MAPAN最新文献

{"title":"Test and Evaluation of Burning Explosion Power of Dry-Type Bushing","authors":"Jiahui Chen,&nbsp;Deren Kong,&nbsp;Liu Chao","doi":"10.1007/s12647-025-00849-3","DOIUrl":"10.1007/s12647-025-00849-3","url":null,"abstract":"<div><p>In order to study the burning explosion power characteristics of different dry-type bushings, the burning explosion experiments of resin-impregnated fiber bushing and resin-impregnated paper bushing under 10 kV ultra-high voltages were carried out. The power parameters such as burning explosion pressure, fragment velocity, and temperature were tested, and the explosion power of the bushings was quantitatively evaluated. The results showed that the time-history curves of bushing explosion pressure all show two peaks, and there is a time difference between the two energy releases. In the same radius, the maximum explosion pressure of the fiber bushing is higher than that of the paper bushing by 34%-49%. For the fiber bushing, the first pressure peak is largest in the different radius range, but the first peak of the paper bushing is about half of the second peak, and the pressure duration is only half of the fiber bushing. The pressure propagation speeds of the fiber bushing and paper bushing are 380 m/s and 452 m/s, respectively. When the fiber bushing explodes, the average velocity of the fragments in the direction of the jet orifice is 94 m/s, and the velocity of the fragments is only 10 m/s in the direction away from the jet orifice. The fragment velocity in different directions is basically the same for the paper bushing is about 50 m/s at a radius of 3 m. The temperature rises rapidly when the fiber bushing explodes and continues for a long time when it is reduced to about 3000 K. The time history curve of the temperature of the paper bushing shows an upward-downward-upward trend. The maximum temperature of the fiber bushing is 5399 K, which is higher than that of the paper bushing by 724 K<b>.</b></p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 4","pages":"963 - 973"},"PeriodicalIF":1.3,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145646300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement and Prediction of Chatter Stability in CNC Milling Using VMD and Decision Tree Classification","authors":"Pushpendra Kumar Kushwaha,&nbsp;Pankaj Gupta,&nbsp;Rohit Mishra","doi":"10.1007/s12647-025-00853-7","DOIUrl":"10.1007/s12647-025-00853-7","url":null,"abstract":"<div><p>This study proposes a novel online monitoring system for chatter vibration detection in milling processes, utilizing the Variational Mode Decomposition (VMD) technique in conjunction with Spectral Entropy. VMD, an advanced and robust signal processing method, is employed to decompose audio signals captured during milling into Intrinsic Mode Functions (IMFs), enabling the analysis of complex signal patterns. Controlled milling experiments were conducted by varying key cutting parameters, and the signals were processed to extract 16 statistical features, including Root Mean Square (RMS), Waveform Index, Skewness Index, Crest Factor, Log Energy Entropy, Power Spectral Entropy, Spectral Entropy, and Log Detector. Among these features, Spectral Entropy demonstrated superior predictive capabilities in distinguishing chatter conditions—stable, transient, and unstable states. For classification, multiple machine learning models were applied, including Random Forest, J48 Decision Tree, and REP Tree classifiers. The J48 classifier achieved the highest accuracy of 86.11%, followed by the REP Tree classifier with 82.22%, and the Random Forest classifier with 81.11%. These results highlight the effectiveness of the J48 classifier in providing precise and reliable classification of chatter states. The proposed approach significantly contributes to the development of an effective real-time chatter vibration monitoring system, enhancing diagnostic accuracy and offering innovative solutions for improving machining operations.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 4","pages":"943 - 962"},"PeriodicalIF":1.3,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145646326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing Efficiency in Screw Compressors Through Sustainable Polyglycol-Based Lubricants","authors":"Abhishek Kumar,&nbsp;Ahmed Kovacevic,&nbsp;Abhimanyu Chaudhari","doi":"10.1007/s12647-025-00847-5","DOIUrl":"10.1007/s12647-025-00847-5","url":null,"abstract":"<div><p>This research examines the transformative impact of synthetic lubricants, particularly polyglycol-based oils, on the operational efficiency of screw compressors, emphasising the advancement of sustainable industrial practices. The synthetic oil, noted for its superior oxidation stability, prolongs oil change intervals and enhances the longevity of filters and separators. The integration of specialised