A5100633278- Ultrasonics and Acoustic Wave Propagation
- Non-Destructive Testing Techniques
- Structural Health Monitoring Techniques
- Flow Measurement and Analysis
- Industrial Technology and Control Systems
- Gear and Bearing Dynamics Analysis
- Antenna Design and Analysis
- Advanced Algorithms and Applications
- Fault Detection and Control Systems
- Concrete and Cement Materials Research
- Machine Fault Diagnosis Techniques
- Advanced Measurement and Detection Methods
- Advanced machining processes and optimization
- Advanced Sensor Technologies Research
- Geophysical Methods and Applications
- Hydraulic and Pneumatic Systems
- Microstructure and Mechanical Properties of Steels
- Smart Materials for Construction
- Lubricants and Their Additives
- Antenna Design and Optimization
- Advanced Surface Polishing Techniques
- Welding Techniques and Residual Stresses
- Microwave Engineering and Waveguides
- Advanced Computational Techniques and Applications
- Industrial Vision Systems and Defect Detection
Chongqing University
2008-2024
PLA Academy of Military Science
2024
Institute of Oceanographic Instrumentation
2024
Shandong Academy of Sciences
2024
Qilu University of Technology
2024
Jimei University
2021-2023
Guilin University of Technology
2022
Alibaba Group (United States)
2020
Northwestern Polytechnical University
2020
China National Offshore Oil Corporation (China)
2018
Convolutional neural networks (CNN) represent a key application in data centers, which calls for accelerators that are: 1) efficient CNN computations; 2) having high throughput to be cost-efficient; and, 3) with adequate programming flexibility algorithm upgrades. Lacking of the availability such chip market, we designed our own. Matrix multiplication (MM) and convolution (CONV) are top-2 deep learning (DL) operations requiring intensive computation. Most existing accelerators, like GPUs...
We present a generic methodology for machinery fault diagnosis through pattern recognition techniques. The proposed method has the advantage of dealing with complicated signatures, such as those in vibration signals rolling element bearings and without defects. signature varies location severity bearing defects, load speed shaft, different housing structures. More specifically, technique contains effective feature extraction, good learning ability, reliable fusion, simple classification...
Accurate assessment and monitoring of axial stress during the service life bolt connection is great significance in ensuring stability reliability aerospace structure. The current acoustoelastic method requires both transverse longitudinal mode waves less sensitive to small-size bolts, resulting relatively larger errors evaluation stress. In this paper, an measurement with only a single longitudinal/transverse transducer for tightened bolts based on novel attenuation-based model introduced....
The reliability and stability of a mechanical system generally counts on the effective detection control stress state its bolted connections. In this paper, novel bolt axial evaluation method based scattering attenuation polycrystal using energy ratio multiple echoes is proposed. Above all, longitudinal-incident coefficients for preload cubic crystalline materials in Rayleigh regime are introduced. view estimation frequency-dependent prone to suffer from disturbance cylindrical guided waves,...
Precise evaluation of carburising heat treatment is necessary to avoid failure and degradation high-performance industrial mechanical components. In this work, a novel non-destructive detection method proposed for the deep carburised case depth (>2 mm) combining spatial ultrasonic backscatter technique linear regression model. To create various depths, three groups cylindrical 20CrMnMo steel samples were heat-treated in cycles (Carburising, diffusing, quenching at 850–870°C (holding range...
A new stress measurement method using single source high-frequency cylindrical guided waves is put forward to promote the efficiency and precision of contact-type ultrasonic testing technique. The propagation patterns acousto-elasticity waves, traveling in a loaded steel rod, are analyzed under theoretical framework Pochhammer-Chree equation nonlinear acoustics. According derivations, ratio maximum group velocities different modes selected as criterion stress. Then, calibration/measurement...
The detection of wear condition is critical for the prediction mechanical equipment failure and avoidance catastrophic accidents. A large-diameter inductive debris sensor was previously presented to satisfy requirement high throughput, characteristics induced voltage generated by single were analyzed. However, in practice, plenty particles carried lubricant flowing through sensors probably form aliasing signal, thus affecting evaluation concentration size particles. In order analyze...
