Applied Mechanics and Materials Vols. 490-491

Abstract: The chemical precipitation method was combined with the membrane separation to treat the simulated radioactive wastewater containing strontium in the paper. The calcium carbonate powder was used to prepare the seed and the sodium carbonate was selected as the precipitant. Sr²⁺ and CO₃^2- constantly crystallized on the seed surface in the granulation reactor. FeCl₃ was dosed in the subsequent membrane separator. The average concentrations of strontium in the raw water and in the effluent were 5.046 mg/L and 0.028 mg/L, respectively. The DF increased gradually with the operation time, with an average value of 279. After the test, the formed precipitate was easy to separate from the liquid and was directly discharge after sedimentation for 24 h. The CF was 3170. The membrane specific flux decreased rapidly in the early stage and then declined slowly with the operation time.

Abstract: As for renewable energy, the distributed generation (DG) technology has a promising outlook and is getting more concern in worldwide. In order to ensure the distribution network operate on the best performance when accessed by DG, DG must have a good reactive support for the distribution network. In this paper, the models of different DGs reactive power external characteristics are given. And in the modified case of IEEE37, the SVSA program which is developed by Tianjin University are used to analyze the reactive support of different DG. The case study shows that under some certain control strategies and operation conditions, when properly making use of the reactive support, the distribution network has a better performance in power loss and also has a positive impact on the stability and economical operation. Compare with traditional reactive power compensation device, the DG performs better in overall network voltage and economical operation of network.

Abstract: In this paper, through research on the development of linear motor applications both at home and abroad, find out the linear motor application in the field of technology gap, in order to promote linear motor in the domestic promotion and use. Because the linear motor has its own unique advantages, in the mechanical and electrical integration of machinery and machine tool has been widely used, but in the numerical control machine tools, electric processing equipment, mining transportation equipment in areas such as yet there is a big gap, the performance of their products, the types, application field in a large number of blank or infancy. Only seize the opportunity of market demand, the development and application of linear motor and drive control technology on the market widely promotion, is bound to be in the driver with high efficiency, energy conservation and emissions reduction, promote industrial safety production from low-end to high-end equipment the development process of rapid ascension.

Abstract: In this study, effect of anisole additive into the diesel fuel on performance and emission parameters of diesel engines was investigated. Instead of structural changes which are more difficult and expensive, development of fuel technologies is preferred to provide reduction on exhaust gas emissions which are harmful to environment and human health. Therefore, in this experimental study, anisole was used as additive into diesel fuel with the volumetric ratio of 1,5%, 3% and 5%. The performance characteristics and exhaust emissions of a four cylinder, four stroke, naturally aspirated, water cooled, direct injection compression ignition engine fueled with modified fuels were analyzed. Engine was subjected constant speed, full load conditions during tests. Engine power, torque, specific fuel consumption, carbon monoxide, nitrogen oxide and carbon dioxide emissions were measured and results were evaluated. Changes in performance parameters were negligible for all ratios of modified fuels except specific fuel consumption. Finally, while carbon monoxide gas emissions were increased with anisole additive, carbon dioxide and nitrogen oxide gas emissions were decreased.

Abstract: The inertial force and torque produced by the crank-rod mechanism is an important factor of vibration in single-cylinder internal combustion engine. Based on MATLAB software, the analysis model of crank-connecting rod-piston mechanism of S195 diesel engine is established, and the dynamic characteristic parameters of the main parts can be obtained. The results showed that the simulation analysis can get the kinematic and dynamic data of the mechanism conveniently and accurately, which provides a feasible advanced method for the design and development of diesel engine.

Abstract: Input shaping is a feedforward control technique for improving the settling time and positioning accuracy, while minimizing residual vibrations. Shaped command profiles are generated by convolving a sequence of impulses. To design an input shaping controller, estimates of the system natural frequency and damping ratio are required. However, real systems cannot be modeled exactly, making the robustness to modeling errors an important consideration. Many robust input shapers have been developed, but robust shapers typically have longer durations that slow the system response. This creates a compromise between shaper robustness and rise time. This paper analyses the compromise between shaper duration and robustness for several robust input shapers

Abstract: The analysis of structure and performance of internal combustion engine is presented in this paper from the following two aspects: the thermal load of I. C. Engine and the thermal efficiency of diesel engines. Firstly, the thermal load of key parts of I. C. Engine as well as the evaluation parameters of which are introduced briefly. Furthermore, based on the factors influencing the heat transfer process of internal combustion engine, the current research situation of internal combustion engine work process and heat balance for combustion chamber components, and the whole engine using numerical simulation method is described, while the coupled study of internal combustion engine components is developing trends of internal combustion engine heat balance study in the future.

Abstract: With the increasing of machine tool feed speed, a large quantity of friction heat is generated on the ball screw system and will cause the temperature rising and thermal deformation along the ball screw that reduces the machining accuracy. The heat accumulated and dissipated are calculated to load to the established model of the Y feed system on a gantry machine tool. The stable temperature field at thermal equilibrium and the unstable temperature field before thermal equilibrium or with the variation of thermal load are gotten. From thermal structure analysis, the thermal deformation is derived. The FEM model is verified by the experiments carried out under the same condition with the simulation.

Abstract: This article took ISG Hybrid Electric Vehicle (HEV) as the target, studied its different engine starts under traditional control and μC/OS-II multitask real time operating system. Through the experimental comparisons in engine start strategy and control method, this study reached the conclusion that, the engine start process under μC/OS-II multitask real time operating system is more precise and smooth than that under the traditional control. In this way, multitask real time operating system can help reduce the fuel consumption and emission in engine start.

Abstract: In order to study operation characteristic of the hydraulic power steering (HPS) system, a data gathering system, based on the testbench, was designed to test HPS system operating on-road. By using various kinds of sensors, such as hydraulic pressure, fluid flow rate, steering torque, corner angle, angular velocity, vehicle speed, gyro sensors and so on, convert steering wheel angle, angular velocity, torque and other operation parameters into analog voltage signals, which provided to real-time data acquisition, storage and analysis. 11 physical quantities can be tested simultaneously, including steering system and operation parameters of vehicles. Different angular velocity of steering wheel speed and "S" shape road were tested on different vehicle speeds, and the result shows that the tests are in accordance with theoretical analysis, which proves the data gathering system's credibility.