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In order to predict the performance of a manufacturing process or system, proper mathematical models are needed. This research investigates the use of two competitive unsupervised data mining methods - regression and neural networks - in developing an empirical model for two electronics fabrication processes/systems. A case study from experimental data of electronics fabrication is used to demonstrate...
Based on the problem-solving strategy of MAS and the correlation among questions, this paper puts forward a kind of domain knowledge engine - DKE, which is grounded on a knowledge inference algorithm based on interesting degree. With the help of DKE, the process of knowledge acquisition and maintenance is done easily and conveniently by the experts without programming, the certification of knowledge...
Aiming at fermenter temperature control, a novel control scheme based on least squares support vector machine (LSSVM) and model predictive control (MPC) is proposed. Existent PID control doesn't consider the model of controlled object, so it tends to bring steady-state error. So the proposed method utilizes LSSVM to obtain fermenter temperature's model and then uses it to implement MPC. The simulation...
In order to solve the difficulty of dredging drainage pipelines, intensity of labor and other problems, a new type of drainage pipelines dredging robot was developed. The status quo and several ways of cleaning drainage pipelines at home and abroad and walking mechanism of the robot were analyzed. According to the operating environment and the technical requirements, and based on the modular thinking,...
Interference between the rules is an important index of the static features of a fuzzy controller. The traditional calculation of the interference density is based on fuzzy mathematics, which is not easy to put it into use because of its intricacy. The feasibility of calculating interference density by relative Euclidean distance is discussed with the help of tests in the article. The tests show that...
Plug-in Hybrid Electric Vehicles (PHEV) are now regarded as one of the most promising ways to reduce automobile contributions to petroleum dependency, air pollution, and exhaust emissions. Energy management strategy plays a key role in PHEV. In this paper, the design prototype of the series-parallel hybrid electric vehicle with Dual Clutch Transmission (DCT) is proposed, and the dynamic performance...
The fluctuations of process parameters and groove dimensions would lead to the change of weld penetration state in the thin-walled cylinder girth weld, the penetration state was need to detect and control real-time in order to ensure stable penetration. A vision-based direct sensing method was established for thin-walled cylinder TIG weld, the clear back pool image was got, the wide range back melt...
In this paper, the PCA-PSOBP neural network has been put forward to model ultrafiltration of printing and dyeing wastewater. Firstly, Principal Component Analysis (PCA) was applied to reduce the dimensions and correlations of input parameters. Secondly, the PSOBP was used to optimize the weights and thresholds of the neural networks, in which weights of BP neural network were adjusted by particle...
Take the general kind of mold's processing for example, the paper analyzes the mold machining process and workpiece characteristics. Base on the mathematical model of job shop scheduling system, the paper establishs the production unit allocation method, utilizes the robustness of Genetic Algorithm, proposes the idea of job-shop scheduling algorithm. Especially, the paper gives the detail design and...
Weather forecasting is complicated system engineering. History meteorological data play importance role in weather forecasting. This paper proposes a solution to design and construct history meteorological data multi-dimension analysis system based on dimension modeling technique. It discusses the implementation of meteorological fact constellations, which provides an effective solution for history...
A mathematical model for mass, momentum and heat transfer based on two-fluid flow theory is proposed. The model was applied to the drying process of wet alumina particles in a vertical pneumatic dryer. The model was based on the one-dimensional balance equations for mass, momentum and energy of the gas and dispersed phase, taking into account variations of properties with humidity as well as temperature...
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