| 1. |
- Ugwiri, M. A., et al.
(författare)
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Cascade based methods in detecting rotating faults using vibration measurements
- 2021
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Ingår i: Conference Record - IEEE Instrumentation and Measurement Technology Conference. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728195391
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Konferensbidrag (refereegranskat)abstract
- In the paper, the pursued objective is to take advantage of two main relevant cascade methods, namely Ensemble Empirical Mode Decomposition (EEMD) and Discrete Wavelet Transform (DWT), for the improvement of the sensitivity of scalar indicators such as Kurtosis (Kurt) and Crest Factor (CF) within the application of condition monitoring by vibration analysis on electric machines. The measurements were possible thanks to the piezoelectric sensors, where the signals were recorded from the machine's critical and judiciously chosen points. The paper demonstrates that when the motor runs under faulty conditions, it is possible to notice the appearance of spallings, which cause the signal to be disturbed and consequently modify the distribution (which is of Gaussian kind in a flawless situation). Nevertheless, those impulse excitations can have a tremendous effect on the values of time-domain indicators. The paper proposes two powerful denoising methods, discussed in-depth the effectiveness of each technique. The conclusion drawn from the analysis shows that the approach improves the sensitivity of selected indicators and therefore increases their reliability for fault presence detection. © 2021 IEEE.
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| 2. |
- Ugwiri, M. A., et al.
(författare)
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Vibrations measurement and current signatures for fault detection in asynchronous motor
- 2020
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Ingår i: Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728144603
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Konferensbidrag (refereegranskat)abstract
- In most industrial applications, Fault Detection (FD) is an important function. Understanding equipment's conditions help engineers and operators avoiding the inevitable catastrophe that could lead to a significate impact on system reliability and safety. For electromechanical devices such as asynchronous motors, which play an essential role in production lines, mastering vibrations for Fault Detection is interesting. Downtime, costly maintenance, and energy waste are damages resulting from faults. The paper presents an overview of different techniques used in asynchronous motors fault detection. Vibrations signals processing and techniques for extracting characteristic features from them are largely developed. Spectrum analysis of the envelope signal is employed to process vibration signals resulting from rolling bearings. The paper also proposes rotors broken bars detection using Park Transformation. It was shown that Park's transformation is an effective tool to detect broken bars even at the incipient stage, which gives to it the merit to be a complementary technique to vibration analysis. © 2020 IEEE.
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| 3. |
- Dello Iacono, S., et al.
(författare)
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PH strip reader for beer samples based on image analysis
- 2020
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Ingår i: Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728187839 ; , s. 319-322
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Konferensbidrag (refereegranskat)abstract
- The measurement of pH is widely used in a number of sectors and applications to evaluate the alkaline or acidic level of aqueous solutions. Among the measurement methods, pH strips are widespread and affordable, although they have a limited accuracy compared to the pH meters. In this work, a method to evaluate the pH value of a test strip, based on image analysis, is presented. The proposed method exploits the color analysis to simplify the use and to improve the nominal accuracy of the test strips. The tests have taken into account the typical pH range in the production of beer, but the method can be extended on the whole range of pH values. © 2020 IEEE.
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| 4. |
- Hoang, M. L., et al.
(författare)
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A New Technique for Optimization of Linear Displacement Measurement based on MEMS Accelerometer
- 2020
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Ingår i: Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728110738 ; , s. 155-158
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Konferensbidrag (refereegranskat)abstract
- Linear displacement has been widely applied in the technology and applications for Industry 4.0. The Micro-electromechanical systems (MEMS) accelerometer is a potential candidate in linear displacement measurement by means of acceleration acquisition. However, the error still presents on the displacement measurement at the starting point or each time the sensor ends its motion and returns to a static state due to the noise and imperfection of mechanical structure. The paper presents a new algorithm, 'No Displacement Zero Translational Accumulation' (NDZTA), to solve the cumulative error of linear measurement when the sensor stays at stationary points. The proposed filter removes noise by pulling down the current velocity and acceleration to 0 immediately when the sensor finishes its motion. Moreover, a simple but practical way to calculate the displacement via the 'Area Integration Method' was visualized and analyzed in detail. The experimental result shows a good accuracy as well as stability of measured result with the maximum error only about 0.2 cm in the range of 200 cm. © 2020 IEEE.
