Article
Mechanics
Hassan Alavi, Abdolreza Ohadi
Summary: This study investigates the diagnosis of single and compound faults using gear condition indicators. The results indicate that the gear condition indicators are more suitable for assessing the overall health status of the gearbox, but have limited ability to detect fault types and decouple compound faults. Additionally, the design parameters of the gear transmission system significantly affect the efficiency of fault diagnosis.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Mechanical
Marcell Suranyi, Christian Reinbrecht, Hubert Huemer
Summary: This study focuses on detecting gear cracks in ultra low speed, high load planetary gears and proposes a new condition monitoring method to achieve the goal of detecting cracks and tracking crack propagation in differential gears under realistic test conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Runyu Lu, Pietro Borghesani, Robert B. Randall, Wade A. Smith, Zhongxiao Peng
Summary: This paper introduces a technique to reconstruct the gear fault forcing functions by removing transfer function effects. The technique applies a cepstrum-based operational modal analysis method to vibration signals, providing more accurate indication of faults and approximating the gear meshing forces.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Tiantian Duan, Aiqiang Zhang, Jing Wei, Yulin Peng, Zhike Peng
Summary: The crack in the planetary gear train will worsen the vibration of the transmission system. The complexity of the gear train structure and the different boundary conditions of the ring gear (including pin support constraint and outer rim constraint) make the existing research on crack morphology inadequate. Through crack growth tests and verification of theoretical crack morphology, the vibration characteristics are analyzed based on the obtained crack morphology and the established system-level dynamic model of the planetary gear train.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
Tiancheng Ouyang, Jinxiang Wang, Xiaoyu Mo, Yinxuan Li
Summary: In high-speed gear transmission, cavitation is easily caused by vibration, and gear with pitting or crack fault will experience more violent cavitation due to stronger vibration, posing potential safety risks. However, there is limited research on gear cavitation mechanism considering pitting and crack. This paper proposes a model that combines computational fluid dynamics and faulty gear dynamics to study the cavitation mechanism of faulty gear, which is considered to be innovative. The results show that gear faults have a greater impact on cavitation at high speeds, and factors such as rotational speed, pitting depth, and crack depth affect cavitation intensity and enhancement rate.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Xingkai Yang, Ming J. Zuo, Zhigang Tian
Summary: Early diagnosis of gearbox tooth cracks is crucial for preventing catastrophic failures. A method was proposed to analyze crack induced impulses, and two new condition indicators were developed for tooth crack diagnosis, showing effectiveness in assessing crack severity.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Energy & Fuels
Jae-Oh Han, Won-Hyeong Jeong, Jong-Seok Lee, Se-Hoon Oh
Summary: Due to strengthened environmental regulations worldwide, the automobile industry is shifting towards producing eco-friendly vehicles. Electric vehicles equipped with a two-speed transmission can optimize energy efficiency, improve performance at low speeds, and achieve maximum speed at high speeds.
Article
Engineering, Mechanical
Xiaoyu Mo, Jinxiang Wang, Liang Cheng, Tiancheng Ouyang
Summary: Cavitation erosion in gear transmissions, closely related to the damage on tooth surface, is currently under-studied. A computational fluid dynamics model is proposed in this study to predict tooth erosion by combining gear dynamics and two-phase flow simulations. The model considers vibration and cavitation, with gear displacement from a finite element model used as a boundary condition and moving mesh technology adapting the deformed fluid domain. The method is validated by experiments, and twelve different CERIs are used to estimate erosion on meshing surface, with the three most reasonable indicators identified.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Zhen Shan, Zhongqiu Wang, Jianhua Yang, Qiang Ma, Tao Gong
Summary: In this article, a method for diagnosing rolling bearing faults under varying speed is proposed, which can effectively extract weak fault features and diagnose them. The proposed method decomposes the signal into modal components using a novel time-frequency mode decomposition (TFMD) method and enhances the features of each modal component through feature fusion. Simulation and experimental results demonstrate the high accuracy and robustness of the TFMD in bearing fault diagnosis.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Mechanical
Akash Patel, Piyush Shakya
Summary: This article discusses the impact of cracks on gears, proposes a model for simulating crack propagation path, explores a method for handling non-stationary signals, and introduces a new state feature for severity level classification. The effectiveness of the simulation model is validated through experiments.
MECHANISM AND MACHINE THEORY
(2021)
Article
Automation & Control Systems
Xin Chen, Yu Guo, Jing Na
Summary: Synchronous averaging (SA) is a powerful signal processing tool that enhances the features of periodic events by suppressing nonsynchronous components. However, under random slip conditions, SA may not effectively enhance the features related to rolling element bearing (REB) faults. This article proposes two frameworks based on instantaneous angular speed (IAS) for synchronous averaging and introduces an improved negentropy indicator to characterize the richness of REB fault information. The effects of encoder resolution and structure damping factor on the waveform related to faulty REB are also studied. Simulation and experiment results demonstrate the effectiveness of the proposed schemes in enhancing the features of REB faults under random slip conditions.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Manufacturing
Kouji Matsuo, Yoshitomo Suzuki, Junichi Hongu, Daisuke Iba, Ichiro Moriwaki
Summary: This paper describes a method for inspecting gear nicks during the final assembly process of automotive transmissions. The method utilizes multi-scale time synchronous averaging and optimal filtering to ensure the quality of transmission gears by detecting abnormal noise caused by gear nicks. The proposed method has been implemented and tested on CVT units, proving its ability to detect and identify nicks that may be hard to discern subjectively. This method provides a reliable way to secure quality assurance against abnormal noise induced by gear nicks in transmission systems.
JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING
(2023)
Article
Multidisciplinary Sciences
Patrick Schlegel, Andreas M. Kist, Melda Kunduk, Stephan Duerr, Michael Doellinger, Anne Schuetzenberger
Summary: In voice research, understanding the relationship between vocal fold vibrations and resulting acoustic signals is important, especially in the context of voice disorders like functional dysphonia. This study found weak correlations between acoustic and glottal area waveform parameters, suggesting that other parameters and laryngeal dynamics should be further investigated for potential correlations to the acoustic signal.
Article
Engineering, Multidisciplinary
Yong Yao, Gui Gui, Suixian Yang, Sen Zhang
Summary: This paper proposes a novel machinery fault detection method based on recursive attention mechanism (RAM), which automatically estimates noise interference probability and gradually improves anti-noise diagnosis ability through multiple-stage attention module. Moreover, a domain adaption method is established to enhance the model's cross-domain ability for further improvement in anti-noise performance.
Article
Physics, Multidisciplinary
Mahtab Mehrabbeik, Ramesh Ramamoorthy, Karthikeyan Rajagopal, Fahimeh Nazarimehr, Sajad Jafari, Iqtadar Hussain
Summary: The variance indicator shows promising ability as a reliable early warning signal for anticipating changes in system dynamics. However, kurtosis and skewness indicators are less reliable due to their sensitivity to noise. Autocorrelation, while accurate, may lead to false-positives, reducing its reliability as an early warning signal for critical points. Proper data length in each bifurcation parameter is crucial for a more credible early warning signal.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2021)
Article
Engineering, Multidisciplinary
Sicheng Jiao, Shixiang Wang, Minge Gao, Min Xu
Summary: This paper presents a non-contact method of thickness measurement for thin-walled rotary shell parts based on a chromatic confocal sensor. The method involves using a flip method to obtain surface profiles from both sides of the workpiece, measuring the decentration and tilt errors of the workpiece using a centering system, establishing a unified reference coordinate system, reconstructing the external and internal surface profiles, and calculating the thickness. Experimental results show that the method can accurately measure the thickness of a sapphire spherical shell workpiece and is consistent with measurements of other materials.
Article
Engineering, Multidisciplinary
Rajeev Kumar, Sajal Agarwal, Sarika Pal, Alka Verma, Yogendra Kumar Prajapati
Summary: This study evaluated the performance of a CaF2-Ag-MXene-based surface plasmon resonance (SPR) sensor at different wavelengths. The results showed that the sensor achieved the maximum sensitivity at a wavelength of 532 nm, and higher sensitivities were obtained at shorter wavelengths at the expense of detection accuracy.
Article
Engineering, Multidisciplinary
Attilio Di Nisio, Gregorio Andria, Francesco Adamo, Daniel Lotano, Filippo Attivissimo
Summary: Capacitive sensing is a widely used technique for a variety of applications, including avionics. However, current industry standard Capacitive Level Sensors (CLSs) used in helicopters perform poorly in terms of sensitivity and dynamic characteristics. In this study, novel geometries were explored and three prototypes were built and tested. Experimental validation showed that the new design featuring a helicoidal slit along the external electrode of the cylindrical probe improved sensitivity, response time, and linearity.
Article
Engineering, Multidisciplinary
Kai Yang, Huiqin Wang, Ke Wang, Fengchen Chen
Summary: This paper proposes an effective measurement method for dynamic compaction construction based on time series model, which enables real-time monitoring and measurement of anomalies and important construction parameters through simulating motion state transformation and running time estimation.
Article
Engineering, Multidisciplinary
Hui Fu, Qinghua Song, Jixiang Gong, Liping Jiang, Zhanqiang Liu, Qiang Luan, Hongsheng Wang
Summary: An automatic detection and pixel-level quantification model based on joint Mask R-CNN and TransUNet is developed to accurately evaluate microcrack damage on the grinding surfaces of engineering ceramics. The model is effectively trained on actual micrograph image dataset using a joint training strategy. The proposed model achieves reliable automatic detection and fine segmentation of microcracks, and a skeleton-based quantification model is also proposed to provide comprehensive and precise measurements of microcrack size.
