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It is the scheduler that decides the capability of the embedded system. For the classical rate-monotonic (RM) scheduling algorithm with priority determined only by the period, the deadline of long period tasks can not be guaranteed and the system resources can not be effectively utilized. Here, a new static priority scheduling algorithm called NPRM (a new priority-driven scheduler based on RM) is...
Partial discharge (PD) can be one of the most influential phenomena in the aging of electrical insulation systems. In order to ensure reliability in the operation of such equipment, the detection and interpretation of PD measurements is required to monitor the condition of insulation. In this paper, physical model of typical defects in gas-insulated substation (GIS) are established, and studied for...
A very important aspect of multisensor data fusion is track-to-track association and track fusion in distributed multisensor-multitarget environments. There is a assumption for the proposed approach based on Hopfield neural network that every sensor detect the same targets, but in practice, it is not always realizable. This paper propose a generalized approach based on continuous state Hopfield neural...
Instantaneous reactive power theory (IRPT) proposed by H. Akagi is shortage of detail explanation on the matrix coefficient of alpha - beta transformation. Based on power conservation, the matrix coefficient is deduced in-plane. As the transformation was given out in plane domain, the matrix coefficient is deduced in-plane by rigorous mathematical deduction based on power conservation. Consequently,...
In order to solve vibration signals inaccurate character in gearbox during nonstationary course with traditional computed order analysis, the computed order analysis is improved and the nonlinearity fitting order analysis method is explored. Firstly, the nonstationary vibration signals in the gearbox are sampled at constant time increments in time-domain and then the data are resampled with nonlinearity...
Gray level co-occurrence matrix (GLCM) and the gray level-gradient co-occurrence matrix (GLGCM) were used to analyze gas/liquid flow images. Gas/liquid two-phase flow experiments were practiced and high-speed images were captured. A set of textural features were extracted from the GLCM and GLGCM. Examples of experimental results confirm the effectiveness of several features among them. All of the...
The pulse wave contains many of hemodynamic information, so obtain cardiovascular blood flow parameters by detecting the pulse wave is an important role in examination, treatment and guardianship process of the cardiovascular disease. Recently, most of the pulse wave acquisition and analysis require human intervention. The operators decide when to stop the acquisition by observing and determining...
It is very important for modern directional drilling systems to measure the attitude of drilling accurately. A Micro Electro-Mechanical System (MEMS) composed of a three-axis micro accelerometer and a three-axis micro magnetoresistive is designed. A carrier communication is used to transmit data acquired by sensors instead of the mode of traditional transmission. The theory and the algorithm of the...
Sub-pixel surface fitting technique is a way that fits out a correlation coefficient surface around the point getting by the integer pixel searching and locates the sub-pixel maximum point to get the sub-pixel movement. It is a key way to improve the displacement measurement accuracy in digital speckle correlation method (DSCM), meanwhile, it is more time consuming than other steps. Four sub-pixel...
Shortwave power amplifiers (PAs) are the most important nonlinear components in shortwave communication systems. It will generate significant intermodulation distortion (IMD) resulting in adjacent channel interference and higher bit-error rate when multiple nonconstant envelope modulation signals input into nonlinear PAs. Linearization techniques are necessary to compensate these undesired nonlinear...
Vibration signals which carry the dynamic information of the machines are frequently used for mechanical fault diagnosis. Impulsive modulated signals often generated by the defected gear and how to extract the impulsive components from the raw vibration signal with strong background noise has become the most important tasks for gear fault diagnosis. An adaptive multi-scale morphological gradient (AMMG)...
In order to enhance the reliability of EKL-3 hydrology cableway observation system and the sampling accuracy, we transformed the inlet valve of this system, river bottom weightlessness and the data communication module, then revised the way of measuring according to the hydrology code requirement. To avoid the remaining silt to catch the valve in the sampling process we used the double barrel bistability...
It is very important that researching the rule between the burst-effect of PELE and impact velocity and target thickness, especially for deeply searching the mechanism of PELE and enhancing it's damage efficiency. In this experiment, 35 GrMnSiA and nylon were respectively adopted as the shell and the core of PELE for the first time, the projectiles vertically impacted armor plates range from 5 mm...
Dynamic analysis is carried out for recoil parts in recoil and counter-recoil process to find out the fault effects of liquid and gas leakage of recoil brake and recuperator. In order to detect and simulate the fault occurrence and development process, virtual prototyping is firstly adopted into fault simulation and detection fields in this paper. The basic steps of virtual prototyping development...
In order to extend the application area of robot, by combining the features of the autonomous mobile platform and the flexible operation of manipulator, an autonomous mobile operation platform is built. The platform is composed of an autonomous mobile platform and a manipulator. The general control model is serialization, and the feedback control based on the vision information is used in some parts...
The three common faults of rotating machinery, that is, imbalance, misalignment and rubbing, were simulated on Bently, vibration displacements at every sampling time have been measured according to a certain time interval by using eddy current displacement sensor, then the time-vibration displacements of the three faults have been got, and the corresponding figures of time-displacement were drawn...
The core of digital signal processing is the design of digital filter. At present, most digital filters are designed by Matlab, which is a high-performance numerical calculation software and provides a powerful function of graphical display. Matlab is widely used in engineering calculation, numerical analysis and other fields, but it is less able to develop interface. In this paper, a method of hybrid...
Based on human visual characteristics of nonuniform visual acuity on retina area and binocular coordinated head-eye motion, a bionic visual tracking control strategy is proposed. Tracking task is performed by coordinating omnidirectional vision system and binocular vision system. The omnidirectional vision imitates the foveal periphery keeping 360deg field of vision under surveillance, detects target...
Researching on the maintenance scheduling strategy is important to improve the maintenance performance. Based on the analysis of resource conflict in the maintenance process, the resource scheduling strategy is studied, which includes task priority, resource assign rule, sharing resource of parallel task and cross maintenance. A model is constructed based on Petri net, which reflects the resource...
This paper describes the methods and progress of transplanting the embedded Linux to the target board based on the S3C2440 processor, including the establishment of cross-compiler environment, the reduction and compilation of startup code (bootloader) and Linux kernel and the construction of the root file system with the point focused on the structure and function of bootloader as well as the transplantation...
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