In view of the characteristics of China's nonferrous mines, the paper proposes the basic thinking on the development of science and technology and the hierarchically developing objective, describes briefly the proposed main research fields, and puts forward several key research topics.
“Engineering” has different meanings in different course realm while the engineering concept can be comprehended from different aspects. However, engineering and engineering management have the particular scientific content in engineering management science. Based on the present situation of engineering and .engineering management both domestic and abroad, the author put forward the definition of engineering and engineering management. The characteristics of engineering management and engineering management branch are analyzed.
In this paper the design and realization of the rotary inverted pendulum (RIP) control system is presented. After analyzing its dynamic characteristics, the system model based on Lagrange method is devised. In addition, linear quadratic regulator (LQR) is designed and implemented on the RIP system by successfully balancing the pendulum in the inverted position. Simulation and experimental results are presented to show the stable and robust responses of the control system.
Based on comprehensive discussion on the connotation of generalized uncertainty systems theory, this paper discusses the extension of generalized uncertainty systems theory as well as the basic frame and principle of correlation theory. It is a base to study generalized uncertainty systems theory.
Cruise missile achieves good flight performance by means of stabilization and regulation of its attitudes. Based on analysis of the perturbation model of missile*s dynamic characteristics, series control structures are constructed for attitude control loop, and their discrete models are served as controlled plant for recursive least square (RLS) based adaptive predictive control, thus the mass center control with slow response transforms into trajectory angle control with fast response and high precision. On the basis of missile’s characteristics, generalized predictive control (GPC) is used in inner attitude loop, and an integral form of predictive control is adopted in outter trajectory loop. Effective transformation from mass center command to trajectory reference has achieved to realize high precision tracking. This method realizes the integration of attitude reference signal with guidance command, and that of attitude control with mass center control. It can reduce precision requirements on aerodynamic data and the control parameters can be easily selected. The numerical simulations demonstrate its effectiveness. Finally, some further academic directions are presented.
Demolishing of frame building by blast is complex and difficult. Based on mechanics process of demolishing blast of frame building, the numerical compute model on breaking of the frame building is set up in the paper. By this numerical compute way, the design projects of demolishing blasting of the frame can be simulated and the design parameters can be optimized. Through the simulation, the wastes of boreholes, explosive charges and safety protection material can be avoided. Sometimes the frame building does not collapse in the process of the demolishing blasting because the design project is not correct by experience. The situation of every member of the frame in the demolishing blasting can be computed by the present simulation way and the collapsing of the frame after blasting can be ascerlained. The numerical model offers a new design way for demolishing blast of frame building.
A level-embedded lossless image compression method for continuous-tone still images is presented. Level (bit-plane) scalability is achieved by separating the image into two layers (the base layer and the residual layer) before compression. Excellent compression performance is obtained by exploiting both spatial and interlevel correlations. A comparison of the proposed scheme with a number of scalable and non-scalable lossless image compression algorithms indicates that the level-embedded compression incurs only a small penalty in compression efficiency over non-scalable lossless compression, while offering the significant benefit of level-scalability.
KPCA (kernel PCA) is derived from PCA. It can extract nonlinear feature components of samples. However, feature extraction for one sample requires that kernel functions between training samples and the sample be calculated in advance. So, the size of training sample set affects the efficiency of feature extraction. It is supposed that in feature space the eigenvectors may be linearly expressed by a part of training samples, called nodes. According to the supposition, an improved KPCA (IKPCA) algorithm is developed. IKPCA extracts feature components of one sample efficiently, only based on kernel functions between nodes and the sample. Experimental results show that IKPCA is very close to KPCA in performance, while with higher efficiency.
The impropriety industrial production mode is one of the main causes of environmental pollution. From thermodynamics, this paper analyses the entropy essential of the pollution of industrial production. On the basis of this, a dynamic equilibrium entropy flow model is set up to measure the infection of industrial production to the environment. Taking three production modes for example, the entropy increase quantity is calculated by using the model and the environmental effect trends can be educed. It can provide decision-making basis for choice of sustainable production mode.
To solve the prevalent problem of the low informatization level and lack of relevant decision support systems for the multimodal transport in China, transportation characteristics of various transportation modes are analyzed firstly, and choice basis is put forward after comparison. Then a virtual transportation network of multimodal transport is set up. Finally, a combined optimization model for various transportation modes is deduced based on the above and algorithm is also proposed.
