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This paper presents a novel adaptive tracking algorithm that fuses multiple cues based on feature uncertainty measurement in the particle filter framework. We first introduce a self-adaptive multi-cue fusion strategy, which overcomes the drawbacks of the traditional product fusion and sum fusion strategies. Furthermore, the proposed strategy effectively sharpens the distribution of the fused posterior...
Wind energy has drawn worldwide attention. Because of simple structure, high efficiency, stable operation and other inherent advantages, variable speed constant frequency (VSCF) direct-drive wind power generation system using permanent magnetic synchronous generator(PMSG) is the development trend and one of the focuses of wind power generation system, on which this paper researches through its converter's...
This paper calculates the reactive power limit of DFIG (doubly fed induction generator), and discusses the current reactive power control schemes of DFIG. Three methods, which use both the grid and rotor side converters for voltage regulation and reactive power support, are analyzed and compared. This paper presents a new coordinated control strategy, which central idea is to use the grid-side converter...
The random vibration adaptive control method is presented based on the recursive least-squares (RLS) adaptive filter. The power spectral density (PSD) of drive signal is updated based on the off-line identification of frequency response function (FRF) in conventional random vibration control system. And the pseudo-random drive signal generated by the conventional time-frequency transformation has...
The random vibration adaptive control method is presented based on the Kalman adaptive filter to improve the control precision of random vibration test system. The Kalman adaptive filter is used to obtain the on-line inverse model of the device under test (DUT). The time domain signal having a reference power spectral density (PSD) is updated by the inverse model. The reference PSD is replicated by...
In this paper, a novel estimation method on Volterra series high-order kernels to nonlinear dynamic system to arbitrary approximation is proposed. On the theoretical basis of kernel function, by the construction of linear space, the issue of solving the Volterra series order kernels is converted to solving the projection of the output of the observation vector in the a sub-space of Hilbert space,...
The multi-input multi-output (MIMO) long-term waveform replication control is presented to reproduce the longterm reference waveform and further enhance the effectiveness of multi degree-of-freedom (DOF) vibration qualification test. When the duration of the reference waveform is long enough that can not be processed within a single fast Fourier transform (FFT) frame, the conventional MIMO transient...
In this paper, a novel method to identify Volterra kernels of nonlinear and dynamical systems is proposed, The new notions introduced here develops an implementation of accurate and efficient nonparametric algorithm for the identification of Volterra series orders up to arbitrary precision. The model of aeroturbine is constructed using Volterra series. It is demonstrated that the speed of the turbine...
Emergent computation is a relatively new approach for understanding the behaviors of complex systems. Central to this approach is the idea that system-level behavior emerges from interaction among individual elements. This paper proposes a network emergent computation model based on cellular automaton, which introduces network operating mechanism, such as store-and-forward, adjacency interaction,...
The LMRE is an important device for railway maintenance, the LMRETB is designed for testing the LMRE lifting high, lifting pressure and sinkage after keeping pressure 3 minutes. Firstly, the test index is given and the measure working process is described. Secondly, the position measure method is proposed, the calibration is used in the position measure progress, and the forecasting compensation is...
The micro force measuring technology is widely used in the area of micro friction test, liquid surface tension analysis, organism micro-structure force test, measurement and calibration of MEMS and NEMS, etc. In view of measurement and realization approach of micro force value, a micro measuring system is proposed. A control electrostatic force generator is adopted to reproduce micro force. The basic...
LMRE is a key tool for railway maintenance, whose function is lifting and moving the rail for repairing. The LMRETB is designed for testing the LMRE lifting high, lifting pressure and sinkage after 3 minutes keeping pressure. The pressure loading system of the test bench is an electric-hydraulic pressure servo control system. Because the overshoot and slow response of the pressure hydraulic control...
To improve the blood compatibility of polyethersulfone (PES) membrane, sulfonated polyethersulfone (SPES) was synthesized through an electrophilic substitution reaction and PES/SPES blending membranes were prepared. The characterization of the SPES was studied by FTIR. The water adsorption and water contact angle experiments show that the hydrophilicity of PES/SPES blend membrane was improved as for...
In order to meet the numerical control process requirements of high speed and high precision of three dimensional curves, the paper studied on a real-time and look-ahead interpolation algorithm for NURBS (non-uniform rational B-spline) curves. The federate is changed adaptive according to the shape of the curves. A real time look-ahead algorithm is introduced to detect the sharp corners. It is found...
According to disadvantages of long measurement time, low monitor precision, and difficulty in automatic monitoring patient body temperature, this paper introduces that temperature sensor DS18B20 is connected to realize distributed body temperature wireless remote concentration monitor system design. Low PC controller AT89C52 analyzes and processes measurement data, as well as drives display-alarm...
The aim of the study is to evaluate the cell affinity of poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) thin films using a parallel plate flow chamber system. The PHBV thin films were modified by anhydrous ammonia gaseous plasma treatment. Mouse 3T3 fibroblast cells were seeded on bare and plasma modified PHBV thin films, respectively. A laminar flow enforces the cells on these films...
Pipe roof reinforcement allows safe excavation by creating longitudinal arching parallel to the tunnel axis. The complexity of boundary conditions of this method, however, imposes difficulties to understand the reinforcement mechanism. There are few attempts to analyze the mechanical behaviors of the reinforcing pipes. In this study, considering the delay effect of initial lining and revising the...
By monitoring of ground behavior and stress of supports during construction of Qiaozhuang tunnel under difficult ground condition, the convergence of supports, the stresses of I-steel supporting, sprayed coatings and secondary lining were obtained. The model is set, and finite element numerical calculating is made. The results of the survey and the computing are compared and analyzed. These results...
In this paper, the optimum layout of passenger drop off lanes on elevated roads in large railway station is studied. Based on the discussion of the evolution of railway stations' functionality, solutions of passenger drop off lanes layout are proposed. In addition, traffic organization and corresponding evaluation parameters of passenger drop off area are discussed. New Zhenzhou high-speed railway...
In this paper, we proposed new intermediate bonding layers (IBLs) of Ag-rich composition in In-Ag solder systems in contrast to previous studies mainly based on eutectic composition. The intermetallic compounds (IMCs) at the bonding interface were investigated with respect to the bonding condition, post-bonding room temperature storage and post-bonding heat treatment. The IMCs of Ag2In and Ag9In4...
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