This page has only limited features, please log in for full access.

Unclaimed
Pengxing Yi
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, China

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 18 January 2021 in IEEE Access
Reads 0
Downloads 0

The electromagnetic acoustic transducer (EMAT) is a powerful and useful non-destructive testing technology for structural health monitoring. However, EMAT has an issue of low efficiency in conversion and its signal is easily affected by noise, which make it difficult to accurately identify and evaluate structural defects. Thereby, signal de-noising preprocessing is essential for the evaluation of defects. In this paper, we proposed an improved singular value decomposition (SVD) de-noising method based on the fitting threshold for EMAT signal. For SVD de-noising method, the key point is to determine the singular value threshold for reconstructing the signal. We applied a segmented regression model to find the appropriate threshold in this approach. To investigate the efficacy of the proposed method, simulation signals and experimental signals are used for verification respectively. A comparative analysis has been under-taken to confirm that the proposed signal de-noising has advantages over other methods in EMAT signal noise reduction, and it is useful for more accurate evaluation of defects.

ACS Style

Biting Lei; Pengxing Yi; Jiayun Xiang; Wei Xu. A SVD-Based Signal De-Noising Method With Fitting Threshold for EMAT. IEEE Access 2021, 9, 21123 -21131.

AMA Style

Biting Lei, Pengxing Yi, Jiayun Xiang, Wei Xu. A SVD-Based Signal De-Noising Method With Fitting Threshold for EMAT. IEEE Access. 2021; 9 ():21123-21131.

Chicago/Turabian Style

Biting Lei; Pengxing Yi; Jiayun Xiang; Wei Xu. 2021. "A SVD-Based Signal De-Noising Method With Fitting Threshold for EMAT." IEEE Access 9, no. : 21123-21131.

Journal article
Published: 21 September 2020 in IEEE Sensors Journal
Reads 0
Downloads 0

Defect recognition plays an important part in the health monitoring of in-service equipment. Surface defects and sub-surface defects of key components have different effects on the safety of the equipment. Sub-surface defects are difficult to be identified, and it is more likely to cause unpredictable damage than surface defects. However, the existing characteristic cannot accurately identify the defect type. Therefore, it is critical to find features that are useful defect classification. The fusion of multiple feature values facilitates defect classification. For obtaining multi-feature fusion eigenvalues, this paper introduces a fusion matrix based on Fisher’s discriminant criterion and correlation analysis, which realizes the fusion of two dimensions of the whole and the local and different aspects. The BP neural network classifier is then used to discriminate and classify surface defects and sub-surface defects. The recognition accuracy of surface defects and sub-surface defects can reach 98.1%. The classification accuracy of this approach is significantly improved compared with the method based on a single feature value and other state-of-the-art methods. The approach can also be used to identify defects with different cross-sectional shapes, indicating that this approach is suited for nature defects.

ACS Style

Biting Lei; Pengxing Yi; Jiayun Xiang. A New Defect Classification Approach Based on the Fusion Matrix of Multi-Eigenvalue. IEEE Sensors Journal 2020, 21, 3398 -3407.

AMA Style

Biting Lei, Pengxing Yi, Jiayun Xiang. A New Defect Classification Approach Based on the Fusion Matrix of Multi-Eigenvalue. IEEE Sensors Journal. 2020; 21 (3):3398-3407.

Chicago/Turabian Style

Biting Lei; Pengxing Yi; Jiayun Xiang. 2020. "A New Defect Classification Approach Based on the Fusion Matrix of Multi-Eigenvalue." IEEE Sensors Journal 21, no. 3: 3398-3407.

Journal article
Published: 15 June 2018 in Sensors
Reads 0
Downloads 0

Pulsed eddy current (PEC) technology is another important non-contact nondestructive testing technology for defect detection. However, the temperature drift of the exciting coil has a considerable influence on the precision of PEC testing. The objective of this study is to investigate the temperature drift effect and reduce its impact. The temperature drift effect is analyzed theoretically and experimentally. The temperature drift effect on the peak-to-peak values of the output signal is investigated, and a temperature compensation method is proposed to reduce the effect of temperature variation. The results show that temperature drift has a negative impact on PEC testing and the temperature compensation method can effectively reduce the effect of temperature drift.

