulic push rod is used to realize the automatic lifting ,and it is also convenient and efficient; In addition, AT89C52 microcontroller which cost less but can meet the requirements realize the control.

Abstract: According to the demand of accuracy detection of the motor energy efficiency, the hardware of testing bench for motor based on torque-meter method was designed. A design emphasis on loading equipment and torque sensor was introduced in accordance with the requirements of torque meter method, realized the rapid response of the load, the low speed stability of the work and electrical energy reutilization. The proposed error modification method ensured the accuracy and reliability of test results.

Abstract: A new kind of three-dimensional (3D) circular loom was advanced. With the help of the integration theory of the Axiomatic Design (AD) and Design Structure Matrix (DSM), the whole system of the 3D circular loom was well designed. It not only can weave nylon yarn and aramid yarn which have good wear-resistance property, but also can weave special fibers without serious damage such as carbon fibers which are fragile. And based on this, one case was used to present the theoretical derivation of compound design matrix AD and DSM. Some schemes of mechanical design were proposed to solve the current problems in the process of carbon fiber weaving.

Abstract: Current climbing appliances are difficult to ensure the steady change from walking to climbing. Consequently, we come up with a climbing mechanical appliance, design it and analyze the appliance on rationality and feasibility. The appliance is lifted by rack and pinion mechanism. In order to ensure smooth and steady movement of the appliance, a counterweight balancing mechanism is designed to adjust the centroid according to actual situation. Through the movement principle analysis of transmission mechanism for the appliance, we build its 3D model by SolidWorks. A simulation analysis has also been provided to examine the feasibility of transmission mechanism under the help of ADAMS.

Abstract: Developments of products and technologies always follow certain objective law and the same objective law can be applied in different technical fields. the innovation processes of any products follow a law, the development of all technical innovation is toward maximum function. By applying some technical evolution paths, this paper analyses the technical development process of Converter Tilting Machines and forecasts the future development. The evolutionary paths of converter tilting mechanism has been analyzed by using TRIZ Theory, and, the development of Converter Tilting Machine has been forecasted. According to the path toward flexibility, we can forecast that Converter Tilting Machine can be driven by Filed force.

Abstract: Under the national trend of manufacturing information and integration, cold-rolled sheet plants (CRSP) have begun to transform the manufacturing information in order to meet the fierce market competition. The upper information management (ERP) has already been basically realized in current market. However, the lower automation system and the upper information management system are not well integrated, causing a series of problems, such as basic data delay in the production line, being difficult to keep unanimous with the upper data and so on. To solve the above problems, efforts are paid on the combination of the manufacturing information system requirements and the research of MES system architecture, a set of MES system is established and the whole system architecture and function modules are designed in detail. Through the simulation of this system, it finds that the logistics and information flow can keep unanimous and the production efficiency will be greatly improved, which will create greater economic benefits.

Abstract: A newly developed four-station translational and rotary worktable can be applied for complex human-machine hybrid operations and dangerous heat treatment operations. And the design can guarantee closed operations without involvement of human when the worktable rotates to the concentrated area, while the installation or other manual processing when the worktable rotates to the separate area. In addition, by designing innovative rotating and track-changing mechanism and the direction-holding mechanism, the work piece remains the constant direction in the rotation process. Furthermore, the interference problem of the Geneva mechanism of the track-changing fork is analyzed. Consequently, the smaller the angle of fork notch is, the smaller the force that fork reacts on the support shaft is, meanwhile, the strength can be satisfied more easily. The optimal angle of Y-fork is 90 degree. The application of the four-station translational and rotary worktable can achieve multi-step continuous process, save workspace and improve production efficiency.

Abstract: Neglecting the influence of static transmission error, a non-linear dynamic model of spiral bevel gear pair with time-varying backlash was presented. Through the simplification of above model, the dimensionless form of gear system was obtained. Then, the dynamic characteristics of gear system were acquired by using Runge-Kutta method under the influence of time-varying backlash and torque. The results showed primary harmonic amplitude of gear backlash and torque had a significant effect on the non-linear and vibration characteristics of gear system. With the change of that, bifurcation phenomenon, quasi periodic motion and chaotic motion were detected. In addition, the variation and fluctuation of amplitude, containing displacement amplitude and velocity amplitude, were analyzed detailedly.

Abstract: Ensuring the safe operation of pipeline and monitoring it to prevent sudden accidents are an important task of current nondestructive testing work because of our country is in the peak period of long-distance pipeline construction. Welding cracks are common and most dangerous flaw in the root of the failure of the welded joints . Metal magnetic memory method is the only viable detection , evaluation method currently used for diagnosing the stress-strain state of serving welding crack in the early stages. So this article designs weld cracks of the general pipeline, establish a method to detect pipeline weld crack by metal magnetic memory method.