- Structural Health Monitoring Techniques
- Ultrasonics and Acoustic Wave Propagation
- Composite Structure Analysis and Optimization
- Non-Destructive Testing Techniques
- Electromagnetic Compatibility and Noise Suppression
- Acoustic Wave Phenomena Research
- Mechanical Behavior of Composites
- Smart Materials for Construction
- Aeroelasticity and Vibration Control
- Electrostatic Discharge in Electronics
- Structural Analysis and Optimization
- Electromagnetic Compatibility and Measurements
- Silicon Carbide Semiconductor Technologies
- Analog and Mixed-Signal Circuit Design
- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Power Line Communications and Noise
- Smart Grid and Power Systems
- Topology Optimization in Engineering
- Composite Material Mechanics
- Vibration and Dynamic Analysis
- Power Systems and Technologies
- Advanced Computational Techniques and Applications
- Semiconductor materials and devices
- Structural Analysis of Composite Materials
Ningbo University
2011-2024
Nanjing Normal University
2009-2024
East Asia School of Theology
2021
Southeast University
2012
Fudan University
2009
Zhejiang University
2004-2008
United States Government Accountability Office
2003
With the escalating demand for power-efficient neural network architectures, non-volatile compute-in-memory designs have garnered significant attention. However, owing to nature of analog computation, susceptibility noise remains a critical concern. This study confronts this challenge by introducing detailed model that incorporates factors arising from both ADCs and RRAM devices. The experimental data is derived 40nm foundry test-chip, wherein different reference voltage configurations are...
An overview of recent advances in electromechanical impedance- (EMI-) based structural health monitoring is presented this paper. The basic principle the EMI method to use high-frequency excitation sense local area a structure. Changes impedance indicate changes structure, which turn that damages appear. accurate model on reverberation-ray matrix introduced correlate signatures physical parameters structures for damage detection. Comparison with other numerical results and experimental data...
Electro-mechanical impedance (EMI) is very effective for detecting the local incipient damages including small cracks in structures and has been validated by many experimental investigations. Meanwhile, some analytical models have proposed to deal with dynamics of health monitoring. However, there little work done relate EMI signatures crack parameters at ultrasonic frequencies. In this paper, a modified model combining technique reverberation matrix method (RMM) quantitatively correlate...
Abstract High‐frequency structural analysis so far has been a major issue in dynamic analysis, for which many conventional methods such as finite element method and transfer matrix are unable to perform well. Since the electromechanical impedance technique health monitoring (SHM) operates at very high frequencies, reverberation (RMM), was just developed few years ago, is employed study dynamics of monitored structures, bonded with piezoelectric lead zirconate titanate (PZT) patches. A...
This paper focuses on delamination detection of laminated beams using electromechanical impedance (EMI) signatures, which are directly related to the mechanical structure. An accurate model beam including a introduced inside as well installed PZT transducers is established. In model, we consider dynamic behavior piezoelectric patches presence bonding imperfection Kelvin-type viscoelastic interface. order develop recursive formulations reduce size final equations in method reverberation-ray...
This paper introduces a multilevel converter topology with common flying capacitors shared by phases. The unique feature of this configuration makes contribution to reduce the total number components like switching devices and capacitors, which is closely related cost volume. Therefore, low high power density are expected be achieved. A three-phase 5-level converter, regarded as minimum system proposed topology, analyzed for operational principle explanation verification. Simulation study...
The electro-mechanical impedance (EMI) method has been demonstrated to be a powerful tool detect the small local damages in various engineering structures, due its high-frequency vibration characteristics. However, this technique is difficult accurately determine degree and location of structural damages. In paper, an inverse analysis combining measured EMI signatures Transfer Matrix Method (TMM) proposed identify steel rods. A milled groove introduced into each specimen simulate damage. By...
The time-dependent behavior of a simply-supported functionally graded beam bonded with piezoelectric sensors and actuators is studied using the state-space method. creep bonding adhesives between layers characterized by Kelvin-Voigt viscoelastic model, which practical in high temperature circumstance. Both host elastic are orthotropic state plane stress, former being inhomogeneous along thickness direction. A laminate model employed to approximate beam. Moreover, coupling effect deformation...
An improved switched-capacitor bandgap reference with a continuous output voltage of 1.26 V has been implemented Chartered 0.35-μm 5-V CMOS process. The offset voltage, induced by non-ideal characteristics operational amplifier and bias current generator, is suppressed the proposed sample-and-hold circuit self-bias technique. Experimental results show that operates properly under supply varying from 3 to 5 V. measured temperature coefficient 112 ppm/°C power rejection ratio without any...
An analytical model of a cracked functionally graded beam with attached Lead Zirconate Titanate (PZT) actuator/sensors is proposed in the paper for structural health monitoring. In this model, dynamic behavior piezoelectric patches considered and viscoelastic law adopted to describe bonding imperfection between beam. A piecewisely homogeneous then employed approximate original inhomogeneous based on Timoshenko theory. The crack treated as massless rotational spring. order develop recursive...
Free vibration and dynamic responses of piles semi-rigidly connected with the superstructures are investigated. Timoshenko beam theory is employed to characterize pile partially embedded in a two-parameter elastic foundation. The formulations for method reverberation-ray matrix (MRRM) then derived investigate dynamics surface cracks, which modeled as massless rotational springs. Comparison existent numerical experimental results indicates proposed very effective accurate analysis, especially...
A hybrid method combining electro-mechanical impedance (EMI) technique and artificial neural network (ANN) is proposed to detect damages in structural systems. The members are treated as Timoshenko beams for flexural motion well the modeled by changes Young's modulus damaged area. For a member with surface-bonded PZT wafers, coupled system considered. Based on this model, EMI signatures extracted from wafers can be used identify system. Then, some kinds of compressed data employed ANN input...
A multilevel converter topology with common flying capacitors (CFC) was proposed recently. It has the advantage that fewer components are required, thus lower cost and higher power density possible to be realized. However, due circuit shared among different phases, voltage level skips easy caused, which will make system suffer surge could a threat insulation. Especially in motor drive application, costly output filter is always used protect from impact of skip. In order solve this issue...