inhibitors guarantees the preservation of internal compressor cleanliness, resulting in continued high efficiency. Experimental investigations comparing synthetic polyglycol oil to conventional mineral oil in screw compressors indicate substantial enhancements in overall efficiency. The synthetic oil offers extended maintenance intervals, achieving up to 8,000 operating hours in oil-injected screw-type compressors and 40,000 operating hours in turbocompressors, alongside prolonged filter and separator lifespans and diminished cleaning expenses due to its exceptional dirt-dissolving properties. Additionally, the synthetic oil aids in sustaining low oil vapour levels in compressed air, minimising oil use, and averting the gumming of pneumatic valves. The synthetic oil adheres to industrial requirements (DIN 51506-VDL and ISO 6743-3 L-DAJ) and demonstrates outstanding wear prevention for steel friction components. Possessing a kinematic viscosity of 55 mm<span>(^{2})</span>/sec at 40 <span>(^{circ })</span>C, it exceeds bearing life specifications, hence forming an efficient lubricating coating for anti-friction bearings. The study highlights the considerable potential of sustainable lubricants, especially polyglycol-based oils, in improving efficiency and reinforcing the environmental sustainability of screw compressors. This study offers significant insights into the practical applications of synthetic lubricants in industrial settings, highlighting polyglycol-based oils as a viable solution for enhancing screw compressor technology. The study elucidates a vital element of sustainable materials within the industrial sector, providing an in-depth comprehension of their influence on machinery efficacy.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 3","pages":"809 - 821"},"PeriodicalIF":1.3,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12647-025-00847-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement and Evaluation of Airborne Sound Insulation and Absorption Characteristics of Noise Barriers Made of Different Materials for Noise Control Applications","authors":"Bhagwat Singh Chauhan,&nbsp;Saurabh Kumar,&nbsp;Naveen Garg,&nbsp;Chitra Gautam","doi":"10.1007/s12647-025-00845-7","DOIUrl":"10.1007/s12647-025-00845-7","url":null,"abstract":"<div><p>The present study reports the airborne sound insulation and absorption characteristics of noise barriers and acoustical facades tested in reverberation chambers. These materials were fabricated from the sandwich partition panels and masonry structure for noise control. The study presents the rarely reported sound insulation and absorption properties of wide kinds of sandwich and masonry constructions used as noise barriers. The sound insulation characteristics of metallic, polycarbonate sheets (transparent/opaque), composite fiber cement boards, AAC blocks, green materials, facade glass, and other distinct materials are presented for their applications either as noise barriers or acoustical facades in buildings exposed to higher noise levels. Also, the sound insulation as well as absorption performances of recycled plastic, polycarbonate and metallic material based noise barriers were evaluated. The study also presents the sound insulation characteristics of temporary noise barriers that can be useful for noise control at construction sites and sound absorption characteristics of metal absorptive noise barriers tested in reverberation chambers. The applications of the study may not be limited only to usability as a noise barrier but also to balcony treatments and facades. The rarely reported sound insulation and absorption characteristics of various materials discussed in the present study makes it indispensable for designers and consultants for developing noise barriers accomplishing the desired insertion loss characteristics.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 3","pages":"839 - 882"},"PeriodicalIF":1.3,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ISO Standardized Form Removal and Filtering of Surface Texture for Areal Surface Roughness Measurement Using Zygo Mx","authors":"Moshahid Raza,&nbsp;Zafar Alam,&nbsp;Arun Dayal Udai","doi":"10.1007/s12647-025-00844-8","DOIUrl":"10.1007/s12647-025-00844-8","url":null,"abstract":"<div><p>The areal quantitative analysis of the surface texture is performed using non-contact type 3-D optical surface profilometer. The captured curved surface consists of macroscopic form, waviness, roughness, and system noise correspond to large, intermediate, small, and very small wavelength signal respectively. It is important to separate the roughness from the captured surface to measure the surface roughness of a component correctly and accurately. This paper presents a method to remove the form and filtering process of surface texture for areal surface roughness measurement according to ISO 25178-2:2021. The S-filter is used to remove the system noise with suitable nesting index resulting in primary surface. The F-operator is applied to the primary surface to remove the form error by fitting the suitable polynomial which results in the S-F surface. Further, The L-filter is applied to the S-F surface to get the areal roughness surface. Additionally, these processes are explained using Zygo Mx software by considering some surface geometries such as spherical, cylindrical, and freeform.