ACS Style

Biting Lei; Pengxing Yi; Yahui Li; Jiayun Xiang. A Temperature Drift Compensation Method for Pulsed Eddy Current Technology. Sensors 2018, 18, 1952 .

AMA Style

Biting Lei, Pengxing Yi, Yahui Li, Jiayun Xiang. A Temperature Drift Compensation Method for Pulsed Eddy Current Technology. Sensors. 2018; 18 (6):1952.

Chicago/Turabian Style

Biting Lei; Pengxing Yi; Yahui Li; Jiayun Xiang. 2018. "A Temperature Drift Compensation Method for Pulsed Eddy Current Technology." Sensors 18, no. 6: 1952.

Journal article
Published: 01 December 2017 in Sustainability
Reads 0
Downloads 0

Firms engaged in remanufacturing activities generally adopt more than one recycling channel to collect more used products and gain more profits. This paper explores the optimal strategies for a retailer-dominated closed-loop supply chain (CLSC) with a triple recycling channel in the construction machinery remanufacturing context. In this special system, the retailer is the leader and authorized by the original equipment manufacturer (OEM) to remanufacture. Moreover, the OEM, the retailer, and the secondary market all take part in the used products collection activities. Considering the differentiation of the OEM, the retailer, and the secondary market in collecting the used construction machinery, a mathematical model of the CLSC system based on reasonable assumptions is built, the closed-form optimal pricing decisions are derived, and the optimal collection efforts allocation strategies are explored within the framework of the game theory. In addition, the impacts of the reverse logistics cost coefficient, the competing coefficient, and the buy-back price coefficient on the supply chain performance are elaborately analyzed. These achievements provide decision makers with managerial insights and offer efficient guidelines for the construction machinery remanufacturing firms to solve similar puzzles.

ACS Style

Min Huang; Pengxing Yi; Tielin Shi. Triple Recycling Channel Strategies for Remanufacturing of Construction Machinery in a Retailer-Dominated Closed-Loop Supply Chain. Sustainability 2017, 9, 2167 .

AMA Style

Min Huang, Pengxing Yi, Tielin Shi. Triple Recycling Channel Strategies for Remanufacturing of Construction Machinery in a Retailer-Dominated Closed-Loop Supply Chain. Sustainability. 2017; 9 (12):2167.

Chicago/Turabian Style

Min Huang; Pengxing Yi; Tielin Shi. 2017. "Triple Recycling Channel Strategies for Remanufacturing of Construction Machinery in a Retailer-Dominated Closed-Loop Supply Chain." Sustainability 9, no. 12: 2167.

Research article
Published: 17 November 2016 in Frontiers of Mechanical Engineering
Reads 0
Downloads 0

Wind turbine gearbox (WTG), which functions as an accelerator, ensures the performance and service life of wind turbine systems. This paper examines the distinctive modal properties of WTGs through finite element (FE) and experimental modal analyses. The study is performed in two parts. First, a whole system model is developed to investigate the first 10 modal frequencies and mode shapes of WTG using flexible multibody modeling techniques. Given the complex structure and operating conditions of WTG, this study applies spring elements to the model and quantifies how the bearings and gear pair interactions affect the dynamic characteristics of WTGs. Second, the FE modal results are validated through experimental modal analyses of a 1.5 WM WTG using the frequency response function method of single point excitation and multi-point response. The natural frequencies from the FE and experimental modal analyses show favorable agreement and reveal that the characteristic frequency of the studied gearbox avoids its eigenfrequency very well.

ACS Style

Pengxing Yi; Peng Huang; Tielin Shi. Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine. Frontiers of Mechanical Engineering 2016, 11, 388 -402.

