Advanced Materials Research Vols. 308-310

Abstract: Collaborating among engineers is very important in modern design of complex system. A Information system is usually used to help engineers to get the basic information for product design flexibly and officially. But the gap of different system blocks the information transmitting, and interrupts the process of business flow. A Business Integration Model based on XML exchange file is discussed in this paper. It is conceived to help engineers working on engineering design transmit information and arose process between different application systems.

Abstract: Product redesign is hardly a straightforward process, especially for complex products. The existence of intricate interrelationships between different components of product design architecture makes it more susceptible to change propagation phenomenon. In this case, redesign risk is not easy to predict since the change effects are being propagated to other components from the initiating change component. Because of this condition, choosing the right initiating change component is essential to control redesign process risks, apart from being able to successfully satisfy the product requirements. With this notion, this paper proposes a method that systematically ranks all components of an existing product design based on their estimated redesign risk. By having this information, designers can make a better redesign planning. The demonstration of this method is presented through an example aircraft redesign case study.

Abstract: This paper refers to the finger cutter forming method to process large-size spiral bevel gears by using processing principles, tools, processing technology and path equations. In the actual production process, the method is made a rapid development for the revolutionary innovative process of large spiral bevel gear. The method of research is different from the disc cutter, so the processing of large spiral bevel gears have a new processing method to achievement.

Abstract: The bagasse fibers were activated by alkalize and etherified. 1,2-ethanediamine and carbon disulfide were used to modify the etherify fiber to get the chelate-fiber contained sulfur and nitrogen. The FTIR was used to characterize the xanthated aminating-fiber (XAF). The mechanism of sorption properties for heavy metal ions were studied. As the results shown, the optimal process to prepare the XAF was that the reaction time, concentration of NaOH and dosage of CS2 was 60min, 12% and 2mL, respectively. The chelate-fiber containing sulfur and nitrogen possessed high adsorption capacities for Cu(II) and the mechanism of sorption fitted the pseudo-second-order model well.

Abstract: Cyclone separator has been widely used in power, chemical engineering, etc and has been one of the most accepted separators for gas-solid. To obtain the optimal experimental model, the flow field and particles trajectory from different structure of cyclone separator were simulated and compared using RNG κ-ε model in FLUNT software. Then the optimal experimental model was obtained. Furthermore, the velocity and pressure in this model was simulated and analyzed. This optimal experimental model might provide basis for further designing effective and low-power-consumption cyclone separator.

Abstract: The aerostatic circular thrust bearing was taken as a study subject. The numerical simulation method was used to calculate the flow passage. Meanwhile, the single-point testing method was used to test the pressure distribution. The simulation and experiment measurement results were compared and analyzed. The results show that: The single-point testing method is effective to capture the change of flow characteristics. The overall results of simulation and testing coincide with each other well. In the range of cone cavity, the flow pattern for the gas is turbulent flow, and the flow field should be divided into different zones for simulation.

Abstract: This article introduces the composition and classification of Photovoltaic power system, makes Photovoltaic Grid Power System as an example, and Research the problem that is met in the grid operation process—Chaos Oscillation. For Chaos Oscillation problem in the Photovoltaic Grid Power System, paper elaborates conventional control method on Chaos, comes up with the theory that is applied to control method in Chaos Oscillation using Feedback Linearization to design a tracking controller to make Chaos Oscillation disappear in Photovoltaic Grid Power System.

Abstract: Good sound-feeling is more important than noise strength for industrial products, especially for household appliances. In the paper, the control method of good sound-feeling of vacuum cleaner is researched based on the theory of soundscape. For the purpose, a special method of sound forge and evaluation technology (SFET) is utilized. For the method, first the spectrum of vacuum cleaner is analyzed to obtain its spectrum characteristics. Second by means of spectrum forge technology, the frequency spectrum of vacuum cleaner is modified and compiled to make the testing samples. Third based on the sound subjective evaluation, the optimum compiled sound sample of vacuum cleaner is acquired. At last, according to the optimum sound sample, the structure of product is modified to obtain product sound of good-feeling. In the paper, the spectrum of vacuum cleaner noise is analyzed, according to the spectrum, the method of sound forge is discussed. In the end of the paper, the virtual simulation of soundscape of vacuum cleaner is designed by means of some software to give an example of optimizing soudscape.

Abstract: This paper describes the design and fabrication of dual-mode film bulk acoustic resonator (TFBAR) devices to construct wafer level dual-band T-ladder type filters. The T-ladder type filters is selected in this study for its high quality and simple fabrication processes. The c-axis-tilted ZnO thin films to obtain dual-mode TFBAR devices have been investigated. The characteristics of dual-mode TFBAR devices appeared by off-axis deposition of ZnO thin films with the RF magnetron sputtering. The top and bottom electrodes consisted of titanium (Ti) and platinum (Pt) layers are deposited by dual-gun DC sputtering system. The pass-band width of filters is controlled by the mass loading on the dual-mode. The frequency response is measured using an HP8720 network analyzer and a CASCADE probe station.

Abstract: Multidisciplinary design and simulation is a very effective process to balance the different discipline design requirements and gain the optimal design result. The paper proposes a master model approach in order to maintain the model associativity and consistency in multidisciplinary design and simulation for compressor blisk. The research presents a master model-centered model structure, which is composed of master model, context model and application model. In the proposed master model-based multidisciplinary design and simulation process, master model is the kernel model and shared by each discipline. In addition, there is an associative relationship among these models. Then, the paper studies the modeling method for the master model of blisk and the model mapping and associativity maintaining method for multidisciplinary design and simulation. A series of computation results demonstrate the performance of the proposed approach.