Applied Mechanics and Materials Vols. 423-426

Abstract: Using the method which is similar to the eye region selection to compute the length of long axis and the short axis of human eyes, reduce the errors caused by the space between the straight lines in Hough Transform. Using Generalized Hof Transform method to extract eyes perimeter, eliminate the interference of the lights, which is more accurate than using 33 template method. With using the region growing method, set an accumulator to calculate the pixels difference value of the seed points and its 33 neighbourhood (the absolute value of the cumulative numbers of the point is less than the threshold) is the human eye area. With those methods, we can extract the characteristics of human eyes.

Abstract: In the period of real time mechanical analysis and life style detection to the excavation tunnel equipment's cutter head, it is a necessity for the signals sensed by detection unit to be pretreatment processed. It closely concerns with the accuracy and validity of whole mechanical analysis results. By analyzing the features of all possible interference, this paper gives a study on signals initial processing applying method of digital filter and blind signal extraction. Simulation results show that the proposed scheme is effective enough to the mechanical analysis task.

Abstract: Nondestructive testing is widely used, the noise signal in echo signal affects defect extraction, so we need to deal with the noise. As a new signal processing tool, wavelet analysis gets people's attention because its good ability to denoise. Wavelet denoising algorithm was applied in this article based on LabVIEW platform, and the denoising of nondestructive testing was realized, the result shows that wavelet denoising algorithm is effective.

Abstract: Ultrasonic NDT signal de-noising effect is the key indicators to determine whether the pipe is defective.Orthogonal matching pursuit algorithm optimization process, the sampling signal and reconstructed signal by the method of least squares.Using Orthogonal Matching Pursuit Algorithm for the sampling signal to optimize and reconstruct. It is successfully to verify the OMP algorithm can recover the signal based on the MATLAB platform.Designed a signal de-noising processing module to help staff to determine pipeline defects conveniently,it achieved de-noising successfully.

Abstract: Noise, an important factor which impact on the performance of ultrasonic online testing system, has a direct influence on the signal-to-noise ratios level of ultrasonic signal acquisition. Noise problem of grain ultrasonic online testing system has been studied in this paper from two aspects, theoretical analysis and engineering practices. In this case, we can solve the noise interference problem in ultrasonic online testing system, and improve the performance of system and signal-to-noise ratio of signal acquisition.

Abstract: The surface dynamometer card is considered as the primary data for a computer analysis of a sucker rod pumping well. There are many problems in the information retrieved from the surface dynamometer card involving duplicated data and reverse direction data (RDD) ,and discontinuous data of the upstroke or the downstroke , etc. This paper presents a simple method for data processing of surface dynamometer card,it is very useful for the dynamics analysis and structural optimization design of pumping unit (PU).

Abstract: A novel selective ensemble of multiple fuzzy ARTMAP (FAM) classifiers based on the correlation measure method and Bayesian belief method is proposed to apply to the fault diagnosis of rolling element bearings in this paper. The test results show that the selective ensemble of four optimal FAM classifiers can identify the different fault categories accurately and has a better classification performance compared to the single FAM and ensemble of all FAM classifiers.

Abstract: Test of the combustion characteristics of cooking oil tar in pipe was conducted. Wavelet transform was introduced to the thermogravimetric data smoothing and differentiation analysis according to the experiment results, and the orthogonal test method was used to find the optimize wavelet parameter. Wavelet transform results were compared to the traditional Moving average,Gaussian Smoothing and Vondrak smoothing methods and it was proved that the signal-to-noise ratio () of the measurement is increased significantly. The kinetic parameters calculated from the original TG curves and smoothed DTG curves have excellent agreement,and thus the wavelet transform smoothing algorithms can be used directly and accurately in kinetic analysis.

Abstract: The algorithm of adaptive loop filter based on flexible quad tree (Q-ALF) is put forward targeting the problem that deblocking loop filter used by H.264/AVC cant further improve video coding quality. This algorithm, through the original image and the image after deblocking filter, works out wiener filter and selects a wiener filter with optimal size by taking the SAD of the image after Wiener filtering and the original image as RDO cost and based on RDO model, then uses this filter to filtrate the area that needs filtration. Simulation result shows that Q-ALF algorithm can improve the PSNR of the reconstructed image and decrease bit rate; meanwhile, Q-ALF algorithm can better eliminate blocking effect, improving the subjective performance of the reconstructed image.

Abstract: As a useful tool for line spectrum detection in underwater signal ,ALE has been used wildly. But there are still some problems to influence the effect of ALE. This paper gives three problems on ALE and analyses these.Then by the characteristics of vector hydrophone and a improved variable step size LMS,this paper constructs a cascade double input with variable step size based on vector hydrophone line spectrum enhancer . This algorithm restrains the noise of main channel twice ,meanwhile controls the noise in reference channel , so as to improve signal to noise ratio better. At the same time ,because of adopting the improved variable step size LMS, the steady-state error is reduced. From the results of simulation and experiment, the method presented in this paper can have a better effect of line spectrum enhancement.