Papers by Keyword: Multi-Parameters

Abstract: When acoustic wave passes through concrete, it can reflect concrete quality information through velocity of sound, amplitude, and frequency. Because single acoustic parameter is incapable of reflect concrete quality information in full, the paper carry out the research of multi-parameter models of strength estimation of cement concrete. The paper founded multi-parameter mathematic models of strength estimation on based of wave equation with ultrasonic method. These models consist of dual-parameter model I between velocities of sound, attenuation coefficient I and compressive strength , dual-parameter model II between velocities of sound, attenuation coefficient II and compressive strength, and tri-parameter between velocities of sound, attenuation coefficient I, and attenuation coefficient II and compressive strength. Correlation coefficient of strength estimation of dual-parameter and tri-parameter models is higher. When testing distance is equivalent standard test block in detecting structure of cement concrete, these models may be adopted strength estimation of dual-parameter and tri-parameter models apply in Penetrating method of ultrasonic directive wave.

Abstract: Accurate detection of the direction of hydraulic fracturing cracks in the oil field is one of the crucial factors in rational exploitation of the remaining oil and enhanced oil recovery. In this paper, using the potential and the potential gradient test methods and virtual instrument technology, we design and develop an intelligent borehole-surface electrical method multi-parameters detection system (BEMDS), which can achieve multi-channel, multi-parameter and high-precision borehole-surface electrical method data acquisition. Joint programming technology of Labview and Matlab gains the simultaneously measurement of the parameters of resistivity and induced polarization. As a result, the drawbacks of the original instrument that measuring single parameters and cannot mutually authenticate has been overcome.

Abstract: In this paper, relations between multi-parameters of the tested wastewater before and after treatment by a constructed wetland were analyzed using Spearman Rank Correlation to get better understand of the processes taken in the system. The results show that COD level of the influent is positive related to DO concentration in the influent while slightly related to COD of the effluent. Concentrations of TN and ammonia in the influent are negative correlated to DO of effluent. DO and carbon source are the most important factors influencing the efficiency of the tested constructed wetland.

Abstract: Monitoring systems based on fiber optic technology have proved to exhibit meaningful benefits when compared with the current solutions of an electricnature. A novel low cost sensing system for measuring temperature, strain and pressure based on practical fiber Bragg grating (FBG) to be embedded into concrete is given in this paper. At the same time, the main principles of multi-parameter are introduced. The wavelength scanning demodulation system based on continuous wave tunable frequency is designed. The practical FBG sensors have been successfully used in monitoring cable-stayed bridge’s health monitoring. The system's conception, the adopted sensors network architecture, and the practical installation of a monitoring system based on FBG sensors are discussed. The experimental results indicate that practical FBG sensors can monitor the structure parameters for a long time, as well as have higher stability.

Abstract: The main purpose of this study was to construct a relationship between the cutting parameters and the machined surface on high speed milling operation. An optimization algorithm using an Exponential Equation and BP method (EEBP) is then applied to determine optimal cutting parameters. For using the method, once the material removal volumes for machined parts of the high speed milling operations are given, the surface quality could be predicted. The final result we choose the surface roughness prediction as an example of H13 dies steel HSM in this paper, it presents that the method is efficient and feasible.