Peng et al 2026b - Revision history

Scipediacontent: Scipediacontent moved page Review 186758166598 to Peng et al 2026b

2026-09-25T11:03:30Z

Scipediacontent moved page Review 186758166598 to Peng et al 2026b

Scipediacontent at 11:00, 25 September 2026

2026-09-25T11:00:33Z

Scipediacontent at 10:58, 25 September 2026

2026-09-25T10:58:40Z

ScipediaAdmin: ScipediaAdmin moved page Draft content 166032187 to Review 186758166598

2026-09-25T10:33:31Z

ScipediaAdmin moved page Draft content 166032187 to Review 186758166598

Scipediacontent: Created page with " == Abstract ==
Metallized polypropylene film capacitors (MFCs) undergo dielectric aging under thermal stress, critically affecting operational reliability. To address the..."

2026-09-25T10:30:27Z

Created page with " == Abstract == <p>Metallized polypropylene film capacitors (MFCs) undergo dielectric aging under thermal stress, critically affecting operational reliability. To address the..."

New page

== Abstract ==

<p>Metallized polypropylene film capacitors (MFCs) undergo dielectric aging under thermal stress, critically affecting operational reliability. To address the insufficient sensitivity of traditional loss-detection methods for early warning, this paper employs frequency-domain dielectric spectroscopy (FDS) to conduct accelerated aging tests on 100 μF automotive-grade MFCs at 120°C. The dielectric loss tangent (tanδ) and capacitance were measured over a wide frequency range (50 Hz–12 kHz). A characteristic frequency of 8100 Hz is identified as an early-warning indicator for thermal aging: while traditional methods detect only 0.7% and 2.5% changes after 360 and 720 h aging respectively, FDS captures 13.68% and 27.5% signal changes at 8100 Hz, reaching 55.5% at capacitor failure (1080 h)—3–8 times more sensitive than conventional approaches. Further analysis reveals frequency-dependent degradation patterns: the low-frequency band reflects increased conductive loss from electrode corrosion, the mid-frequency band shows the most sensitive relaxation loss changes, while high-frequency changes are slower, collectively reflecting progressive aging from interface to bulk. A health index (HI) model integrating multiple spectral features is developed using an improved weighted fusion algorithm, enabling aging state classification into four levels and remaining lifetime prediction with error within 5.6%. This FDSbased tanδ spectral analysis provides a novel approach for MFC lifetime prediction and early aging warning, offering practical significance for enhancing electric drive system reliability in new energy vehicles.OPEN ACCESS Received: 23/10/2025 Accepted: 19/12/2025 Published: 21/09/2026</p>

== Document ==
<pdf>Media:Draft_content_166032187-3835-document.pdf</pdf>

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 == Abstract ==
-<p>Metallized polypropylene film capacitors (MFCs) undergo dielectric aging under thermal stress, critically affecting operational reliability. To address the insufficient sensitivity of traditional loss-detection methods for early warning, this paper employs frequency-domain dielectric spectroscopy (FDS) to conduct accelerated aging tests on 100 &mu;F automotive-grade MFCs at 120&deg;C. The dielectric loss tangent (tan&delta;) and capacitance were measured over a wide frequency range (50 Hz&ndash;12 kHz). A characteristic frequency of 8100 Hz is identified as an early-warning indicator for thermal aging: while traditional methods detect only 0.7% and 2.5% changes after 360 and 720 h aging respectively, FDS captures 13.68% and 27.5% signal changes at 8100 Hz, reaching 55.5% at capacitor failure (1080 h)&mdash;3&ndash;8 times more sensitive than conventional approaches. Further analysis reveals frequency-dependent degradation patterns: the low-frequency band reflects increased conductive loss from electrode corrosion, the mid-frequency band shows the most sensitive relaxation loss changes, while high-frequency changes are slower, collectively reflecting progressive aging from interface to bulk. A health index (HI) model integrating multiple spectral features is developed using an improved weighted fusion algorithm, enabling aging state classification into four levels and remaining lifetime prediction with error within 5.6%. This FDSbased tan&delta; spectral analysis provides a novel approach for MFC lifetime prediction and early aging warning, offering practical significance for enhancing electric drive system reliability in new energy vehicles.OPEN ACCESS Received: 23/10/2025 Accepted: 19/12/2025 Published: 21/09/2026</p>
+<p>As global conventional oil and gas resources continue to deplete, exploration and development are increasingly targeting deep and ultra-deep
+reservoirs with high-temperature, high-pressure (HPHT) conditions.This
+paper presents a comprehensive numerical investigation based on a nonlinear finite element model that integrates impact–contact–fluid coupling. The computational framework employs the Cowper–Symonds ratedependent constitutive law, calibrated via Split Hopkinson Pressure Bar
 == Document ==
 <pdf>Media:Review_186758166598_6857_154. TSP_RIMNI_82948.pdf</pdf>

← Older revision		Revision as of 10:58, 25 September 2026
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	== Document ==		== Document ==
−	<pdf>Media:~~Draft_content_166032187-3835-document~~.pdf</pdf>	+	<pdf>Media:Review_186758166598_6857_154. TSP_RIMNI_82948.pdf</pdf>

← Older revision	Revision as of 11:03, 25 September 2026
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