Advanced Materials Research Vols. 295-297

Abstract: This paper is aimed at dedicated computer case. The solid models of dedicated computer were built by three-dimensional mechanical design software Pro/E; the parametric design of chassis components was carried out by the Pro/E secondary development tool Pro/Toolkit. A user application was created, including user-defined menus and user dialogs, so users can easily implement the models based on prototyping parts, and repeatedly modify them until satisfied, ultimately achieving the aim of improving design efficiency and saving design cost.

Abstract: The hydraulic hatch cover is used to seal rainwater and to carry container and weather loads. The method of optimization theory based on dual method has been transplanted to optimize hatch cover structure in the present paper, and the numerical calculation model of hatch cover structure was established. The target function is the structure gravity of hatch cover, there are three kinds of constraints: yielding strength, rigidity and buckling strength. The hydraulic hatch cover has been optimized under multiple loads, the numerical calculation results meet the design requirements.

Abstract: This paper introduces a special drill machine for machining flange hole. Base on design project Specifications, discussed system compose and machining requirement. Design actuator and hydraulic system. The electric control system chooses programmable controller, according to the logic relation of processing request, design control programs with the sequence function chart, analyzed the processing cycle technological process. Point out that using the sequence function chart to design special drill machine control programs, it is logical and adaptable and also convenient on changing the programs. The programmable controller is just designed for industry control, so it is reliable and anti-jamming.

Abstract: Treating high speed milling theory as the guidance, this paper researched high speed milling process of bracket part based on Pro/E. Combined with the structural features of bracket part, three dimensional model is built by Pro/E and machining processes are worked out after analysis. Pro/E module was applied to fabricate tool paths. At last, finite element analysis method is introduced to study the processing deformation by Pro/E module, based on which measures to restrain processing deformations is advanced and processing sequences are optimized.

Abstract: In order to increase the safety and reliability of hoister in operation, this paper studies a new monitoring system for mine hoister, and G programming language is used on the LabVIEW tool platform, emphatically introduces the main function and characteristics of the system. Due to the superiority of the virtual instrument technology, the system can achieves the hoister’s position, velocity and so on, also the data analysis are achieved conveniently. The system has the advantages of simply operation, friendly interface and powerful adapting.

Abstract: In the shadow photograph system in ballistics range, the exposure time of the CCD cameras is a very important parameter. The method to measure the accurate exposure time of the CCD camera is suggested based on the short pulsed laser source, timing sequence control system, high speed photo- detector and oscilloscope with the precision of 0.1μs. This method solved the problem of no effective measurement method with high precision for this parameter. The accurate minimum exposure time of IGV-B4820 of company Imperx was tested by this method successfully.

Abstract: In order to make the structure design of winch drum reasonable and reduce the gross mass of winch, the main components of storage winch were optimize designed on the premise of not affecting the safety use of storage winch. By applying the SoildWorks software, the storage winch model was established, and finite element analysis for the model was also carried out by Simulation. The maximum principal stress of drum under the most dangerous operation condition was obtained, and wall thickness of drum, web thickness, web position and hub thickness were all optimized. After the optimization analysis, it was found that the maximum stress on the drum decreased but then increased along with the increase of the wall thickness of drum. Meanwhile, the unreasonable structure was improved and the gross mass of drum of storage winch was reduced. Furthermore, the more reasonable structure design was achieved. The study provided important theoretical basis for the product design.

Abstract: Aiming at the question of high-speed spindle’s long development cycle, take the structural design and the performance analysis of cnc machining center’s high-speed spindle system as key points, use the cad technology, fea technology,dynamic simulation technology and virtual design theory, and integrate them into an integration technology, the virtual design and analysis software system devoted to the cnc machining center’s high-speed spindle was developed too, and gave parts of the operating instance. Through the practical application in one large-scale enterprise of machine tool, the fea sibility and practicability of proposed system principle and implementation techniques were verified, and the better design quality and higher efficiency were shown too.

Abstract: The invert arch floor of large plunge pool is composed of some discrete arch blocks divided by construction joints. The joint is only 1 mm wide. Under the uplift pressure, the mechanical behavior belongs to highly nonlinear problem, which is difficult to simulate by finite element method. Based on NMM (numerical manifold method), the kinematic motion process of the invert arch floor is simulated under the different uplift pressure. Calculation results show that: as the uplift pressure increasing, each arch block gradually rises, rotates, contacts with adjacent blocks and the expansion joint width between adjacent blocks reduces. When uplift pressure reaches 85Kpa, the mutation of expansion joint width emerges and the invert arch floor finishes self-lock process which indicating the invert arch floor start playing statically indeterminate role to keep stable. The bearing capacity of the floor is determined by concrete compressive strength and anchoring strength of two arch abutments.

Abstract: In this paper an improved genetic algorithm based on the simplex self-mapping fixed point algorithm is proposed. With this algorithm, the optimal problem of n-dimensional closure function will be transformed as the solution of approximate fixed point problem of n-dimensional standard simplexes by homeomorphism mapping. The genetic operators relying on the integer labels are designed. In this case, whether every individual loading simplex of the population is a completely labeled simplex can be used as an objective convergence criterion. The simulation results demonstrate that the proposed algorithm is valid and effective.