Results 51 to 60 of about 471 (183)

Study on vibration characteristics of mistuned bladed disk (Effect of bladed disk structure on mistuning characteristics)

Nihon Kikai Gakkai ronbunshu, 2019
Although bladed disks are nominally designed to be cyclically symmetric (tuned system), the vibration characteristics of all the blades on a disk are slightly different due to the manufacturing tolerance, deviations in the material properties, and wear ...
Yasutomo KANEKO, Asakichi MURAKAMI, Toshio WATANABE, Saiji WASHIO   +3 more
doaj   +1 more source

Performance of a simplified strategy for formula constant optimisation in intraocular lens power calculation

Acta Ophthalmologica, Volume 103, Issue 1, Page e10-e18, February 2025.
Abstract Purpose To investigate the performance of a simple prediction scheme for the formula constants optimised for a mean refractive prediction error. Methods Analysis based on a dataset of 888 eyes before and after cataract surgery with IOL implantation (Hoya Vivinex).
Achim Langenbucher, Jascha Wendelstein, Nóra Szentmáry, Alan Cayless, Peter Hoffmann, Guillaume Debellmaniere, Damien Gatinel   +6 more
wiley   +1 more source

Vibration Parameters Estimation by Blade Tip-Timing in Mistuned Bladed Disks in Presence of Close Resonances

Applied Sciences, 2020
The present paper is focused on the post processing of the data coming from the Blade Tip-Timing (BTT) sensors in the case where two very close peaks are present in the frequency response of the vibrating system.
Saeed Bornassi, Christian Maria Firrone, Teresa Maria Berruti   +2 more
doaj   +1 more source

A High Efficient Fluid-Structure Interaction Method for Flutter Analysis of Mistuned [PDF]

Xibei Gongye Daxue Xuebao, 2018
The time cost is very high by direct fluid-structure interaction method for mistuned bladed disk structures, so aerodynamic loads generally are ignored or treated as small perturbations in traditional flutter analysis.

doaj   +1 more source

Ultra‐Low Noise Figure Ka‐Band MMIC LNA With Graded‐Channel GaN HEMTs

Electronics Letters, Volume 61, Issue 1, January/December 2025.
We report broadband (20 GHz ‐ 40 GHz) low‐noise amplifiers in a cascode topology using graded‐channel GaN HEMTs, resulting in an excellent NF figure down to 1 dB with 15 dB gain per stage. ABSTRACT We report broadband (20 GHz ‐ 40 GHz) low‐noise amplifiers in a cascode topology using graded‐channel GaN HEMTs, resulting in an excellent NF figure down to
Joe Tai, Joel Wong, Jeong‐Sun Moon
wiley   +1 more source

Effectiveness of Straight‐Wall and Sloped‐Wall House Hold Water Tank Acting as a Tuned Liquid Damper in Mitigating Structural Vibrations: A Dynamic Assessment

Advances in Civil Engineering, Volume 2025, Issue 1, 2025.
This research distinguishes the performance of three types of water tanks, which are acting as tuned liquid dampers (TLDs; i.e., rectangular shape flat‐bottom with straight wall, square shape flat‐bottom with straight‐wall, and square shape flat‐bottom with sloped‐wall tanks) in the same plan area firmly fixed to the upper most part of the G+7 framed ...
Badrinarayan Rath, T. R. Praveenkumar, Ayana Debela, Keerat Kumar Gupta, Bijaya Mohanti, Prabhu Paramasivam, Rupesh Gupta, Mitiku Adare Tufa, Arnab Biswas   +8 more
wiley   +1 more source

An Innovative Semiactive Rolling Tuned Mass Damper for Structural Vibration Mitigation

Structural Control and Health Monitoring, Volume 2025, Issue 1, 2025.
This study introduces a novel semiactive rolling tuned mass damper (SARTMD) developed to mitigate structural vibrations more efficiently than conventional tuned mass dampers (TMDs), with a primary objective of significantly reducing absorber mass without compromising performance.
Shayan Mazloom, Amir K. Ghorbani-Tanha, Andrea Del Grosso   +2 more
wiley   +1 more source

Experimental Investigation of Synchronous-Flow-Induced Blade Vibrations on a Radial Turbine

International Journal of Turbomachinery, Propulsion and Power
In this study, a thorough experimental investigation of the synchronous blade vibrations of a radial turbine is performed for different IGV configurations. First, the blade modes are measured experimentally and calculated numerically.
Marios Sasakaros, Markus Schafferus, Manfred Wirsum, Arthur Zobel, Damian Vogt, Alex Nakos, Bernd Beirow   +6 more
doaj   +1 more source

Study on the Load‐Adaptive Control Method of Quasizero Stiffness Vibration Isolator Based on the Semi‐Analytical Solution

Shock and Vibration, Volume 2025, Issue 1, 2025.
For the quasizero stiffness (QZS) isolators, the mismatch between the stiffness and the load will significantly impact the vibration isolation performance, greatly reducing the isolation efficiency and complicating the load motion. Therefore, a load‐adaptive method is designed innovatively based on a semianalytical solution of the QZS isolator, which ...
Shuyan Xia, Dawei An, Daolin Xu, Yan Niu
wiley   +1 more source

Unsteady Aerodynamic Responses of Mistuned Cascade to Incoming Wakes. Mistuning of Stagger Angle.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1991
Unsteady aerodynamic responses of a mistuned cascade subjected to incoming wakes from an upstream cascade are investigated in this study, where the extended Nishiyama-Funazaki method is employed. Numerical calculations are made, focussing on the effects of stagger angle mistuning of the cascade. It is accordingly found that there is some possibility of
openaire   +3 more sources