Abstract:A new denoising method based on parameter optimized Morlet wavelet is put forward. The Morlet wavelet is chosen as the mother wavelet because its shape is similar to the mechanical shock signals. The mother Morlet wavelet is improved by adding two parameters which decide the shape of the mother wavelet in time domain. The added parameters and the appropriate scale parameter for the wavelet transformation are designed by the cross validation method. Finally, the useful components of the signal can be obtained by the improved Morlet wavelet denoising method. The gear fault diagnosis experimental result shows that the proposed method has a good denosing performance and it is effective in fault feature extraction.

Abstract:According to German specification BV043/85，the shock spectrum of gear system is gotten. Using the spar element, spring element and tetrahedral element, the dynamic finite element model of entire gear system is established with the software of IDEAS, which includes gears, shafts, bearings and gearbox housing. After the normal mode have been calculated, the vibration velocity, vibration acceleration and dynamic stress of gear system under the double halfsine acceleration shock excitation are simulated. The shock resistance performance of the gear system is analyzed based on the strength criterion.

Abstract:Taking the coupling interaction between transverse vibration and torsional vibration of input and output end into account, a transversetorsional coupling dynamic analysis model of triple geared drive system of large marine gearbox is established and dynamical coupling equations of transmission system is built according to energybased Lagrance Law. The natural characteristic and dynamic response of this drive system are analyzed using MATLAB software. The result shows that there’s no resonance phenomenon in the system, it has a good dynamic performance and operates almost periodically under the current operating load.

Abstract:Taking the sliding bearing into account, the lateral vibration analysis models of two single rotor were built respectively using the transfer matrix method. The transmission matrix of herringbone gearcoupled unit is derived. Using whole transfer matrix method, the lateraltorsional coupling analysis model of herringbone gearrotor system is set up, and the vibration characteristics of gearrotorbearing system in gas turbine is analyzed. Through numerical calculation and anlysis, the eigenvalue of gearrotor system, the Logarithmic decrement and the critical speed are obtained. The result shows that the working speed of this gearrotorbearing system is far away from the critical speed, therefore the system is stable and safe.

Abstract:To solve the problems of Vbelt’s slippage during starting phase and the difficulty of the ratio change of snowmobile's rubber Vbelt clutch system, the main reason of the Vbelt’s slippage is found based on the axial force analysis of the primary clutch. Then the speed characteristic of the continuously variable transmission with dual quadrant flyweight is analyzed. The results show that the dual quadrant flyweight not only solves the problem of the Vbelt’s slippage during starting phase effectively, but also increases the transmission efficiency of the clutch system, and improves the characteristic of ratio change of the snowmobile's rubber Vbelt clutch system.

Abstract:Abstract:The heavyrail rolling process is simulated with MSC.Marc software. The flowing law of metal by slicing the nephogram of X, Y direction displacement is analyzed. Then the course of deforming by “timedisplacement” chart of nodes on the outline of horizontal slice is particularly studied. The distribution of the coefficient of elongation is optimized through analyzing Z direction displacement. The result shows that utilizing this method to optimize the universal rolling pass which designed by experience can save the development time and the cost, and improve the quality of heavy rail.

Abstract:Combining model predictive control with dynamic programming, a realtime online receding horizon optimal control strategy for medium hybrid electric vehicles is proposed, which based on the driving states of vehicles built by GPS/GIS on board in the future predictive route. The problem of how to reduce the dynamic programming computation and the system variable quantization are studied. The simulation model of predictive control for the fuel economy of the medium hybrid electric vehicles is built. It is verified by the simulation combining C code with MTALAB\\Simulink, that the predictive control algorithm could meet the need of the realtime control of hybrid electric vehicles, and the fuel economy is increased remarkable compared with the foundational vehicles.

Abstract:Aiming at the problem around single optimal objective and solution selection without considering designer’s preference, optimal objective function combing maximum compression ratio and maximum coefficient of volume utilization is proposed in a liner weighting model based on defined variables. Furthermore, the main factors’ influence is evaluated by analytic hierarchy process (AHP) for its advantage of dealing with qualitative analysis data. The second selective preference is achieved by normalization and second liner weighting. The validity of the method is illustrated by a case study.

Abstract:Focusing on the order delay problem in the process of production, a control model based on the Theory of Constraints (TOC) and Critical Path Method (CPM) are proposed with the analysis of control method, in which it is composed of custom design module, manufacturing management module and optimizing control module. And with the processing costs minimization as objective function, a control mode for production is put forward for minimization of resource consumption and maximization of production. With the case study, it is found that the proposed control mode was effective and applicable.