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 4","pages":"937 - 942"},"PeriodicalIF":1.3,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145646333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a Non-contact Respiratory Rate Measurement Method Considering Introduction of Rapid Response Systems","authors":"Shihoko Kajiwara,&nbsp;Naomi Akiyama,&nbsp;Takahiro Tamaki","doi":"10.1007/s12647-025-00842-w","DOIUrl":"10.1007/s12647-025-00842-w","url":null,"abstract":"<div><p>Respiratory rate is a critical parameter for activating rapid response systems. Given the limitations of existing respiratory rate measurement methods, we aimed to develop a simple, affordable, portable, non-contact, and automatic measurement device using commercially available optical components. We further verified its measurement accuracy through experiments involving a simulator and a volunteer. The proposed system consisted of a webcam with 10 infrared light-emitting diodes, a webcam arm stand, and a laptop. The system employed the law of light attenuation to assess changes in the distance between the camera and the body surface and then extracted depth information from two-dimensional images. In the simulator experiments, the Bland–Altman analysis revealed a bias of 0.167 between simulator settings and automatic system measurements, and 0.200 between simulator settings and visual measurements by a nurse. In the volunteer experiment, the bias between automatic system measurements and visual measurements by a nurse was 0.033. The results were satisfactory. The proposed method exhibits sufficient measurement accuracy for practical use in an individual with a stable respiratory state. Collectively, our findings suggest that the device could reduce observational burden on nurses and significantly improve recording rate of respiratory parameters.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 3","pages":"619 - 627"},"PeriodicalIF":1.3,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12647-025-00842-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AC/DC Transfer Features of Dissemination of Voltage Unit Including Long-Term Stability","authors":"Oleh Velychko,&nbsp;Valentyn Isaiev,&nbsp;Viktoriia Shvedova,&nbsp;Igor Pototskiy","doi":"10.1007/s12647-025-00832-y","DOIUrl":"10.1007/s12647-025-00832-y","url":null,"abstract":"<div><p>This article discusses the relationship between three characteristics of the quality of a measurement result, namely traceability, uncertainty, and stability. The presented annual stability investigation is based on the assumption of high long-term stability of the planar multi-junction voltage thermal converter, with which the AC/DC transfer standard under study is compared. To evaluate the qualitative aspect of the reproduction of the AC voltage unit for further dissemination, the relationship between the uncertainty of measurements and the difference between two estimates, separated in time by 1 year, was analyzed. To predict the random displacement of the reproducible volt unit, the presence of long-term drift of the hypothetical average AC/DC voltage transfer difference was also analyzed. To guarantee the quality of the performed assessment, three criteria of mathematical statistics were applied in the analysis of the presence of displacement trends.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 3","pages":"775 - 792"},"PeriodicalIF":1.3,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Leveraging the Aswal Model to Understand and Amplify the Impact of India’s National Education Policy","authors":"Dinesh K. Aswal,&nbsp;Anirudh Chandra","doi":"10.1007/s12647-025-00840-y","DOIUrl":"10.1007/s12647-025-00840-y","url":null,"abstract":"<div><p>India's ambitious initiative, “Viksit Bharat” (Developed India) by 2047, aims to transform the nation into a technologically advanced, economically robust, and socially inclusive society. Education stands as a central pillar of this vision. To ensure that quality education is accessible, equitable, and affordable for all, the National Education Policy (NEP) was introduced by the government in 2020, serving as a critical policy framework within the broader “Viksit Bharat” vision. While the NEP provides a comprehensive roadmap for India’s educational transformation, a unified approach to ensure systemic quality and stakeholder integration is