A5031407925- Spectroscopy and Chemometric Analyses
- Machine Fault Diagnosis Techniques
- Advanced Algorithms and Applications
- Advanced Numerical Analysis Techniques
- Remote Sensing and Land Use
- Piezoelectric Actuators and Control
- Particle accelerators and beam dynamics
- Gear and Bearing Dynamics Analysis
- Advanced Measurement and Metrology Techniques
- Industrial Vision Systems and Defect Detection
- Optical measurement and interference techniques
- Advanced Measurement and Detection Methods
- Advanced Vision and Imaging
- Video Surveillance and Tracking Methods
- Advanced machining processes and optimization
- Particle Accelerators and Free-Electron Lasers
- Engineering Diagnostics and Reliability
- Human Pose and Action Recognition
- Railway Engineering and Dynamics
- Iterative Learning Control Systems
- Blind Source Separation Techniques
- Hand Gesture Recognition Systems
- Magnetic Properties and Applications
- Infrared Target Detection Methodologies
- Advanced Condensed Matter Physics
Shenyang Jianzhu University
2014-2024
Penn State Milton S. Hershey Medical Center
2024
Nankai University
2020-2023
Southwest Jiaotong University
2020-2021
Dalian Maritime University
2018
Airbus (Germany)
2016
TU Wien
2016
Karlsruhe Institute of Technology
2016
Luxembourg Institute of Science and Technology
2016
Northeastern University
2011-2013
Introduction Road cracks significantly shorten the service life of roads. Manual detection methods are inefficient and costly. The YOLOv5 model has made some progress in road crack detection. However, issues arise when deployed on edge computing devices. main problem is that devices directly connected to sensors. This results collection noisy, poor-quality data. adds computational burden model, potentially impacting its accuracy. To address these issues, this paper proposes a novel algorithm...
Microvascular complications are the major outcome of type 2 diabetes progression, and underlying mechanism remains to be determined.
Abstract The digital twin model of full-life rolling bearings is great significance for the prediction its working condition. existing outputs simulation data, mainly considering two degrees freedom outer ring bearing; and it does not consider time series bearing vibration signal in virtual-real interaction process, which affects accuracy. In this paper, a six-degree-of-freedom proposed. First, dynamics established as means generating data that closer to real state bearing. Then improved...
Piezoelectric-actuated machine tools (PAMTs) exhibit nanoscale motion capabilities, with their S-shaped curve trajectory further enabling smooth path execution and reduced terminal pulse. However, the speed changes inherent in multi-order trajectories introduce an additional non-uniform creep difference (NCD), which differs significantly from conventional hysteresis effects. Traditional models are inadequate for addressing this mixed shape nonlinearity. To overcome limitation, paper proposes...
Piezoelectric ceramic actuators have been widely used in nanopositioning applications owing to their fast response, high stiffness, and ability generate large forces. However, the existence of nonlinearities such as hysteresis can greatly deteriorate accuracy manipulation, even causing instability whole system. In this article, we explained causes based on micropolarization theory proposed a piezoelectric deformation speed law. For this, analyzed actuator law domain wall theory. Based...
The hysteresis widely existing in piezoelectric ceramic actuators seriously affects the positioning accuracy practical applications. Based on microscopic displacement mechanism of actuators, this paper studied electrostrictive effect and inverse from polarization and, at same time, electric domain reversal ferroelectric effect. This clarified that are main causes for actuator. contribution microscopically is extremely weak can be ignored. shows relationship between voltage actuator linear,...
For a heavy-haul locomotive within wheel repairing period, polygonal wear with different operating mileages is obtained by field testing. The test results show that the maximum radial runout of can increase to 0.87 mm and accompany typical damage tread shelling. Taking polygons as input excitation, locomotive-track coupled dynamic model established, which verified comparisons calculated wheelset vertical acceleration in time frequency domains. variable wheel-rail friction coefficient...
Fault diagnosis of rolling bearings can effectively prevent sudden accidents and is an important factor for the safe operation mechanical systems. However, traditional time–frequency analysis techniques cannot obtain fault feature information. In this paper, a flat variational modal decomposition denoising method based on wavelet transform proposed to solve susceptibility vibration signal noise interference easily features. method, first, series mother wavelets with different periods are...
In order to monitor the rail base, dispersion characteristics and propagation properties of guided wave are studied. Firstly, two modes named as Modes V 1 2 selected by semianalytical finite element method (SAFE). The region at bottom edge can be monitored Mode , while junction base flange detected . Then, in process analyzed using (FEM). separated about 0.6 ms after they excited. Thirdly, a attenuation algorithm based on mean is proposed quantify attenuation. Both waves have weak within 5...
