Diagnosis of engine fault is critical in reducing maintenance costs. A new method which incorporates hybrid relative vector machines and genetic algorithm (RVM-GA) was proposed to predict aero engine fault based on data of the spectrometric oil analysis. Experimental results show that it has a high accuracy and effective properties.

Aero engine

Relevance vector machine

10.4028/www.scientific.net/amr.998-999.1033

Cite

Citations (1)

Medical imaging and diagnosis of subpatellar vertebrae based on improved Laplacian image enhancement algorithm

Computer Methods and Programs in Biomedicine (2019)

Xiangdong Tian Jian Wang Dongfeng Du Shuwen Li Changxiao Han

Joint effusion

10.1016/j.cmpb.2019.105082

Cite

Citations (16)

HOSMD and neural network based adaptive super-twisting sliding mode control for permanent magnet synchronous generators

Energy Reports (2022)

Jiazheng Shen Xueyu Dong Jianzhong Zhu Chenxi Liu Jian Wang

To solve the maximum power tracking (MPT) control problem of the direct-driven wind power system, a super-twisting integral sliding mode controller with adaptive parameter estimation is designed. A high-order sliding mode differentiator is introduced as the virtual control variate filter, which solves the difficulty of obtaining the derivative of the control variate and the controller saturation in the nonlinear system with disturbances. Since the speed loop of permanent magnet synchronous generator (PMSG) is susceptible to disturbances, a radial basis function neural network (RBFNN) approximator and its adaptive algorithm are proposed to observe the unmodeled part of the system and external disturbances. In addition, the super-twisting algorithm is introduced to improve the robust performance. An improved adaptive parameter estimation algorithm is used to obtain real-time estimated values in the circumstances of uncertain stator parameters and parameters perturbation during operation, which enhances control accuracy and reduces undesirable chatting. The errors of RBFNN approximation and parameter estimation are taken into Lyapunov functions to guarantee the stability of the whole system. The effect of the proposed scheme is verified as compared to the adaptive backstepping terminal and new reaching law sliding mode controllers.

Differentiator

Lyapunov stability

10.1016/j.egyr.2022.04.049

Cite

Citations (9)

Adaptability Research of Rectangular Pattern for Hydraulic Fracturing in Low Permeability Reservoir

Science Technology and Engineering (2011)

Jian Wang

Hydraulic fracturing is an important stimulation technique for low permeability reservoir.Rectangular well pattern has some advantages,such as the high ratio of injection well to production well,high strength of injection water,it can improve the production and injectivity,so it is one of important well pattern in low permeability reservoir.The adaptability of rectangular pattern is studied.Therefore better development effect in low permeability reservoir can be obtained.Moreover the development effects are studied considering the change of ratio of fracture length to distance between wells and fracture conductivity under different well pattern.The results show that for the rectangle pattern with fixed well spacing,it is not necessary that larger well array,larger ratio of fracture length to distance between wells and lager flow conductivity will lead to better post fracture effect.Instead,there exists a reasonable range.

Adaptability

Rectangle

Source

Cite

Citations (0)

A novel conjugate gradient method with generalized Armijo search for efficient training of feedforward neural networks

Neurocomputing (2017)

Jian Wang Zhang Bingjie Zhanquan Sun Hao Wen-xue Qingying Sun

Backpropagation

Benchmark (surveying)

Feedforward neural network

Activation function

10.1016/j.neucom.2017.08.037

Cite

Citations (56)

Analysis on Fracture of Lining Plate of Microalloying High Mn Steel

Rejiagong gongyi (2002)

Jian Wang

The fracture reasons of lining plate of microalloying high Mn steel have been analyzed.The main reasons of fracture were unreasonable technologycal operation of casting and heat treatment.It is feasible that use this high Mn steel to produce lining plate so long as the forming and controling processes of materials are suitable.

Source

Cite

Citations (0)

Method of Correcting Digitized Topography Map by Using Geometric Constraint

Journal of Tongji University (2000)

Jian Wang

In this paper, we propose a new method to correct digitized topography map, by using geometric constraint based on the indirect adjustment. Householder transformation has been used for solving the error equations. At last corresponding mathematics models and results are given.

Geometric Modeling

Source

Cite

Citations (0)

From model to implementation: a network algorithm programming language

Science China Information Sciences (2020)

Jian Wang Jie An Mingshuai Chen Naijun Zhan Lulin Wang

C programming language

10.1007/s11432-019-2644-8

Cite

Citations (2)

Adaptive encryption of digital images based on lifting wavelet optimization

Multimedia Tools and Applications (2019)

Jian Wang Wenyuan Liu Shuai Zhang

10.1007/s11042-019-7704-3

Cite

Citations (15)