A5100631594- Piezoelectric Actuators and Control
- Aeroelasticity and Vibration Control
- Microfluidic and Bio-sensing Technologies
- Soft Robotics and Applications
- Acoustic Wave Resonator Technologies
- Advanced MEMS and NEMS Technologies
- Iterative Learning Control Systems
- Composite Structure Analysis and Optimization
- Innovative Energy Harvesting Technologies
- Ultrasound Imaging and Elastography
- Advanced Sensor and Energy Harvesting Materials
- Magnetic Bearings and Levitation Dynamics
- Advanced materials and composites
- Orbital Angular Momentum in Optics
- Electric Motor Design and Analysis
- Nanomaterials and Printing Technologies
- Micro and Nano Robotics
- Structural Analysis and Optimization
- Lightning and Electromagnetic Phenomena
- Robotic Mechanisms and Dynamics
- Fluid Dynamics and Heat Transfer
- Dielectric materials and actuators
- Vibration and Dynamic Analysis
- Acoustic Wave Phenomena Research
- Ultrasonics and Acoustic Wave Propagation
Nanjing University of Aeronautics and Astronautics
2013-2024
Xiangtan University
2024
China Nonferrous Metal Mining (China)
2022-2023
Beihang University
2018
Monash University
2016
Delft University of Technology
2015
Hong Kong Polytechnic University
2006-2011
National Synchrotron Radiation Research Center
2008
Xingtai University
2005
Abstract The shear performance of precast composite beams with stud connectors and detachable prefabricated high‐strength bolt are tested studied. A total 12 push‐out specimens were designed for tests, then the nonlinear finite element models two kinds different types developed. Results show that failure mode all is connectors, but load‐slip curves obviously different. It found stiffness higher, ultimate bearing capacity higher. For in this work, reduction caused by group nail effect not...
Molecularly defined cortical cell types have recently been linked to whole neuronal morphology (WNM), particularly those characterized by whole-brain-wide projections, such as intratelencephalic (IT), extratelencephalic (ET), and corticothalamic (CT) neurons. In contrast, classical morphological classifications (e.g., tufted TPC, small SPC, stellate SSC) are based primarily on local dendrosomatic axonal structures, especially apical dendrites. This study bridges these perspectives...
Based on near-field acoustic levitation, a noncontact bearing with spherical rotor was proposed to explore its potential application for novel supporting of suspended gyro. The stator the has hollow bowl-shaped configuration, in order produce levitation force object. Two orthogonal flexural standing waves were piezoelectrically generated and led traveling wave stator, then induced high-intensity sound air gap between could apply even driving rotor. In this article, finite element model...
Colorectal cancer is a serious threat to human health. Colonoscopy the most effective procedure for inspection of colorectal cancer. However, traditional colonoscopy may cause pain, which can lead patient's fear colonoscopy. The use active-motion robots expected replace procedures screening, without causing pain patients. This paper proposes an inchworm-like soft robot based on rubber spring. motion mechanism consists two anchoring units and elongation unit. unit driven by 3 cables during...
Representing a new approach to ultrasound generation and detection, study on piezoelectric micromachined ultrasonic transducers (pMUTs) has been growing research area in recent years. Intensive work directed the deposition of lead zirconate titanate (PZT) films silicon substrates for their excellent coefficients electromechanical coupling coefficients. However, high processing temperature required PZT crystallization results low device yield also makes it difficult integrate with control...
In this work, the performance evolution of a traveling wave type rotary ultrasonic motor (TRUM) in high-rotating environment is studied. The dynamic model stator TRUM centrifugal field established, and stiffening effect on caused by force described. Furthermore, warping deflection analyzed. It found to change original contact state decrease TRUM. between rotor established. Moreover, mechanism varying trend mechanical condition are Finally, test system set, at high angular velocities...
Theoretical and experimental studies for the creep mechanism at friction interface between rotor stator of traveling wave type rotary ultrasonic motors (TRUM) are performed in this work. A modeling method is developed to investigate distributed contact pressure piezoelectric composite with complex geometries. The annular laminated structure discretized into a semi-analytical plate element radial direction, teeth on top modeled by finite (FE) method. Then coupled approach continuous FE...
