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Degeneration data can provide important life information of solder joints. In this paper, a statistical regression model is proposed to evaluate the failure process of board level solder joints under vibration load. First, the fixed frequency and amplitude vibration test is conducted, and the voltage signals at both sides of the solder joint are collected through a bleeder circuit and a high-speed...
Vibration sensor is becoming an essential part of Internet of Things (IoT), fueled by the quickly evolving technology improving the measurement accuracy and lowering the hardware cost. Vibration sensors physically attach to core equipments in control and manufacturing systems, e.g., motors and tubes, providing key insight into the running status of these devices. Massive readings from vibration sensors,...
HALT, Highly Accelerated Life Test, is a process used to discover product weakness and design margins. Used on printed circuit board assemblies (PCBAs) or product modules, it consists of a series of environmental stresses applied to the product in increasing levels of stress, until the product malfunctions or fails. HALT typically utilizes stresses well beyond the product specifications in order to...
Currently, the issues of maintenance are coming into the forefront among the interests of companies. The present article describes the four development stages of maintenance, the classification of maintenance is referred to and a relationship between maintenance and technical diagnostics is analyzed. Furthermore, the article evaluates, on a particular example from the engineering practice, the technical...
The HolderCPS system presented in this paper falls into the category of recording systems created for the proactive maintenance of rotary bladed machines. Based on an innovative architecture, the Holder-type system contributes to machine equipment diagnosis and to early warnings on potential flaws in the functioning of the machine. The system is able to determine, in real time, the causes of the warnings...
Speaking about the commutation's equipment, it can be said that the best solution in increasing reliability and lowering the maintenance costs is a continuous monitoring of the equipment. However, if the price/quality ratio is considered, it is obvious that, for the moment, the diagnosis can be also an acceptable solution. Nowadays the predictive maintenance for equipment's diagnosis is currently...
Large numbers of experiments have shown that grinding chatter is one of the major forms of host fault performance in grinding processes. In view of this, more advanced monitoring techniques are required to ensure the high reliability of grinders. The empirical mode decomposition (EMD) technique has shown promise for meeting this requirement. In general, EMD has been limited to processing one-dimensional...
This paper investigates the reliability of the Package-on-Package (PoP) under random vibration loading by experimental tests and FEM simulations. An event detector was used to monitor the PoP failure times under random vibration. A finite element model of the PoP assembly model was built in ANSYS, and the natural frequencies and modes were calculated and verified by experimental model test. The results...
An innovative E-simulation model based on E-experiment for misalignment fault detection and diagnosis that are commonly observed in rotating machinery systems has been proposed in this paper. Coupling misalignment is a condition where the shafts of the driver machine and driven machine are not on the same center line. Non-coaxial misalignment may be either due to the parallel misalignment or an angular...
A method is proposed for monitoring sealed battery condition, especially gas formation between electrode layers by detecting the vibrational characteristics on audio frequency range or low ultrasonic frequency range, measured using an actuator and one or more vibration sensors. The method can use driving point response, transmission response, or both to determine the battery status. Experimental results...
As the demand for wind energy continues to grow at exponential rates, reducing operation and maintenance costs and increasing reliability is now a top priority. Aside from developing more advanced wind turbines designs to improve the availability, an effective way to achieve this improvement is to apply reliable and cost-effective condition monitoring techniques. After highlighting on condition monitoring,...
With the cost of modern weapons, equipment procurement use and security (OSS) increasing, economic affordability becomes an unavoidable problem. Aerospace, defense departments, the services and other industries increasingly unable to afford such a huge financial even material resources and manpower cost. Based on the equipment maintenance cost estimation on the study, this paper focuses on the costs...
As wireless sensor networks (WSNs) have developed over the last decade, environmental scientists have widely adapted this new technology to monitor various phenomena in the natural environment, for example, debris flows, pollution, volcanoes, and so on. However, significant efforts are still needed to customize WSN design for certain special requirements. To remedy the redundancy of efforts to customize...
The Italian Navy committed in 2006 to the Department of Astronautics, Electrical, and Energy Engineering-University of Rome “Sapienza” a Research Program aimed to define an automated procedure for air-gap monitoring of onboard generators. An effective solution was needed to overcome the heavy shortcomings of usual manual measurement practices. This paper describes the research work which led to very...
As an advanced technology for information sensing and transmission, Internet of Things (IoT) has been applied extensively in the power generation, transmission, substations, distribution, utilization and other processes, and will develop with broad prospect in Smart Grid. This paper focuses on IoT application in transmission lines. A networking strategy for transmission line on-line monitoring system...
Vibration is the main reason for earthen sites to deform and collapse. It is necessary to get vibration data for providing basis to further conserving earthen sites. Traditional monitoring methods are not suitable for the earthen sites because it is destructive and unsustainable. We use the technique of wireless sensor network (WSN) to get the vibration data, and delve into how to transmit large amounts...
Wireless Sensor Networks (WSNs) leverage battery-powered embedded devices to sense from and act on the environment. Their characteristics are at odds with the lifetime requirements in monitoring of civil structures. In this paper, we briefly describe the challenges at stake and how to address them, drawing from recent literature and our own real-world experience. Hardware solutions include MEMS sensors...
Equipment Health Monitoring through Predictive Maintenance (PDM) data is proposed and the same is demonstrated with case study. Steel Rolling Mill Gearbox is considered for the purpose. Empirical failure rate model using Equipment Health Index (EHI) is proposed and used it for forecasting maintenance requirements of the process equipment. The strength of the proposed approach lies in integrating multiple...
Modern engineering systems are becoming increasingly complex, sophisticated, demanding and globally distributed. Maintaining and sustaining such systems healthy, reliably, safely wherever and whenever needed efficiently and economically is a challenging task facing the 21st century. It is gratifying to note that significant advances are being made by researchers from academia, public and private R...
Advent of VLSI technology has paved the way for Programmable Logic Devices (PLD), which are widely used as the basic building blocks in high integrity electronic systems. PLDs are considered for their robust features such as high gate density, performance, speed etc. For PFBR Instrumentation and Control systems, PLDs are extensively used to implement digital designs such as VME bus interface logic,...
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