To effectively utilize a feature set to further improve fault diagnosis of rolling bearing vibration signal, method based on multi-fractal detrended fluctuation analysis (MF-DFA) and smooth intrinsic time-scale decomposition (SITD) was proposed. The signal decomposed into several proper rotation components by applying this new SITD overcome noise effects, preserve the effective signal-to-noise ratio. Wavelet embedded in iteration procedures (ITD). For better results, an adaptive threshold...
Tens of thousands work-related injuries and deaths are reported in the construction industry each year, a high percentage them due to workers not wearing safety equipment. In order address this issue, it is particularly necessary automatically identify people detect characteristics personnel at same time prefabricated building. Therefore, paper proposes depth feature detection algorithm based on Extended-YOLOv3 model. On basis YOLOv3 network, security recognition network transmission added...
Face masks can effectively prevent the spread of viruses. It is necessary to determine wearing condition in various locations, such as traffic stations, hospitals, and other places with a risk infection. Therefore, achieving fast accurate identification different application scenarios an urgent problem be solved. Contactless mask recognition avoid waste human resources exposure. We propose novel method for face recognition, which demonstrated using spatial frequency features from 3D...
The cold-cathode-type Penning ion gauge (PIG) source for the internal of KIRAMS-13 cyclotron has been used generation negative hydrogen ions. dc H-beam current 650μA from PIG with Dee voltage 40kV and arc 1.0A is extrapolated measured extraction beam currents at low voltages. output optimization in carried out by using various chimneys different sizes expansion gap between plasma boundary chimney wall. This paper presents results H-extraction measurement experiment.
For the hardcore processor such as DSP, existence of embedded speech recognition system taking more time on train and recognition, this paper presents an FPGA-based platform with principle vector quantization implementations. In using genetic algorithm for speaker systems, parallel hardware structure program can greatly reduce calculation time-consuming. After testing, implementation under premise ensuring rate, which effectively time-consuming training recognition.
Abstract The fault diagnosis method of bearing-rotor system based on infrared thermography can reflect the global information equipment, which is an advanced non-contact monitoring measure. Current methods focus analysis single-scale input images, and network only accepts fixed-size inputs. model not capable fusing multi-scaled features while processing single-scaled compression for size constraint will cause geometric distortion. This paper proposed a novel ReSPP (Residual Network with...
Recently, the engineering structural ceramics as friction and wear components in manufacturing technology devices have attracted much attention due to their high strength corrosion resistance. In this study, tribological properties of Si3N4/Si3N4 sliding pairs were investigated by adding few-layer graphene base lubricating oil on lubrication cooling under different experimental conditions. Test results showed that performance was obviously improved with addition at rotational speeds low...
Using response surface methodology, two-target parameter mathematical models for a 100MD60Y4 motorized spindle are established using biogeography-based optimization. Air supply pressure, fuel rate, and oil interval the independent variables, while temperature increase mist PM 2.5 cumulative volume distribution percentage variables. Biogeography-based optimization is used to find set of optimal lubrication system parameters with constraint small in at 30,000 r/min considering influence...
The nanopositioning stage with a piezoelectric driver usually compensates for the nonlinear outer-loop hysteresis characteristic of effect using Prandtl-Ishlinskii (PI) model under single-ring linear voltage, but cannot accurately describe characteristics inner-loop reciprocating voltage. In order to improve accuracy nanopositioning, this study designs double-parallel guiding mechanism. On basis classical PI model, firstly identifies rate tangent slope mark points, then segments and finally...
Abstract It is essential to obtain the five-degrees-of-freedom (5-DOF) error motion of a rotary table reconstructthe real trajectory rotating shaft, but there are many coupling problems when measuring table. In order improve measurement accuracy 5-DOF table, method motions based on bidirectional multi-point separation (BMPES) proposed. First, by analyzing characteristics with multiple degrees freedom during rotation, detection system double-layer structure probe arrangement designed. Then,...
Nanopositioning stages with piezoelectric actuators have been widely used in fields such as precision mechanical engineering, but the nonlinear start-up accuracy problem under open-loop control has still not solved, and more errors will accumulate, especially control. This paper first analyzes causes of starting from both physical properties materials voltages: are affected by material ceramics, magnitude voltage determines errors. Then, this adopts an image-only model data separated a...