A conception of “un-stressing concentration” anti-fatigue for ultra-high strength steel 300 M has been investigated. The compress stress field and cell structure with high density dislocation were formed in surface layer of specimens with the surface integrity machine, shot peening, hole extrusion and screw rolling strengthening, by which the crack initiation was changed to the subsurface from surface, crack propagation was thwarted, fatigue limit at the place of stress concentration were returned to a approximate to the innate fatigue limit of 300 M steel and “un-stressing concentration” surface integrity condition was resulted. This conception of “un-stressing concentration” anti-fatigue was described as a comprehensive equi-fatigue strength, which was equal approximately to the innate fatigue limit of 300M steel, encirclement on the constructure surface case.
In the constantly changing marketing economy, it has become an urgent task for construction industry to find a rapid, simple and practical way to organize construction project budget. To solve this problem, this paper adopts the model of the back-propagation neural network, takes the features of construction as input variables, trains the network using actual data as samples and optimizes the network structure by contribution analysis. It shows the validity of the model in the forecast of construction project budget.
Operating optimization of long-distance water conveyance systems is always intractable for their complexity. In this paper, self-optimization model is introduced to study the problem, which is based on the digital simulation models. Through the on-line optimization tache in it, the decision input can be optimized according to the feedback information of simulating output, so the system can be optimized automatically. With the MATLAB software, simulating optimization of an engineering instance has been achieved, which gives a new way for the research of operating optimization of long-distance complex water conveyance systems.
This paper talks about method to enhance vibration signals gotten by hitting iron pipe to cause a vibrating response from which the damaged pipe information will be found. However, the reflection wave is usually too weak to acquire useful information correctly. The method, in which mccltiple similar signals are superposed, can not only decrease the noise in the signal, but also receive more message that may be lost before because of the interval of sample collection. Since the noise in signals could be treated as white noise, after multiple superposition the added noise will become to zero. The programmed the software to performs efficiently and conveniently. There are some examples in practice to express that this method is correct.
The principal-agent model between employers and engineering supervisors is established, considering such factors as the scale of employers’ investment, special character of engineering supervision and exogenous random variable and its influence. And the influence of these factors on the sensitiveness of compensation performance under asymmetric information is analyzed. Based on the result, factors to be considered while establishing the incentive system of engineering supervision are put forward.
This paper analyses the working parameter adjustment methods for hydraulic impact machine at home and abroad. An adjustment principle with distance shifted continually is first suggested in this paper. A new device with distance shifted continually on the basis of this study is designed, and the computer digital simulation is performed. A hydraulic impact machine which is controlled by computer on the basis of this study is designed. The design principles, structural feature, technical properties and control strategy are also described.
Along with the development of the society, it flows out more and more high-rise, underground and large-space buildings, of which the fire protection designs are sometimes beyond the requirements of existing national fire protection codes of China. Therefore, the performance-based fire protection design of buildings has been getting more and more chances of application. Evacuation analysis is one of the key problems in the performance-based design. In this paper, the performance-based design of a large shopping mall is introduced, and a cellular automata (CA) based evacuation model, i.e. the CAFE model is used to analyze the efficiency of evacuation. Because the interactions among pedestrians and those between pedestrians and environment are quantified in CAFE model, the values of evacuation time obtained through the model are slightly larger than those of an evacuation software, Simulex, indicating that the CAFE model is to some extent more conservative and the analysis results are with higher reliability.
Directed against the demarcating problems of deep tunnel and shallow tunnel in exiting methods, the paper indicates the demarcating method from the viewpoint of characteristic of surrounding rock pressure according to the results of field observation and numerical simulation. By use of numerical simulation technique, the paper,for the first time, expounds the demarcating thought which is based on the changing law of soil lateral pressure coefficient in the centerline. The method is proved feasible by two engineering cases, and is of importantce to lining design and construction of soil tunnel.
Owing to the difficulty of traditional multi-variable regression methods to represent the surrounding rock deformation curve with inflexion points, a method for forecasting tunnel surrounding rock deformation using radial basis function neural networks is presented. This method not only can be utilized to approximate the complex deformation curves, but also has higher convergence speed and better globally-searching ability than those using BP neural networks. An example is given to show the effectiveness and practicability of this method.
This paper systematically introduces the main structure of network device driver based on embedded Linux. With the PCMCIA API, the software modules of embedded AP (access point) and the developing course are stressed. The testing results of the network device driver are given at the end of the paper.