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| 5. |
- Abate, F., et al.
(författare)
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Smart meters and water leakage detection : A preliminary study
- 2019
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Ingår i: I2MTC 2019 Proceedings. - 9781538634608
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Konferensbidrag (refereegranskat)abstract
- The paper deals with water leakage beyond the meter at household level. The automatic leakage detection is emerging as priority task for scientists and technicians. Each possible solution must include the use of smart meters for the continuous survey of domestic water consumption. Water smart meters aren't widespread yet, and the few either are prototypes or exhibit not adequate battery and communication performance. The authors, participants to the EMPIR 17IND13 Metrowamet project, propose an embedded system that can work with different water sensors, whose characteristics have been suitably designed for respecting stringent requirements of energy efficiency, computational burden and wireless transmission capability.
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| 6. |
- Capriglione, D., et al.
(författare)
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Analysis of MEMS devices under temperature stress test
- 2021
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Ingår i: 2021 IEEE International Workshop on Metrology for AeroSpace, MetroAeroSpace 2021 - Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728175560 ; , s. 63-68
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Konferensbidrag (refereegranskat)abstract
- The current technological process has mainly interested in integrating MEMS devices in most technological devices to offer complete control and awareness about a particular process or system. Such devices, which in most cases include gyroscope, accelerometer, and magnetometer, are fully integrated on a single chip and have a cost not higher than few dollars. Recently they have been more employed in embedded systems devoted to the autonomous driving operation for terrestrial and aeronautical vehicles. Such devices are often deployed to the market with datasheet reporting their characteristic without highlighting their behavior under particular environmental conditions. Most MEMS devices are mounted in a very harsh environment, characterized by high-temperature excursion and vibration from different sources. The authors propose a temperature stress test for such devices and evaluate their behavior under static conditions. Experimental results will evidence the accelerometer and gyroscope MEMS sensors' dependence on the temperature in a range of -10°C to 50°C. © 2021 IEEE.
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| 7. |
- Capriglione, D., et al.
(författare)
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Characterization of inertial measurement units under environmental stress screening
- 2020
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Ingår i: Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728144603
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Konferensbidrag (refereegranskat)abstract
- Nowadays, the Micro Electro-Mechanical Systems (MEMS) are widely employed in both consumer and industrial applications. One of the most important fields adopting MEMS device is the inertial measurement sector where this kind of technology is employed to produce Inertial Measurement Unit (IMU) that are typically composed by a triaxial accelerometer, a triaxial gyroscope, and a triaxial magnetometer. The growth of the MEMS is due to their small dimension and cost, challenges that enable their use in several applications belonging from Industry 4.0 to automotive and aerospace. However, all these sectors have in common operating conditions characterized by wide temperatures range and vibrations of different nature. In this framework, both the scientific and technical literature seems lacks suitable measurement procedures to be applied for testing the reliability of such kind of devices under environmental stress. So, this paper proposes a test procedure for Environmental Stress Screening (ESS) to determine any mechanical and electrical weakness or early degradation in a MEMS-based inertial measurement unit, when subjected to mechanical vibration and thermal cycling temperature tests. © 2020 IEEE.
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| 8. |
- Capriglione, D., et al.
