A5034929505- Bladed Disk Vibration Dynamics
- Acoustic Wave Phenomena Research
- Advanced Surface Polishing Techniques
- Advanced machining processes and optimization
- Brake Systems and Friction Analysis
- Railway Engineering and Dynamics
- Aeroelasticity and Vibration Control
- Structural Health Monitoring Techniques
- Vibration and Dynamic Analysis
- Metallurgy and Material Forming
- Composite Structure Analysis and Optimization
- Ultrasonics and Acoustic Wave Propagation
- Microstructure and Mechanical Properties of Steels
- Vibration Control and Rheological Fluids
- Underwater Vehicles and Communication Systems
- Adhesion, Friction, and Surface Interactions
- Tribology and Lubrication Engineering
- Metamaterials and Metasurfaces Applications
- Tactile and Sensory Interactions
- Engineering Technology and Methodologies
- Advanced Machining and Optimization Techniques
- Hydraulic and Pneumatic Systems
- Aluminum Alloy Microstructure Properties
- Spine and Intervertebral Disc Pathology
- Laser and Thermal Forming Techniques
Aero Engine Corporation of China (China)
2017-2024
Beihang University
2015-2024
University of Science and Technology of China
2007-2024
Fudan University
2024
Xi'an Jiaotong University
2023
Jilin Medical University
2020
Jilin University
2020
National Natural Science Foundation of China
2020
Beijing Tian Tan Hospital
2020
Capital Medical University
2020
This paper deals with the design of periodic piezoelectric structures for broadband vibration control. By shunting identical negative capacitances to periodically distributed patches, a wide and continuous band gap is created so as cover frequency range interest. way modal density structure reduced shapes are localized at boundaries. A large proportion energy can then be removed or dissipated by small number dampers harvesters integrated within capacitance circuits. process proposed achieve...
As a promising numerical tool of structural dynamics in mid- and high frequencies, the wave finite element method (WFEM) is receiving increasingly attention applications. In this paper, an enhanced WFEM has been developed with reduced model new eigenvalue scheme. The applicable for structures piezoelectric shunts or local dampers; scheme can mitigate ill-conditioning when basis calculated. applied to thin-wall structure periodically distributed materials (PZT). Both free characteristics...
Synchronized Switch Damping (SSD) is a semi-active damping technology based on piezoelectric materials. It has advantages such as broadband and no need to tune. Despite the nonlinear governing equations, structures with SSD exhibit quasi-linear behaviour resonant frequencies hardly vary respect energy level of excitation. Inspired by these phenomena, in this paper we propose linearisation method for SSD, where force equivalent frequency-dependent viscous linear stiffness coefficients....
In this paper, we investigate the coupled band gaps created by locking phenomenon between electric and flexural waves in piezoelectric composite plates. To do that, distributed materials should be interconnected via a 'global' network rather than respective 'local' impedance. Once uncoupled wave has same wavelength opposite group velocity as wave, desired gap emerges. The Wave Finite Element Method (WFEM) is used to evolution of with respect propagation direction parameters. Further,...
In this article, a three-dimensional (3D) pen-like positioning system based on the high-precision 3D ultrasonic (US) method is presented. The US can achieve millimeter-level accuracy in within working area of 2 m × 1.5 m. order to improve real-time performance proposed system, an electronic pen realized by time-of-flight (TOF) detection dynamic threshold and average zero-crossing detection. overcomes limitations traditional that sensitive noise. high without conducting complex calculations....
The work aims to provide a further investigation of the dynamic characteristics an integral bladed disk (also called 'blisk') with Parallel Piezoelectric Network (PPN). PPN is constructed by parallelly interconnecting piezoelectric patches distributed in blisk. Two kinds are considered, namely mono-periodic and bi-periodic PPN. former has patch each sector, later one every few sectors. vibration suppression performance both been studied through modal analysis, forced response statistical...
This paper deals with a cyclic-periodic structure piezoelectric network. In such system, there is not only mechanical connection but also electrical between adjacent periodic sectors. The objective to learn whether the presence of network would change dynamic characteristics system. background research about vibration reduction bladed disk in an aero-engine, and system simulated by lumped parameter model. equations are derived, then analytical solution corresponding eigenvalue problem given....
In this work, we explore the feasibility of applying synchronized switch damping on negative capacitor damper to integrally bladed disks (blisks) by comparing its performance with that friction ring same added mass. Both dampers are coupled disk blisk. Namely, is in contact underside wheel and piezoelectric materials for bonded as well. The lumped parameter models used blisk dampers, multi-harmonic balance method employed obtain steady-state response under engine-order excitations....
In the authors’ previous work (MSSP 2017), we show that synchronized switch damping based on negative capacitor (SSDNC) is a good candidate for vibration suppression of tuned blisks. this paper, consider mistuned case and propose an efficient numerical approach to accelerate required statistical analysis. Although SSDNC type nonlinear piezoelectric damping, through in-depth modal analysis, information system remains unchanged with respect amplitude. Based this, accelerated component...
An enhanced SSDI (synchronized switch damping on inductor) approach is proposed to suppress the vibration of bladed disks in aero-engines. Different from authors’ former work (MSSP, 2017; JIMSS, 2018) where a local circuit shunted piezoelectric materials at each blade sector, this two sectors are interconnected by shared circuit. In way, switching action triggered relative displacement between sectors. The feasibility dual-connected numerically examined 2-DOF (degree-of-freedom) mechanical...
Study Design. A case control study. Objective. The aim of this study was to identify the potential impact cervical spine malalignment on muscle parameters. Summary Background Data. Muscular factors are associated with alignment. Nevertheless, only dimensions or imaging changes have been evaluated, function muscles has scarcely investigated. Methods. Thirty-four patients diagnosed as degeneration and 32 subjects were included in Visual analogue scale (VAS) neck disability index (NDI) used....