In this work, we propose a novel coarse-to-fine method for object pose estimation coupled with admittance control to promote robotic shaft-in-hole assembly. Considering that traditional approaches locate the hole by force sensing are time-consuming, employ 3D vision estimate axis of hole. Thus, robots can target in both position and orientation enable shaft move into along orientation. our method, first, raw point cloud is processed acquire keypoints. Then, coarse extracted according...
Abstract Based on the scattering attenuation theory of loaded polycrystalline metals, a bolt axial stress measurement method using ultrasonic echo is proposed for problem that conventional time flight (TOF) difficult to measure high-strength short bolts. Firstly, coefficients body-centred cubic crystalline materials in Rayleigh range are described, and mathematical model between ratio peak two bottom echoes further derived. Then, effects transducer wafer diameter, mounting eccentricity...
There exist issues of ill-adaptability and low-accuracy in ultrasonic bolt stress measurement based on acoustic elasticity scattering attenuation. Therefore, a axial method ultrasound multi-feature fusion is proposed this paper. Firstly, characteristic parameters the theory are extracted, including difference time-of-flight (TOF) longitudinal wave attenuation coefficient polycrystalline materials within Rayleigh range. Then, following dimension reduction principle, TOF, coefficient, clamping...
Abstract The service life prediction of reinforced concrete (RC) structures in marine environment is essential structural repair and health monitoring. In this paper, a numerical model for predicting the first developed which considering time-varying boundary chloride concentration, critical concentration density corrosion current. Based on model, effects water–cement ratio, reinforcement diameter, cover thickness ion deterioration duration RC are investigated. key factors affecting...
Abstract A disposable miniature radiometer has been developed using optical filters for spectral separation. Limitations in accurately retrieving irradiance from the broad-band measurement results can be attributed to filters. This paper proposes an algorithm filter data (SIBOF algorithm) achieve precise retrieved through four correction steps. First, uses energy ratio method adjust narrow-band data. The is derived reference lamp spectrum and measured transmissivities. Second, corrects...
A fault diagnosis method based on EEMD and multi-class Logistic regression was proposed for various types of faults. First, the vibration signal is decomposed by method, then AR model established decomposition results. The autoregressive parameters residual variance are taken as feature vectors, which used input model. Then, basis binary classification model, established, were estimated gradient descent overcoming limitations Logistic. Finally, an example given to verify that can effectively...
The accurate estimation of axial stresses is a major problem for high-strength bolted connections that needs to be overcome improve the assembly quality and safety aviation structures. However, conventional acoustoelastic effect based on velocity-stress dependence very weak short bolts, which leads large errors. In this article, stress ultrasonic scattering attenuation investigated by calculating change in energy coefficient echoes after applying preload. Based effect, stress-dependent model...
In this paper, a novel parameter recognition method of mode-converted wave in single-source ultrasound is put forward and applied to the estimation axial stresses bolts. To overcome distortion aliasing ultrasonic signal, time-frequency based on Gabor transform introduced recognize accurate time flight (TOF) wave. Based mode conversion longitudinal ultrasound, new nonlinear evaluation model acoustoelastic equation derived determine stress bolt. The performance proposed evaluated by comparing...
This paper presents the design method of omnidirectional Lamb-wave electromagnetic acoustic transducers (EMATs) for ultrasonic Lamb wave tomography technique. The 360 degrees radiated A0 mode is excited through selection appropriate working point, which not only can realize large range detection plate structure, but also be more convenient to extract feature echo. travel time between transmitting and receiving EMATs measured using crosshole scanning method. Then slowness image reconstruction...
Traditional sensors for monitoring oil wear debris do not integrate the advantages of high sensitivity and large flow, limiting performance sensors. Thus, in this work, we design a sensitive large-flow sensor based on dual-excitation multi-induction structure. The finite element analysis (FEA) shown that impact width L-shaped magnetic poles (L-MPs) field is serious influence crosstalk among multiple medium-sized induction elements (MIEs) can be ignored. Therefore, our structure, short...
Machining of high-performance materials hitherto remains a major challenge in production. Cutting some those by the self-propelled rotary tool is evaluated this paper with respect to wear and life. Experimental results show that tool, characterized tangential motion circular cutting edge, enhances life far longer than conventional one turning metal-matrix composite. Crater hardly occurs titanium alloy high manganese steel. The inclination angle found be an important factor which controls...