Abstract:For the observability of nonlinear system,the observability matrix was derived using the Lie differentiation combining with the correlation theory of differential geometry,and an analytic method to measure the observability degree of nonlinear system was given.Then the method was applied in the observability analysis of deep space autonomous navigation system based on the Sun line-of-sight vector.The variations of observability degree for different orbital elements were investigated.Furthermore,in order to verify the relation between the observability degree and the estimation accuracy of the navigation system,the navigation process under different observability degrees was performed based on the extended Kalman filter.The method of the observability analysis proposed in this paper was demonstrated to be feasible from simulation results.

Abstract:In order to make full use of the resource of earth observation satellites and acquire higher quality scenes,a multi-objective grey ant colony system was proposed.Firstly,the interval grey was used to describe the cloud cover above the area of an imaging task.Then a multi-objective optimization model of the earth observation satellites was built with the consideration of the importance of imaging tasks and their quality.Finally,the grey theory and ant colony system were combined with the rule of updating by region and the spirit strategy to improve the diversity and the convergence of Pareto optimal set.The experimental results show that the proposed system can solve the scheduling problem for multi-objective earth observation satellites effectively.

Abstract:To address the problem of robust position tracking of underactuated autonomous underwater vehicles(AUVs) with parameter uncertainties and external disturbances in the horizontal plane,a robust position tracking controller is presented based on the Lyapunov stability theory by using backstepping technique.To compensate the uncertainties,a sliding mode control scheme was proposed.The desired trajectory was chosen as a sinusoidal curve.Simulation results are presented for the underactuated AUV systems with parameter uncertainties and external disturbances to illustrate the effectiveness and robustness of the proposed control schemes.

Abstract:A new design method for linear system with model uncertainty is presented to restrain the external disturbance,which can design the repetitive controller and the output feedback controller simultaneously.The disturbance rejection problem of the linear system is reformulated as a robust stability problem of the system with structured uncertainties through introducing a fictitious uncertainty.Using small gain theorem,a sufficient condition is derived,which ensures robust stability of the system with structured uncertainties.A stable matrix is introduced to get a sufficient condition with less conservativeness for the system with structured uncertainties.Basing on the resulting sufficient condition,by using linear matrix inequality(LMI) and cone complementarity linearization(CCL),an iterative algorithm is presented to calculate the largest cut-off frequency of the low-pass filter in the repetitive controller and the parameters of the output feedback controller simultaneously.Finally,the validity of this method is verified by a low-frequency linear vibration table system.

Abstract:In order to establish dynamics equation of resonator in HRG,the strains and stresses of an arbitrary point in the hemispherical thin shell were deduced under Kirchhoff-Lyav hypothesis.The force and torque equilibrium equations of the thin shell element selected from the resonator were gained on the basis of the calculated strains and stresses,then the border motion equations of the HRG were obtained in consideration of the subjected 3-D angular rate and the 3-D angular acceleration.Finally the dynamics equations of resonator were established by Bubonov-Galerkin method which is common used for solving differential equations,thus the natural frequency is computed by the established dynamics equations.By contrast with other methods of calculating natural frequency and the measured frequency values of practical HRG,the correctness of the established dynamics equations and the method of frequency calculation are proved.

Abstract:Considering influence factor of rotation of moon and geostrophic force,a precise three-dimensional dynamics model for lunar probe returning from the moon was presented.To realize the minimal fuel consumption,an optimal open-loop control law in the propulsion direction of the engine was proposed based on the Pontryagin’s maximum principle.The optimal orbit of returning from the moon was obtained when the velocity and position restrictions were comsidered.The design in this paper is favorable for engineering application.

Abstract:Aimed at the problem that TDMA,FDMA and CDMA do not adapt to cognitive radio(CR) for its non-continuous,random and variable spectrum,a system about multiple access of CR based on transform domain communication system(TDCS) is proposed.It avoids disturbing the primary users through making the amplitude of busy spectrum be zero.The m state sequences are adopted to produce random phase vectors.Basis functions on modulation produced by phase vectors are orthogonal and can achieve multiple access.Data are estimated through making the correlation of the signal and basis functions of receiver,and the theoretical BER of this system is analyzed.Simulations show that the detection probability,the number of accessed users and the difference of basis functions between the transmitter and receiver will affect the performance of this system.This system can use the non-continuous spectrum,and its basis functions are self-adaptive,which make it be used in CR.

