Applied Mechanics and Materials Vols. 635-637

Abstract: A novel method which is based on ensemble empirical mode decomposition (EEMD) and symbolic time series analysis (STSA) was proposed in this paper. Firstly, the vibration signal of hydraulic pump was decomposed into a number of stationary intrinsic mode functions (IMFs). Secondly, the sensitive component was extracted. Finally, the relative entropy (RE) was extracted from the sensitive components and they were used as the indicator to distinguish the faults of hydraulic pump. The research results of actual testing vibration signal demonstrated the rationality and effectiveness of the proposed method in this paper.

Abstract: Due to the oil field has been mined production for a long period of time, strata for direct production of crude oil quantity is less and less, and the remaining oil exploitation is the key to improve recovery factor. Study on the method of inter well remaining oil detection theory and technology has become the hot spot. Residual oil mostly existed between casing, whole space model is established, the two radius of 0.1 m and wall thickness of 0.01 m casing place in medium of the whole space, using the casing’s high conductivity characteristics, through calculation and analysis on steady-state solver, get the current density distribution curve of casing in cross section. Research results show that the analysis of inter well reservoir and cross-hole no reservoir at the time of the current density distribution, as well as the current density values, theory and method for inter well remaining oil research to provide certain theoretical support.

Abstract: This paper considered the optimal placement of collocated piezoelectric actuator-sensor pairs on a thin cantilever plate using a modal-based linear quadratic independent modal space controller. LQR performance was taken as objective for finding the optimal location of sensor–actuator pairs.The discrete optimal sensor and actuator location problem was formulated in the framework of a zero–one optimization problem,which was solved by real-coded adaptive genetic algorithm (AGA). The vibration response of the piezoelectric plate was calculated using the finite element method (FEM).The optimization and vibration control programs were written by FORTRAN language. The results of numrical examples show that the adaptive genetic algorithm based on the minimum of LQR performance for the optimal location of sensors and actuators is feasible and effective.

Abstract: The paper introduces the technical features of the railway track inspection cars of different countries and the development review of China’s technology of railway track inspection, and make a brief comparison of the advantage and disadvantage between the chord measurement and Inertial method. The paper also introduce the integrated detection system, which consists of a laser visual detection system, laser radar scanning technology, infrared thermal imaging technology , radar technology and communication detection system. With the implementation of the railway transport, enhanced efforts should be exerted to the comprehensive checking of the track. The development orientation and application of subway inspection equipment is put forward. To develop new portable track inspection cars which can detect the railway tracks and tunnels and the quality of the transmission channel of the train control information, the strength of wireless mobile communication system and track’s electromagnetic environment at the same time.

Abstract: The acoustic thermometry has many advantages, compared with conventional methods of temperature measurements. For this technology, the sound field in normal temperature state of the boiler was simulated; acoustic source signal obtained the pseudo random sequence signal and time delay estimation selected the weighted cross-correlation method. Experiments show that when the boiler is not running, the sound field is enclosure sound field in the furnace. The weighted cross-correlation method can restrain the reverberation and obtain the accurate time delay estimation.

Abstract: In this paper, fault diagnosis model of grounding grid is established combining electrical network theory with sensitivity analysis. A new method which is used to select the node pairs to calculate the corrosion situation of grounding grid is presented. Based on this method, the fault branch of grounding grid can be efficiently judged through topology diagram and port resistance without power failure and the excavation of large area. Field test was carried out at 220 kV electrical substations using the diagnosis method. The conductors diagnosed as severely corroded was excavated. The result was identical to the diagnosis results, indicating that this diagnosis method has engineering practicality.

Abstract: In order to research the uniformity and volatility of thermostatic bath used on electronic thermometer verification, a method based on thermostat technical performance specifications is presented. Including the introduction of calibration device, the choice of standard device and experiment method. In the end the uncertainty analysis on the measurement of thermostatic bath uniformity and volatility is made. Experiment results show that the uniformity and volatility of this thermostatic bath are 0.0091°C and 0.0087°C/10min with the measurement uncertainty of 0.018°C, The results meet the requirements of electronic thermometer verification. It provides guarantee for the next electronic thermometer verification.

Abstract: This paper proposes a ground-based videometric method and system for measuring the glide track of landing aircraft in real time. The proposed method is applicable for large-scale measurement via regional relays with multiple cameras. Its measurement ranges from kilometers away to the landing point, and it simultaneously fulfills the real-time measurement of the position and trajectory of aircraft. The real-time measurement result of the actual aircraft landing process shows a deviation from DGPS(Difference Global Positioning System) as small as 20 cm in the measuring region of 1 km. The proposed measurement method for aircraft landing track based on videometrics can establish a new type of landing aid system removed from radar and GPS.

Abstract: In this paper, the MATLAB image processing technology has been adopted to obtain the contour of a turning tool with arc blade by binarization of the image, median filter as well as detection of the edge. Then curve-fitting method have been used to fit the contour of straight edge and arc-edge respectively. Finally, the nose angle of the cutter and the arc radius of the turning tool have been obtained by the analysis of fitting results of slope for straight edge and curvature radius for arc-edge. It is shown that the measurement of geometric parameters for cutting tools based on MATLAB not only has small measurement errors and high measurement efficiency, but also can be widely used to obtain tiny geometry parameters for tools with high precision.

Abstract: This research aimed at studying the quantitative relationship between chlorophyll content, LAI, yield and spectral parameters of two species of winter wheat (Yangmai 13 and Xumai 31) with Free Air Temperature Increased facility. Four warming scenarios were designed in the experiment: all-day warming (AW, warming of 1.9°C, daytime warming (DW,6:00am-18:00pm,warming of 2.1°C), nighttime warming (NW,18:00 pm-6:00 am next day, warming of 1.7°C) and the control (CK, without warming). The results showed that reflectance of the four treatments at near infrared flat (nm-nm) had significant differences in booting stage and the sequence was: DW>AW>CK>NW. At visible band, the reflectance under NW treatment was much lower than that under other treatments. PND920 and P_Area920 were correlated with chlorophyll with high coefficient of determination. RVI and NDVI which constituted by the 810nm and 560nm reflectance were highly correlated with LAI. Booting stage was the optimum period for yield estimation. P_Depth560, NDVI (560,450) and RVI (560,450) were significantly related to yield and thus they could be utilized for yield prediction.