Advanced Materials Research Vols. 430-432

Abstract: Beginning with the disassembly of the semi-finished modules, the general assembly process of satellites is quite different from that of other mechanical products. This kind of disassembly-reassembly process cannot be solved by the widely used cut-set theory that only deals with linear problems, thus an approach called Dynamic Transition Graph (DTG) is proposed to solve this nonlinear assembly sequence planning problem. By analyzing and verifying possible assembly statuses hierarchically through matrix operations, a DTG is produced on the basis of Liaison Graph, where the DTG includes all the geometric feasible assembly sequences for the general assembly of satellite. Finally, the effectiveness of this method is verified by an example.

Abstract: In order to provide a theoretical basis for the alignment regulation of prestressed box-girder bridge with corrugated webs, so that the control for alignment can be more targeted. Optimization model of alignment regulation for cantilever constructed pre-stressed box-girder bridge with corrugated webs is proposed based on optimization principle. The sensitivity of alignment error, transverse stress of bottom plate and transverse deformation of corrugated web with respect to design parameters is analyzed during three classical construction stages. The results indicate that the concrete density, concrete elastic modulus, longitudinal and transverse pre-stress are key control parameters of alignment regulation; alignment error is not sensitive to the change of uniformly distributed temporary loads; the cantilever state at one fourth span is most sensitive to the change of design parameters.

Abstract: the application of membrane materials in construction and interior design did not attract much attention until the application of membrane in Water Cube. By applying new building materials to home decoration design, we can make interior design more brilliant and meet high-end pursuits. Membrane materials are lightweight, tensile, pliable and highly resistant to UV and chemicals. They have long useful life, self-cleaning ability, translucence and high melting point. The application of these materials will make villa design refreshing. Besides meeting people’s needs for a comfortable living, they are also more environment-friendly.

Abstract: The robust design in early design phases has crucial effect on the quality of product. It aims to design a product that satisfies customer needs while ensuring minimal effects of environmental variations. So, it is very necessary to research on the system robustness. Axiomatic design generally leads to design robustness, which can easily represent system structure, capture design requirements, and identify functional requirements. The objective of this research is to develop a robust design framework that can analyze robustness of mapping process from the functional domain to physical domain in axiomatic design. It can improve the system robustness to the variations in design parameters and design matrix characteristic uncertainty. Two separate optimization objectives are traded off in the compromise decision support problem (cDSP). The essential of this framework is to infuse the robust design concept into the conceptual design process. The proposed method is demonstrated with an example on the structure uncertainty design.

Abstract: Hybrid actuation system (HAS) with dissimilar redundancies conforms to the development trend of future actuation systems in more electric aircraft (MEA). Hybrid Actuation system is composed of a traditional servo valve controlled hydraulic actuator (SHA) and an electro-hydraulic actuator (EHA). It has two operating models, active/passive mode (A/P) and active/active mode (A/A). In A/A model both actuators are actively controlled. Corresponding to A/A model, SHA is actively controlled and EHA is passively controlled in A/P model. The hybrid actuation system is built in the AMESim simulation environment, comparative analysis is performed when system operates in these two modes, such as signal response and force fighting. The simulation results provide a guideline to determine the specific operating mode of the system in different circumstances.

Abstract: Based on system technical specifications,we established optomechanical design and analysis for a rotating telescope optical system. Firstly, modal analysis was done for the main optical barrel. Secondly, Analysis on the changes in MTF caused by changes of temperature was finished, and obtained the MTF trend corresponding to changes of temperature for two different materials. Finally, Analysis on the changes in MTF caused by rotating performance based on experimental data was done and proposed the requirements of rotating performance based on MTF. Through the above analysis, it is proved that the structure of rotating telescope optical system can achieve the requirements of original optical design.

Abstract: The machine tool bed is an important fundamental unit of the Machine tool, and its static and dynamic characteristics directly influence the precision of the Machine tool’s process. The precise composite B2-K3000 CNC grinding machine bed is made from artificial granite. Through entity modeling, adding the boundary conditions and stress conditions to the bed, this article analyses the static stiffness, natural frequency, vibration mode and harmonic response of the grinding machine bed, and masters the natural characteristics and preponderant natural frequency.On the basic of the bed’s structure characteristics and stiffness requirements, the original bed’s structure gets partial improvements. By increasing the number of ribs and using the cross-shaped ribs, the improved result indicates that the bed’s static stiffness can be enhanced obviously and the bed’s static and dynamic characteristics can be more excellent.

Abstract: In order to verify the effect of plant protection design program of a highway slope in the western of Henan, the artificial simulating rainfall and runoff scouring test were carried out. The results showed that, under the condition of design frequency heavy rains, if the site conditions and the measures of plant configuration were different, the morphological characteristics of slope erosion were different too. There were some difference among the size, quantity and morphological changes of slope erosion gully. The rill width and depth of brown loess slope was biggest, and the bill average width and depth had a significant relationship with its length.

Abstract: Forging temperature is usually around 1000°C in free forging scene. Manual measurement leads to large measurement errors. Adopting the non-contact 3D scanning technology, make the laser beam sweep across the forging surface to get three-dimensional coordinates of the points on the forging surface in space. Neighboring scan points separate by less than 0.25mm. The measurement error is less than 6mm. The coordinate^,s data are sent to the LabVIEW procedure. The procedure analyzes the coordinates to calculate the size of the large-size forging to realize automatic measurement of the forgings. The procedure can also reconstruct the image of the large-size forging. These make us detect the real-time changes of the forging far from the free forging scene.

Abstract: In order to study the damage capabilities of multiple hulls structure under underwater explosion, the damage mechanism of contact blasting and noncontact blasting on target is analyzed, and the formula of shock wave in water goes through multiple hulls structure is put forward. Using armor plate and aluminum plate、copper plate、rubber plate as models respectively, numerical simulation is done by LS-DYNA, the stress distribution and displacement of multiple hulls structure under underwater contact blasting are got. Lastly, test research on damage capabilities of multiple hulls structure under underwater explosion is finished. The result shows that the anti-explosion capabilities of multiple hulls will improve greatly when underwater ship adopted this kind of structure.