Advanced Materials Research Vols. 989-994

Abstract: Automotive abnormal sound is an important manifestation of the automotive system components early malfunction. It can effectively improve safety and reliability of the vehicle system by characteristics extraction of abnormal vehicle sound and prediction of the development trend of fault. What’s more, it can solve the problem that ECU can’t identify tire failure and other problems. As a result, it will reduce the number of traffic accidents, protect human safety and property.

Abstract: Construction machinery hydraulic cylinder is usually discarded after service cycle. The residual value of discarded products can be recycled greatly by remanufacturing. Disassembly and assembly is the key process in hydraulic cylinder remanufacturing. The construction machinery hydraulic cylinder disassembly and assembly equipment is developed. Hydraulic power is adopted in this equipment. The clamping, positioning of cylinder tube is realized by hydraulic clamping mechanism automatically. The piston component pulling out or into cylinder tube is realized by hydraulic working mechanism automatically. This equipment has been applied successfully in the project of "key technology and equipment for construction machinery parts remanufacturing" in a research institute. The results indicate that the application of this equipment will not only increase the automaticity and efficiency remarkably, but also reduce the damage to hydraulic cylinder key part greatly.

Abstract: The worm geared transmission chain is widely employed in rotary feeding table of machine tools. This article proposes a static stiffness model and conducts sensitivity analysis of the transmission chain. Firstly, a unified static stiffness model is established, considering meshing stiffness, torsional stiffness and pre-load related axial stiffness of worm shaft. Then sensitivity with respect to individual stiffness element is derived based on partially differentiating method. Simulation results show that the closer to the end gear pair or shaft is, the more sensitive meshing stiffness or torsional stiffness is.

Abstract: High speed milling is a newly developed advanced manufacturing technology. Surface integrity is an important object of machined parts. Surface roughness is mostly used to evaluate to the surface integrity. A theoretical surface roughness model for high face milling was established. The influence of cutting parameters on the surface roughness is analyzed. The surface roughness decreases when the cutter radius increases, total number of tooth and rotation angular speed, while it increases with the feeding velocity. The high speed face milling can get a smooth surface and it can replace the grinding with higher efficiency.

Abstract: This paper analyzes the electric inertia simulation method deeply. By analyzing the brake torgue in the braking process, this paper makes a conclusion about the relationship between the moter’s torgue in the braking process and the simulation of inertia. The test uses the method of combining the mechanical simulation and electrical simulation. In this method, it invites the test platform of electric bicycle brake force, and realizes the inertia simulation. On the test platform, the results showed: by using the electric inertia simulation, the performance of the system is obviously better than the one on the test platform which using flywheel groups. This method improves the degree of automation on the test platform.

Abstract: This paper addresses the robust stabilization problem of interval time-delay systems. By applying an upper bound to the Riccati equation approach, a stabilizability condition and a controller are proposed. It is easy to test the presented condition and to implement the controller.

Abstract: Thermal barrier coatings (TBCs) were developed to increase the operating temperatures of turbine blades in gas turbine engines. Non-contact inspection and the ability to penetrate into dielectric materials are two of the most important attributes of microwave non-destructive evaluation (NDE) and make it suitable for the non-destructive inspection of TBCs. In order to improve the detection sensitivity, it is important to optimize operation frequency. Computer simulation technology-microwave studio (CST-MWS) was used to optimize operation frequency in the evaluation of the top coating (TC) porosity and the metal substrate surface defects using microwave NDE. The results showed that the sensitive frequency is different when the TC thickness of under detection changes. So, it is necessary to choose appropriate operation frequency according to TC thickness to evaluate TBCs using microwave NDE.

Abstract: An aluminous honeycomb sandwich panel with some structural damages was selected as the objective in this study. The panel was simply supported along four edges and its natural frequency data was collected through modal experiment with a hammering method. Application of frequency dactylogram method for honeycomb sandwich panel damage is identified. The detection results show that the frequency dactylogram method can be constructed using the frequency data of honeycomb sandwich panel, which is only related with the positions of damage and not the degree of damage.

Abstract: The phenomenon of laminar flow in the micro-channel is demonstrated by the software simulation. It shows different velocity produces different flow layer. Water-in-oil droplets are obtained by the experiments. These experiments take water as the dispersed phase and take the oil as the continuous phase. Analyze forming process and forming factors of the droplets and the column flow. The main factors of forming droplets are surface tension, viscosity shear force and the liquid velocity. The size of droplet is associated with the flow and channel width of two liquids. Changing the pressure of the inlet can obtain droplets in different size.

Abstract: One of the research works of network control systems is the effect of network upon control systems. A simulation platform of networked control systems is designed for this purpose. Matlab is used to build models of real systems. Communication between controller and process is fulfilled with Winsock. The simulation platform supports many control algorithms and gives good environment for the analysis and gives good environment for the analysis and design of networked control systems.