Abstract:A novel method for power transmission line monitoring and fault diagnosis is proposed based on nonlinear frequency response analysis. The power line carrier signal has been used for online monitoring of power transmission line. As the nonlinear frequency response function describes the system inherent characterization, different frequency response patterns corresponding to different operation states of transmission line can be established. Based on the analysis of transmission line characteristics of fault modes, various fault features can be extracted, thereby achieve online monitoring and fault diagnosis on transmission line. Simulation experiments show the effectiveness of the proposed method.

Abstract:BP neural network based gas sensor array detection pattern recognition has some disadvantages, such as slow convergence and local minimum problem. A modified immune neural network model which combines BP algorithm and immune algorithm is proposed to enhance global search capability and improve the performance of the neural network model. Orthogonal test is adopted to design the study samples of neural network. This ensures the accuracy of neural network while reducing the number of samples. The simulation results show that the proposed pattern recognition method solves the cross sensitivity of gas sensor effectively, overcomes the disadvantages of traditional BP neural network and improves the learning speed and detection accuracy.

Abstract:Conventional control methods for controllable reactor of transformer type generally depend on the parameters of transformer and cannot control capacitor voltage effectively. A novel control method for controllable reactor of transformer type is proposed. Based on a novel algorithm for fundamental extraction, the proposed approach can control the reactance accurately in realtime mode by monitoring the condition of primary voltage and current. It also can control the capacitor voltage effectively and keep the capacitor voltage stable by introducing the feedback of capacitor voltage to control the phase of secondary current. Simulation has been carried out to proof the effectiveness of the method.

Abstract:The number of underdetermined equation, which is limited by the grounding down lines, reduces the grounding grid corrosion diagnostic precision. Based on the grounding grid fault diagnosis method and sensitivity analysis, the value of slip resistance change on the impact of the port resistance in several cases, such as small span, large span and edge, center and symmetrical crossline of the grounding grid, is analyzed. A new method which is used to select the node pairs to calculate the corrosion situation of grounding grid is presented. Based on this method, the simulation analysis and field test has been done. The experimental results show that this method could improve the accuracy and efficiency of grounding grid fault diagnosis.

Abstract:The traditional direct iteration method has low computational efficiency, poor iterative performance and computational difficulties for the analysis of power frequency electric field (PFEF) of key devices within substation, especially involving multimedium.The preconditioning generalized minimal residual (GMRES) boundary element method (BEM) is proposed to enhance computational efficiency of three dimensional PFEF of key devices within substation, where it can’t be solved by the traditional direct iteration method. The basic principle and implementation steps are given. PFEF distribution of switch and break for 500kV substation switch field is presented to demonstrate the efficiency and accuracy of preconditioning GMRES BEM for studying large scale PFEF of key devices within substation. The proposed preconditioning GMRES BEM can not only improve convergence rate and residual convergence rate but also reduce computation cost without decreasing accuracy. Therefore, it is superior to direct iteration method and a suitable algorithm to solve the largescale systems arising from the PFEF of key devices within substation.

Abstract:Transmission capacity and operation stability are affected by reactive power and voltage control modes for ultrahigh voltage(UHV) transmission line. This paper presents the powerangle characteristic equations described by the distributed parameters and powervoltage characteristic equations for transmission line. Using powervoltage characteristic equations, it analyzes operation characteristic under constant voltage control at the sending end and constant power factor at the receiving end of transmission line. At the same time, it draws PV characteristic curves under three typical power factors at the receiving end. It indicates transmission capacity of transmission line will increase with power factors at the receiving end rising. But power area leading to overvoltage will extend, especially it appears very big over opencircuit voltage area under leading power factor at the receiving end. Using the powerangle characteristic equations, it derives formulas of surplus reactive power and demands of reactive power compensation capacity under constant voltage of each end of transmission line. Taking JindongnanNanyang Jingmen 1 000 kV UHV transmission line as an example, transmission capacity and demands of reactive power compensation capacity are calculated for two control modes.

Abstract:Combined the optimal placement method of triaxial accelerometers based upon the effective independence algorithm(EFI3) and the improved onedimensional effective independence algorithm, the optimal placement method of bidirectional accelerometers for the tower (EFI2) is proposed. The modal matrix on xdirection and ydirection are used as input instead of the uniaxial data. And according to the most linear independence and greater energy distribution of modal shape, EFI2 can optimize the sensor placement of accelerometers on both directions at the same time. On a long span extra highvoltage transmission tower as a case study, the sensor placement in the direction of transversal and longitudinal wires is optimized by the EFI2 method. And with assessment by two methods, it is found that the EFI2 method can optimize the sensor placement of accelerometers on both directions effectively.

