scholarly journals Quantifying and addressing uncertainties in empirical vibration attenuation relationship for underground blast by re-sampling

2019 ◽  
Vol 1 (11) ◽  
Author(s):  
Saha Dauji
Keyword(s):  
Attenuation Relationship ◽  
Underground Blast ◽  
Vibration Attenuation

Uncertainty Quantification of Vibration Attenuation with Shunted Piezo Patches

2019 ◽  
Author(s):  
Walid Larbi ◽  
Jean-François Deü ◽  
Roberta Lima ◽  
Rubens Sampaio
Keyword(s):  
Uncertainty Quantification ◽  
Vibration Attenuation

Effects of 3D printing variability on the vibration attenuation of metamaterial beams

2019 ◽  
Author(s):  
Adriano Todorovic Fabro ◽  
Danilo Beli ◽  
José Arruda
Keyword(s):  
3D Printing ◽  
Vibration Attenuation

Vibration attenuation of finite-size metaconcrete: Mechanism, prediction and verification

2021 ◽  
Vol 143 ◽  
pp. 106294
Author(s):  
Yang Liu ◽  
Xiyue An ◽  
Hailong Chen ◽  
Hualin Fan
Keyword(s):  
Finite Size ◽  
Vibration Attenuation

Vibration attenuation of a two-link flexible arm carried by a translational stage

2018 ◽  
Vol 24 (23) ◽  
pp. 5650-5664 ◽  
Author(s):  
Shang–Teh Wu ◽  
Shan-Qun Tang ◽  
Kuan–Po Huang
Keyword(s):  
Feedback Loop ◽  
Control Method ◽  
Flexible Manipulator ◽  
Closed Loop System ◽  
Flexible Arm ◽  
Vibration Attenuation ◽  
Shaft Encoder ◽  
High Frequency Vibrations ◽  
Spatial Derivatives ◽  
Derivatives Of

This paper investigates the vibration control of a two-link flexible manipulator carried by a translational stage. The first and the second links are each driven by a stage motor and a joint motor. By treating the joint motor as a virtual spring, the two-link manipulator can be regarded as an integral flexible arm driven by the stage motor. A noncollocated controller is devised based on feedback from the deflection of the virtual spring, which can be measured by a shaft encoder. Stability of the closed-loop system is analyzed by examining the spatial derivatives of the modal functions. By including a bandpass filter in the feedback loop, residual vibrations can be attenuated without exciting high-frequency vibrations. The control method is simple to implement; its effectiveness is confirmed by simulation and experimental results.

A metamodeling-based robust optimisation approach for structures subjected to random underground blast excitation

Structures ◽  
2021 ◽  
Vol 33 ◽  
pp. 3615-3632
Author(s):  
Gaurav Datta ◽  
Soumya Bhattacharjya ◽  
Subrata Chakraborty
Keyword(s):  
Robust Optimisation ◽  
Underground Blast

Optimized Design of Vibration Controllers for Steady and Transient Excitation of Flexible Rotors

1995 ◽  
Vol 209 (3) ◽  
pp. 155-168 ◽  
Author(s):  
P S Keogh ◽  
C Mu ◽  
C R Burrows
Keyword(s):  
Measurement Error ◽  
Controller Design ◽  
Optimized Design ◽  
Rotor Vibration ◽  
Transient Vibration ◽  
Flexible Rotors ◽  
Vibration Attenuation ◽  
Measured Displacement ◽  
Control Forces ◽  
Shaft Surface

Controller designs for the attenuation of rotor vibration are investigated. Disturbance inputs leading to vibration are classified and related to control forces and defined control states. Optimization based on the H∞ norm is then used to minimize the influence of forcing disturbances, modelling error and measurement error. The practicalities of applying the method to an experimental rotor-bearing system, with hardware constraints on controller order, are stated. The controller was implemented experimentally to conduct steady state and mass loss tests. Steady synchronous, non-synchronous and transient vibration attenuation was demonstrated. It was also shown that measurement error, caused by shaft surface roughness, can be incorporated into the controller design without the need to remove the roughness component from the measured displacement signals. If the roughness influence is not included in the design and the uncontrolled vibration is small, unnecessary control forces may result, causing an increase in vibration.

Preliminary Investigations of Machine Frame Vibration Damping Using Eddy Current Principle

2016 ◽  
Vol 821 ◽  
pp. 288-294 ◽  
Author(s):  
George Juraj Stein ◽  
Peter Tobolka ◽  
Rudolf Chmúrny
Keyword(s):  
Mathematical Model ◽  
Natural Frequency ◽  
Eddy Current ◽  
Asynchronous Motor ◽  
Oscillatory System ◽  
Vibration Damping ◽  
Combined Effects ◽  
Magnetic Forces ◽  
Novel Approach ◽  
Vibration Attenuation

A novel approach to vibration attenuation, based on the eddy current principle, is described. The combined effects of all magnetic forces acting in the oscillatory system attenuate frame vibrations and, concurrently, decrease the damped natural frequency. A mathematical model of the forces balance in the oscillatory system was derived before. Some experimental results from a mock-up machine frame excited by an asynchronous motor are presented.

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