10 results on '"Chang, Suping"'
Search Results
2. Comparative study on aromatic thermosetting co-polyester (ATSP) coating and nickel-aluminum bronze on under torsional fretting wear
- Author
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Xu, Runzhou, Qin, Hongling, Zhai, Wenzheng, Chen, Xin, Lu, Wenlong, and Chang, Suping
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- 2020
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3. Ring-shaped single-electrode triboelectric nanogenerator (RSE-TENG) for energy harvesting and liquid flow rate monitoring of gas-liquid two-phase flow.
- Author
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Dong, Yang, Feng, Min, Cheng, Jiahui, Chang, Suping, Wang, Daoai, and Lu, Wenlong
- Abstract
Online measurement of liquid flow rate in high-speed gas-liquid two-phase flow remains a considerable challenge for practical engineering applications. Owing to the non-linear and non-smooth characteristics, it is not easy to achieve effective measurement of liquid-phase flow without separation of gas-liquid two-phase using conventional methods. An alternative, the solid/liquid-based triboelectric nanogenerator, has a great potential for self-powered sensing of liquid states. Herein, a ring-shaped single-electrode triboelectric nanogenerator (RSE-TENG) by combining contact electrification (CE) and electrostatic induction is designed for energy harvesting and parameter monitoring of gas-liquid two-phase flow. The RSE-TENG can achieve stable short-circuit current and open-circuit voltage peaks of 24 µA and 344 V, respectively. And a self-powered real-time liquid-phase flow monitoring system with a measurement range of 4–20 mL/min for gas-liquid two-phase flow is developed based on the RSE-TENG. It has the advantages of simple structure, low cost, fast response time, and can achieve effective non-contact measurement of liquid-phase flow without separation of gas-liquid two-phase. This measurement method based on the electric signal of triboelectricity at the solid-liquid interface can provide guidance and reference for the related research on fluid mechanics. [Display omitted] • A systematic study of the triboelectrification behavior of the high-speed gas-liquid two-phase flow with a solid surface was investigated. • Highlighting the feasibility of using the triboelectricity for parameters monitoring of the gas-liquid two-phase flow system. • Harvesting energy from high-speed gas-liquid two-phase flow in the transportation pipelines. • Proposing a self-powered liquid-phase flow monitoring system with a measurement range of 4-20 mL/min of gas-liquid two-phase flow. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Predicting running-in wear volume with a SVMR-based model under a small amount of training samples.
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Zhang, Gengpei, Wang, Jian, and Chang, Suping
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MECHANICAL wear , *SUPPORT vector machines , *SURFACE topography , *ARTIFICIAL neural networks , *FRICTION materials - Abstract
This paper proposes a support vector machine regression (SVMR) model to predict running-in wear volume, with field surface topography parameters and working conditions as the input variables, under the condition that the amount of training samples is very limited. Experimental results proved the effectiveness of the SVMR-based model with a small amount of training samples. Based on the established prediction model, the impacts of the field surface parameters on running-in wear volume have been analyzed. The results show that Sku has the largest influence on running-in wear volume, Sdq the second, and Svk the least. [ABSTRACT FROM AUTHOR]
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- 2018
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5. Improved zero-order fringe positioning algorithms in white light interference based atomic force microscopy.
- Author
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Hu, Chi, Liu, Xiaojun, Yang, Wenjun, Lu, Wenlong, Yu, Nengguo, and Chang, Suping
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ATOMIC force microscopy , *ALGORITHMS , *DISPLACEMENT (Mechanics) , *HILBERT transform , *WAVELET transforms - Abstract
In white light interference based atomic force microscopy (WLIAFM), the vertical displacement of the probe is obtained by zero-order fringe positioning on the probe cantilever, so the accuracy of zero-order fringe positioning will affect directly that of the WLIAFM. However, due to non-uniform distribution of light intensity and photoelectric noises, accurate zero-order fringe positioning becomes a problem. In this paper, two algorithms are proposed to improve the zero-order fringe positioning accuracy. In the first algorithm which is called improved maximum algorithm, multi-row maximum positions of the interference fringes are obtained and error theory is applied to eliminate erroneous maximum positions, then the average of remaining maximum positions is used as the zero-order fringe position. Another is called phase evaluation algorithm, in which wavelet transform is applied to eliminate effects from disturbances mentioned above and Hilbert transform is used for phase evaluation to obtain the zero-order fringe position. The practicability and accuracy of the two algorithms have been verified by series of experiments. The experiment results indicate that both two algorithms are suitable in this condition and the phase evaluation algorithm has higher accuracy while the improved maximum algorithm has higher processing speed. [ABSTRACT FROM AUTHOR]
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- 2018
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6. A novel surface recovery algorithm in white light interferometry.