Abstract:For the purpose of improving space countermeasure capabilities,a method to control visible light reflection characteristics was given.Polyhedral structure and mirror surface were used during the surface design.Diffuse reflection surface and spherical structure should be avoided.Then taking the a cone target in 250 km high orbit and a cylinder target in 900 km high orbit as examples,the visible area on the ground was analyzed.It is found that the visible area of space target decreases significantly for the design of mirror surface and the observed shape changes,which results in the stealth of space target.The research can provide some reference for the exterior design of space target.

Abstract:In order to improve the performance of the closed-loop micro-accelerometer and control the feedback system better,a PID controller was used,a mathematical model of the system was established and the transfer function of the system was analyzed.The model was simulated in the software SIMULINK.Results show that the PID controller can optimize the damping of the system.In addition,both the response time and rise time of the system are decreased.Experimental results show that the performance of the closed-loop accelerometer is improved significantly for the use of PID.

Abstract:In order to understand the influence of lunar soil’s properties on wheel-soil interaction mechanics,physical and mechanical properties of lunar soil were analyzed;lunar soil simulant was made and experiments were performed to measure soil parameters and wheel-soil interaction mechanics.The parameters of lunar soil simulant are estimated or identified according to the experimental data.Theoretical and numerical analysis have been done by substituting typical lunar soil parameters into the model,and the results are compared with the experimental data which shows that the soil parameters of bearing property primarily influence the wheel sinkage,the resistance moment of wheel is mainly influenced by shearing property of soil,and the contact angle coefficients that can reflect the physical property of soil has relatively small influence on wheel-soil interaction.

Abstract:Direct drive electro-hydraulic servo rotary vane steering gear is new high efficiency energy saving and high power density steering gear.In order to obtain performance parameters of this steering gear accurately,a mathematical model for it is established,and the exponent number of the model is determine,then searching is performed for the best parameter values between the upper and lower bounds of the parameters using a new identification method based on ant colony optimization-genetic algorithm(ACO-GA).The goal is to make the calculating output approach to the experimental one.The model is also verified by another group of experimental data,and the result shows that the close ratio is over 87%,which proves that the model parameters identified are reasonable.

Abstract:To decrease the dynamic parameter errors of a space robot and improve accuracy of path planning,according to the angular momentum conservation equation,and based on the difference between the angular momentums estimated by nominal dynamic parameters and the real ones,an error model is built for the dynamic parameter identification,then the fitness function used for Genetic Algorithm(GA) is also presented.For "early maturity"phenomenon easily occurred in the conventional GA,an improved GA is presented based on small bound,big mutation and elite reservation tactics.At last,as an example of a six-joint space robot,a simulation is carried out.The results show that the improved GA increases calculative efficiency and identification accuracy in spite of complicated parameters.

Abstract:To improve the machining process and productivity,an optimization method by virtual machining to acquire the machining parameters in turning is presented so that the optimization of machining process can be realized by optimizing the machining parameters in NC programs.The algorithm to acquire the implicit cutting depth and cutting speed based on the profile polygon representation of workpiece is highlighted during virtual machining,and the optimum cutting parameters can be searched with optimization algorithm,and then an optimized machining process is achieved via revising the spindle speed and feed rate in NC a program.The results of controlled actual cutting experiments show that the machining time is reduced significantly and the maximum power of the machine tool is reached.The machining process and productivity are improved with optimization.

Abstract:For the spindle speed of high precision CNC milling machine up to 160 000 r/min,the cutting torque of blades less that 0.005 N·m,an aerodynamic calculation and graphic design have been done for the swinging angle milling head spindle-driven turbine-type air motor cascade,and numerical simulation of aerodynamic character has been conducted by using software Fluent.The results have been compared with the theoretical calculations to verify the correctness of simulation.The change of aerodynamic characterictics with inlet angle,leaf number and blade height,has been studied and the best parameters are inlet angle 21°,leaf number 36,and blade height 3.5 mm.

