Applied Mechanics and Materials Vol. 367

Abstract: Delivering a low-carboneconomy puts ourselves on a path to cut CO2 emission, which is the maincontributor to global warming. Developing low-carbon technology in electricityindustry will play an important role in future since electricity always beingthe biggest emission source. This paper analysis electricity carbon emissions usedscenario analysis method in Baoding, forecasts power load based on economictargets and energy efficiency targets, and analysis CO2 emissions by coal powernew technology application scenarios, and then ,carried out some suggestions onthe electricity sector’s CO2 emission reduction work used the analysis results.

Abstract: Thepaper proposes to established the measurement models of China's coal-energychain carbon emissions based on life-cycle analysis, Through comparing the source andsize of the greenhouse gas emissions of coal-energy chain, the paper gains the totalCO2 equivalent emissions of coal-fired power plant generate unit generatingcapacity during coal-energy chain by detailed calculations is 990.716331 gCO2/kwh.Among them, greenhouse gas emission of coal-fired power generation sector isthe main link in coal-energy chain and aslo the focus of regulation andemissino reduction. Finally puts forward some suggestions to achieve low-carbonpath of China'selectric power industry.

Abstract: The alignment of a strapdown inertial navagation system (SDINS) is the process whereby the orientation of body frame is determined with respect to the navigation frame [. In a broad sense, alignment of SDINS can be classified as initial alignment and in-flight alignment (IFA). The IFA is performed with IMU and external sensors during the vehicle flight [2,, in which the primary assistant sources are satellite system, radar, or other airborne equipment, offering reference signals like position, velocity, or attitude to assist the alignment process [4,. However, these sources have disadvantages in redundancy, independence, and stability, which will be incipient faults in emergency take-off or warfare. So it is necessary for us to analyse the subsidiary airborne equipments and design new in-flight alignment scheme.

Abstract: Water integration method is widely used in water minimization. Water minimization has great benefits to environmental and industrial sustainability. Both freshwater consumption and wastewater discharge can be minimized by practicing water system integration. Sulfate process (SP) is an important and mature method to produce titanium dioxide (TiO₂) pigment. A large amount of water is consumed and a large quantity of effluent is discharged, which may cause water resource waste and serious environmental pollution. The paper presents Mathematical Optimization Method for water minimization of a titanium pigment plant event in China. The result of this study shows that mathematical optimization method has been effectively applied for the titanium pigment plant, and the freshwater consumption is reduced by 45.97 %.

Abstract: The wind power generation system have strong nonlinear characteristics with many uncertain factors, which was hard to be controlled exactly by traditional controllers and the sliding mode control was proposed, the sliding surface was selected, the equivalent controller and sweithcing controller was designed. The wind power generation system was analyzed and the mathematical models of aerodynamics, drive train and electromagnetic subsystem were created. The control strategy was applied into wind power generation system with MATLAB/Simulink platform, and the simulation result shows this model is of more important significance on researching the power characteristic and control performance for power generation system, the sliding mode control with high power tracking performance, which can effectively implement maximum energy capture.

Abstract: This paper presents fuzzy logic approach for active vibration control of composite shell structure using collocated piezoelectric sensor/actuator. The vibratory response of piezolaminated composite shell is modeled using degenerated finite shell element. Modeling is based upon first order shear deformation theory and linear piezoelectric theory. The fuzzy IF-THEN rules are established on analysis of the motion traits of laminated composite shell. The fuzzy logic controller (FLC) is designed using the sensor voltage and its derivative as inputs and actuator voltage as output. The simulation results illustrate that this controller has more superiority than the conventional controller.

Abstract: The main aim of a control system is to repress the instabilities caused by nonlinearities of the system. Dead time is considered to be one of the most significant nonlinearities of a system. Dead time compensators play a vital role in reducing the dead time effects on the processes only to a minute extent. This paper proposes a method to overcome this problem by using Enhanced Model Reference Adaptive Control (MRAC) incorporating Smith Predictor. MRAC belongs to class of adaptive servo system in which desired performance is expressed with the help of a reference model. Enhanced MRAC consists of a fuzzy logic controller which provides adaptation gain to MRAC without human interference. A dead time compensator incorporated in the enhanced MRAC solves the problem of instabilities caused by dead time to a greater extent.

Abstract: Differentiation and integration of non-integer order have drawn increasing attention in research community. Fractional order dynamic systems have been recognized as effective tool for characterizing the real world phenomena. This may be implemented by using different control structures in which a fuzzy mechanism is adopted to tune the parameters by using Ziegler-Nichols method. Fractional-order PID control is the development of general integer-order PID controller. This paper proposes the basic framework of fractional order dynamic system with fuzzy weighted set-point. Comparisons are made with PID and FOPID controllers for first and second order systems. The response shows the superiority of the fuzzy set-point weighting methodology over the other methods.

Abstract: Aiming at improving the precision of mortar projectiles, an impulse control mechanism is proposed in this paper. The guidance uses a four-quadrant strapdown laser seeker to detect the intended target and utilizes impulse thrusters to correct the terminal trajectory. Based on the analysis of impulse forces and impulse moments, the 6-DOF equations for the trajectory under control are deduced. Also, the model of the seeker’s acquisition area is established. Numerical simulations of typical corrected trajectories are carried out with the computer programs developed in C code. The results indicate that the impulse thrusters can improve impact point performance effectively. The models and the control algorithms are applicable to the simulation and calculation for similar projectiles.

Abstract: An electric control loading system for aircraft simulation was analyzed and modeled to find a linear state space mathematical model and state feedback. An optimal control scheme based on the minimum integral of the squared difference between desired and actual output was shown to be effective by comparing the output values of the system with previously obtained experimental data. A linear state space mathematical model and state feedback appear to provide satisfactory means for controlling an electric control loading system can be adjusted to simulate a wide variety of real aircraft by altering input and output gains at the force analog computer when aircraft parameters are changed.