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Lei, Zili, Liu, Xiaojun, Chen, Liangzhou, Lu, Wenlong, and Chang, Suping
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INTERFEROMETRY , *ALGORITHMS , *VIBRATION (Mechanics) , *COMPUTER simulation , *MEASUREMENT , *STATISTICAL correlation - Abstract
White-light interferometry (WLI) is an established method for surface measurement. In WLI, surface recovery algorithm from series of vertical scanning white light interferogram is pivotal technique and has been researched widely. However, the effectiveness of existing surface recovery algorithms is easy to be affected by some conditions like mechanical vibrations, low-reflection of the test surface and phase change caused by the reflection. In this paper, a new recovery algorithm is presented, in which correlation analysis of WLI envelop curves and a multi reference position based phase solution method are employed for robust and high precision surface recovery. Mathematical derivation of the algorithm is carried out, and simulation and experimental testing and comparison experiments are conducted, which show that the new algorithm is effective. [ABSTRACT FROM AUTHOR]
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- 2016
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7. Influence of cutting speed on fretting wear properties of UVAM-processed NAB alloy.
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Chen, Xin, Zhai, Wenzheng, Zeng, Wenhan, Sun, Lianjun, Dong, Song, Zheng, Kan, Wang, Jun, Lu, Wenlong, and Chang, Suping
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FRETTING corrosion , *MECHANICAL wear , *GRAIN refinement , *MARTENSITIC structure , *MATERIAL plasticity , *CRYSTAL grain boundaries - Abstract
In this study, NiAl bronze (NAB) alloys are processed using an ultrasonic vibration-assisted milling (UVAM) surface engineering technique. The strengthening mechanisms at different cutting speeds are analysed through well-established models and experiments. The increase in cutting speed produced decrements of 29.5%, 26.6%, and 5.6% in the friction torques, accumulated dissipated energy, and worn surface area, respectively. The microhardness gradually increased by 11%, which helped improve the fretting wear performance. Grain refinement, precipitation, and dislocation strengthening were the main mechanisms. Grain refinement (∆ σ HP) had the greatest contribution to performance, followed by precipitation (∆ σ or) and dislocation (∆ σ d). Nanotwin strengthening was observed at a cutting speed of 150 m/min. Martensite nanotwins may nucleate at the grain boundary and grow toward the grain interior. [Display omitted] • The increase of cutting speed leads to beneficial effects on their fretting behavior including friction torques, accumulated dissipated energy and worn surface area for 29.5%, 26.6% and 5.6%, respectively. • The refinement of the κ phases and the effects of dislocations and stacking faults help increase the hardness and mechanisms were analysed. • The formation of martensite phases in UVAM6000 was attributed to severe plastic deformation and the special 3R martensitic structures of NAB alloys. Specifically, martensite nanotwins may nucleate at the grain boundary and then grew toward the interior of grains. • Grain refinement, precipitate, and dislocation strengthening were the main mechanisms for all samples and its contributions were calculated through well-established models and experiment data. [ABSTRACT FROM AUTHOR]
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- 2022
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8. Additively manufactured (Fe, Ni)Al-reinforced nickel aluminum bronze with nearly-isotropic mechanical properties in build and transverse directions.
