Correction of various environmental influences on Doppler wind lidar based on multiple linear regression model

Tang, Shengming; Li, Tiantian; Guo, Yun; Zhu, Rong; Qu, Hongya

doi:10.1016/j.renene.2021.12.018

Cited by 13 publications

(5 citation statements)

References 41 publications

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“…Before analyzing the experimental results, abnormal data are removed by checking spikes, dropouts, and absolute limits (Hojstrup, 1993;Vickers and Mahrt, 1997;Tang et al, 2022). Signal-to-noise ratio is also checked for DWL data (Tang et al, 2020;Tang et al, 2022). Both wind tower and DWL data are divided into 10-min datasets for data analysis.…”

Section: Resultsmentioning

confidence: 99%

Investigation of wind characteristics of typhoon boundary layer through field experiments and CFD simulations

Qu²,

Tang³

et al. 2023

Front. Earth Sci.

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High-resolution observations of typhoon boundary layer above 100 m are rare as traditional wind towers are generally below 100 m, which limits the study of typhoon boundary layer and engineering applications such as wind-resistant design of tall buildings and wind turbines in typhoon-prone regions. In this study, boundary layer winds of super typhoon Lekima (2019) are observed, simulated and analyzed. Together with traditional wind tower, Doppler wind lidar is utilized for observations of typhoon boundary layer in order to obtain measured data above 100 m. Besides, Computational Fluid Dynamics (CFD) simulation based on Large Eddy Simulation (LES) method is conducted to further investigate the impact of complex terrain on the near-surface wind characteristics. The results show that the power law fits the mean wind speed profile well below 100 m. However, before and after the typhoon lands, a local reverse or low-level jet occurs in the mean wind speed profile at the height of 100–300 m, which cannot be depicted by the power law. Meanwhile, the turbulence intensity increases with height and experiences larger fluctuations. In addition, there is a significant negative correlation between the ground elevation and power exponents of the fitted mean wind speed profiles. This study provides useful information to better understand wind characteristics of the typhoon boundary layer.

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Section: Resultsmentioning

confidence: 99%

Investigation of wind characteristics of typhoon boundary layer through field experiments and CFD simulations

Qu²,

Tang³

et al. 2023

Front. Earth Sci.

Self Cite

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“…The simplest of these models are one-dimensional linear regression models. However, when portraying the data and establishing the relationship between the variables, we find that the change of the dependent variable is affected by many factors, and for the sake of the comprehensiveness of the information and the accuracy of the model, we need to establish a multiple linear regression model for the data [15].…”

Section: Multiple Linear Regression Modelsmentioning

confidence: 99%

The Embodiment of Aesthetic Education Elements in Vocal Singing Theory and Teaching Practice in the Internet Era

Gong

2024

Applied Mathematics and Nonlinear Sciences

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The teaching of vocal singing in colleges and universities needs to create a teaching environment that is both interesting and knowledgeable for students, and continuously improve their aesthetic ability and comprehensive quality. Based on the ARCS model, this paper designs the structure of the SPOC teaching platform and establishes the teaching mode of vocal singing flipped classroom based on the original folk songs in the cultural tourism industry as the main source of teaching resources. A multiple linear regression model is chosen to analyze the influencing factors of the teaching quality of vocal singing flipped classrooms, and the least squares estimation of the regression model is used to decompose the singular value. For the vocal singing flipped classroom teaching model established in this paper, a multiple linear regression model was established by choosing teaching content, teaching environment, and teaching method as explanatory variables, and the validity was verified in terms of benchmark regression and teaching practice. The results show that teaching content, teaching environment, and teaching method are all significant at a 1% level on the teaching quality of vocal singing flipped classroom, and the fitting value of the three is 0.7856, and the singing emotion expression scores of the students in the group with serious singing problems before and after the teaching experiment have been improved by 6.11 points as a whole. Enhancing students’ aesthetic abilities and emotional expression can be achieved through teaching vocal singing based on aesthetic elements.

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“…Two mirror surfaces are connected with the bottom plate of the seeder, and one mirror surface is connected with the GCR series optical guide rail. At the same time, the mirror is adjustable to keep the optical alignment of the seeder beam [19][20][21][22]. The temperature control and power supply circuit provide temperature control for the temperature-sensitive optical components in the large pulse laser to ensure stable performance.…”

Section: General Architecturementioning

confidence: 99%

Detection of Atmospheric Wind Speed by Lidar Based on Quadrichannel Mach–Zehnder Interferometer

Yang

et al. 2023

Photonics

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For a long time, wind speed profile measurement has been the primary task of weather forecasting. Therefore, the detection of atmospheric wind speed is extremely important for studying the changes in atmospheric motion. In order to solve the problems of insufficient data collection, low resolution, and low accuracy in atmospheric wind field detection, this paper introduces the relevant theories of wind speed detection, completes the optical design of the system according to the research objectives, and determines the selection of optical devices. At the same time, a Doppler wind lidar system based on a quadrichannel Mach–Zehnder interferometer is designed and built to carry out ground-based observation experiments, collect echo signal data, and inverse the atmospheric radial wind speed. Furthermore, the wind measurement error is analyzed. Firstly, the paper introduces the basic principle of the wind measurement system, i.e., using the Doppler effect of light, and then analyzes the frequency discrimination device of the system in detail, and obtains the theoretical calculation method of atmospheric wind speed inversion. At the same time, the relevant datasets of wind measurement system are analyzed, including backscattering ratio, aerosol, and molecular extinction coefficient, and the emission mechanism of the large pulse laser is also studied in detail, which provides a theoretical basis for the model construction of Doppler lidar and the research on the enhancement of pulsed laser emission energy. Secondly, according to the research index of wind measurement, a Doppler wind measurement lidar system based on a quadrichannel Mach–Zehnder interferometer is designed, including the design of ab external light path transceiver system, internal light path interferometer, software and hardware, and algorithm. The calibration of the quadrichannel Mach–Zehnder interferometer is completed, with its maximum interference contrast reaching 0.869. Through the self-developed optical transceiver system and data acquisition system, the echo signal of lidar is received and detected. Lastly, the data of echo signals collected by the interferometer are analyzed, the radial atmospheric wind speed profile is inversed, and the signal-to-noise ratio and wind speed measurement error of the system are evaluated. The experimental results show that the maximum signal-to-noise ratio (SNR) of the system can reach 1433 when the emission pulse energy of the large pulse laser is adjusted to 255 mJ, and the farthest wind speed detection distance is about 8 km. The high-precision wind speed detection range can reach 2 km, the actual wind measurement errors in this range are all within 1.593 m/s, and the minimum error is only 0.418 m/s. In addition, the backscattering coefficient and extinction coefficient of atmospheric molecules and aerosols in the range of 8 km and the atmospheric temperature in the range of 10 km are also measured. The measurement accuracy of the aerosol extinction coefficient is ±0.001 m−1, and the measurement error of atmospheric temperature within 10 km is within 2 K, achieving the expected goals.

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Correction of various environmental influences on Doppler wind lidar based on multiple linear regression model

Cited by 13 publications

References 41 publications

Investigation of wind characteristics of typhoon boundary layer through field experiments and CFD simulations

Investigation of wind characteristics of typhoon boundary layer through field experiments and CFD simulations

The Embodiment of Aesthetic Education Elements in Vocal Singing Theory and Teaching Practice in the Internet Era

Detection of Atmospheric Wind Speed by Lidar Based on Quadrichannel Mach–Zehnder Interferometer

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