Papers by Keyword: Safety Design

Abstract: In this paper, the finite element method (FEM) based on GTN model was used to investigate the in-plane/out-of-plane constraint and strength mismatch effects on local fracture resistance of A508/Alloy52Mb bimetallic joint. The J-resistance curves, crack growth paths and local stress-stain distributions in front of crack tips were calculated for cracks with different constraints and strength mismatches. The results show that the local fracture resistance of the interface crack in this joint is sensitive to constraint and strength mismatch effects. With increasing in-plane constraint (crack depth a/W), out-of-plane constraint (specimen thickness B) and strength mismatch degree, the plastic strain and stress triaxiality around crack tip increase, and the corresponding crack growth resistance decreases. The crack with strength mismatch factor M=1 displays a markedly higher crack growth resistance than the other cracks with M>1 and M<1. It also has been found that there is an interaction between in-plane/out-of-plane constraint and strength mismatch for the bimetallic joint. With increasing in-plane/out-of-plane constraint, strength mismatch effect on fracture toughness becomes weaken. For accurate and reliable safety design and failure assessment of the bimetallic joint structures, the effects of constraint and strength mismatch on local fracture resistance need to be considered.

Abstract: Starting from the introduction of the management of scientific research project, and then gives a detailed description based on J2EE architecture, the lightweight composite framework involving Spring, Struts and iBATIS and an iterative method is employed in project management. With a series of functions such as application, recommendation, processing, approval, assessment and management of scientific research project and so on, the system has the characteristics of easy maintenance, dynamic propagation and strong expansibility. Finally the safety of the system is discussed from two perspectives, namely its design and environment. Years’ of application in the management of scientific research project in Gansu Province has proved its good stability, fast response and high safety.

Abstract: Clinical treatment for mandible defects is Mandible Reconstruction Surgery (MRS) including bone grafts, distraction osteogenesis and bone tissue engineering, however, MRS is operated by doctors without 3D navigation at present which leads to lots of disadvantages such as bad operational control, low positioning accuracy and poor stability. Therefore, a robotic surgical system was designed to assist surgeons on manipulating. For this study, the robot system was given in brief, then mechanical design and control system of the novel three-arm robot.And experiment results in this study show that the robot works stably and accurately. The development of this medical robot system contributes to the promotion and popularization of the MRS in clinics.

Abstract: Studies have shown that a large proportion of the construction accident causes can be traced back to insufficient safety planning and design. The essence of incorporating the planning and design stage into construction safety risk management is an idea of “forward prevention” and “source management”. In this paper, bridge engineering as an example, a development idea of construction safety risk assessment during the planning and design stages in China were presented, such as perfecting a basic theoretical system, combination of legislative push and engineering practice, derivation the safety planning and design from the project construction status, etc. Chongqi Bridge and Taizhou Bridge engineering cases showed the construction safety could be built by improving the safety planning and design of the project, which could reduce the safety risk and thereby cut down the casualties and health hazard in the construction process.

Abstract: Load sharing metal lined composite pressure vessel(COPV) enables significant safety and reliability over those vessels with non-load-sharing metallic or non-metallic liners, The key technical challenge in developing these vessels will be to calculate the optimized liner thickness and liner elastic strain. This paper presents techniques developed at Lanzhou Institute of Physics(LIP) for the design of elastically operating metal liner COPV in terms of NET theory which modified by LIP. Five metal materials are discussed and analytical techniques for determining liner thickness are presented, selection of materials for maximizing performance and minimizing weight is discussed. L490A-COPV development is introduced, performance factor is improved from 23 Km to 29.5Km.

Abstract: The objective of this study is to calculate, design and evaluate support structure safety of regional wind system engineering. First of all, wind loading was calculated based on the building structure norm. Secondly, support structures of regional wind system engineering were designed using CAD. Finally, structure safety of regional wind system engineering was analyzed with finite element ANSYS software. The results showed that the wind system engineering structure is away from harmful fluctuating. Wind load cycle does not match resonance phenomenon. Under fluctuating wind loads, the engineering windbreak structure displacement and stress were dynamic amplification effect. It was concluded that this method can keep safety in support structure design of regional wind system engineering.

Abstract: Wind turbine’s Low Voltage Ride Through(LVRT) ability must be verified by site-test, safety design was key factor of wind turbine’s mobile LVRT test device design and development. Based on research of protection scope, design principal of safety design, this paper realized five aspects of safety design: switchgear selection, relay configuration and setting value, routine operation, self-check failure lock, operation regulations. Safety design realized by this paper did not affect normal test process, colud provided perfect protection to operator, wind farm facilities and test device. Test device complied with this design had been used in wind turbine site-test and perfected well.

Abstract: The anti-fatigued design is an important field in product lifecycle management. A uniform criterion of annularly breached spindle was put forward in this paper. The crack, V-notch, U-notch and arc were described as breach uniformly according to the tip radius, depth and field angle of breach in the method. The connection between sharp V-notch and crack, between V-notch and U-notch has been set up. We fuse the fatigue fracture theory and life prediction techniques together on the design technology of lifecycle safety guarantee of mechanical structures. The relationship between life and detectability of the breached spindle system was discussed to provide useful guidance for practical applications. The criterion for the safety design and fracture design both of which on fα was obtained. The criterion of annular breached spindle under torsion was obtained at first and then the effects of bending to lifecycle of spindle were analyzed.

Abstract: The process of the safety design process, the structure principle and the key technology are described. The technology of dual molder, gas-water combined condensation, online fire fighting and infrared thermo-induction automatic disconnecting relief valve is used in this machine, which , compared to the current domestic “erect-pit output” technology, enjoys higher security & reliability during the production, higher effiiciency and better stability of the products. It perfectly meets the demand of the “horizontal output” process.