Key Engineering Materials Vols. 467-469

Abstract: Precision fruits system is based on new tools and sources of information provided by modern technologies, such as the global positioning systems (GPS), remote sensing (RS), geographic information system (GIS) and variable-rate technologies. The modern technologies are integrated based on computer technology. The study introduced foreign and domestic situation of computer technology in precision fruits in detail. The key computer technology, such as the basic geographic databases and intelligent decision support system in precision fruits were analyzed, and the theory and practical application of spectral diagnosis of soil-leaf nutrient and online detecting model of microelement of fruits was emphasized in Suzhou city. The study shows that computer technology is one of the keys to establish high quality and efficiency, ecological, safety precision fruits farming techniques system of Suzhou city, and provides technical support for an increase in income of fruits farmer while decreasing in cost and pollution of fruits farming.

Abstract: The modeling of traveler’s daily travel behaviour is a complex problem. We propose a general activity-based traveler agent behaviour model for microscopic traffic flow simulation, inspired by the ideas of activity-based traffic demand model, hierarchical structure in behaviours, agent approach and subjective utility optimization method. In the case study, the general model was applied to an unsignalized intersection mixed traffic flow simulation model, and the validation results were promising.

Abstract: Combining with some research achievements in remote control of robot at home and abroad, this paper analyzes general principle of it and designs a remote control system for robot. The system can be realized through network, and it utilizes browser/server mode and applies CGI program which is written in VB. Through the CGI program, the communication between server and browser is realized. Not only does the design describe the control process, but also it defines a scheme of the remote control system which determines integrated structure. Besides, a user interface which includes user permissions and function modules is developed. Finally, a preliminary control test for system is taken and the performance of the system is analyzed.

Abstract: Wood drying is a complicated non-linear process that is lagged,time-variable and coupling. For them,it is difficult to build up ideal drying model,which is corresponding to reality.The paper put forward the drying method of vacuum dehumidification.This drying method is based on neural network and expert system. The test results showed that the control method were better than traditional PID control.The control system could meet requirement of precision and a fast convergence and small overshoot.

Abstract: The extended end-plate connections widely used in steel frames, at home and abroad，many countries have given varieties of different methods to determine end-plate thickness. This paper, uses the plastic theory to analyze the end-plate thickness of the figure 7.2.9a in CECS 102：2002 specification, adopts small deformations of geometric relations and the equal principle of work both inside and outside, the prying force issue is considered according to whether deformation bolts do work, and finally discuss the design process of the end-plate thickness. Contrasting present norms, this method can significantly reduce end-plate thickness.

Abstract: Modern power system has been gradually developed into a complex system with the features of multi-level structure, multi-time scale, a variety of control parameters, wide-area, open, uncertainties, non-autonomous and it is difficult to indicate the security level of power system by a single index. Therefore, power system security assessment based on theory of comprehensive assessment is developed rapidly in recent years. However, traditional comprehensive assessment method considers few about the balance of the indices, when there are great differences between the value of the indices, it is easy to take place the phenomenon that the small indices has been “submerged”, which will influence the rationality of the comprehensive evaluation result. In this paper, a comprehensive assessment model which considers the influence of the index balance is established. By introducing the balance coefficient, the model can amend the original judgment matrix and the weight obtained by traditional AHP method. Since the coordinated and balanced situation of the indices have been reflected in the evaluation process, the results of the assessment model proposed in this paper has more scientific nature and more credibility. Finally, an example is provided to validate the model in this paper.

Abstract: The measurement of engine cylinder joint surface holes is directly related to the control of product quality and the follow-up assembly. CMM is widely used in this field but can not meet the inspection requirements of automation, rapidity and Online testing. In this paper, a new measurement scheme based on the combination of multi-vision sensors is proposed. The global calibration method is focused on and a new dedicated calibration target is designed. The whole process of the system global calibration can be accomplished quickly through single imaging. The experiment results show that the method is feasible and with high precision. The method mentioned above can satisfy the engine production line requirements of intelligence, rapidity, high precision and low cost.

Abstract: The amount of the dissolved oxygen in the water is an important index for the fishery breeding. This design is intended to avoid the negligence in fishery breeding because farmers failed to increase the oxygen to the pond, which led to the death of fish, also discussed the influence of algae water pollution, temperature and water depth on the determination. The design using acidic gel electrolyte original battery coated in oxygen sensors as oxygen sensor，AT89S52 SCM system as the oxygen determination and control system, SCM control relay to control the opened and closed of aerator. To improve the accuracy of oxygen collection, this design uses three oxygen sensor at different positions turns sequential sampling in the pond, by the A/D converter into SCM and corresponding control signal. If the average value of oxygen content in the pool below the lowest oxygen resistance of fish aerator would be opened, to ensure the lowest oxygen content so that fish will avoid death. Avoid the economic losses caused by the fish death as farmers fail to open aerator timely, that because of the low oxygen content cause by the sudden changes of light, temperature, pressure and so on. At the same time the design will always show the oxygen content at all times, so that oxygen contents can be adjusted according to the numerical value in the pond, to achieve optimal oxygen content and improve the standard of fish feed conversion rate and growth rate.

Abstract: Traditional methods such as scoring method, Likert scale method, etc, suffer from uncertainness, randomness and inaccuracy. To solve these problems, a cloud model is presented in this paper. Based on fuzzy mathematics and statistics, the cloud model can convert the qualitative evaluation of the product to quantitative scores. It’s a better way to overcome the disadvantages of direct scoring method that cause more inaccuracies. A prouct satisfaction evaluation model with three dimensions (i.e., evaluation index, product sets and estimator) is then constructed, which combines the cloud model and the grey relational analysis. Finally, the effectivity of the presented model is demonstrated by a case study.

Abstract: A geomagnetic dynamic simulator was designed, and attitude simulation application method was proposed. Three pairs of square Helmholtz coil system was designed, and the geomagnetic field was cancelled by DC current, forming a zero magnetic field space and generating controlled size and direction magnetic field. Three DC current sources were adopted to produce the current for canceling geomagnetic field and the desired magnetic field. The geomagnetic field was offset without three DC power, the premise of saving cost and ensure the accuracy. As the magnetometer accuracy and dynamic capability does not take into account two indicators, so calibration mode, select high-precision magnetometer, or for remanence measurements. The selection of simulation in the dynamic simulation using magnetometers can meet the small satellite in orbit simulation requirements.