Applied Mechanics and Materials Vols. 152-154

Abstract: In this paper weight optimization of sandwich structure consisting of a honeycomb core sandwiched between two layers is presented through the use of Sequential Quadratic Programming & Genetic Algorithm by constraining of certain parameters such as buckling stress, cost and geometry. The variables to be optimized are core height, face sheet thickness and cell thickness for an effective design and better performance of the entire structural system. Sequential Quadratic Programming in Matlaband Genetic Algorithm technique with high robustness is performed and comparison between the two results is made for early convergence of the variables to be optimized. In this way, the structure could easily be monitored for any volatility, and avoid probable failure by employing proper remedial action.

Abstract: SIFT is the most common algorithm for the image local feature points matching. The excellency of it is not only good spatial scale invariance, but also more accurate and faster than other algorithm. However, the SIFT feature points do not reflect the geometric features of objects, so, when dealing with the building images, these points are not available in most cases, and the extraction process is complicated. Therefore, this paper presents a new algorithm that combines the Harris corner detector and SIFT operator. This new algorithm not only can enhance the efficiency of image matching, and make accurate information on the building corner, but also provide good reference information for modeling. Experiments show that the extract feature points of this algorithm can be applied to the three-dimensional reconstruction of large buildings.

Abstract: Respectively considering both the condition of the main steam pipe rupture position at the reactor cabin and cabin behind the reactor cabin, the accident process of the main steam pipe rupture is analyzed, the mathematic and physical model about the transference, leakage and diffusion of the radioactive nuclide is established. Through the method of coupling the thermodynamic calculation result with the radioactive result analysis model, the calculation of the nuclide radioactive concentration in the cabin is realized. Further more the harm of the radioactivity has been analyzed. The research of the paper has provided a basis for the effective constitute of the radioprotection measure in the accident.

Abstract: We designed a set of non-destructive system which is based on ray inspection systems, it mainly used to detect the Green Channel Cargo, and the result will be given out within 30 seconds. The ray coefficient of the Green Channel Cargo are different from the other transport cargo, so we can measure the absorption coefficient and compare it with the standard samples which is pre-built. The moved radioactive source and detector are designed, in order to prevent the mixed goods, we designed the removable radioactive sources and detectors, so the goods can be scanned up and down and around. Once the goods are mixed together, the ray coefficient which is calculated synchronously will be abnormal, parking and manual inspection is a supplementary means, so as to achieve a low-cost non-destructive testing.

Abstract: The purpose of this article is to realize the automatic on-line measurement of work coordinate system using Renishaw probe on the NC machine. We examined the application of Renishaw probe，and we use evolutionary analysis of the typical case to measure the coordinate system of the workpiece, and develops the parameter program. Besides, we experimented with the method based on Fanuc-18i.The related data is recorded in the course of the experiment, and we analyzes the error finally.

Abstract: Based on the analysis of the movement relationship among systems such as the chassis suspension and the steering and braking system, simulation and testing are carried out on control system of the vehicle chassis system with a coordinated control method of the hybrid model. For the complex vehicle chassis system, modeling and simulation focuses on the movement effects of the three subsystems, classifying complex under different conditions by control methods and testing control parameters separately. Based on the simulation results of the vehicle and the parameters of the controllers, software & hardware systems of the vehicle are designed, and the tests of the vehicle chassis system are carried out based on the hybrid model. The results indicate that under complicated conditions, control systems with the hybrid model can effectively improve the ride comfort, handling, and security.

Abstract: Nowadays the information security is one of the fundamental and important issues in information management. Utilizing a collection of policies, solution, tools, hardware and software is for the purpose of obtaining an environment in which the information is not threatened while being produced, refined, transferred and distributed. Obtaining such an environment entails doing some things which are called security requirement. Therefore, for meeting those requirements in this project a symmetrical encryption algorithm has been designed and performed.

Abstract: Cavitation typically occurs when the fluid pressure is lower than the vapor pressure at a local thermodynamic state. The aim of this paper is a numerical investigation of the cryogenic cavitation flow characteristics, considering variable thermodynamic properties of liquid nitrogen and numerical simulation liquid nitrogen around hydrofoil cryogenic cavitation flow characteristics. Based on homogeneous flow model and Zwart cavitation model, calculates hydrofoil isothermal and cryogenic cavitation in liquid nitrogen steadily, updates the evaporation and condensation coefficients of Zwart cavitation model, gives the hydrofoil surface pressure profile, temperature depression and distribution of cavitation intensity, contrasts the isothermal and cryogenic cavitation flow characteristics. Numerical results show that thermodynamics effect in cryogenic liquid cavitation significantly. Meanwhile, the hydrofoil surface pressure and temperature numerical results with experimental data and more Hord compared to verify the validity of the numerical simulation.

Abstract: A new-style efficient heat-pipe heat exchanger on flue gases has been designed and made in Shanghai Institute of Technology. The heat transfer efficient of the heat-pipe heat exchanger is high; its structure may be changed according the parameters of different flue gases; it may also be used conveniently by advantageous installation; most parameters of the heat-pipe exchanger may be measured and saved. This new-style efficient heat-pipe exchanger will be widely used in many areas in industry.

Abstract: A new hydraulic model based on the structure analysis of the vane damp was established , which can be given the damping parameters directly. Based on damping force and velocity input test data, the parameters about the hydraulic model are identified by least squares fitting method,which is using to study the damping characteristics .Each parameter has its own physics meaning not only the math way, but also the physical influence. The method can be reduced the vane damp process and fix error. In the different temperature, comparison of the test data and results of calculation with the fitting parameters shows that the parameters are correct and the method is valid. Vane damp design and character analysis can be supported and the damping characteristics simulation method can be extended.