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The study is velocity control of multi-stage cylinder driven mechanism erecting, the nonlinear and time varying characteristics of the large mechanism erecting process is analyzed, the technology difficulties of robustness and stability is discussed. the angle velocity tracking control strategy of the erecting process is proposed, and the erecting angle velocity is designed based on the sine acceleration...
In rough sets theory, attribute reduction is considered as an important preprocessing step for machine learning, pattern recognition, and data mining. The algorithms of attribute reduction and attribute core on rough sets are main content of rough sets theory. Positive region algorithm is an important branch. Many positive region algorithms have been proposed, however the time and space complexity...
Most environmental loads are non-uniform spatio-temporal random fields, which can not be directly divided to field elements. It restricts the usage of SFEA (Stochastic Finite Element Analysis) and makes the dynamical response calculation difficult. The authors propound a model transformation based method that rewrites the sample function of a non-uniform random field as a determinate function multiplied...
Node localization is a fundamental and important technology in wireless sensor networks (WSNs). With regard to the mechanisms used for estimating location, existing localization algorithms can be divided into two categories: range-based and range-free. Compared with range-based schemes, range-free schemes do not need to measure or estimate distances or angles and are thus more suitable for WSNs. However,...
At present, although most of the literatures about virtual instruments (VI) are based on LabVIEW, it lacks of flexibility and expansibility as a graphical development environment. In order to program a short cycle, friendly interface, easy-to-use and easy-to-repot application, the paper uses Visual C++.Net and Measurement Studio instead of LabVIEW as the platform. Measurement Studio includes a Visual...
The principle of each support mode is introduced. The disadvantages of traditional support mode and the advantages of MAP, tele-calibration and traveling-calibration are discussed. The tendency of metrology support mode is analyzed.
Image registration is an important task of image processing. In parallax image mosaic, the geometric registration is a global registration minimized residual in translation model. In order to realize quick and robust geometric registration of parallax image, a coarse-to-fine global registration strategy using the coarse images weighted with detail image is proposed. Taking the advantage of multi-resolution...
The paper analyzes the characteristics and styles of the messages which are contained in the generally complicated testing control system. On the conflict between real-time message and the continuity of the state information, a new CAN bus network structure which is based on fault tolerant redundancy has been brought forward, and the protocol was established. The new net-structure can not only ensure...
The improvement of equipment complexity leads to more complicated faults reasons, and the requests of the ability, efficiency and feasibility to deal with the faults are improving continuously. So the quondam manual diagnosis and the fault diagnosis method by traditional single expert system cannot adapt to the request of monitoring and diagnosis to modern complex equipment any more. In this paper,...
To realize the function for monitoring and fault diagnosis real time, fulfil the request of celerity, maneuverability and high reliability of a weapon system and conquer the problem of the single function and the miscellaneous structure of tradition monitoring and diagnosis system, a new-style portable fault diagnosis device for the complex weapon system based on PC104 bus is designed. The device...
The conventional method of principal component analysis (PCA) is reducing data dimensions directly from m to k (k<m) by one step. The lost information of PCA is holistically determined by the k. To reduce the lost information in the case of k is determined, we decrease the dimensions of the data from m to k by n(1lesnles(m-k))steps. This new PCA method is called multi-step PCA (MPCA). The algorithm...
To improve the reliability of the vehicle control system of a large scale weapon system, a scheme of adopting sensor redundancy is proposed. The structure of the redundancy adopts parallel redundancy and the dimensions of it are two. To solve the problem of dualistic decision with almost equal probability, a trapezium probability distribution function which well solves this problem is constructed...
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