Abstract Power Spectral Density (PSD) refers to the amount of power per unit of frequency as a function of the frequency. The PSD describes how the power (or variance) of a time series is distributed with frequency. In this research, we calculated Grms (Root-Mean-Square Acceleration) and PSD of NAJI fire pump on healthy and unhealthy situations. In addition, we calculated Grms... Power Spectral Density (PSD) refers to the amount of power per unit of frequency as a function of the frequency. The PSD describes how the power (or variance) of a time series is distributed with frequency. In this research, we calculated Grms (Root-Mean-Square Acceleration) and PSD of NAJI fire pump on healthy and unhealthy situations. In addition, we calculated Grms and PSD of NAJI fire pump electromotor on healthy, misalign and looseness situations. The results showed that different situations showed different PSD vs. frequency. With calculating PSD, we could find some fault and diagnosis of pump and electromotor as soon as possible. The results of this paper have given more understanding on the dependent roles of vibration analysis and Power Spectral Density carve in predicting and diagnosing of the pump and the electromotor faults. Read More Read Less

Abstract As many mechanical problems are initially recognized by a change in machinery vibration amplitudes, we can constantly monitor the condition of a machine by using vibration analysis and make more detailed analyses to determine the health of a machine. Exponential distribution function was used for calculating a process water pump fault probability. This paper focuses on investigating the correlation between... As many mechanical problems are initially recognized by a change in machinery vibration amplitudes, we can constantly monitor the condition of a machine by using vibration analysis and make more detailed analyses to determine the health of a machine. Exponential distribution function was used for calculating a process water pump fault probability. This paper focuses on investigating the correlation between vibration analyses, time signal, fault diagnosis and Fault Probability Distribution Function (FPDF) of a process water pump. We were analysed measured time signal of a process water pump before and after repair situations. The FPDF of unhealthy situation was calculated. We can more understand on the dependent roles of vibration analysis in predicting and diagnosing machine faults and the results showed that by using the fault probability distribution function, we can find the specific frequency and the exact value of fault probability as soon as possible. Read More Read Less

Abstract Person’s identification or recognition is a first problem step in all security systems. In these systems, Ear biometric was suggested to be a crucial tool for recognizing people in critical, important organizations and government security agencies. It is unique to each individual and relatively unchanging during lifetime. The proposed system in this study presents a new algorithm for ear recognition.... Person’s identification or recognition is a first problem step in all security systems. In these systems, Ear biometric was suggested to be a crucial tool for recognizing people in critical, important organizations and government security agencies. It is unique to each individual and relatively unchanging during lifetime. The proposed system in this study presents a new algorithm for ear recognition. It offers a mathematical model based on centroied and related cluster analysis which tries to find a reciprocal twin sample to the nearest neighbors and then they are grouped as a cluster. System is trained on individual subjects with the same conditions. Each enrolled image subject is converted to a gray scale. Experimental results reflect that the proposed system can be offered 93% accuracy, less complexity and can make more accuracy with subjects who are those have a short hair. Read More Read Less

Abstract The basic idea of this work was to study the application of expert systems and fuzzy logic in the field of diagnostic and industrial maintenance. For this, a fuzzy expert system designed, developed and simulated in Ain Touta cement society in Batna in the East of Algeria. Dedicated to control cement mill. The application of fuzzy logic and expert systems... The basic idea of this work was to study the application of expert systems and fuzzy logic in the field of diagnostic and industrial maintenance. For this, a fuzzy expert system designed, developed and simulated in Ain Touta cement society in Batna in the East of Algeria. Dedicated to control cement mill. The application of fuzzy logic and expert systems to control the difference shown in the control system using fuzzy regulators for the operation of the grinding without unnecessary stops, it also helps the operator to know the maintenance task to perform. In addition, regulators decentralization allows the availability of fuzzy control, even if one of the regulators is absent, it does not prevent the other to complete its task to control fineness, mill’s temperature and feed. Read More Read Less