- Author
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Zhai, Wenzheng, Zhao, Yujie, Zhou, Runhua, Lu, Wenlong, Zhai, Wenchao, Liu, Xiaojun, Zhou, Liping, and Chang, Suping
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ALUMINUM bronze , *SPECIFIC gravity , *ISOTROPIC properties , *NICKEL , *ELECTRON beams , *ALUMINUM composites - Abstract
This work reports additive manufactured (Fe, Ni)Al-reinforced nickel aluminum bronze by the electron beam powder bed fusion (EB-PBF) method. All EB-PBF composites show a high relative density of >99% and a homogeneous microstructure with equiaxed grains and homogeneously distributed (Fe, Ni)Al precipitates, enabling their nearly-isotropic mechanical behavior in build and transverse directions. This isotropic mechanical behavior results from a collective effect of high relative density, homogeneously-distributed precipitates, equiaxed grains, and a subsequently sustainable strain-hardening ability from progressively twin-precipitate and dislocation-precipitate interactions. • (Fe, Ni)Al-reinforced nickel aluminum bronze is fabricated by electron beam powder bed fusion. • All built materials show a high relative density of >99% with nearly-equiaxed grains. • The built materials have isotropic mechanical properties in build and transverse directions. • The isotropic mechanical behavior is attributed to the outstanding sustainable strain-hardening ability. [ABSTRACT FROM AUTHOR]
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- 2022
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9. Design and characteristics of a new aerostatic bearing stylus sensor for surface measurement.
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Wu, Hao, Wang, Shuting, Xie, Yuanlong, Chang, Suping, and Zhao, Yanqing
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MAGNETIC control , *CRITICAL velocity , *FINITE difference method , *ELECTROMAGNETS , *DETECTORS - Abstract
• Double Magnetic coils controller to ensure a constant stiffness of 10 mm range. • Bearing capacity considering anti-deflection torque and stiffness. • Finite difference method combining mass flow theory and boundary conditions. • Dynamic characteristics and critical velocity verification. • 2D/3D texture parameters compared to a commercial conventional stylus profilometry. Stylus profilometry is extensively employed in practice due to its wide measurement range and praiseworthy stability. However, its lever structure will cause nonlinear errors and mitigated precision. Given this context, this paper proposes a new aerostatic bearing stylus sensor (ABSS) for surface measurement, which inherits the stability and large-scale measuring range while avoiding the structural nonlinear errors of the conventional stylus profilometry. The designed ABSS is composed of a magnetic levitation control system and an aerostatic bearing device in the vertical and horizontal directions, respectively. Furthermore, the bearing capacity and the radial dynamic characteristics are analyzed to ensure stylus' scanning stability and rapid response. Template experiments with different scanning velocities of the stylus are performed to verify the natural frequency and obtain the critical velocity. Finally, the surface two/three-dimensional topographies reconstruction validates the repeatability and accuracy of the proposed ABSS compared to a commercial conventional stylus profilometry. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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10. A coarse-to-fine denoising method for dynamic calibration signals of pressure sensor based on adaptive mode decompositions.
- Author
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Yao, Zhenjian, Liu, Xiaojun, Yang, Wenjun, Wang, Chenchen, and Chang, Suping
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PRESSURE sensors , *HILBERT-Huang transform , *SIGNAL denoising , *IMAGE denoising , *CALIBRATION , *ENERGY dissipation - Abstract
• A coarse-to-fine denoising method is proposed for improving the calibration signal quality. • An adaptive method is proposed for estimating the optimal mode number of VMD. • Two indicators are introduced to identify the relevant modes of decomposition results. Dynamic calibration is an essential way to characterize the measurement performance of pressure sensors under dynamic environment. However, it is difficult to guarantee the reliability of calibration results because the calibration signal is inevitably contaminated by noises. In this paper, a coarse-to-fine denoising method is proposed to improve the quality of calibration signals based on adaptive mode decompositions. Firstly, variational mode decomposition (VMD) is used to decompose the calibration signal into several band-limited intrinsic mode functions (BLIMFs). The optimal mode number is estimated based on their center frequency spacing and mutual information of BLIMFs. The coarsely denoised signal is then reconstructed by the relevant BLIMFs based on the ringing energy loss ratio indicator. Subsequently, the coarsely denoised signal is decomposed as a series of IMFs with empirical mode decomposition (EMD). By introducing a clustering indicator named as comprehensive weighted correlative degree, the ringing and trend IMFs are extracted for obtaining the finally denoised result. The performance of the proposed method is validated by both simulated and actual dynamic calibration signals. Results show that the SNR of denoised result with the proposed method is 33.91, which is obviously larger than that obtained by EMD (SNR = 25.03) and VMD (SNR = 22.67) for simulated signal. Furthermore, comparative experiments also demonstrate the superiority of the proposed method over the existing approaches in both denoising ability and signal integrity. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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