Review
Engineering, Multidisciplinary
Sang Yeob Kim, Da Yun Kwon, Arum Jang, Young K. Ju, Jong-Sub Lee, Seungkwan Hong
Summary: This paper reviews the categorization and applications of UAV sensors in forensic engineering, with a focus on geotechnical, structural, and water infrastructure fields. It discusses the advantages and disadvantages of sensors with different wavelengths and addresses the challenges of current UAV technology and recommendations for further research in forensic engineering.
Article
Engineering, Multidisciplinary
Anton Nunez-Seoane, Joaquin Martinez-Sanchez, Erik Rua, Pedro Arias
Summary: This article compares the use of Mobile Laser Scanners (MLS) and Aerial Laser Scanners (ALS) for digitizing the road environment and detecting road slopes. The study found that ALS data and its corresponding algorithm achieved better detection and delimitation results compared to MLS. Measuring the road from a terrestrial perspective negatively impacted the detection process, while an aerial perspective allowed for scanning of the entire slope structure.
Article
Engineering, Multidisciplinary
Nur Luqman Saleh, Aduwati Sali, Raja Syamsul Azmir Raja Abdullah, Sharifah M. Syed Ahmad, Jiun Terng Liew, Fazirulhisyam Hashim, Fairuz Abdullah, Nur Emileen Abdul Rashid
Summary: This study introduces an enhanced signal processing scheme for detecting mouth-click signals used by blind individuals. By utilizing additional band-pass filtering and other steps, the detection accuracy is improved. Experimental results using artificial signal data showed a 100% success rate in detecting obstacles. The emerging concepts in this research are expected to benefit radar and sonar system applications.
Article
Engineering, Multidisciplinary
Jiqiang Tang, Shengjie Qiu, Lu Zhang, Jinji Sun, Xinxiu Zhou
Summary: This paper studies the magnetic noise level of a compact high-performance magnetically shielded room (MSR) under different operational conditions and establishes a quantitative model for magnetic noise calculation. Verification experiments show the effectiveness of the proposed method.
Review
Engineering, Multidisciplinary
Krzysztof Bartnik, Marcin Koba, Mateusz Smietana
Summary: The demand for miniaturized sensors in the biomedical industry is increasing, and optical fiber sensors (OFSs) are gaining popularity due to their small size, flexibility, and biocompatibility. This study reviews various OFS designs tested in vivo and identifies future perspectives and challenges for OFS technology development from a user perspective.
Article
Engineering, Multidisciplinary
Yue Wang, Lei Zhou, Zihao Li, Jun Wang, Xuangou Wu, Xiangjun Wang, Lei Hu
Summary: This paper presents a 3-D reconstruction method for dynamic stereo vision of metal surface based on line structured light, overcoming the limitation of the measurement range of static stereo vision. The proposed method uses joint calibration and global optimization to accurately reconstruct the 3-D coordinates of the line structured light fringe, improving the reconstruction accuracy.
Article
Engineering, Multidisciplinary
Jaafar Alsalaet
Summary: Order tracking analysis is an effective tool for machinery fault diagnosis and operational modal analysis. This study presents a new formulation for the data equation of the second-generation Vold-Kalman filter, using separated cosine and sine kernels to minimize error and provide smoother envelopes. The proposed method achieves high accuracy even with small weighting factors.
Article
Engineering, Multidisciplinary
Tonglei Cao, Kechen Song, Likun Xu, Hu Feng, Yunhui Yan, Jingbo Guo
Summary: This study constructs a high-resolution dataset for surface defects in ceramic tiles and addresses the scale and quantity differences in defect distribution. An improved approach is proposed by introducing a content-aware feature recombination method and a dynamic attention mechanism. Experimental results demonstrate the superior accuracy and efficiency of the proposed method.
Article
Engineering, Multidisciplinary
Qinghong Fu, Yunxi Lou, Jianghui Deng, Xin Qiu, Xianhua Chen
Summary: Measurement and quantitative characterization of aging-induced gradient properties is crucial for accurate analysis and design of asphalt pavement. This research proposes the composite specimen method to obtain asphalt binders at different depths within the mixture and uses dynamic shear rheometer tests to measure aging-induced gradient properties and reveal internal mechanisms. G* master curves are constructed to investigate gradient aging effects in a wide range. The study finds that the composite specimen method can effectively restore the boundary conditions and that it is feasible to study gradient aging characteristics within the asphalt mixture. The study also observes variations in G* and delta values and the depth range of gradient aging effects for different aging levels.
Article
Engineering, Multidisciplinary
Min Li, Kai Wei, Tianhe Xu, Yali Shi, Dixing Wang
Summary: Due to the limitations of ground monitoring stations in China for the BDS, the accuracy of BDS Medium Earth Orbit (MEO) satellite orbits can be influenced. To overcome this, low Earth orbit (LEO) satellites can be used as additional monitoring stations. In this study, data from two LEO satellites were collected to improve the precise orbit determination of the BDS. By comparing the results with GPS and BDS-2/3 solutions, it was found that including the LEO satellites significantly improved the accuracy of GPS and BDS-2/3 orbits.