Acoustic Emission of Monolithic IGBT Transistors

Formed in the aftermath of gravitational core-collapse supernova explosions, neutron stars are unique cosmic laboratories for probing the properties of matter under extreme conditions that cannot be reproduced in terrestrial laboratories. The interior of a neutron star, endowed with the highest magnetic fields known and with densities spanning about ten orders of magnitude from the surface to the centre, is predicted to exhibit various phases of dense strongly interacting matter, whose physics is reviewed in this chapter. The outer layers of a neutron star consist of a solid nuclear crust, permeated by a neutron ocean in its densest region, possibly on top of a nuclear "pasta" mantle. The properties of these layers and of the homogeneous isospin asymmetric nuclear matter beneath constituting the outer core may still be constrained by terrestrial experiments. The inner core of highly degenerate, strongly interacting matter poses a few puzzles and questions which are reviewed here together with perspectives for their resolution. Consequences of the dense-matter phases for observables such the neutron-star mass-radius relationship and the prospects to uncover their structure with modern observational programmes are touched upon.

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“…From Ref. [402], see also [404]. mass) twins, just by slightly varying the unknown screening parameter to be α = 0.3.…”

Section: Low-mass Twin Stars: Gw170817 and Nicermentioning

confidence: 99%

Phases of Dense Matter in Compact Stars

Blaschke

Chamel

2018

The Physics and Astrophysics of Neutron Stars

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“…An AE measuring sensor of the developed diagnostic system is placed in way of the injection pump head as shown in Figure 4. The signal is then transmitted to the dedicated recorder of AE elastic waves [7][8][9]. The AE signal from an injection pump is recorded while the engine is working.…”

Section: Methodsmentioning

confidence: 99%

A New Method of Identifying the Limit Condition of Injection Pump Wear in Self-Ignition Engines

Bejger

Drzewieniecki

2020

Energies

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The quality or reliability of diagnostics is understood as obtaining the most likely diagnosis, and finding possible causes leading to incorrect operation of the system. In real engine running conditions it is often very difficult. Dependable methods providing the most reliable diagnoses have not been developed yet. It becomes more and more important to identify the limit state in condition monitoring—the state that should not be exceeded because continued operation of such a machine is not advisable for technical, economic, or operational safety reasons. The authors have implemented a method using acoustic emission signal analysis for the identification of the injection pump limit state in a working engine. The use of the cross gain function allows one to reliably diagnose limit conditions related to the wear of the precision pair in injection pumps of running engines, working as energy transmission systems on ships and in land-based power stations. The paper draws the results for two different marine diesel engines: two-stroke (by MAN B&W type 7S80MC-C) and four-stroke (by Wartsila type SW 380). The experiment results obtained indicate that the use of the cross gain function allows us to determine the limit condition for a various type of injection pump.

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“…The IGBT transistor combines the advantages of low switching voltage (MOSFET) and high current and voltage (BJT) conductivity [1]. The modular construction of the IGBT transistor causes the formation of additional capacities and parasitic inductance, which during charging are responsible for the shape of the acoustic wave [5]. Another factor responsible for the acoustic waves generation are temperature changes inside the silicon structure caused by current flow across the connectors and supply connections [6].…”

Section: Structure Of the Igbt Transistormentioning

confidence: 99%

Experimental investigations of monolithic IGBT transistor acoustic emission phenomena

Kozak

Gordon

2019

ITM Web Conf.

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Many recent researches are focused on the diagnostic methods allowing determination of the condition of working semiconductor components (power transistors, diodes etc.). As any solid material under stresses (mechanical, temperature and electrical) the semiconductors are generating elastic waves in the case of changing conductivity state. Based on the results of experimental research, a correlation can be observed between the transition between the on and off states of a single IGBT transistor and the emitted acoustic signal. Acquisition of acoustic emission signals was obtained with use of a wide band acoustic emission sensor. The received signal initially was prepared by AD input card with amplifier and then were recorded by means of a computer software. Acquired data were exported the to a file, which enabled further processing of the measured signals. The aim of the study was to determine the acoustic emission background signal coming from switching IGBT transistor and preparation of frequency response. The results of analysis will be used as a reference point for a further investigation of early-stage faults of semiconductors elements.

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Acoustic Emission of Monolithic IGBT Transistors

Cited by 10 publications

References 4 publications

Phases of Dense Matter in Compact Stars

Phases of Dense Matter in Compact Stars

A New Method of Identifying the Limit Condition of Injection Pump Wear in Self-Ignition Engines

Experimental investigations of monolithic IGBT transistor acoustic emission phenomena

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