Abstract:In order to overcome the problems of long design cycle and high costs of grinding machine and improve the accuracy of noncircular gear,a new noncircular gear grinding method,based on 3-axis noncircular gear shaping machine has been put forward by adding form-grinding.Dividing motion data with no interference and no putting grinder up has been deduced using noncircular gear tooth generated method in the shaping process.A simple function could translate 4-axis motion data to 3-axis motion data in noncircular gear grinding process.The problem that it is difficult to grind noncircular gear hard tooth has been solved,that makes noncircular gear grinding with high accuracy became possible.

Abstract:The flow around a square cylinder confined in a two-dimensional channel is investigated for Re = 100 using the lattice Boltzmann method(LBM).Three blockage ratios are considered.The effects of channel walls on drag and lift coefficients of cylinder,Strouhal number and vortex structures in the wake of the cylinder are examined.The variations of the coefficients and the Strouhal number with the blockage ratio are presented.It is found that both the drag coefficient and the Strouhal number increase with the blockage ratio while the lift coefficient decreases.The drag coefficient increases as much as 30% compared to that for an unconfined square cylinder.The results are compared with related experimental data in literature and a good agreement is achieved.The comparison also shows that the LBM has capability in simulating bluff body flows.

Abstract:The relationship between the surface pressure distribution and the number of joints was investigated by use of panel method.Effects of the number of joints on flap angle,pitching moment coefficient and shaft torque were also discussed.Results show that the relative flap angle will decrease with the increasing number of joints of trailing-edge and the wing surface and pressure distribution tend to be smooth.But the problem that the flexible trailing-edge will cause larger pitching moment can not be overcome by multi-sectional trailingedge.The shaft torque will increase with the increasing number of joints.Relevant research results can provide technical support for flexible trailing-edge designing.

Abstract:To improve the resource positioning rate and routing efficiency in the content addressable network,a directional multicast routing algorithm based on path redundancy is put forward.Integrating the advantages of the directional and broadcasting routing algorithms,the new algorithm employs the extending coefficient to enlarge the dimensions of the CAN logical space.Meanwhile,the positioning efficiency of the new algorithm is increased by combining the directional multicast routing algorithm with the probability path redundancy.The effectiveness of the algorithm is proved in the simulation.

Abstract:In this paper time characteristics of dynamic multi-documents summarization has been analyzed by the clustering idea in topic detection technology.From the change of time information threshold value,differ-ent multi-document clustering and multi-documents summarization for the dynamic Web information data stream can be generated.By compared with different threshold values,the importance of time information in a dynamic multi-document summarization is understanded.Experimental result means that you can counterpoise the output of TDT by adjusting α value and generate better quality dynamic multi-document summarization.

Abstract:Dynamic infrared properties of high temperature hypersonic jetflow have been investigated.A numerical method was developed to solve the radiative heat transfer for non-gray absorbing,emitting and scattering medium by using the narrow-band model combined with molecular spectral access and the Mie scattering theory.The 2-5 microwave infrared properties of a high temperature jetflow including infrared images,spectral radiances,inband radiances and apparent source intensities were simulated at different altitudes.The results show that there are two distinct peak values in the jetflow spectra,and the spectral selection are similar at various altitudes.When the flight altitude begins increasing with ignition,the infrared spectral radiances increase until a certain altitude,and then get lower.At low altitude,the 2-3 microwave inband radiance are larger than the 4-5 microwave inband radiance,and the 4-5 inband radiance will become bigger than the 2-3 microwave inband radiance when the altitude increases.

Abstract:The negotiation behaviors of stakeholders in construction project are analyzed by employing KMRW reputation model.The replicator dynamic models of general contractor and owner are separately established.Two kinds of evolutionary stable strategy of dynamic game in construction project negotiation,trust and distrust,are elicited based on the replicator dynamic models.Discount coefficient,excess income and initial dedication of partners are identified as three critical factors which affect the evolutionary directions of construction project negotiation system.Based on the analysis of three factors’effects on project negotiation system,it is reasoned out that adopting trust strategy is the critical success factor for keeping cooperative evolutionary direction and cooperative stability of project negotiation.

Abstract:The effluent of sedimentation tank in water supply plant was dealt with by powdered activated carbon(PAC)-UF process,and the turbidity,CODMn,UV254,TOC and the trichloromathane formation potential of influent and effluent in PAC-UF process were measured.The results showed that the addtion of PAC could enhance the removal of particles and colloidal substances in water,which kept the turbidity of effluent lower than 0.1 NTU and the removal rate remaining above 95%.The addtion of PAC could improve the removal of organics in PAC-UF process and reduce 23.9%-31.4% trichloromethane formation potential with the optimum PAC dosage of 20-30 mg/L.It was also found that PAC could reduce membrane fouling,and the membrane fouling in PAC-UF process was mainly consist of PAC cake layer which could be easily removed by hydraulic backwashing.

