Article
Engineering, Electrical & Electronic
Lin Mei, Shuaiyong Li, Chao Zhang, Mingxiu Han
Summary: An adaptive signal enhancement method based on genetic algorithm optimized VMD and SVD is proposed in this study to address the low SNR issue in leak location in water-supply pipelines. Experimental results demonstrate that the proposed method is effective in reducing leak location errors.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Civil
Mohanaprasad Kothandaraman, Zijian Law, Morris A. G. Ezra, Chang Hong Pua, Uma Rajasekaran
Summary: This article proposes a leak detection method using wavelet packet adaptive ICA, which can eliminate the interference factors in leak signals and has shown good results in experiments.
WATER RESOURCES MANAGEMENT
(2022)
Article
Engineering, Electrical & Electronic
Yaru Yue, Chengdong Chen, Xiaoyuan Wu, Xiaoguang Zhou
Summary: This article proposes an effective method for denoising ECG signals, which combines the ensemble empirical mode decomposition (EEMD), empirical mode decomposition (EMD), and wavelet packet (WP) techniques. The ECG signal is decomposed using EEMD, and then the highest frequency component is decomposed using EMD for a second time, and the high frequency components obtained from the second decomposition are decomposed and reconstructed using WP for a third time. The processed signal components are then fused to obtain the denoised ECG signal. Various evaluation metrics such as signal-to-noise ratio (SNR), mean square error (MSE), root mean square error (RMSE), and normalized cross correlation coefficient (R) are used to assess the noise reduction algorithm.
IET SIGNAL PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Xiaojuan Han, Wanying Cao, Xiwang Cui, Yan Gao, Feng Liu
Summary: This article presents a plastic pipeline leak localization method based on wavelet packet decomposition and higher order cumulants. Hydrophone sensors are used to capture the acoustic signals generated by water leakage in the plastic pipe. The most suitable wavelet packet basis function for leak signals is obtained through comparison of various wavelet packet basis functions. The higher order cumulant method is used to estimate the time delay between the sensor signals and locate the leak hole. The results show that the higher order cumulant method has higher leak localization accuracy compared to other methods.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Civil
Hongjin Liu, Hongyuan Fang, Xiang Yu, Fuming Wang, Yangyang Xia
Summary: This study proposes an empirical mode decomposition and cross-correlation (EMDCC) method for water pipeline leak localization, which adaptively extracts effective leak signals from low signal-to-noise ratio (SNR) detection signals, and significantly improves the accuracy of localization.
Article
Engineering, Mechanical
Boxiang Liu, Zhu Jiang, Wei Nie
Summary: The study introduced an adaptive noise reduction method based on VMD, which gradually achieved denoising, extraction of effective signals, and reconstruction to enhance the accuracy of leak location.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Qiansheng Fang, Haojie Wang, Chenlei Xie, Jie Chen
Summary: This paper proposes a leak location method for water supply pipelines based on a multivariate variational mode decomposition algorithm, which can locate the leakage point more accurately with an average relative positioning error of less than 2.2%.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Ying Li, Lingzhi Qu, Baoxin Qi
Summary: This study investigates the feasibility of identifying the axial position of circumferential defects in laminated pipeline structures based on damage indices. Wavelet packet decomposition is combined with damage indices, and the effects of dual defects with different positions on damage indices are studied. The results indicate that the trend in damage index changes is influenced by the number of defects and the circumferential distance. This article demonstrates that the identification of the axial position of damage in laminated pipeline structures can be achieved using the damage index values in the damage index matrix.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Multidisciplinary
Yu-xing Li, Shang-bin Jiao, Xiang Gao
Summary: The article introduces a novel signal feature extraction technology based on EWT and RDE, which effectively extracts complex features of signals and improves signal separability and stability.
DEFENCE TECHNOLOGY
(2021)
Article
Engineering, Civil
Xinghao Tian, Wenling Jiao, Tianjie Liu
Summary: The low-pressure pipe network inside buildings without effective leak detection means has become the most vulnerable link in the urban gas infrastructure network. The study analyzes the steady-state hydraulic properties and conducts transient hydraulic analysis to identify leakage using the transient barotropic reflection wave. It also proposes an intelligent low-pressure gas pipeline leak detection method achieving stable and accurate leak identification.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2022)
Article
Physics, Multidisciplinary
Tiankai Sun, Xingyuan Wang, Kejun Zhang, Daihong Jiang, Da Lin, Xunguang Jv, Bin Ding, Weidong Zhu
Summary: In this paper, a new method of medical image authentication based on wavelet packet and energy entropy is proposed. The method measures the energy of detail information and mines local details to highlight valuable information. Experiments show that the method has good robustness against various attacks.
