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Ensemble deep transfer learning driven by multisensor signals for the fault diagnosis of bevel-gear cross-operation conditions

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Science China(Technological Sciences) 2021年第3期64卷 481-492页

作者： DI ZiYang SHAO HaiDong xiang jiawei State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China College of Mechanical and Electrical Engineering Wenzhou UniversityWenzhou 325035China

The existing intelligent fault diagnosis techniques of bevel gear focus on single-sensor signal analysis under the steady operation *** this study,a new method is proposed based on ensemble deep transfer learning and multisensor signals to enhance the fault diagnosis adaptability and reliability of bevel gear under various operation ***,a novel stacked autoencoder(NSAE)is constructed using a denoising autoencoder,batch normalization,and the Swish activation ***,a series of source-domain NSAEs with multisensor vibration signals is ***,the good model parameters provided by the source-domain NSAEs are transferred to initialize the corresponding target-domain ***,a modified voting fusion strategy is designed to obtain a comprehensive *** multisensor signals collected under the different operation conditions of bevel gear are used to verify the proposed *** comparison results show that the proposed method can diagnose different faults in an accurate and stable manner using only one target-domain sample,thereby outperforming the existing methods.

关键词： ensemble deep transfer learning bevel-gear fault diagnosis novel stacked autoencoder multisensor signals modified voting fusion strategy

Wavelet-Based Boundary Element Method for Calculating the Band Structures of Two-Dimensional Phononic Crystals

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Acta Mechanica Solida Sinica 2021年第5期34卷 687-705页

作者： Qi Wei Xingfu Ma jiawei xiang College of Mechanical and Electrical Engineering Wenzhou UniversityWenzhou325035China

A wavelet-based boundary element method is employed to calculate the band structures of two-dimensional phononic crystals,which are composed of square or triangular lattices with scatterers of arbitrary cross *** the aid of structural periodicity,the boundary integral equations of both the scatterer and the matrix are discretized in a unit *** make the curve boundary compatible,the second-order scaling functions of the B-spline wavelet on the interval are used to approximate the geometric boundaries,while the boundary variables are interpolated by scaling functions of arbitrary *** any given angular frequency,an effective technique is given to yield matrix values related to the boundary ***,combining the periodic boundary conditions and interface conditions,linear eigenvalue equations related to the Bloch wave vector are *** numerical examples illustrate the superior performance of the proposed method by comparing with the conventional BEM.

关键词： Wavelet-based boundary element method B-spline wavelet on the interval Phononic crystal Band structure

Machinery fault diagnostic method based on numerical simulation driving partial transfer learning

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Science China(Technological Sciences) 2023年第12期66卷 3462-3474页

作者： LOU YunXia KUMAR Anil xiang jiawei College of Mechanical and Electrical Engineering Wenzhou UniversityWenzhou 325035China

Artificial intelligence(AI),which has recently gained popularity,is being extensively employed in modern fault diagnostic research to preserve the reliability and productivity of *** effectiveness of AI is influenced by the quality of the labeled training ***,in engineering scenarios,available data on mechanical equipment are scarce,and collecting massive amounts of well-annotated fault data to train AI models is expensive and *** response to the inadequacy of training samples,a numerical simulation-based partial transfer learning method for machinery fault diagnosis is ***,a suitable simulation model of critical components in a mechanical system is developed using the finite element method(FEM),and numerical simulation is performed to acquire FEM simulation samples containing different fault ***,several synthetic simulation samples are generated to form complete source domain training samples using a generative adversarial ***,the partial transfer learning network is trained to extract shared fault characteristics between the simulation and measured samples in the case of class ***,the resulting model is used to diagnose unknown samples from real-world mechanical systems in *** proposed method is tested on actual fault samples of bearings and gears obtained from a public dataset and experimental test rig available in our laboratory,achieving average classification accuracy of 99.54%and 99.64%,*** investigations reveal that the proposed method has superior classification and generalization ability when detecting faults in real mechanical systems.

