Applied Mechanics and Materials Vols. 719-720

Abstract: In reconstruction works on historical buildings, considerable expenses are spent. Therefore, it is desirable to assess durability of applied materials in the particular conditions of a specific building. This cannot be done effectively without the knowledge of their basic physical and hygric properties, which give information on materials performance within their exposure to harmful climatic conditions. In this paper, experimental analysis of five types of sandstone originally used over the Czech territory for historical buildings, monuments and ornamental parts of architecture, is presented. On the basis of obtained results, the materials behavior at real service conditions can be assessed, which is necessary information for their practical usage.

Abstract: Municipal solid waste incineration (MSWI) fly ash was successfully used as a main raw material in sintering and preparing calcium sulphoaluminate (CSA) cement in laboratory. This work focused on effects of cement additives of MSWI fly ash, lime powder (LI), fly ash (FA), and slag powder (SL) on the durability of CSA cement-based materials. Compared with the hardened cement containing 10% MSWI fly ash alone, compressive strengths of samples containing 20% combined additives was improved significantly. When 20% combined additives were added the resistance to shrinkage, carbonation and sulfate attack was strengthened while the combined additives had negative effects on the resistance to water permeability.

Abstract: Two kinds of multiple-pulse were reported on atmospheric plasma jet (APPJ) of dielectric barrier discharge (DBD) configurations in this study. Meanwhile, the investigation on electrical characteristics of APPJ in helium and helium/air was carried out with the aim of shedding light on the electrode parameters for dissipated power and jet length. The typical bacteria, E. coil, were employed to study the effect by the two APPJ devices (PJ-1 and PJ-2). For PJ-1, multiple-pulse appears in both sides of every half-cycle, but only in the positive half-cycle for PJ-2. A wider power electrode of PJ-1 and further distance from the nozzle to grounding electrode of PJ-2, whether in ambient helium or helium/air, are all conducive to improvement of dissipated power. With the increase of gas flow rate, the jet length will become longer at laminar flow mode, then get shorter, and a permanent to the end. Generally, the introduction of air leads a better sterilization effect, especially for PJ-1. Keywords: Atmospheric Pressure, multiple-pulse, Electrode parameters, dissipated power, jet length, plasma jet. PACS: 52.80.-s, 52.77.-j

Abstract: It will vibrate when the natural frequency close to the external exciting force during the operation of the motor, accurate and effective calculation of the natural frequency of the motor has an important significance to damping noise. The inherent frequencies of the motor were got by numerical simulation model and the ANSYS finite element modal analysis, and comparison results verify the effectiveness of the motor model. The effect of the foot length change to the inherent frequency was researched emphasis, and puts forward related suggestions.

Abstract: Working in the corrosive environment for a long time, it is easy for metal pipes to produce stress corrosion cracks which will affect the use. An infrared detection method combining permeate treatment with heat-incentive steam is proposed to detect surface cracks, which then has been verified by simulations and experiments. For the simulation, pipe model including four cracks of different depth and width was constructed by ANSYS. Transient thermal analysis was made after convection incentive loaded on internal and external wall in the case of whether or not undergo surface infiltration processing. For the experiment, pipe including cracks were made the same as simulation parameters, then experiments were made using the thermal excitation system in two cases. Surface temperature distributions of the pipe were compared in two cases, the results of the study show that penetration treatment before heat incentive can significantly improve the surface crack detection sensitivity.

Abstract: To make diesel engine Exhaust meet Euro V standard , the most efficient way was to use SCR(Selective Catalytic Reduction).In this paper ,the composition of the urea-SCR system, essential parts and technology of urea-SCR and the strategy to reduce NO_x exhaust was analyzed carefully. And through the test analysis, Selective catalytic reduction technical could Euro V diesel engine emission standard had confirmed.

Abstract: A kind of special energy aggregation structure is analyzed. The special structure can gather electromagnetic energy. The paper summarizes features of the structure and indicates that the structure is a fractal. By analyzing the fractal characteristics, deduces the math iterative that can produce the parameter matrix of the structure. Mathematical model is done for this special energy aggregation structure. A special energy aggregation structure is designed by the mathematical model. The experimental results proved that the sample has functions of gathering electromagnetic energy. The results prove that the mathematical model for the special energy aggregation structure is built correctly and effectively. The paper provides the basis of mathematical analysis for researching on energy aggregation and transmission mechanism of this structure.

Abstract: In order to start performance testing and experimental research for enclosure of airplanes’ fuel systems, a type of integrative testing system is designed in this paper. This system can accomplish function and performance tests for enclosures in airplanes’ fuel system, and also can execute troubleshooting experiments.

Abstract: Taking roller coaster as the research object, select segmentation fitting to get the curve equation of the track based on the discrete points on the track, use Solidworks and Eon Studio to make model and simulation. Providing a reference for the modeling and simulation of reptile rides by studying track modeling and motion simulation of roller coaster.

Abstract: A stability estimation approach is proposed to support complementary stability criterion design in vehicle planar motion. The comprehensive effect of tangential force and axle load transfer on tire cornering characteristics is considered corresponding to the longitudinal dynamics effects. The effectiveness of different stability concept is discussed in terms of the physical meaning of state variables in 3DOF differential systems. Based on the sense of technical stability, the 3DOF model is simplified according to longitudinal dynamics characteristic within definite observation time interval. The central equilibrium points continuum properties of the simplified model can be used to estimate the vehicle behavior in planar motion.