Abstract:Considering the unique thermal and load characteristics of underground store,a new DCV strategy has been established in this study.Combining the features of CO2 control with conventional temperature control VAV system,this new system can achieve the PID control for both CO2 and temperature,and a hand-off auto switch mode can be used to operate the system automatically.The system has been modeled by a dynamic simulation system,and a simulations for an existent underground store in Shanghai has been carried out.The results show that comparing with the conventional CAV system and VAV system,about 22.2% and 17.5% of the annual energy consumption can be saved,respectively,which demostrates that the DCV strategy is an acceptable technique to control thermal environment and indoor air quality simultaneously in underground stores.

Abstract:To shorten the time needed for determination of biological oxygen demand(BOD),this study reports a method that can be used for rapid measurement of BOD in domestic organic wastewater based on air cathode microbial fuel cell technology.Testing results indicated that when glucose was used as single organic substrate,the relationship between voltage output and glucose concentration followed Monod equation.When glucose concentration(BOD) was less than 100 mg/L,good linear relationship between voltage and glucose concentration was obtained.It’s merely needed about 10 h to determine BOD in effluent from aeration grit chamber,primary clarifier and aeration tank in wastewater treatment plant by air-cathode microbial fuel cell,which effectively shortens the measurement time.

Abstract:In order to develop a high efficiency sterilization method,the inactivation efficiency of combined UV/ozone process was evaluated,and the effect of ultraviolet intensity,ozone concentration,hydroxyl radical,pH value,and temperature on inactivation of total bacteria was investigated.Results indicated that compared with individual unit processes of ozone or UV,the inactivation of total bacteria and coliform group by the combined ozone/UV process was enhanced under identical conditions.With an initial ozone concentration of 5.02 mg·L-1,a UV fluence rate of 6.5 mW·cm-2,and a sterilization time ranged from 1.5 to 9 s,the inactivation ratio of UV/O3 process reached 3.6-6.4,while using only UV and ozone alone reached 1.8-4.7 and 1.6-3.0 respectively.The presence and absence of hydroxyl radical experiment demonstrated that the formation of hydroxyl radical was the main reason for the enhancement of inactivation efficiency.With the ultraviolet intensity and ozone concentration increasing,the sterilization efficiency was improved.When the pH value ranged from 5.5 to 8.5,the sterilization efficiency increased with the pH value,while the temperature increased from 10 ℃ to 27 ℃,the efficiency of sterilization decreased a little.These suggest that UV/O3 process has potential for water sterilization.

Abstract:With use of bioinformatics analysis,five completely sequenced L.delbrueckii subsp.bulgaricus and S.thermophilus genomes were scanned in order to predict two component systems(TCSs) and reveal protocooperation between L.delbrueckii subsp.bulgaricus and S.thermophilus.5-9 pairs of the putative TCSs were detected and analyzed in the five genomes.Biological functions of the putative TCSs were predicted by comparing them with those of other microorganisms.Some of TCSs were putatively involved in production of antimicrobial peptides,proteolytic ability,and developing competence etc.The results clue to that the cooperation between L.delbrueckii subsp.bulgaricus and S.thermophilus was established by means of these TCSs.

Abstract:This paper presents a new real-time path planning algorithm for robot in dynamic uncertainty environment,which has good applicability.The first part of the algorithm is the analysis and interpretation of the environment information by searching the characteristic information(Double-Safe-Edges,DSE),so it can catch dynamic obstacle,estimate the state of the dynamic obstacle and update the characteristic information to the second part of the algorithm at the same time.The second part is the choice of double-safe local goal to generate the motion command by using heuristic algorithm.The result of simulation proves that the DSE algorithm is real-time and has good applicability in dynamic uncertainty environment.