关键词： finite element method generative adversarial network fault diagnosis partial transfer learning bearing gear

CONSTRUCTION OF WAVELET-BASED ELEMENTS FOR STATIC AND STABILITY ANALYSIS OF ELASTIC PROBLEMS

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Acta Mechanica Solida Sinica 2011年第4期24卷 355-364页

作者： Yongteng Zhong jiawei xiang School of Mechatronic Engineering Guilin University of Electronic TechnologyGuilin 541004China Aeronautical Key Lab of Smart Material and Structure Nanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China

Two kinds of wavelet-based elements have been constructed to analyze the stability of plates and shells and the static displacement of 3D elastic *** scaling functions of B-spline wavelet on the interval（BSWI） are employed as interpolating functions to construct plate and shell elements for stability analysis and 3D elastic elements for static mechanics *** main advantages of BSWI scaling functions are the accuracy of B-spline functions approximation and various wavelet-based elements for structural *** performances of the present elements are demonstrated by typical numerical examples.

关键词： wavelet-based element B-spline wavelet plate and shell stability 3D elastic problem

THE CONSTRUCTION OF WAVELET-BASED TRUNCATED CONICAL SHELL ELEMENT USING B-SPLINE WAVELET ON THE INTERVAL

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Acta Mechanica Solida Sinica 2006年第4期19卷 316-326页

作者： xiang jiawei He Zhengjia Chen Xuefeng School of Mechantronic Engineering Guilin University of Electronic Technology Guilin 541004 China School of Mechanical Engineering Xi＇an Jiaotong University The State Key Laboratory for Manufacturing Systems Engineering Xi ＇an 710049 China

Based on B-spline wavelet on the interval （BSWI）, two classes of truncated conical shell elements were constructed to solve axisymmetric problems, i.e. BSWI thin truncated conical shell element and BSWI moderately thick truncated conical shell element with independent slopedeformation interpolation. In the construction of wavelet-based element, instead of traditional polynomial interpolation, the scaling functions of BSWI were employed to form the shape functions through the constructed elemental transformation matrix, and then construct BSWI element via the variational principle. Unlike the process of direct wavelets adding in the wavelet Galerkin method, the elemental displacement field represented by the coefficients of wavelets expansion was transformed into edges and internal modes via the constructed transformation matrix. BSWI element combines the accuracy of B-spline function approximation and various wavelet-based elements for structural analysis. Some static and dynamic numerical examples of conical shells were studied to demonstrate the present element with higher efficiency and precision than the traditional element.

关键词： B-spline wavelet on the interval finite element method axisymmetric problem truncated conical shell element

An efficient wavelet finite element method in fault prognosis of incipient crack

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Science China(Technological Sciences) 2006年第1期49卷 89-101页

作者： CHEN Xuefeng HE Zhengjia LI Bing xiang jiawei School of Mechanical Engineering State Key Laboratory for Manufacturing Systems EngineeringXi'an Jiaotong UniversityXi'an 710049China

The method of constructing any scale wavelet finite element(WFE)based on the one-dimensional or two-dimensional Daubechies scaling functions was presented,and the corresponding WFE adaptive lifting algorithm was *** order to obtain the nested increasing approximate subspaces of multiscale finite element,the Daubechies scaling functions with the properties of multi-resolution analysis were employed as the finite ele-ment interpolating ***,the WFE could adaptively mesh the singularity domain caused by local cracks,which resulted in better approximate solutions than the traditional finite element *** calculations of natural frequencies of cracked beam were used to check the accuracy of given *** addition,the results of cracked cantilever beam and engineering application were ***,the current methods can provide effective tools in the numerical modeling of the fault prognosis of incipient crack.