lacking. To fill this gap, this paper introduces the Aswal Model—a quality infrastructure-based framework originally developed for science and innovation—as a conceptual tool to analyse and amplify the NEP’s impact. Rooted in the Quadruple Helix model of academia, industry, government, and civil society, the Aswal Model emphasizes the foundational role of metrology and quality infrastructure systems (QIS) in mediating stakeholder interactions. Using thematic analysis and policy documents, the study demonstrates how QI elements such as standardization, accreditation, and conformity assessment align with NEP’s elements, including core focus areas—Early Childhood Care and Education, Higher Education, and Vocational Education. By embedding QI principles into India’s education policy, the paper offers a novel interdisciplinary pathway for strengthening educational governance and knowledge generation. The findings contribute to both policy and metrology discourse by extending the application of quality infrastructure frameworks to education, providing actionable insights for regulators, technocrats, and institutional leaders.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 3","pages":"793 - 807"},"PeriodicalIF":1.3,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12647-025-00840-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of Liquid Dielectric Solution with 3D Printed Broadband Coaxial Transmission Line","authors":"Prachi Tyagi,&nbsp;Aijaz Ahmed,&nbsp;Asheesh Kumar Sharma,&nbsp;Satya Kesh Dubey","doi":"10.1007/s12647-025-00839-5","DOIUrl":"10.1007/s12647-025-00839-5","url":null,"abstract":"<div><p>This work presents the development of a methodology and software interface for the measurement of liquid dielectric constant based on the equivalent capacitance model. This work also presents the design and development of a novel coaxial probe with a 3D-printed transmission environment. The proposed coaxial probe is capable of working in the broadband frequency range from 500 MHz to 8.5 GHz. This probe, along with the developed software, leads to an indigenous solution for measuring the real-time electromagnetic parameters (i.e., permittivity, conductivity, and loss tangent) of liquids in a broad band frequency range. The complete setup is tested with the measurements of dielectric values of liquid and then compared and reported with the outcome of a commercially available software package and the actual target data. The measured results are comparable with the values obtained from commercial software as well as with the target data. Further, the measurement uncertainty was estimated to find out the tolerance limit, which is as per the IEC/IEEE 62209–1528:2020 standard (below ± 5%). This work is performed for the measurement and evaluation of dielectric properties in the frequency range of mobile communication, which includes 2G, 3G, 4G, and VoLTE.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 3","pages":"763 - 773"},"PeriodicalIF":1.3,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uncertainty Analysis in Z-Scan Spectroscopy: A Systematic Approach for Budget Estimation","authors":"Kaweri Gambhir,&nbsp;Parag Sharma,&nbsp;A. G. Vedeshwar,&nbsp;Ranjana Mehrotra","doi":"10.1007/s12647-025-00836-8","DOIUrl":"10.1007/s12647-025-00836-8","url":null,"abstract":"<div><p>Nonlinear optical phenomena and techniques challenge existing in-line metrology. In order to validate a wide range of classical and nonclassical photonic outcomes, it is now crucial to broaden the scope of metrological aspects which were initially confined to fundamental SI units. The conventional method to determine third-order nonlinear optical coefficients is Z-scan spectroscopy. Carbon Disulfide (CS₂) is the most extensively used reference material for various nonlinear optical setups including Z-scan spectroscopy. However, variation in the incident laser beam’s pulse duration drastically alters the nonlinear optical response of CS₂. Therefore, till date all the available literature quotes relative nonlinear optical coefficients of CS₂ and a consensus over the absolute nonlinearity of the reference material itself is missing. In order to overcome this limitation, the present article employs the Law of Propagation of Uncertainties (LPU/GUM) to establish a generic model to assess the uncertainties involved in the nonlinear absorption coefficient and nonlinear refractive index in the standard CS₂ solution using transmission mode <i>Z</i>-scan spectroscopy. This would not only help in expanding the bounds of nonlinear optical metrology but also permit assessment, comparison, and commercialization of the results obtained from different third-order nonlinear optical measurements.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"40 3","pages":"751 - 761"},"PeriodicalIF":1.3,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}