Abstract:The system of the zero-speed fin stabilizers controlled by common PID controller can hardly obtain satisfying performance,so an improved adaptive single neuron controller is developed,and the capability for nonlinear processing is improved without increasing the structural complexity of the neuron.To reduce the requirement of the power for driving servo system,from the viewpoint of the quadratic performance index employed in optimal control,the indirect constraint to the driving power is realized by means of online updating parameters in the neuron adaptively.The Lyapunov stability of the system with this control method is proved.Compared with the common PID control under different sea conditions,the advantage for controlling zero-speed fin stabilizer system with nonlinear input is demonstrated.

Abstract:A feature extraction of edible oil FTIR based on fractal geometry is proposed and theoretical calculation formulas of fractal dimension are introduced in this paper.The calculation method of box-counting dimension based on FTIR is analyzed.Through the comparison of FTIR fractal dimensions,the different spectral could be distinguished.Based on the open source computer vision library OpenCV,the FTIR of edible vegetable oils fractal dimension calculation algorithm has been finished.Taking the corn and sesame oil as examples.The detecting result indicates that the FTIR of corn oil and sesame oil can be discriminated effectively by the difference of box-counting dimension.

Abstract:Mesh-free method,such as the SPH method,has great advantage in numerical simulation of deto-nation wave.Based on previous research,the SPH method is applied to simulate the underwater explosion process of high explosives in the paper,and the time-history curves of pressure and velocity are obtained.The numerical results are compared with the theoretical and experimental results,and these show that SPH method is suitable for solving such problems as underwater explosion with extremely large deformation and large inho-mogeneity in dynamic characteristics.The numerical results have reached high precision.

Abstract:To enhance the edge response of the image and then extract the edge robustly,a pre-processing method based on inverse bilateral filtering is proposed,which will make the edge appear perfectly.For bilateral filter having good capability to preserve the edge and good response on low and high frequencies,a new concept for inverse bilateral filter is constructed.And then,strategies of self-adaptive threshold and non-maximum suppress are adopted to extract the edge from the gradient module map of enhanced image.Experiments show that the proposed method has better extraction result with variable illuminance and less sensibility to the noise.

Abstract:In order to explore and establish a scientific effective and comprehensive recruitment management process and valuation system,and based on several information before students entering college,such as regions and location,the score in college entrance examination,the rank in certain regions,a new model to deal with enrollment strategy and related matters has been set up in this paper.By a real case,it shows that the model is suitable to analyze the quality of fresh students,and can provide proper guidance for planning college enrollment stralegy.The model reliability and result accuracy can be significantly inproved by reasonable adjustment of penalty matrix.

Abstract:To construct a rational and efficient communication structure and a high-efficient data storage path for CMP system,a kind of scalable and configurable CMP architecture utilizing multi-channel Cache(AUMCC) is proposed in this article and its prototype system is established based on FPGA and LOEN3 processor.Multi-channel Cache is adopted as L2 Cache in AUMCC.AUMCC can be configured to be private L2 Cache structure or shared L2 Cache structure based on the access mode of multi-channel Cache.Simulation and testing results show that AUMCC architecture can achieve about 37% performance improvement compared with shared L2 Cache BUS-centric(SCA) architecture,and the hierarchy characteristic of AUMCC assures the good scalability.

Abstract:An integrated system scheme is proposed to realize uniform access of distributed and heterogeneous network resources.The scheme achieves virtual integration using Web Service、SRU and meta search technology,realizes service integration by OpenURL,and provides personalized service through constructing contextbased knowledge base.The experimental result demonstrates that the scheme obtains effective integration of different kinds of resources and service,and one-stop access of the network resources and service realizes efficiently as well.

Abstract:In order to investigate the genetic effect of space flight on pepper,the mutation on the root tip cells was studied in SP1 generation.The results showed that aerospace environment increased the mitotic index,and caused micronucleus and chromosomal aberrations including chromosome bridges,chromosome fragments and multipolar division etc.The rate of chromosome aberration and micronuclei were obviously increased in three treated materials compared with the untreated ones,which indicated that cytological mutations were induced by space flight.

Abstract:Considering of the problems of poor quality of power supply,voltage fluctuations and no automatic adjustment of light in the mountain highway tunnel,an adaptive energy-efficient system has been designed.In this system,the main transformer and terminal equipment use smart two linkage regulator,and an adaptive technology inside cave,light regulation,power factor automatic compensation techniques are also used to meet tunnel lighting design specifications.By this system,the high operating costs and tunnel safety can be solved well,and the energy saving can be achieved too.