Advanced Materials Research Vols. 631-632

Abstract: For the braking performance investigated when vehicle was on the road of different road adhesion coefficient, the match of ideal braking force distribution curves of front and rear wheels and front and rear arresters was studied. The concept of braking performance to reflect "braking force utilization" was introduced.The braking force utilization algorithm came out depending on the different matches. A light bus was chosen as an example. Vehicle braking performance under different road adhesion coefficient was studied in detail.At the same time, vehicle braking performance under different matches was studied with braking force distribution value changed. The results indicate that, braking force utilization appears first increased and then decreased with the increase of road adhesion coefficient.Along with the increase of braking force distribution value,the braking force utilization decreased on low adhesion coefficient road,then increased on high adhesion coefficient road.The method could evaluate the braking performance on the road of different road adhesion coefficient efficiently.

Abstract: By experimental and comparison method, printing characteristics of light paper were studied. A test form was designed for monitoring reproduction processes and evaluating reproduction characteristics. Then it was output on film, plates, and paper in turns. Results showed that performance of paper has a direct impact on reproduction quality; prints made by light paper have less color saturation, lower print contrast, much dot loss in light areas and less color gamut than those by offset paper. However, the difference between them was very small. Under good control this environmental friendly paper was absolutely able to the high quantitative offset paper in book printing. Effective measurements of improving printing quality on light paper printing were derived

Abstract: With more and more attention being paid to anti-shock of the warship by many country’s navy, it is of practical significance to study the anti-shock characteristic of the diesel engine which belongs to the A class facility on warship. Owing to the high price of shock test, simulation combined with partial shock test methods are adopted by many countries to ensure the facility’s anti-shock performance. A numeric virtual platform of TBD234V6 diesel engine generator set is built by means of software MSC.ADAMS and four machine feet of the diesel engine are modeled flexibly. The virtual shock test of the generator set is conducted on this platform according to the German shock standard BV043/85 and anti-shock performance limits of the machine feet is obtained. Hammer experiment is also carried out on the real generator set. After the comparison of the simulation results and the experiment results, the deficiency aspects need to be improved are pointed out at last.

Abstract: Light alloy disc wheels are used in daily transportation very extensively, wheels need not only an artistic external, but an excellent performance that up to standard. According to Chinese National Standard-CNS 7135 [1], this paper study about 13° impact test by using finite element software – ANSYS, applying theory of elasto-plastic mechanics, and considering the effect of tire absorption. So we estimate the absorption percentage of tire effect in three cases, 0%, 20%, and 40%. By Reducing the striker kinetic energy to compensate for tire absorption, and after the analytic results compared with the experimental results, the analytic results can put to the proof.

Abstract: When the PROTOS cigarette machine for paper printing system is expanding the cigarette paper, it produce a lot of dust which easy to adhere to the ink roller and stamp fonts gap, leading to the cigarette stamp dirty, fuzzy cigarette product quality defects. To solve this problem, a negative pressure vacuum system is installed inside the guide rod of the cigarette paper, which help to discharge the cigarette dust to the dust removal system, and improve guide ring of the guide rod to reducing the friction. The application results show that the negative pressure vacuum is an effective solution to solve the dust floated problem. The unqualified rate reduce from 161.3PPM to 26.1PPM.It improve the effective operation of the device and ensure product quality.

Abstract: The system design and optimization of the hull of a jack-up platform was presented in the paper, based on finite element method and size optimization theories. Three-dimensional model of the hull was made by the design parameters, the size and the layout of the various compartments were determined. The finite element model was built, the analysis and calculation of the hull in some load-cases requested in the China Classification Society were done. The thickness of the steel plates were optimized to be less based on the analysis results. The results show that a big displacement of the side plate is produced because of the wind load, there is large stress at the main deck and the inner bottom deck due to the variable load and ballast water. After finishing the size optimization, the stress of hull increases and the stress is more evenly distributed, and the mass of hull is down. The utilization of material increases effectively.

Abstract: A new Phase-detecting device which can be used in real solid rocket motor (SRM) working environment was designed. By connecting this device up to an ablation experiment SRM, the impacted morphology of carbon layer surface was obtained and observed by SEM. Based on the demolishing pattern of the carbon layer surface, the real phase state of the carbon layer surface during SRM operation was also analyzed. The forming cause of this phase state and the mechanical capability of EPDM in real SRM environment were discussed briefly. Studies show that this new Phase-detecting device is a powerful tool for the research on insulator’s ablation theory and experiment, and the experimental results may provide a convictive evidence for ablation modeling.

Abstract: According to the mechanical characteristics of the body structure, the experimental model and the bending test of the body is constructed to understand the static characteristics of the body structure, laying the foundation for the sensitivity analysis and the modification of structural dynamics .

Abstract: The failure Prediction for thick wall CrMoV steel pipes circumferentially welded was studied using the Finite Element Method (FEM) under close-ended, open-ended and axial compression conditions, respectively. The life span of failure, redistribution of stress on the welds and damage variations were obtained using damage modeling. Since there is a distinct mismatch of mechanical properties in parent material, weld material and heat affect zone, variations of damage with time, stress redistribution and failure life in each zone are different. The FEM results show that the weakness of the welds is the heat-affected zone (HAZ) where the hoop stresses increase sharply in the tertiary stage of creep. The maximum of damage of the welds lies on the inner surface of in the weld zone when failure occurs. The information is useful for assessing the performance of practical service welds in power plants pipe work.

Abstract: This paper presents a new time-domain DQ (differential quadrature) method for structural vibration analysis. It adopts differential quadrature method both in space domain and in time domain on the basis of governing partial differential equation and initial-boundary value condition of vibration problems of structures, and gets new differential quadrature linear equations with complete initial-boundary value conditions for solving all parameters of the displacement-field. The examples in this paper show the time-domain differential quadrature method is a useful and efficient tool for structural vibration analysis.