AMA Style

Pengxing Yi, Peng Huang, Tielin Shi. Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine. Frontiers of Mechanical Engineering. 2016; 11 (4):388-402.

Chicago/Turabian Style

Pengxing Yi; Peng Huang; Tielin Shi. 2016. "Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine." Frontiers of Mechanical Engineering 11, no. 4: 388-402.

Article
Published: 14 September 2015 in Journal of Intelligent Manufacturing
Reads 0
Downloads 0

In this paper, a modal interval based method is proposed to characterize the uncertainty in the quality of collected used products for a closed-loop supply chain. Triggered by an actual case in the construction machinery remanufacturing field, we establish a decent model of a remanufacturer-driven closed-loop supply chain with multi-dimensional reverse channel within the framework of game theory, which includes the supplier, the manufacturer, the retailer with authorization to remanufacture, and the third party collector. In this special remanufacturer-driven supply chain, both the retailer and the third party collector collect the used products for the remanufacturer. Considering the influence of uncertainty in the quality of used products on the buyback price and the cost of remanufacturing process, we utilize modal interval arithmetic to analyze the dynamic pricing and collection strategy of the remanufacturer. Moreover, to validate the effectiveness of the proposed modal interval based method, we compare it with the analysis under the traditional scenario based method. We confirm that the modal interval method can obtain more robust results, and the proposed model and method of our research can give guidance to the construction machinery remanufacturing firms when facing with the quality uncertainty of the collected used products in remanufacturing activities.

ACS Style

Min Huang; Pengxing Yi; Tielin Shi; Lijun Guo. A modal interval based method for dynamic decision model considering uncertain quality of used products in remanufacturing. Journal of Intelligent Manufacturing 2015, 29, 925 -935.

AMA Style

Min Huang, Pengxing Yi, Tielin Shi, Lijun Guo. A modal interval based method for dynamic decision model considering uncertain quality of used products in remanufacturing. Journal of Intelligent Manufacturing. 2015; 29 (4):925-935.

Chicago/Turabian Style

Min Huang; Pengxing Yi; Tielin Shi; Lijun Guo. 2015. "A modal interval based method for dynamic decision model considering uncertain quality of used products in remanufacturing." Journal of Intelligent Manufacturing 29, no. 4: 925-935.

Journal article
Published: 17 July 2015 in Sensors
Reads 0
Downloads 0

Characterizing a surface defect is very crucial in non-destructive testing (NDT). We employ an electromagnetic acoustic transducer (EMAT) to detect the surface defect of a nonmagnetic material. An appropriate feature that can avoid the interference of the human factor is vital for evaluating the crack quantitatively. Moreover, it can also reduce the influence of other factors, such as the lift-off, during the testing. In this paper, we conduct experiments at various depths of surface cracks in an aluminum plate, and a new feature, lift-off slope (LOS), is put forward for the theoretical and experimental analyses of the lift-off effect on the receiving signals. Besides, by changing the lift-off between the receiving probe and the sample for testing, a new method is adopted to evaluate surface defects with the EMAT. Compared with other features, the theoretical and experimental results show that the feature lift-off slope has many advantages prior to the other features for evaluating the surface defect with the EMAT. This can reduce the lift-off effect of one probe. Meanwhile, it is not essential to measure the signal without defects.

ACS Style

Kang Zhang; Pengxing Yi; Yahui Li; Bing Hui; Xuming Zhang. A New Method to Evaluate Surface Defects with an Electromagnetic Acoustic Transducer. Sensors 2015, 15, 17420 -17432.

AMA Style

Kang Zhang, Pengxing Yi, Yahui Li, Bing Hui, Xuming Zhang. A New Method to Evaluate Surface Defects with an Electromagnetic Acoustic Transducer. Sensors. 2015; 15 (7):17420-17432.