Article
Engineering, Multidisciplinary
Claudia Barile, Caterina Casavola, Giovanni Pappalettera, Vimalathithan Paramsamy Kannan
Summary: Signal-based acoustic emission data were analyzed in this research to identify damage modes in CFRP composites. Novel methodologies were introduced, and the 'dmey' wavelet was chosen for damage process identification through WPT, which showed consistent results with shifting in spectral density for characterizing damage modes.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Automation & Control Systems
Yulin Yan, Zhiyong Hu, Wenqiang Yuan, Jinyan Wang
Summary: A method for pipeline leak detection based on EMD and DBN is proposed, achieving higher recognition accuracy compared to TWSVM, SVM, and BPNN.
MEASUREMENT & CONTROL
(2023)
Article
Engineering, Electrical & Electronic
Xidong Zheng, Tao Jin
Summary: This paper proposes a method combining exponential smoothing short-term wind power forecasting with wavelet packet decomposition to improve the power allocation efficiency of HESS. By introducing the concept of standby storage and combining methods such as CEEMDAN, NEE, and NSE, the service life and reliability of HESS are enhanced.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2021)
Article
Chemistry, Analytical
Huaqing Xu, Tieding Lu, Jean-Philippe Montillet, Xiaoxing He
Summary: In this study, a new approach using improved variational mode decomposition and wavelet packet transform (IVMD-WPT) was proposed to enhance GPS signal extraction reliability. The algorithm, which utilizes energy entropy mutual information and grasshopper optimization, demonstrated superior noise reduction performance compared to traditional methods. This was confirmed through simulation experiments and analysis of real GPS height time series, showing significant improvements in RMSE, CC, and SNR values.
Article
Engineering, Environmental
Yue Sun, Lei Ni, Maria Papadaki, Wen Zhu, Juncheng Jiang, Chad Mashuga, Benjamin Wilhite, M. Sam Mannan
CHEMICAL ENGINEERING JOURNAL
(2019)
Article
Energy & Fuels
Lei Ni, Hang Yao, Xinyu Yao, Juncheng Jiang, Zhirong Wang, Chi-Min Shu, Yong Pan
Article
Engineering, Chemical
Xiangwen Wang, Zhirong Wang, Lei Ni, Ming Zhu, Chuipeng Liu
Article
Engineering, Chemical
Wei Jiang, Lei Ni, Juncheng Jiang, Qiang Chen, Zhiquan Chen, Shuliang Ye
Summary: This study utilized calorimetric and analytical techniques to evaluate the thermodynamics of the preparation of adipic acid through hydrogen peroxide oxidation, revealing possible macroscopic reaction pathways and the potential for catastrophic accidents if control is lost. The results indicate the need to improve inherent safety measures in order to scale up the reaction process.
Article
Thermodynamics
Qiang Chen, Lei Ni, Juncheng Jiang, Trent Parker, Zhiquan Chen, Zhen Cheng, Wei Jiang, Qingsheng Wang
APPLIED THERMAL ENGINEERING
(2020)
Article
Engineering, Mechanical
Xu Diao, Juncheng Jiang, Guodong Shen, Zhaozhao Chi, Zhirong Wang, Lei Ni, Ahmed Mebarki, Haitao Bian, Yongmei Hao
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Engineering, Chemical
Junjie Wang, Lei Ni, Jiawei Cui, Juncheng Jiang, Kuibin Zhou
Article
Engineering, Environmental
Zhen Cheng, Lei Ni, Junjie Wang, Juncheng Jiang, Hang Yao, Qiang Chen, Fusheng Cui, Wei Jiang, Shuliang Ye
Summary: In this study, the exothermic mechanism and process hazards of synthesizing Grignard reagents were investigated using calorimetry and infrared spectroscopy. It was found that using solvents such as 2-MeTHF, CPME, and DGBE can reduce the risk of the reactions, making them inherently safer options compared to traditional solvents like DE or THF.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Chemistry, Analytical
Hang Yao, Lei Ni, Peihong Wu, Juncheng Jiang, Yuqing Ni, Xinyu Yao
Summary: The pyrolysis characteristics of tetrazolo [1,5-a] pyridine were investigated using TG and DSC, determining the decomposition pattern and thermal safety parameters. Adiabatic conditions were studied using ARC, while TG-MS and DFT analyzed the decomposition pathways. The findings can aid in determining safety precautions for handling tetrazolo[1,5-a]pyridine.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Engineering, Chemical
Chenghao Li, Lei Ni, Qiang Chen, Juncheng Jiang, Kuibin Zhou
Summary: This study fabricated microencapsulated phase change materials with a melamine-formaldehyde resin shell, and investigated their application in controlling reaction temperature. Experimental results showed that the mechanism of these microPCMs was a combination of physical and chemical interactions. The use of microPCMs for controlling reaction temperature in industrial processes holds great potential.
