Development of Airborne Ultrasonic Velocimeter and Its Application to Helicopters

Matayoshi, Naoki; Inokuchi, Hamaki; Yazawa, Kenji; Okuno, Y.

doi:10.2514/6.2005-6118

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…In addition to conventional surface observations, intensive observations from ground-based NICT and Electronic Navigation Research Institute (ENRI) Doppler lidars (Komatsubara and Kaku 2005) and Japan Aerospace Exploration Agency (JAXA) helicopter flights (Matayoshi et al 2005) were obtained. In addition to conventional surface observations, intensive observations from ground-based NICT and Electronic Navigation Research Institute (ENRI) Doppler lidars (Komatsubara and Kaku 2005) and Japan Aerospace Exploration Agency (JAXA) helicopter flights (Matayoshi et al 2005) were obtained.…”

Section: E Intensive Observations During the Study Periodmentioning

confidence: 99%

Toward Improved Forecasts of Sea-Breeze Horizontal Convective Rolls at Super High Resolutions. Part I: Configuration and Verification of a Down-Scaling Simulation System (DS3)

Chen

Zhu

Sha

et al. 2015

Monthly Weather Review

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Horizontal convective rolls (HCRs) that develop in sea breezes greatly influence local weather in coastal areas. In this study, the authors present a realistic simulation of sea-breeze HCRs over an urban-scale area at a resolution of a few meters. An advanced Down-Scaling Simulation System (DS 3 ) is built to derive the analyzed data using a nonhydrostatic model and data assimilation scheme that drive a building-resolving computational fluid dynamics (CFD) model. The mesoscale-analyzed data well capture the inland penetration of the sea breeze in northeastern Japan. The CFD model reproduces the HCRs over Sendai Airport in terms of their coastal initiation, inland growth, streamwise orientation, specific locations, roll wavelength, secondary flows, and regional differences due to complex surfaces. The simulated HCRs agree fairly well with those observed by dual-Doppler lidar and heliborne sensors. Both the simulation and observation analyses suggest that roll updrafts typically originate in the narrow bands of low-speed streaks and warm air near the ground. The HCRs are primarily driven and sustained by a combination of wind shear and buoyancy forces within the slightly unstable sea-breeze layer. In contrast, the experiment without data assimilation exhibits a higher deficiency in the reproduction of roll characteristics. The findings highlight that CFD modeling, given reliable mesoscale weather and surface conditions, aids in high-precision forecasting of HCRs at unprecedented high resolutions, which may help determine the roll structure, dynamics, and impacts on local weather.

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Section: E Intensive Observations During the Study Periodmentioning

confidence: 99%

Toward Improved Forecasts of Sea-Breeze Horizontal Convective Rolls at Super High Resolutions. Part I: Configuration and Verification of a Down-Scaling Simulation System (DS3)

Chen

Zhu

Sha

et al. 2015

Monthly Weather Review

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“…Heliborne in situ measurements were performed with a research helicopter (MuPAL‐ ɛ ) of JAXA [ Okuno et al , 2002; Matayoshi et al , 2005]. The JAXA helicopter was equipped with a 3D ultrasonic velocimeter/thermometer at the tip of the nose boom, pressure transducers connected to pitot‐tubes and static pressure holes located at both sides of the forward fuselage, and a hybrid differential Global Positioning System/inertial navigation system.…”

Section: Observation and Data Analysismentioning

confidence: 99%

Dual‐Doppler lidar observation of horizontal convective rolls and near‐surface streaks

Iwai

Ishii

Tsunematsu

et al. 2008

Geophysical Research Letters

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“…Sensors such as twelve hole probes, thermal anemometers, and sonic anemometers can measure airspeed in all directions (nearly all directions in the case of the twelve hole probe). [5] [6] For the application of a cheap and small UAV, these devices are too heavy and costly creating a need for a low cost and light weight solution. A 3D printed version of a five hole probe has been made, but it is only able to measure wind velocity up to 25 degrees from the longitudinal axis.…”

Section: Introductionmentioning

confidence: 99%

Wind Tunnel Tests of a Pitot-Static Tube Array to Estimate Wind Velocity

Simmons¹,

Montalvo²,

Kimball³

2019

Preprint

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This paper examines the use of a pitot-static tube array (PSA) to estimate horizontal wind velocity in all directions. This method uses the readings from the PSA as inputs. No flight tests have been done, but this method could potentially be used to estimate wind velocity from small UAVs. To do this, UAV ground speed and attitude must be available as inputs. Wind tunnel data of the PSA was used to create an algorithm that estimates wind velocity even when the wind is not parallel with any of the pitot-static tubes. This paper discuses the wind tunnel data, the algorithm, and the application for small UAVs.

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Development of Airborne Ultrasonic Velocimeter and Its Application to Helicopters

Cited by 6 publications

References 1 publication

Toward Improved Forecasts of Sea-Breeze Horizontal Convective Rolls at Super High Resolutions. Part I: Configuration and Verification of a Down-Scaling Simulation System (DS3)

Toward Improved Forecasts of Sea-Breeze Horizontal Convective Rolls at Super High Resolutions. Part I: Configuration and Verification of a Down-Scaling Simulation System (DS3)

Dual‐Doppler lidar observation of horizontal convective rolls and near‐surface streaks

Wind Tunnel Tests of a Pitot-Static Tube Array to Estimate Wind Velocity

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