Non-contact ultrasonic motors (USM) show potential for future use, especially in the industrial fields because of its simple structure and quick response. It is therefore important to comprehensively understand their theoretical background so as push this research forward. In study, we shall fully explain deduce driving mechanism a linear levitation transporting system. Oscillation equations from initial exciting Langevin transducer flexural traveling wave propagation on guide were first...
We propose an innovative method for ship detection in the real marine environment. Different from other high-resolution optical images and synthetic aperture radar images, of coast defense is quite challenging due to complex background, sea state, low resolution. To this end, we build a dataset based on you only look once (YOLO) V4. Specifically, first, lightweight architecture MobileNetV3 introduced as backbone feature extractor accelerate speed by compressing parameters. Second, better...
Piezoelectric micromachined ultrasonic transducer (pMUT) consisting of a piezoelectric capacitor built on silicon membrane has been used for ultrasound transmitting and sensing. It typically operates at the fundamental flexural vibration frequency, where maximum sensitivity can be achieved, is insensitive higher order resonances because harmonic signals generated from different parts diaphragm tend to cancel with each other. This leads very narrow bandwidth. In this paper, rectangular-shaped...
By analyzing the contact mechanism between stator and rotor, this study demonstrates that prepressure on rotor is not a constant value because of structural stiffness preload structure. In addition, explains driving traveling wave ultrasonic motor under unsteady deduces dynamic model considering Furthermore, relationship speed characteristics structure obtained through simulation. The simulation results are found to be in good agreement with experimental results, which correctness model....
This paper presents a 10-b 500MS/s successiveapproximation-register (SAR) analog-to-digital converter (ADC) designed using 40nm CMOS process. The first 6-bit coarse conversion is completed by high speed loop-unrolled architecture, while the succeeding 5 bits are obtained traditional SAR structure. A foreground calibration employed to correct offsets in six comparators of converter, residual errors due process-voltage-temperature (PVT) variations covered 1-bit redundancy. background offset...
In this paper proposed an air bearing based on the mechanism of NFAL can levitate and position objects due to both a vibrating cylindrical stator two circular plates. A group piezoelectric ceramics is bonded surface acquire standing wave bending vibration resulting acoustic levitation, which provides radial non-contact support, actuators at ends housing also respectively be piezoelectrically excited waves provide axial support. Structural dynamics analysis simulation carried out for stators...
Transesophageal echocardiography (TEE) involves the use of an ultrasound transducer mounted at tip endoscope to make ultrasonic images human heart from esophagus. In conventional TEE probes, each element is wired-out by a micro-coaxial cable external imaging system. To obtain real-time three-dimensional images, however, two-dimensional array with more than 1000 elements required. Direct wiring so many through not feasible, channel reduction should be performed locally. this paper, we present...
This study proposes a spherical rotor gyroscope based on the near-field acoustic levitation (NFAL) principle, which utilizes high-frequency vibration to levitate objects at short distance near driving surface. The ultrasonic suspended consists of piezoelectrically excited stator and rotor. was generate under action inverse piezoelectric effect, provide non-contact support for rotor, drive it rotate with traveling wave vibration. When obtained sufficient angular momentum, voltages were...
The essay analyses overload characteristics of traveling wave type rotary ultrasonic motor. Establishing finite element model the Traveling Wave Type Rotary Ultrasonic Motor under impact load and using software (LS-DYNA) to simulate process motor in a large system. Researching bearing capacity according current structure Designing specific work-holding device machete hammer test resistance Motor. comparison theory analysis result can check correctness analysis.
High precision motion capture system has important significance for the research of control algorithm quadrotor. Focus on problem vibration caused by a large deviation when traditional PID appears velocity change, an incomplete differential ahead improved is proposed to design flight system. In order improve accuracy algorithm, introduced in this paper. The navigation and are carried out test platform built. simulation experimental results show that controller good stability tracking...