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Mathematical modeling represents an efficient method allowing us to examine properties of a researched object. This article will present the design of an analytic model of a jet engine (MPM-20 engine in particular) that will be used to set the operational envelope of the engine for further use in a control system that will be limited by this envelope.
We present a MEMS-based contactless gripper with arrayed spiral air flows, aimed at the mitigation of the flow-induced vibration of the levitated object. For non-contact levitation as applied to the robot end-effector, the air flow-based handling system has attracted increasing attention due to the simplicity of the structure and its control. Our design is based on the concept of distributed forcing...
In this paper the operation of a recently introduced novel version of the popular “Model Reference Adaptive Controller (MRAC)” is compared with that of a simple version of its possible traditional implementations. The “traditional implementations” normally use Lyapunov's 2nd (“direct”) method for adaptive tuning of the controllers' parameters. This method yields global asymptotic stability but its...
The trust management mechanism based on seller coalition and consumer virtual community is discussed in this paper, which is verified valid by game theory. The seller tends to carry out an honest transaction because of the increased opportunity cost in the mechanism, and consumers feedback transaction information positively because of the identity of community and the pursuit of interests, which makes...
In order to optimize the capacity of farmers' income persistently increasing, in this paper we analyze 8 factors affecting farmers' income increasing using PLS model based on the statistical data of Heilongjiang reclamation from 2000 to 2008. The study shows that wage incomes, agricultural subsidy and tax reducing still account for a great proportion of farmers' net incomes, but the level of agricultural...
In this paper, a research model of the impact of family business culture dimensions on control modes is built, based on the theory of cultural and on the main structure of the impact of family culture on control mode, combined with the reality of control mode of Chinese domestic business. What's more, the paper proposes a detailed analysis of how the family cultural dimensions affect the control mode,...
Drugs circulation channels are not only related to the drug industry development, but also the human health and safety, therefore, the implementation of government supervision on drug circulation channel is one of the key content of the social and economic regulation. This paper established a basic model of drug circulation channel of government supervision, and tried to seek and explore a more effective...
The decreasing birth rate and the rising popularity of overseas studies have combined to drag the number of candidates for college entrance exam. Besides these two reasons, the disturbance of population happened 51 years ago may cause the decrease in number of college entrance exam candidates in the future. We constructed a nonlinear regression model to analyze the impact of disturbance of population...
This work describes a novel modeling and simulation approach of brushless DC motor control system depended on analysis of it's mathematical model. The brushless DC motor ontology model, the voltage type inverter circuit model, the hysteresis current tracking comparative model and the PID speed controller model were constructed in the Simulink environment of Matlab. S-function was used in modeling...
Hydration parameters adopt in numerical analysis of temperature and stress of mass concrete are different between hydraulic engineering and building construction engineering. The affection of the hydration parameters, such as quantity of hydration heat, hydration rate and the hear transfer coefficient between concrete and air surface, to the temperature of the mass concrete are investigated. Some...
Rational assignment of passenger flow between parallel railway lines is a base of optimizing transport organization for high-speed railway and the existing railway. Firstly, this paper analyzed the influencing factors of passenger travel choice behavior and set up a generalized cost function, then used the generalized cost function to replace utility function of Logit model. An improved Logit model...
Based on the behavioral theory of corporate finance perspective, this article takes the listed companies in 2008 as a sample, researched the equity financing preference on investment behavior. By regression analysis: the listed companies' equity financing preference and the financing size have significant influence on the investment behavior.
This paper investigates the influence of soil-structure interaction (SSI) on seismic responses of long-span space truss roof. First, a three-dimensional (3D) integral finite element (FE) model of a typical regular pyramids space truss structure consisting of space truss roof and support columns is developed. By applying FE method for near field soil and infinite element (IE) method for far field unbounded...
The serial design theory was used to analyze and calculate the main components of sheet metal forming hydraulic machine,identify the key parameters of its component parts, establish the size parameter library of the structural characteristics of the parts and modularization thought was adopted to research parametric CAD intelligence design system of sheet metal forming hydraulic machine. By inputing...
This article describes a modeling method of the involute bevel gear, by using a modeling function of a UG software. It is included, the creation of the equational expression of the gear outline involute at the unfurling plane of the bevel gear, the formation of the section drawing of the large diameter area and the groove of the small diameter, the creation of the gear ingot and groove,the modeling...
Combined with engineering example, this paper utilizes the Monte Carlo method in network planning, calculates the probability of project completion or completion risk for specific planned construction period.
BIM is a detailed expression about information of projects which is based on 3D digital technology and integrates all kinds of visualization digital architectural models of relevant information in construciton project. At the same time, it supplys scientific cooperation platform about "simulation and analysis" for designer, architect, engineer, developer and end user, and helps them utilize...
The one-dimensional consolidation of soft soil induced by water head difference between the top and the bottom of the soil layer was studied. One-dimensional consolidation equation expressed by water head under arbitrary datum plane was derived, and the general solution was obtained for arbitrary decline model of water table. Furthermore, for two simple models which are linear decline model and instant...
In allusion to China's urgent need for predictive control of the air traffic flow, this paper mainly introduce the research status and the development process of the air traffic flow model through studying the research history and various existing models. It also introduce and analysis five kinds of the mainstream models. Through analysis and comparison, it can be found that each model has its own...
The relationship between entrepreneurial capability and enterprise growth is analyzed in the paper. Although the impact of learning capability and innovation capability of entrepreneur on the enterprise growth is emphasized in the existing researches, but this paper analyze the topic in the context of China, and the result shows that strategic capability, management capability and relationship capability...
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