Papers by Keyword: Experiment Design

Abstract: The fatigue cracks are inevitably existed in steel bridges after they are working for a fairly short time because of the environmental pollution, overloading vehicles and larger numbers of automobiles. Due to the fact that the scholars have put few emphases on the influence of corrosive environment which inevitably affects the fatigue property of steel bridge, an experiment design of corrosive and fatigue property of steel box girder with the specific environment controlling equipment is taken into account. Through the data from the experiment design, the important residual strain can be gained, which can be used for the analysis of the damage developing regularity.

Abstract: A double pivot suspension used for in-wheel motor electric vehicle was designed, and the virtual prototype model of the suspension assembly was build. The suspension parameters changed greatly during steering. In order to solve this problem, this paper proposed a non-linear response surface model to fit the relationship of suspension parameters and design variables. An optimization scheme was designed based on the response surface model. The suspension performance was improved significantly using optimized variables.

Abstract: The core component -----a set of coaxial densely winded degaussing loops of a magnetism-concealed tank is designed and made by experiment method. From the data, it can be concluded that the coaxial densely winded degaussing loops can eliminate the tanks magnetic field signs which are engendered by magnetization in the earth magnetic field, specially, the demagnetizing effect near the axis is more obvious. It should be paid attention to the direction of the demagnetizing electric current in experimentation, another important factor to get optimal demagnetizing effect is to seize the right time of demagnetizing electric current. If a demagnetizing electric current is kept too long, as can be seen from the table, the tanks magnetic field signs will be strengthened owing to the counter-rotational magnetization, which accords with the electromagnetic theories. In addition, the degaussing loops work characteristics are given in our auxiliary experiment. In conclusion this experiment design method provides a sustain for magnetism protection theory of equips, and a train of thought is offered for both the magnetism-concealed tanks designing and researching through the experiment process.

Abstract: In order to satisfy the requirements of light weight and high stiffness for NC isothermal hydraulic press, a method of lightweight design for lower beam is proposed. Key geometric parameters of lower beam affecting mass and stiffness are extracted as design variables. Latin hypercube sampling is used to produce samples of design variables in order to explore relationship between stiffness, mass and design variables. Calculating data are processed with second order stepwise regression and regression equations for stiffness and mass are obtained. Mathematical model for lightweight design is established by regression equations. The goal of lightweight design is to decrease mass of lower beam while stiffness is set as constraint. When lightweight design is finished, the mass of lower beam is decreased by 11% and its stiffness remains unchanged.

Abstract: Passenger can be caused serious injury in vehicle side pole impact. Through China In-Depth Accident study (CIDAS) ,We extract some important parameters and carry on targeted research in side pole impact accident. Accident data show that: The method with vehicle lateral strike a diameter of 200mm ~ 300mm pole in the direction of 8 ~ 11 points and in the speed of less than 40km/h is in accordance with the Chinese actual accident situation. Research results show that: The important parameters of pole diameter, impact velocity, impact angle and impact point position within the CIDAS data range, The collision velocity has large effect on body structure, the collision point position and pole diameter has very little effect.The results are helpful for us to further understand the special side impact form.

Abstract: The efficiency of continuous reconnaissance of UAV formation will be changed with the number of UAVs, the detectability of UAV and target strength. The crossing line method is used to evaluate the efficiency of continuous reconnaissance of UAV formation. In this paper, the reconnaissance system of UAV formation in multi-target situation is analyzed using the method of Agent Based Modeling and Simulation (ABMS); and then the influence of the number of UAV, the detectability of UAV and target strength on reconnaissance effectiveness is also analyzed. Simulation results show that the number of UAVs and the detectability of UAV have a significant influence on the capability of continuous reconnaissance.

Abstract: In the process of the routine exploitation of naval gas turbine the most important, for the exploiter, is the nature of the cooperation between the engine and its power receiver. In particular, if it is a controllable pitch propeller. Due to the fact that ship's documentation does not often contain that type of characterization, there was an attempt to its designation. Given the preliminary nature of the research, it was decided to perform them on gas turbine engine GTD-350. Appointment of a mathematical model of the above characteristics is a complex issue, requiring the application of the theory of planning experiments. The article demonstrates how to implement the preliminary tests and their results, the results of statistical analysis and substantive research results obtained and formulated on the basis of their conclusions.

Abstract: This paper first analyze the common air source heat pump defrosting control methods and their problems. Then, the impact of variable refrigerant flow technique on the air source heat pump frosting and defrosting is analyzed. Through experiment design, the influencing factors on inverter air source heat pump defrosting control methods will be studied.

Abstract: In the present study, the waste scrap agate, obtained as a by-product of rock agate beneficiation as decorating ends and media for wet grinding was used as inert filler in a traditional triaxial red stoneware tiles composition. The effects on the technological properties have been investigated. The study has been carried out using the mixtures experiments method for the experimental design. Characterization results were used to calculate statistically significant and valid regression equations, relating dried and fired body properties with clay, feldspar and scrap agate contents in the unfired mixture. The regression models were then used simultaneously to delimit the combinations of those three raw materials most adequate to produce a ceramic body with specified properties. The use of mathematical optimisation shown that, for the particular raw materials under consideration, there is a rather forgiving composition range of clay (20-68 wt.%), feldspar (17-50 wt.%) and scrap agate (15-45 wt.%) contents within which it is possible to simultaneously specify the technological requirements for triaxial red stoneware tiles bodies, not only of the fired products but also of the intermediate materials at important stages of the processing.

Abstract: The simultaneous effect of raw materials (A, B and C) on physical and technological properties of brick compositions was studied. This investigation was carried out using the statistical design of mixture experiments. Ten mixtures of three raw materials were selected and used in the experiments design. Those mixtures were processed under conditions similar to those found in the ceramics industry. Fired body characterisation results were then used to iteratively calculate statistically significant and valid regression equations (trace plots), relating linear firing shrinkage, open porosity, fired bending strength and water absorption with the proportions of raw materials. The microstructures of some selected samples were studied using scanning electron microscopy. Mixtures with high clay B contents were most adequate to produce, under constant processing conditions, a brick with specified properties. The microstructures are characterized by a low closed porosity and absence of vitreous phase.