Results 41 to 50 of about 496 (184)

Lyapunov-Based Control of the Sway Dynamics for Elevator Ropes with Time-Varying Lengths

IFAC Proceedings Volumes, 2014
In this work we study the problem of rope sway dynamics control for elevator systems, with time-varying rope lengths. We formulate this problem as a nonlinear control problem and propose nonlinear controllers based on Lyapunov theory for time-varying systems. We study the stability of the proposed controllers, and test their performances on a numerical
openaire   +1 more source

The Impact of Uncertainty on Forecasting the US Economy

Journal of Forecasting, EarlyView.
ABSTRACT This paper examines the predictive value of uncertainty measures for key macroeconomic indicators across multiple forecast horizons. We evaluate how different uncertainty proxies—economic policy uncertainty (EPU), VIX, geopolitical risk, and measures of macroeconomic and financial uncertainty—enhance forecast accuracy for industrial production,
Angelica Ghiselli
wiley   +1 more source

Vibration analysis of elevator rope with vibration suppressors (When vibration suppressors are uniformly installed or uniformly installed except for both ends part)

Nihon Kikai Gakkai ronbunshu, 2019
Vibration suppressors are used to change the natural frequency of an elevator rope and prevent resonance. The displacement of the parts of the elevator rope at both the ends is small compared to that of the center part of the rope; therefore, it is not ...
Hiroyuki KIMURA, Masafumi KAMIYA
doaj   +1 more source

Investigation of the influence of the length of the rope suspension of the bridge crane and the length of displacement of the cargo in the controlled sway mode on the time of displacement

Journal of Physics: Conference Series, 2019
Abstract The formulas for a complete analytical solution of the problem of moving cargo on a pendulum suspension of constant length along a given trajectory in a plane setting are presented. To set the desired trajectory as a time dependence of the linear horizontal coordinate of the cargo in a limited time interval, two-point Hermite ...
Mikhail S Korytov, Vitaly S Shcherbakov, Vladimir V Titenko   +2 more
openaire   +1 more source

A novel approach for in situ benthic habitat characterization

Limnology and Oceanography: Methods, EarlyView.
Abstract Habitat heterogeneity is a key driver of temporal and spatial variability of subtidal marine benthic biodiversity. However, this makes it a challenging environment in which to measure and quantify the factors driving biodiversity in a consistent manner.
Ryan J. W. Mathews, David K. A. Barnes, Simon A. Morley, Gareth Flint, Lloyd S. Peck   +4 more
wiley   +1 more source

Estimation of maximum displacement of elevator rope while car driving during earthquake using a single displacement sensor

Nihon Kikai Gakkai ronbunshu
During an earthquake, elevator operation is restricted by controlled operation because the elevator ropes resonate with the building sway. In this paper, based on the assumption that the elevator can operate even in the event of an earthquake if the ...
Ryoji NAKANISHI, Nanako MIURA, Tetsu OGAWA, Kazuhiro TANAKA, Taku YOSHIDA   +4 more
doaj   +1 more source

Free vibration analysis of a string with vibration suppressor located at center of the string (When there is a gap between string and vibration suppressor)

Nihon Kikai Gakkai ronbunshu, 2016
When an elevator rope for a high-rise building is forcibly excited by the displacements of the building induced by wind forces and/or by long-period ground motion, rope displacement becomes large even if the ground acceleration and the buildings ...
Hiroyuki KIMURA
doaj   +1 more source

Catchment conversion to agriculture alters freshwater macroinvertebrate community responses to flow disturbance: results from a replicated in‐stream experiment

Oikos, EarlyView.
Anthropogenic stressors often co‐occur in ecosystems, but their combined impacts are rarely assessed using field experiments. Press disturbances particularly can reshape community dynamics, altering their capacity to withstand or recover from acute pulse disturbances by modifying response diversity.
Bridget E. White, Anne Watson, Sean T. Atkinson, Belinda J. Robson, Russell G. Death, Mark J. Hovenden, Leon A. Barmuta   +6 more
wiley   +1 more source

Free vibration analysis of a string with vibration suppressor located at 1/N of the string (When N is an odd number)

Nihon Kikai Gakkai ronbunshu, 2016
A vibration suppressor is used to change the natural frequency of an elevator rope, and to prevent resonance. The elevator rope is modeled using a string. Linear string vibration is well known.
Hiroyuki KIMURA, Yuuki TAKIMAE
doaj   +1 more source

Enabling effective urban green space stewardship through planning: A qualitative comparative analysis in Southwest England

People and Nature, EarlyView.
Abstract Amid increasing urbanisation and biodiversity decline, ‘effective stewardship’ of urban green space (UGS) is a complex but critical nature‐based solution for long‐term environmental, social and economic gain. Combining stewardship and sense‐of‐place frameworks with European nature‐based solutions guidance, we investigate which social and ...
Fay Kahane, Melissa Ralph, Rosalind F. Shaw   +2 more
wiley   +1 more source