scholarly journals Dynamic balance and wear conditions of an conic wind turbine with an inclined axis

2020 ◽  
Vol 51 ◽  
pp. 1-6
Author(s):  
A. Geguchadze ◽  
B. Zivzivadze ◽  
Z. Geguchadze ◽  
A. Kuparadze
Keyword(s):  
Wind Turbine ◽  
Dynamic Balance

The Effects of Static and Dynamic Imbalance on a Horizontal Axis Wind Turbine

1997 ◽  
Vol 119 (3) ◽  
pp. 261-262 ◽  
Author(s):  
J. P. Borg ◽  
R. H. Kirchhoff
Keyword(s):  
Wind Turbine ◽  
Dynamic Balance ◽  
Turbine Rotor ◽  
Horizontal Axis ◽  
Angular Velocity Vector ◽  
Mass Model ◽  
Horizontal Axis Wind Turbine ◽  
Dynamic Balancing ◽  
Definition Of ◽  
Wind Turbine Rotor

In this note the differences between static and dynamic balancing of a wind turbine rotor are addressed. The paper begins with a definition of each type of balancing. It is demonstrated that even if a horizontal axis wind turbine rotor is in static balance, the rotor can still be dynamically imbalanced. Dynamic imbalance can result in a yaw and/or teeter producing torque. A turbine rotor is only in a state of dynamic balance when the principle axes of inertia are aligned with the angular velocity vector. This criteria is illustrated with a point mass model.

Use of Vestibular Rehabilitation in the Pediatric Population

2019 ◽  
Vol 4 (6) ◽  
pp. 1399-1405 ◽  
Author(s):  
Jennifer Christy
Keyword(s):  
Pediatric Population ◽  
Dynamic Balance ◽  
Vestibular Rehabilitation ◽  
Rehabilitation Program ◽  
Gross Motor ◽  
Gaze Stabilization ◽  
Motor Delay ◽  
Rehabilitation Programs ◽  
Motor Practice ◽  
Balance Exercises

Purpose The purpose of this article was to provide a perspective on vestibular rehabilitation for children. Conclusion The developing child with vestibular dysfunction may present with a progressive gross motor delay, sensory disorganization for postural control, gaze instability, and poor perception of motion and verticality. It is important that vestibular-related impairments be identified early in infancy or childhood so that evidence-based interventions can be initiated. A focused and custom vestibular rehabilitation program can improve vestibular-related impairments, enabling participation. Depending on the child's age, diagnosis, severity, and quality of impairments, vestibular rehabilitation programs may consist of gaze stabilization exercises, static and dynamic balance exercises, gross motor practice, and/or habituation exercises. Exercises must be modified for children, done daily at home, and incorporated into the daily life situation.

New Electro-Dynamic Balance

1882 ◽  
Vol 14 (355supp) ◽  
pp. 5665-5665
Author(s):  
M. Debrun
Keyword(s):  
Dynamic Balance

The Dynamic Balance of Machines

1916 ◽  
Vol 82 (2129supp) ◽  
pp. 262-263
Author(s):  
Chas. L. Clarke
Keyword(s):  
Dynamic Balance

In a spin [wind turbine industry]

2003 ◽  
Vol 17 (4) ◽  
pp. 16
Author(s):  
S. Peace
Keyword(s):  
Wind Turbine

Selection of a leading edge noise prediction method for PNoise

2018 ◽  
pp. 214-223
Author(s):  
AM Faria ◽  
MM Pimenta ◽  
JY Saab Jr. ◽  
S Rodriguez
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Prediction Method ◽  
Leading Edge ◽  
Wind Farms ◽  
Broadband Noise ◽  
Turbulence Energy ◽  
Noise Prediction ◽  
Migration Routes ◽  
Turbulent Inflow

Wind energy expansion is worldwide followed by various limitations, i.e. land availability, the NIMBY (not in my backyard) attitude, interference on birds migration routes and so on. This undeniable expansion is pushing wind farms near populated areas throughout the years, where noise regulation is more stringent. That demands solutions for the wind turbine (WT) industry, in order to produce quieter WT units. Focusing in the subject of airfoil noise prediction, it can help the assessment and design of quieter wind turbine blades. Considering the airfoil noise as a composition of many sound sources, and in light of the fact that the main noise production mechanisms are the airfoil self-noise and the turbulent inflow (TI) noise, this work is concentrated on the latter. TI noise is classified as an interaction noise, produced by the turbulent inflow, incident on the airfoil leading edge (LE). Theoretical and semi-empirical methods for the TI noise prediction are already available, based on Amiet’s broadband noise theory. Analysis of many TI noise prediction methods is provided by this work in the literature review, as well as the turbulence energy spectrum modeling. This is then followed by comparison of the most reliable TI noise methodologies, qualitatively and quantitatively, with the error estimation, compared to the Ffowcs Williams-Hawkings solution for computational aeroacoustics. Basis for integration of airfoil inflow noise prediction into a wind turbine noise prediction code is the final goal of this work.

WIND TURBINE MATHEMATICAL MODEL

2020 ◽  
Vol 21 (11) ◽  
Author(s):  
Denis Zakiev ◽  
Andrey Margin ◽  
Nikolay Krutskikh ◽  
Sergey Alibekov
Keyword(s):  
Mathematical Model ◽  
Wind Turbine

Physical exercise protects dynamic balance and motor coordination of rats treated with vincristine

2020 ◽  
Vol 19 (5) ◽  
pp. 336
Author(s):  
Luiza Minato Sagrillo ◽  
Viviane Nogueira De Zorzi ◽  
Luiz Fernando Freire Royes ◽  
Michele Rechia Fighera ◽  
Beatriz Da Silva Rosa Bonadiman ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Locomotor Activity ◽  
Physical Exercise ◽  
Motor Coordination ◽  
Dynamic Balance ◽  
Exercise Group ◽  
Adult Rats ◽  
The Central Nervous System ◽  
Stress Damage ◽  
Training Protocol

Physical exercise has been shown to be an important modulator of the antioxidant system and neuroprotective in several diseases and treatments that affect the central nervous system. In this sense, the present study aimed to evaluate the effect of physical exercise in dynamic balance, motor coordination, exploratory locomotor activity and in the oxidative and immunological balance of rats treated with vincristine (VCR). For that, 40 adult rats were divided into two groups: exercise group (6 weeks of swimming, 1h/day, 5 days/week, with overload of 5% of body weight) and sedentary group. After training, rats were treated with 0.5 mg/kg of vincristine sulfate for two weeks or with the same dose of 0.9% NaCl. The behavioral tests were conducted 1 and 7 days after each dose of VCR. On day 15 we carried out the biochemical analyzes of the cerebellum. The physical exercise was able to protect against the loss of dynamic balance and motor coordination and, had effect per se in the exploratory locomotor activity, and neutralize oxidative stress, damage DNA and immune damage caused by VCR up to 15 days after the end of the training protocol. In conclusion, we observed that previous physical training protects of the damage motor induced by vincristine.Key-words: exercise, oxidative stress, neuroprotection, cerebellum.

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