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In order to convert more vortex-induced vibration energy into electricity, a piezoelectric energy harvesting system using a modified circular cylinder is studied to evaluate its performance in water. The circular cylinder is often used to induce the Karman vortex street. To produce stronger and more regular vortices, a circular cylinder with a slit and concave rear surface is adopted in this paper...
Micromanipulation provides researchers a new way to fabricate complex structures through assembling small components, and it is also a useful tool for single cell manipulation. Many micromanipulation methods have been proposed, but only the few are capable of rotation of the micro targets. In this paper, we present a simple non-contact high-speed rotation method based on the local flow generated by...
In this article the vibration suppression of a beam under heavy fluid loading will be addressed. The main novelty of this study is suppressing the beam vibrations in contact to the fluid utilizing piezoelectric sensors and actuators. The piezoelectric sensors and actuators are attached to the beam and utilized to suppress the beam vibrations. In this study, the fluid has a free surface which complicate...
Mechanical seals are used to prevent leakage of hydraulic fluid in the seal cavity, and in the meantime prevent entry of external contaminants. It is widely used in hydraulic pumps, hydraulic motors and other rotating hydraulic devices. And therefore there are many different designs for mechanical seals to meet specific applications. Due to its superior performance, mechanical seals have been widely...
The article reviews the design of actuators of vibrations seismic sources, their advantages and disadvantages. The conclusion about the prospects of the elastic sheaths use is made.
This paper addresses the vibration control problem of a fuel transport system (FTS) in a nuclear power plant. The FTS transports the fuel rods in the nuclear reactor to desired locations within the fuel building. The fuel rods must be transported under water to avoid radiation leaks into the environment. It has been observed that a quick maneuver of the trolley can cause vibrations that can damage...
For the vibration of the aero pipeline and the conveying pipeline exists universally and the vibration has effects on the pipeline life, the detection accuracy and the system stability, the research on the natural characteristic of the pipeline vibration has promising prospects. In this paper, the vibration mathematical model is built with the simple and practical Rayleigh-Ritz energy method to calculate...
This paper addresses the vibration control problem of a fuel transport system (FTS) in a nuclear power plant. The FTS transports the fuel rods in the nuclear reactor to desired locations in the fuel building or vice versa. The fuel rods must be transported under water to avoid radiation leaks to the environment. It has been observed that a quick maneuver of the trolley can cause vibrations that can...
In order to study the dynamic characterization of a new type zero leakage valve with double direction, in this paper, we simplify the model of the new type zero leakage valve with double direction and establish a mathematical dynamic model of single degree of freedom torsion system. Based on the theory, the software of Adams was adopted to establish the dynamic model of virtual prototype, and the...
At present, energy harvesting from the widely existing fluid in the environment is a hot research field. Piezoelectric flags can be used to generate electric energy with the flow excitation for its positive piezoelectric effect. In this paper, the energy harvesting capacity of two piezoelectric flags in tandem arrangement in the uniform flow is analyzed through 2D numerical simulation. Identical vibration...
The Squeeze film damper has been extensively researched for engineering application. The conceptual design work in this article includes the description, induction and classification of the squeeze film damper structure, and a brief analysis of the structural features and performance characteristics. Then analytical expression of oil film force of typical local structure in hydrostatic feedback squeeze...
Slag carry-over detection technology (SCDT) is of important significance for steel continuous casting production (CCP), but has the problems with manufacture cost, service life, installation, and maintenance. Aiming at the problems, this paper brings forward a novel vibration style SCDT realization method based on simulated annealing artificial neural network (SA-ANN). According to ladle pouring process,...
Ride comfort is one of the main indexes of a comfortable vehicle, and engine mounts play an undeniable role in it. In this paper, a simplified model of an engine system is expressed to evaluate the performance of a semi-active MagnetoRheological (MR) engine mount and compare it with that of the passive Hydraulic Engine Mount (HEM) on which engine is originally mounted, to investigate if it is advantageous...
A new sectional lumped parameter model of Fluid-Structure Interaction (FSI) in fluid-filled pipes was presented based on the equivalent mechanical vibration model, which considers the Poisson coupling between the fluid and pipe structure; The model is fully decoupling by re-division of the fluid-filled pipe section and the rational allocation of compute nodes. The simulation results are in good agreement...
In recent years, the research and development of piezoelectric pumps have become an increasingly popular topic. Minimization, structure simplification and stronger output became the focus of piezoelectric pumps research due to its possible application in MEMS technology. The valveless fishtailing piezoelectric pump with rectangular vibrator, neither a volumetric nor a rotating pump, was invented according...
The characteristics of microcantilevers vibrating in the in-plane flexural mode (also known as lateral vibration) in viscous liquid media are investigated. A numerical model was utilized to determine a correction to Stokes' solution for an infinite plate to obtain an analytical expression for the hydrodynamic forces acting on a laterally vibrating microcantilever as a function of both Reynolds number...
To investigate the tail-slap loads on supercavitating projectiles, a simple model for cavity-fluid region is presented based on Logvinovich's Principle. And a series of simulations of fluid - structure interaction (FSI) were done to determine the effects of the slenderness ratio of projectiles on the tail-slap loads. The results show that the impact duration increases as the slenderness ratio increases...
This paper presents a numerical analysis study on active control of the fluid-structure coupled vibration of an infinite fluid-filled elastic cylindrical shell. Two types of propagating waves, i.e. breathing mode and beam mode, are considered as the disturbances. The radial force acting on the shell is used as the control input, and the radial displacements downstream of the control input are chosen...
This paper introduces the application of the viscoelastic dampers and analyses its working principle and performance in structural engineering, meanwhile the author gives a kinetic model which is suitable for structural analysis by referring to a concrete example, and compares the largest shear layer of the structure Dampers, and finally the author concludes that the systematic anti-quake of the structure...
Damping changeability design and evaluation is the most fundamental issue at the beginning of any new semi active hydraulic damper or its control system development. In this study, the changeable damping strategy for the sky-hook control of a rail vehicle semi-active hydraulic damper, which has three parallel orifices, is designed. Fluid formulae for the changeable damping calculation under different...
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