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A well-designed space microgravity environment is an important guarantee of that microgravity science experiments could succeed. However, the actual microgravity acceleration level of spacecraft is far from ideal due to various disturbances. Considering the situation, a cascade Active Disturbance Rejection Control (ADRC) method is proposed to improve the performance of vibration isolation and position...
Impulsive noise is an important challenge for the engineering implementation of active vibration control systems. It can generates larger amplitude outputs of the adaptive filter which are prohibited in practical active vibration control system and destroys the updated stability of the algorithm. An improved filtered-x least mean square algorithm is proposed for impulsive noise in this paper. The...
In this paper, a new robust filtered-x LMS algorithm is proposed for active vibration control system. A Tracking-Differentiator filter and a non-linear transformation function are designed to process the reference and error signals respectively. The updating formula of the filter coefficients in the proposed algorithm is derived from a new minimization criterion that minimizes the Euclidean norm of...
This paper focuses on the space charge characteristics of epoxy resin and its nano-MgO composites exposed to UV irradiation. Compared with the pure epoxy resin samples, different space charge characteristics of the nanocomposites have been found. With the filler content increased (0.5 wt%∼7 wt%), the total amount of charge first decreases, then increases, and then decreases again, then tend to be...
In order to study the interfacial effect on space charge distribution in HVDC bushings which impregnated with epoxy resin, samples just like epoxy-impregnated paper-epoxy were prepared by vacuum casting process. Space charge characteristics have been studied by the method of pulsed electroacoustic (PEA) technique at different electric fields and temperatures, including charge polarity, charge amount,...
Modeling and simulation is recognized as a useful way to evaluate the effectiveness of command and control (C2) systems whereas the modeling of C2 systems is rather difficult. In order to model C2 systems, an entity relationship based method is raised. All levels and all kinds of command posts are abstracted into C2 entity model which is composed of capability model and behavior model. At the same...
The typical permanent magnetic operating mechanism (PMOM) for high-voltage circuit breaker is an electromagnetic driving and permanent magnetic keeping actuator, which is easy to accelerate but hard to decelerate. In order to achieve better performance, a new permanent magnetic operating mechanism (NPMOM) is designed. The NPMOM is a permanent magnetic driving and permanent magnetic keeping actuator...
In this paper, space charge distributions and dielectric properties, such as volume resistivity and ac breakdown strength were studied in low-density polyethylene (LDPE) and its composite by adding nano-ZnO nanofiller before and after corona aging for several days. It was found that a small amount of ZnO nanoparticles could effectively improve corona-stabilization of LDPE matrix. Fourier Transformed...
In this paper, we consider detection for DFT-spread OFDM based 3GPP long term evolution (LTE) uplink transmission, where multiuser multiple-input multiple-output (MUMIMO) technique is employed. We propose an iterative detection method, in which soft interference cancellation based on sorted QR decomposition of frequency domain channel matrix. We show that the new iterative detection has lower computational...
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