关键词： crack fault prognosis wavelet finite element singularity

A hybrid multiple damages detection method for plate structures

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Science China(Technological Sciences) 2017年第5期60卷 726-736页

作者： JIANG YongYing xiang jiawei LI Bing CHEN XueFeng LIN LiQu School of Mechanical Engineering Xi'an Jiaotong University School of Mechanical Engineering Wenzhou University

A hybrid method is proposed to properly identify multiple damages for plate structures in this work. In the stage of damage localization, singular value decomposition （SVD） is applied to reveal singularities in modal shapes, and hence to detect the damage locations. In the stage of damage quantification, based on the detected location information ant colony optimization （ACO） algorithm is introduced to estimate damage severity by searching for damage evaluation database, which reveals the relationship between the natural frequencies and the damage severity. The modal shapes and the natural frequencies required in damage localization and quantification are obtained via the wavelet finite element method. The numerical simulation and experimental investigation are carried out to test the performance of the hybrid method for free aluminum plates with multiple damages. And the results indicate that the proposed method is effective to identify multiple damages of plate structures with reasonable precision.

关键词： plate singular value decomposition (SVD) ant colony optimization (ACO) damage detection hybrid method

Impact of the thermal effect on the load-carrying capacity of a slipper pair for an aviation axial-piston pump

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Chinese Journal of Aeronautics 2018年第2期31卷 395-409页

作者： Hesheng TANG Yaobao YIN Yan REN jiawei xiang Jun CHEN School of Mechanical Engineering WenZhou University School of Mechanical Engineering Tongji University Sany Heavy Industry Co. Ltd

A thermal hydraulic model based on the lumped parameter method is presented to analyze the load-carrying capacity of a slipper pair in an aviation axial-piston pump under specified operating conditions. Both theoretical and experimental results are presented to demonstrate the validity of the thermal hydraulic model. The results illustrate that the squeezing force and thermal wedge bearing force are the main factors that affect the film thickness and load-carrying *** high oil temperature and high load pressure, the film thickness decreases with increasing clamping force due to a combined action of the squeezing bearing force and the thermal wedge bearing force, but the load-carrying capacity will increase. An increase of the film thickness is proven to be beneficial under high shaft rotational speed but especially dangerous as it strongly increases the ripple amplitude of the film thickness, which leads to decreasing the load-carrying capacity. The structural parameters of the slipper can be optimized to achieve desired performance, such as the slipper radius ratio and orifice length diameter ratio. To satisfy the requirement of the load-carrying capacity, the slipper radius ratio should be selected from 1.4 to 1.8, and the orifice length diameter ratio should be selected from 4 to 5.

关键词： Aviation axial piston pumpFluid lubrication Load-carrying capacity Slipper pair Thermal effect

Construction and Application of Multivariable Finite Element for Flat Shell Analysis

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Acta Mechanica Solida Sinica 2018年第4期31卷 391-404页

作者： Xingwu Zhang Yanfei He Robert X. Gao Jia Geng Xuefeng Chen jiawei xiang State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China School of Mechanical Engineering Xi ' an Jiaotong University Xi ' an 710049 China Department of Mechanical Engineering Case Western Reserve University Cleveland OH 44106 USA Zhejiang Provincial Key Laboratory of Laser Processing Robot/Key Laboratory of Laser Precision Processing & Detection Wenzhou University Wenzhou 325035 China

Based on B-spline wavelet on the interval （BSWI） and the multivariable generalized variational principle, the multivariable wavelet finite element for flat shell is constructed by combining the elastic plate element and the Mindlin plate element together. First, the elastic plate element formulation is derived from the generalized potential energy function. Due to its excellent numerical approximation property, BSWI is used as the interpolation function to separate the solving field variables. Second, the multivariable wavelet Mindlin plate element is deduced and constructed according to the multivariable generalized variational principle and BSWI. Third, by following the displacement compatibility requirement and the coordinate transformation method, the multivariable wavelet finite element for fiat shell is constructed. The novel advantage of the constructed element is that the solving precision and efficiency can be improved because the generalized displacement field variables and stress field variables are interpolated and solved independently. Finally, several numerical examples including bending and vibration analyses are given to verify the constructed element and method.

关键词： B-spline wavelet on the interval Elastic plate Mindlin plate Flat shell Multivariable