Applied Mechanics and Materials Vols. 26-28

Abstract: Deep drawing is one of the most widely used metal forming process to produce sheet metal parts especially in automobile industries. Warm working is the plastic deformation of metal at temperatures below the temperature range for recrystallization and above the room temperature. In this investigation, 1.0mm thick circular specimen of stainless steel AISI 304 were warm deep drawn and the influence of temperature on the deformation behaviour of material and the drawing loads which is required to draw the component was studied. The results show that the warm working has positive effects like reduced drawing load, negligible amount of increase in thinning and thickening of a drawn component when compared to the conventional drawing and also there is no necking or cracking occurs due to the temperature influence.

Abstract: In a hermetic model building, when there is a signal of fire alarm, the robot will start and send out alarm constantly. It will find the fire place and extinguish the fire. Then, the robot will get back to the start point in the shortest time. In this paper, the robots and the competition strategy has been introduced. At the same time, this paper emphasizes the sensor and the editing process of the software. According to the rules of the international fire extinguishing match and the limitation of the competition area, arithmetic along the wall and the appropriate situation analysis should be used to detect the environment and drive the motor to make the robot find and put out the fire according to the proposed scheme. Experimental results show that it is practicable that robots can successfully find out the fire sources with the approach and the technology of avoiding the obstacle by infrared detection. Better performance of searching the room and extinguishing the fire quickly has been achieved.

Abstract: A high Computational Complexity of welding deformation Simulation for large hydraulic excavator is visible. Similitude theory is a better way to solve the problem. When neglecting the energy change caused by elastic and plastic deformation, and supposing the geometry similitude of plastic deformation zone, and having the same stress for the plastic deformation zone of the same materials, similar rules of the single-pass welding based on temperature field had been deduced. But we don’t know whether they are effectual for the multi-layer-pass welding. For validating it, a numerical simulation was carried out through simulating the welding process of large hydraulic excavator’s swing arm. And we got the better results. The similar rules deduced on the single-pass welding are also applicable for multi-layer-pass welding under the conditions of the same weld numbers and the same welding sequence.

Abstract: A new type and high efficiency adsorbent was prepared with powder activated carbon and polyurethane vesicant and surfactant, which being used to adsorb humic acid (HA) in boiler feedwater. The batch adsorption experiments were carrid at different pH value, different adsorbent dosage and different initial concentration to investigate HA removal rate and adsorption capacity by as-produced adsorbent. Their adsorption kinetics experiments data was fitted with pseudo-second-order rate model, its quation was 1/qt=0.094+5.51/t, and equilibrium adsorption capacity obtained from fitting curve was 10.6mg/g, consistent with the experimental results(11.5mg/g).The adsorption isotherm test was carried at 25°C-50°C, the equilibrium adsorption capacity was 10.9mg/g by Langmuir model, which being similar with experiment results, the free energy (ΔG), enthalpy(ΔH) and entropy (ΔS) were obtanined with Clapeyron-Clausius and Gibbs-Helmholtz equation in the adsorption isotherm, which all were negative, indicated that HA adsorbed by as-produced adsorbent was an exothermic process of entropy reduction.

Abstract: This paper describes the basic theory of SOA architecture and the related technologies to achieve SOA, presents a simplified information system architecture design based on SOA architecture, one by one analyzes the function of each layer, and in detail designs the object-oriented layer, SOA service bus, finally analyzes the SOA application in enterprise information management systems and its prospect.

Abstract: Since complex industry object has characteristic of non-linearity, uncertainty and time-change, this paper studied about application of self-regulation PID-Fuzzy controller for flume system. The properties of the basic fuzzy controllers can be improved through compiling S-function and subsystem that automatically corrects the quantizing factors Ke and Kc. The proportional, integral and derivative constant adjusted by new rule of fuzzy to adapt with the extreme condition of process. Fuzzy control applies language rule to describe controlling process and bases rule to modify the controlling arithmetic and parameter. The new algorithm performs in every condition and already tested in every extreme condition. The simulation result shows that the controller possesses virtues of self-adaptability and short adjusting time. It will realize production process control.

Abstract: Plybamboo is commonly made using chordwise bamboo strips. Previous studies have indicated that the bamboo utilization rate and the processing efficiency are low in manufacturing chordwise curtain Plybamboo. This paper presents a study on the manufacturing technology of radial curtain plybamboo form. Radial strips cut from bamboo were glued on the radial faces. The results showed: (1) the bamboo utilization rate of radial cutting strips was 15-20% higher than chordwise cutting strips, and the resin consumption was only approximately 50% of chordwise bamboo strips; (2) however, radial bamboo strips were more subject to lengthwise bending deformation than chordwise strips during drying. This lengthwise bending deformation can be effectively reduced or prevented by placing a hollow rigidity axle in the radial bamboo curtain rolls when using the bound drying method; (3) the hot pressing time of the radial curtain plybamboo form was approximately 50% of the chordwise composite plastic curtain plybamboo.

Abstract: As one of typical multilevel fuzzy comprehensive evaluation, the key step for the evaluation of operation quality of urban taxi transportation system is to converse a series of membership degrees from membership degrees of bottom indexes. However, the existing converse algorithms of membership degrees are questionable because of redundant data of membership degrees of indexes, which are useless to objective classification, are involved in calculation of it of the objectives. Therefore, in order to classify the objects properly, a filtering algorithm, which can filter redundant data firstly in membership degrees of indexes that are useless for objective classification, is proposed to extract the valid values to converse membership degrees. Without the redundant data, a general algorithm for conversing membership degrees is given to evaluate the operation quality of urban taxi transportation system.

Abstract: Due to the shortage of complete design material and mature manufacturing method, less teeth gear (1-7 teeth) transmission has many restrictions in practice nowadays. In this paper, applying the principles of using rack cutter to cut involute gear by using generating methods, we established the dynamic coordinate system and the static coordinate system. By using coordinate transformation method, we derived the equations of gear profile involute and dedendum transition curve. After using Pro/E to plot the end profile of less-teeth gears, we did the 3D modeling and the simulation of the less teeth gear. We also improved a general hobber machine and manufactured less teeth gears successfully. The derivation method of gear profile curve in this paper has lucid concepts which make it quite clear and easy to understand, therefore, it provides theoretical basis to the design, the manufacturing and detection of the less teeth gear.

Abstract: Because of the lack of research, there is no mature design method for less-teeth gear transmission nowadays. In this paper, based on the features of less-teeth gear transmission, we presented the five main limitations of the modification coefficient for less-teeth gear and its relevant equations. By using these equations, taking z1=4, z2=54 as an example, we plot the closed graph for the modification coefficient on computer, and then analyzed it. By using this method, we can plot the closed graph of modification coefficient for any transmission ratios. Determining the modification coefficient according to its closed graph is not only quite easy to understand, but also more reasonable.