Understanding Sample Data

Onajite, Enwenode

doi:10.1016/b978-0-12-420023-4.00008-3

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A sampled signal in the time domain can be accurately reconstructed if the Nyquist criterion is satisfied, and the Nyquist frequency ( F N ) is given as: where F S demonstrates the sampling frequency (Onajite, 2014), (e.g. in our experimental setup the sampling frequency is 15 kHz, consequently the Nyquist frequency is 7.5 kHz.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation of NACA 4415 airfoil using vibration data for stall detection

Ümütlü

Kıral

Karadeniz

2023

AEAT

View full text Add to dashboard Cite

Purpose The purpose of this study is to identify the possible relation between the vibration and the stall by using the vibration response of the airfoil. For this purpose, the root mean square values of the acceleration signals are evaluated to demonstrate the compatibility between the stall angles and the vibration levels. Design/methodology/approach An experimental study is conducted on NACA 4415 airfoil at Reynolds numbers 69e3, 77e3 and 85e3. Experiments are performed from 0° to 25° of the angles of attack (AoA) for each Reynolds number condition. To observe the change of the vibration values at the stall region clearly, experiments are performed with the AoA ranging from 10° to 25° in 1° increments. Three acceleration sensors are used to obtain the vibration data. Findings The results show that the increase in the amplitude of the vibration is directly related to the decrease in lift. These findings indicate that this approach could be beneficial in detecting stall on airfoil-type structures. Originality/value This study proposes a new approach for detecting stall over the airfoil using the vibration data.

show abstract

Section: Methodsmentioning

confidence: 99%

“…where F S demonstrates the sampling frequency (Onajite, 2014), (e.g. in our experimental setup the sampling frequency is 15 kHz, consequently the Nyquist frequency is 7.5 kHz.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of NACA 4415 airfoil using vibration data for stall detection

Ümütlü

Kıral

Karadeniz

2023

AEAT

View full text Add to dashboard Cite

show abstract

Serrated Flow in Alloy Systems

Lebyodkin

Lebedkina

Brechtl

et al. 2021

High-Entropy Materials: Theory, Experiments, and Applications

View full text Add to dashboard Cite

Comparison of calibration characteristics of different acoustic impact systems for measuring bedload transport in mountain streams

et al. 2022

View full text Add to dashboard Cite

Abstract. The Swiss plate geophone (SPG) system has been installed and tested in more than 20 steep gravel-bed streams and rivers, and related studies generally resulted in rather robust calibration relations between signal impulse counts and transported bedload mass. Here, we compare this system with three alternative surrogate measuring systems. A variant of the SPG system uses the same frame (housing) set-up but with an accelerometer instead of a geophone sensor to measure the vibrations of the plate (GP-Acc, for geophone plate accelerometer). The miniplate accelerometer (MPA) system has a smaller dimension of the impact plate and is embedded in more elastomer material than the SPG system. The Japanese pipe microphone (JPM) is a 1 m long version of the system that has been installed in many streams in Japan. To compare the performance of the four systems, we used calibration measurements with direct bedload samples from three field sites and an outdoor flume facility with controlled sediment feed. At our field sites, the systems with an accelerometer and a microphone showed partly large temporal variations in the background noise level, which may have impaired the calibration measurements obtained during certain time periods. Excluding these periods, the SPG, GP-Acc, and JPM all resulted in robust calibration relations, whereas the calibration of the MPA system showed a poorer performance at all sites.

show abstract

Understanding Sample Data

Cited by 3 publications

References 0 publications

Experimental investigation of NACA 4415 airfoil using vibration data for stall detection

Experimental investigation of NACA 4415 airfoil using vibration data for stall detection

Serrated Flow in Alloy Systems

Comparison of calibration characteristics of different acoustic impact systems for measuring bedload transport in mountain streams

Contact Info

Product

Resources

About