Papers by Keyword: Engineering Optimization

Abstract: Through testing the operation of solar energy-water source heat pump hot water system, analysis of the factors that affect system performance, research engineering optimization strategies for improving systems performance. Given some optimization recommendations for both solar energy system and water source heat pump system. Provide some supports for this new technology which use renewable energy in the future development.

Abstract: The LS-SVM(the least square supporting vector machine) model of tar removal process by catalytic cracking in corn straw gasification was established according to the experimental data in [2]. On this base, a multi-objective optimization function was put forward, by which the Pareto-optimal solutions were gained in a single run. From the perspective of engineering optimization, the efficient solutions that are suitable for power generation and gas supply were selected respectively from the Pareto-optimal solutions by analysising different demands for gas.

Abstract: The ideal performance of a small engine requires changeable intake pipeline volume while engine speed varies, as been recognized in former study. However, an intake pipeline with changeable volume is tremendously difficult to achieve. This paper presents an innovative three-pipeline model by experimental design optimization to simulate a simple changeable volume pipeline. The primary goals contain the promotion of lower-speed torque, the fuel consumption; emissions of CO and HC are expected to reduce simultaneously. The optimum diameters, lengths of three pipelines, and the proper timing of switching three valves among lower speed pipe and higher speed pipe can be obtained by proposed integration method

Abstract: This paper proposes a novel multiobjective genetic algorithm (MOGA), Evaluated Preference Genetic Algorithm (EPGA), for efficiently solving engineering multiobjective optimization problems. EPGA utilizes a preferred objective vector to perform a fast multiobjective ranking schema within a low computation complexity O(MNlogN) where N is the size of genetic population and M is the number of objectives. For verifying the proposed algorithms, this paper studies two engineering problems in which multiple mutual-conflicted objectives should be considered. According to the experimental results, the proposed EPGA can efficiently explore the Pareto front and provide very good solution capabilities for the engineering optimization problems.

Abstract: This paper develops an intake two-pipeline model on a 125 cc single engine including the effects of engine torque (T), fuel consumption (FC) and both CO and HC emission. Those four performances in prescribed speed range were constructed by the response surface method. The formal design of experiment has been utilized to examine the significances and characteristics of interrelated parameters. A proposed engineering design optimization simultaneously treats four performances with weighting strategy so that the optimum two-pipeline diameters, lengths, and the appropriate timing of switching low-speed pipe to high-speed pipe can be obtained. The presented integration process of experimental design optimization offers an applicable process and technique for small engine and can apply to other mechanical product development.

Abstract: Recently, a new drilling technology has been attracting attention using a super-high-speed spindle and micro diameter drills (less than 0.2 mm). In these drilling conditions, B-RING damage extends more than internal damage around the drilled holes. Therefore, we investigated the best drilling conditions for control of the B-RING, considering productivity. The following conclusions were obtained. (1) The temperature of the drilling tool is raised by decreasing the heat capacity of the drill. B-RING damage around the drilled hole is especially generated under drilling conditions using the super-high-speed spindle and micro diameter drill. (2) B-RING is mainly caused by the heat being conducted to the hole wall of the PWB. (3) Raising the R point height is an effective method for preventing B-RING damage. (4) We confirm obtaining the best drilling condition by considering B-RING and productivity.