(författare)
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Design and Implementation of a Diagnostic Scheme for Stroke Sensors in Motorcycle Semi-active Suspension Systems
- 2020
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Ingår i: Lect. Notes Electr. Eng.. - Cham : Springer. - 9783030375577 ; , s. 335-341
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Konferensbidrag (refereegranskat)abstract
- Today the reliability of electronic systems strictly depends on the correct operations of the sensor involved in the normal use. This fact is more evident in applications where the security and safety of end-users are involved, reason why a suitable Instrument Fault Detection Scheme (IFD) including also Isolation feature (IFDI) becomes fundamental. The automotive field is one of the main areas where an IFDI scheme is mandatory. As an example, systems designed to on-line adapt and to electronically control the suspensions of motorcycles are today of great interest for motorcycle and after-market manufacturers. By the way meanwhile semi-active suspension systems can drastically improve the comfort and the traction performance of motorcycle, a promptness detection of faults involving this kind of system is fundamental for the safety and performance of the motorcycle. With this aim, the paper proposes an Instrument Fault Detection and Isolation (IFDI) scheme using analytical redundancy for the fault diagnosis of the front and rear stroke suspension sensors. Both suitable mathematical links and soft sensors based on artificial neural networks are proposed for the residuals generation in order to design and validate the proposed IFDI scheme. © 2020, Springer Nature Switzerland AG.
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| 9. |
- Capriglione, D., et al.
(författare)
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Development of a test plan and a testbed for performance analysis of MEMS-based IMUs under vibration conditions
- 2020
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Ingår i: Measurement. - : Elsevier B.V.. - 0263-2241 .- 1873-412X. ; 158
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Tidskriftsartikel (refereegranskat)abstract
- Micro-Electro-Mechanical Systems (MEMS) are today widespread in many industrial and consumer applications. In the field of terrestrial transportation, cellular, wearable devices, robotics, drone, to cite a few, MEMS-based Inertial Measurement Units (IMUs) are widely employed for assuring several tasks as for the object tracking, self-driving vehicles, human motion and so on. Expected performance of such systems and also recent literature and technical standards miss considering both a context-awareness reliability analysis and metrological performance analyses of MEMS-based IMUs when operating in real scenarios characterized by the presence of significant temperature excursions, humidity, vibrations, mechanical shocks and so on. In particular, standard procedures to be applied for testing MEMS-based IMUs are not still available. Trying to fill these needs, this paper proposes both a suitable testbed and test plans for performance analysis of such kinds of devices under vibration conditions. The application to a real IMUs has confirmed that the proposed tests allow identifying the effects of mechanical stress on both the reliability and metrological performance of such devices. These results could be useful also for the international committees involved in the definition of technical standards to be adopted for testing these kinds of devices. © 2020 Elsevier Ltd
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| 10. |
- Capriglione, D., et al.
(författare)
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Experimental Analysis of Filtering Algorithms for IMU-Based Applications under Vibrations
- 2021
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Ingår i: IEEE Transactions on Instrumentation and Measurement. - : Institute of Electrical and Electronics Engineers Inc.. - 0018-9456 .- 1557-9662. ; 70
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Tidskriftsartikel (refereegranskat)abstract
- The use of microelectro-mechanical systems (MEMS)-based inertial measurement units (IMUs) is widespread in many applications concerning monitoring, diagnostic, and/or controlling in navigation and transportation systems, as well as in low-cost applications for automotive and aeronautical fields. The data provided by the set of sensors typically present in IMUs, as accelerometers, gyroscopes, and magnetometers, are often used also for feeding suitable filtering and positioning algorithms able to correct the attitude and path of the vehicle on which they are installed or to provide the analytical redundancy needed for online diagnosis. Nevertheless, on one hand, the performance of low-cost MEMS-based IMUs is certified only under a small set of nominal operating conditions, and on the other hand, the filtering algorithms are often designed and verified under canonical additive noises. In this framework, this article proposes a test plan and a test setup for analyzing and characterizing the performance of filtering algorithms for positioning based on data coming from low-cost IMUs and able to verify systematically the operation of such algorithms under real scenarios. Two kinds of very popular filtering algorithms have been considered, namely, the complementary filter and the attitude and heading reference systems (AHRS) Kalman filter, which belong to two opposite approaches. The experimental results prove how the typical vibrations present in real scenarios can significantly affect the performance of such algorithms. © 1963-2012 IEEE.
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