Article
Chemistry, Multidisciplinary
Lanjuan Xu, Juncheng Jiang, Xinlei Jia, Yingying Hu, Lei Ni, Chao Li, Wenjie Guo
Summary: The study demonstrates that CNTs/PMMA composites exhibit excellent thermal stability and flame retardancy. The addition of CNTs can increase the initial decomposition temperature, reduce weight loss ratio, and improve LOI value. Additionally, the composites can form a stable interconnected network structure with flame retardant properties.
Article
Chemistry, Physical
Li Xia, Lei Ni, Yong Pan, Xin Zhang, Yuqing Ni
Summary: This study investigated the effects of H2SO4 and NaOH on the thermal decomposition of TBPTMH using thermal analysis methods. The results showed that the addition of acid and alkali increased the thermal hazard of TBPTMH. The characteristic parameters of its thermal decomposition and the control temperature under acid-alkali action were also determined.
Article
Engineering, Chemical
Yuying Zhang, Lei Ni, Hang Yao, Qiang Chen, Juncheng Jiang, Chi-Min Shu, Zhiquan Chen, Chenghao Li, Wen Zhu
Summary: In this study, the exothermic process and mechanism of TBPA synthesis were investigated using calorimetry, infrared spectroscopy, and high-performance liquid chromatography. Several sets of isothermal and isoperibol experiments were performed to evaluate the thermal risk of the reaction. The results showed that controlled heating and removal of water from the reaction are key factors for achieving high yield. The importance rating for this study is 8 out of 10.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Engineering, Chemical
Lei Ni, Dongyan Yang, Yinshan Liu, Chenghao Li, Qiang Chen, Juncheng Jiang, Yong Pan
Summary: Reaction thermal runaway accidents are common in chemical accidents. Controlling reaction temperature is crucial to improve the safety of chemical processes. Microencapsulated phase change materials can effectively control reaction temperature and enhance thermal safety.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Green & Sustainable Science & Technology
Yinshan Liu, Lei Ni, Hang Yao, Jimi Su, Zhen Cheng
Summary: The effects of sulfuric acid (H2SO4) and H2O2 stabilizer (EDTA) on the thermal hazard of H2O2 decomposition and the green synthesis of adipic acid were investigated in this study. Various calorimetry techniques were used to characterize the exothermic behavior of the reactions. An HPLC device was used to analyze the yield of adipic acid and the conversion rate of the raw materials. The addition of H2SO4 and EDTA reduced the exothermic heat of the reactions and increased the yield of adipic acid.
Article
Engineering, Chemical
Chao Chen, Hang Chen, Li Mo, Shenbin Xiao, Changjun Li, Ming Yang, Genserik Reniers
Summary: Fire-induced domino effect is a major threat to hazardous material storage tanks. Previous research neglected the impact of wind load on the thermal buckling behavior of tanks exposed to fire. This paper conducts a numerical simulation to analyze the synergistic effects of fire and wind loads on the thermal post-buckling behavior of storage tanks, considering wind parameters and heat radiation parameters.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Zhang Chu, Liu Lili, Li Wei, Li Beibei, Liu Mingxing
Summary: This study predicts the fatigue life of blasting discs using a combined simulation method and measures the deformation of conventional slotted blasting discs subjected to repeated loading using a high-precision laser scanning method. A relationship model is established between deformation, loading pressure, cycle number, and change in blasting pressure. The results show that the deformation varies linearly with the cycle number and follows a power function relationship with the change in blasting pressure. The deformation can be used to accurately predict the fatigue life of blasting discs.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Shin-Mei Ouyang, Jia-Chi Ye, Wei-Chun Chen, Yu-Jen Chen, Chin-Feng Chen
Summary: This study employed the Taguchi method and analysis of variance to investigate the factors that influence the deterioration of pyrotechnics when stored under different humidity and temperature conditions. Various experimental methods were used to study the microstructure, heat flow, and safety of the pyrotechnics. The results showed that humidity had a significant impact on the pyrotechnics, and controlling humidity could reduce the hazards associated with storing pyrotechnics.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Bei Li, Huiqiang Liu, Heng Gao, Chi-Min Shu, Mingshu Bi
Summary: The moisture content sprayed into the dust layer in industrial sites is a main factor affecting reignition. The study found that moisture has a certain influence on the thermophysical properties of the dust layer, playing an important role in heat transfer and heat absorption processes. The results showed that as the moisture content increased, the thermal conductivity and heat sink density of the sample increased, indicating the need to have a heat sink density higher than the heat increase value to suppress ignition.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Yue Jing, Yong Pan, Fan Yang, Dan Wei, Wenhe Wang
Summary: A comprehensive risk assessment method for the esterification process was proposed in this study. It established a comprehensive evaluation index system and utilized improved Dempster-Shafer evidence theory and cloud model for assessment. The method was validated through case studies and showed consistency with established indexes.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)