Chicago/Turabian Style

Kang Zhang; Pengxing Yi; Yahui Li; Bing Hui; Xuming Zhang. 2015. "A New Method to Evaluate Surface Defects with an Electromagnetic Acoustic Transducer." Sensors 15, no. 7: 17420-17432.

Journal article
Published: 09 December 2014 in Frontiers of Mechanical Engineering
Reads 0
Downloads 0

To improve the dynamic performance and reduce the weight of the planet carrier in wind turbine gearbox, a multi-objective optimization method, which is driven by the maximum deformation, the maximum stress and the minimum mass of the studied part, is proposed by combining the response surface method and genetic algorithms in this paper. Firstly, the design points’ distribution for the design variables of the planet carrier is established with the central composite design (CCD) method. Then, based on the computing results of finite element analysis (FEA), the response surface analysis is conducted to find out the proper sets of design variable values. And a multi-objective genetic algorithm (MOGA) is applied to determine the direction of optimization. As well, this method is applied to design and optimize the planet carrier in a 1.5MW wind turbine gearbox, the results of which are validated by an experimental modal test. Compared with the original design, the mass and the stress of the optimized planet carrier are respectively reduced by 9.3% and 40%. Consequently, the cost of planet carrier is greatly reduced and its stability is also improved.

ACS Style

Pengxing Yi; Lijian Dong; Tielin Shi. Multi-objective genetic algorithms based structural optimization and experimental investigation of the planet carrier in wind turbine gearbox. Frontiers of Mechanical Engineering 2014, 9, 354 -367.

AMA Style

Pengxing Yi, Lijian Dong, Tielin Shi. Multi-objective genetic algorithms based structural optimization and experimental investigation of the planet carrier in wind turbine gearbox. Frontiers of Mechanical Engineering. 2014; 9 (4):354-367.

Chicago/Turabian Style

Pengxing Yi; Lijian Dong; Tielin Shi. 2014. "Multi-objective genetic algorithms based structural optimization and experimental investigation of the planet carrier in wind turbine gearbox." Frontiers of Mechanical Engineering 9, no. 4: 354-367.

Journal article
Published: 22 October 2014 in Sensors
Reads 0
Downloads 0

The electromagnetic acoustic transducer (EMAT), a non-contact NDT tool with large lift-off, is becoming an attractive method for detecting the cracks in the metal parts. However, the lift-off of the transducer has a direct effect on the feature that is used to characterize the defects. A detailed investigation on the relationship between the feature and the lift-off of the EMAT is crucial in the detection process. This paper investigates the lift-off effect on the feature, cut-off frequency of EMAT in the Rayleigh wave. The study can be divided into two parts. Firstly, with a multi-field coupling environment, 2-D electromagnetic and wave generation EMAT models are built to simulate the interaction of the Rayleigh wave with the surface crack. Then, the lift-off effect on the cut-off frequency is investigated through simulation and experiment. Compared to the previous studies, it is found that lift-off would cause a negative result when the lift-off varies in the testing process. Besides, the calibration obtained from the tests at a random lift-off value can be used in other tests with any different lift off value provided that the lift-off is kept as a constant during the detection process.

ACS Style

Pengxing Yi; Kang Zhang; Yahui Li; Xuming Zhang. Influence of the Lift-Off Effect on the Cut-Off Frequency of the EMAT-Generated Rayleigh Wave Signal. Sensors 2014, 14, 19687 -19699.

AMA Style

Pengxing Yi, Kang Zhang, Yahui Li, Xuming Zhang. Influence of the Lift-Off Effect on the Cut-Off Frequency of the EMAT-Generated Rayleigh Wave Signal. Sensors. 2014; 14 (10):19687-19699.

Chicago/Turabian Style

Pengxing Yi; Kang Zhang; Yahui Li; Xuming Zhang. 2014. "Influence of the Lift-Off Effect on the Cut-Off Frequency of the EMAT-Generated Rayleigh Wave Signal." Sensors 14, no. 10: 19687-19699.