Modeling of the magnetic behavior of permanent magnets including ageing effects

Nunes, Anderson Santos; Daniel, Laurent; Hage-Hassan, Maya; Domenjoud, Mathieu

doi:10.1016/j.jmmm.2020.166930

Cited by 8 publications

(4 citation statements)

References 59 publications

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“…In the case of evaluation through modeling, the governing mathematical equations can be solved locally in the object or body tissues concerned by the effects. This can be performed by using numerical discretized techniques or other methods permitting local evaluation [6,[42][43][44][45][46][47] . This involves the EM equations and the general heat or bio-heat tissue equation [41] .…”

Section: Evaluation Of Thermal Effects 41 Evaluation Methodsmentioning

confidence: 99%

Thermal effects of electromagnetic origin from heating processes to biological disturbances due to field exposure—A review

Razek

2023

TSE

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This contribution aims to appraise, analyze and evaluate the literature relating to the interaction of electromagnetic fields (EMF) with matter and the resulting thermal effects. This relates to the wanted thermal effects via the application of fields as well as those uninvited resulting from exposure to the field. In the paper, the most popular EMF heating technologies are analyzed. This involves on the one hand high frequency induction heating (HFIH) and on the other hand microwave heating (MWH), including microwave ovens and hyperthermia medical treatment. Then, the problem of EMF exposure is examined and the resulting biological thermal effects are illuminated. Thus, the two most common cases of wireless EMF devices, namely digital communication tools and inductive power transfer appliances are analyzed and evaluated. The last part of the paper concerns the determination of the different thermal effects, which are studied and discussed, by considering the governing EMF and heat transfer (or bio heat) equations and their solution methodologies.

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Section: Evaluation Of Thermal Effects 41 Evaluation Methodsmentioning

confidence: 99%

Thermal effects of electromagnetic origin from heating processes to biological disturbances due to field exposure—A review

Razek

2023

TSE

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“…In the case of evaluation through modeling, the governing mathematical equations can be solved locally in the body tissues concerned by the effects or symptoms. This can be performed by using numerical discretized techniques or other methods permitting local evaluation, e.g., [37][38][39][40][41][42][43][44][45]. This involves the EM equations and the bio-heat tissue equation [46].…”

Section: Evaluation Of Rf-emf Be and Asmentioning

confidence: 99%

Assessment and Categorization of Biological Effects and Atypical Symptoms Owing to Exposure to RF Fields from Wireless Energy Devices

Razek

2023

Applied Sciences

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Nowadays, environmental electromagnetic fields exist everywhere and the whole population is exposed. The most widespread technologies engendering exposure to electromagnetic fields for the public and workers are radiofrequency wireless communication systems. Such exposure can have direct effects on living tissue involving biological problems or personal symptoms, as well as indirect effects restricting healthcare appliances. This assessment aims to analyze, examine and categorize the consequences of non-ionizing electromagnetic fields emitted by radiofrequency devices. This concerns biological effects in living tissues and atypical personal symptoms for short and long-term exposures. The evaluation methodology in this field of investigation is also discussed. In the article, these consequences as well as their evaluation techniques, in the case of wireless digital communication tools, are analyzed and reviewed. The categorization of exposure sources, the corresponding effects and their assessment methodologies are analyzed. The concept of systematic reviews and meta-analyses and their applications in various assessments of these effects and symptoms are reviewed and discussed.

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“…Other processes eventually affecting the behaviour of the first stage are the degradation of the permanent magnets and the alteration of the magnetic circuit due to the accumulation of particles within its gaps. The first is due to the well-reported ageing phenomenon, which is primarily driven by the repeated variation of the magnetic loading, temperature variations and the application of mechanical stresses (Nunes et al, 2020). The second fault mode can quickly degrade the performance of the system, but it is unlikely to be an on-going, slowly evolving process, thus making it not predictable and hence not suitable for PHM.…”

Section: Considered Failure Modesmentioning

confidence: 99%

Evaluation of Different PHM Strategies on the Performances of a Prognostic Framework for Electro-Hydraulic Actuators for Stability Control Augmentation Systems

Martin¹,

Jacazio

Sorli

2022

PHM_CONF

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Stability Control Augmentation Systems (SCAS) are widely adopted to enhance the flight stability of rotary-wing aircraft operating in difficult aerodynamic conditions, such as low altitude missions, stationary flight nearby vertical walls or in presence of heavy gusts. Such systems are based upon small electro-hydraulic servosystems controlled in position through a dedicated servovalve. The SCAS operates with limited authority over the main control linkage translating the pilot input in the movement of the main flight control actuator. Being critical for the operability of the helicopter, the definition of a Prognostics and Health Management (PHM) framework for the SCAS systems would provide significant advantages, such as better risk mitigation, improved availability, and a reduction in the occurrences of unpredicted failures which still represent one of the most known downsides of helicopters due to their very severe operational environment. Since SCAS actuators are usually equipped with a low number of sensors, it is at the present time unclear whether a fully realized PHM system can be prepared without resorting to the introduction of additional sensors. This paper deals with this subject evaluating the performances of a fault diagnosis tool operating considering different sensors suite (traditional and with additional sensors), and different PHM strategies, using in-flight data or their combination with dedicated pre-flight checks to cover the most common failure modes. The analysis is then completed with an evaluation of the prognostic capabilities of the proposed strategies, highlighting benefits and limitations of the proposed solutions.

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Modeling of the magnetic behavior of permanent magnets including ageing effects

Cited by 8 publications

References 59 publications

Thermal effects of electromagnetic origin from heating processes to biological disturbances due to field exposure—A review

Thermal effects of electromagnetic origin from heating processes to biological disturbances due to field exposure—A review

Assessment and Categorization of Biological Effects and Atypical Symptoms Owing to Exposure to RF Fields from Wireless Energy Devices

Evaluation of Different PHM Strategies on the Performances of a Prognostic Framework for Electro-Hydraulic Actuators for Stability Control Augmentation Systems

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