Abstract:The limit value for the widthtothickness ratio of the hotrolled equilateral angle steel member from ‘Guide for design of transmission tower’ by American Society of Civil Engineers and ‘Technical Regulation of design for tower and pole structure of overhead transmission line’（DL/T51542002） in China is discussed. And the different method of dealing with local buckling instability of single angle columns is compared. With six group axial compressed test of different slenderness ratio, it is found that the current structural design standards DL/T51542002 used in the calculation of highstrength steel stability is conservative. According to finite element method(FEM), the strength subtraction coefficient under axial compression in DL/T51542002 is amended.

Abstract:Using selfmade creep seepage experimental apparatus, triaxial creep tests on outburst prone coal are carried out with coal samples taken from Songzao Coal Mine. It is found that the attenuation creep property is shown in the conditions of less than its longterm strength load, while nonattenuation creep property for the greater conditions. By introducing a viscoelastoplastic body which can describe the deformation property of nonNewtonian fluids, the viscoelastoplastic creep model of outburst prone coal is put forward combined with a PoytingThomson model. The model parameters were fitted out with Matlab programmer and validation is employed. It is found that the test results were in good agreement with those by the proposed model.

Abstract:A coking plant extended many times, and its capacity of the cooling water system is not match with it, the consumption of new water is much more than that used by others in the same industry. The water system renovation is addressed for an extended coking plant. The installation of two 600 m3/h cooling towers and restoration the existing two cooling towers are to promote the cooling capacity so that the amount of discharge and feed could be reduced. At the same time, the pipe net for waste water reutilisation is installed, by which part of the waste water is reused as supplement water for quenching hot coke and the other was piped to ironworks for reuse. With the field test, the water consumption per ton of coke production is cut down from 9.03 m3 to 3.21 m3. And the annual water saving is more than 6×106 m3. Furthermore, the electric consumption is reduced by 2×106 kWh and about 3×106 yuan of annual running cost is saved.

Abstract:With establishing the fundamental equation of prestressed circular membrane under Fpplvon Kármán membrane theory, Hencky transform is extended and the general solution of axisymmetrical deformation of prestressed circular membrane under uniformly distributed loads is obtained. The central deflection, the radial and circumferential stresses of the membrane are given in the form of power series. And it is found that the solution approaches to the results from Hencky theory when the prestressing is far less than the loads; and the solution approaches to the results based on linear theory when the prestressing is far greater than the loads.

Abstract:For the prediction of coal and gas outburst intensity, Incorporate Genetic Algorithm Based Back Propagation Neural Network(IGABP) is proposed to solve the limitations in the traditional GABP such as timeconsuming, optimal stop condition of GA pretreatment indeterminacy, independency and complex task of great importance etc. IGABP addresses some improvements in adaptive crossover and mutation probability to promote GA performance. And with the introduction of BP operator in the evolution of GA operations, the standard GA optimization is from random search to selfguiding search and the convergence rate of GA is upgraded, as well as the determination ability of exact solution. With a simulation as a case study, it is found that the minimum error and standard error with IGABP are 0.012 and 0.227, respectively, compared with -0.126 and 1.529 by traditional GABP.

Abstract:The ferronickel submerged arc furnace slags are stored up more and more, as a result, seriously influenced the sustainable development of the nickel industry. By grinding, the ferronickel submerged arc furnace slag is mechanically activated, then can be used as supplementary cementitious material, thus a comprehensive utilization way of ferronickel submerged arc furnace slag is developed. Using such processed slag to replace cement from 10% to 40% in mass, with the increase of replacing dosage, the water demand of standard consistency of cement paste is lowered, the fluidity of mortar is raised; the compressive strength of mortar is decreased; the flexural strength is increased followed by a decrease after the dosage is above 10%, the ratio of flexural strength to compressive strength is increased. The experimental results indicate that the ferronickel submerged arc furnace slag can be used as supplementary cementitious material and has an increase of flexural strength and effect of plasticizing and water reducing.

Abstract:Aiming at the problem that the gain amplitude is hard to identify in advance and the gain value can not be set properly, an auto gain control (AGC) strategy using Kalman filter is presented to deal with the uncertainty in vibration acquire system. The design principles, algorithms and circuit implementation are described. The experimental results show that this method can not only control auto gain in dynamic data acquiring system, but also get wide gain amplitude range without setting the initial value. It has important practical application value in high dynamic range data acquisition.