Relevant bibliographies by topics / Gust analysis

Academic literature on the topic 'Gust analysis'

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Published: 14 March 2023

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Journal articles on the topic "Gust analysis"

1

Knoop, Helge, Felix Ament, and Björn Maronga. "A generic gust definition and detection method based on wavelet-analysis." Advances in Science and Research 16 (July 29, 2019): 143–48. http://dx.doi.org/10.5194/asr-16-143-2019.

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Abstract. Wind gusts can have destructive effects on many structures and objects deemed valuable to humans. The aviation industry, for example, views gusts as a major hazard. Their destructive effect is proportional to the momentum that a specific gust imposes onto an object. The actual definition of a gust has a strong influence on how its impact can be quantified. Existing gust definitions, however, are largely based on fixed parameters describing shape requirements and thresholds and are often developed only for specific use cases. These gust definitions do not provide a direct link to the physical impact a particular gust has on a structure or object. The overall goal of this study is to provide such a direct link. The application of a wavelet-analysis to a turbulence-resolving wind velocity signal allows for the localization of signal amplitudes in the period as well as in the time domain. In this paper, we use wavelet-analysis in order to develop a straight-forward method of deriving information about gusts from a wind velocity signal. In order to define what a particular gust might be, we suggest the specification of a characteristic period and amplitude in the time-domain. We define a generic gust as a section of a wind velocity signal, where the wavelet-analysis detects that characteristic amplitude to be matched or exceeded within that characteristic period. The characteristic amplitudes and periods are generic and span a two-dimensional space of generic gust definitions. The method can be applied to turbulence resolving simulation data as well as high-resolution wind velocity measurement data. It can detect gusts of any shape, it is unbiased regarding any specific use case and invariant to changes of the mean wind. We provide a detailed description of the method, its capabilities and demonstrate its application to high resolution wind velocity measurement data.
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Berger, Frederik, Lars Neuhaus, David Onnen, Michael Hölling, Gerard Schepers, and Martin Kühn. "Experimental analysis of the dynamic inflow effect due to coherent gusts." Wind Energy Science 7, no. 5 (September 8, 2022): 1827–46. http://dx.doi.org/10.5194/wes-7-1827-2022.

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Abstract. The dynamic inflow effect describes the unsteady aerodynamic response to fast changes in rotor loading due to the inertia of the wake. Fast changes in turbine loading due to pitch actuation or rotor speed transients lead to load overshoots. The phenomenon is suspected to be also relevant for gust situations; however, this was never shown, and thus the actual load response is also unknown. The paper's objectives are to prove and explain the dynamic inflow effect due to gusts, and compare and subsequently improve a typical dynamic inflow engineering model to the measurements. An active grid is used to impress a 1.8 m diameter model turbine with rotor uniform gusts of the wind tunnel flow. The influence attributed to the dynamic inflow effect is isolated from the comparison of two experimental cases. Firstly, dynamic measurements of loads and radially resolved axial velocities in the rotor plane during a gust situation are performed. Secondly, corresponding quantities are linearly interpolated for the gust wind speed from lookup tables with steady operational points. Furthermore, simulations with a typical blade element momentum code and a higher-fidelity free-vortex wake model are performed. Both the experiment and higher-fidelity model show a dynamic inflow effect due to gusts in the loads and axial velocities. An amplification of induced velocities causes reduced load amplitudes. Consequently, fatigue loading would be lower. This amplification originates from wake inertia. It is influenced by the coherent gust pushed through the rotor like a turbulent box. The wake is superimposed on that coherent gust box, and thus the inertia of the wake and consequently also the flow in the rotor plane is affected. Contemporary dynamic inflow models inherently assume a constant wind velocity. They filter the induced velocity and thus cannot predict the observed amplification of the induced velocity. The commonly used Øye engineering model predicts increased gust load amplitudes and thus higher fatigue loads. With an extra filter term on the quasi-steady wind velocity, the qualitative behaviour observed experimentally and numerically can be caught. In conclusion, these new experimental findings on dynamic inflow due to gusts and improvements to the Øye model enable improvements in wind turbine design by less conservative fatigue loads.
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Yan, Bowen, Pakwai Chan, Qiusheng Li, Yuncheng He, Ying Cai, Zhenru Shu, and Yao Chen. "Characterization of Wind Gusts: A Study Based on Meteorological Tower Observations." Applied Sciences 12, no. 4 (February 17, 2022): 2105. http://dx.doi.org/10.3390/app12042105.

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Accurate information on wind gusts is of critical importance to various practical problems. In this study, observational wind data from high-frequency response (i.e., at a sampling rate of 10 Hz), ultrasonic anemometers instrumented at four different heights (i.e., 10 m, 40 m, 160 m, 320 m) on a weather tower were collected. The observation site featured a typical suburban condition, with no significant obstacles in the immediate proximity. The data were analyzed to identify a total of twelve descriptors of wind gusts, and to find the parent distributions that estimate these parameters well via regression analysis. The results show that the gust parameters in the context of gust magnitude and amplitude with units are best fit by the Weibull model, while non-dimensional parameters in terms of gust factor and peak factor are reasonably assessed by the log-logistic distribution. The uplift time and gust nonsymmetric factor generally exhibit a lognormal distribution, while the Gamma distribution can describe the gust length scale, uplift magnitude and passage time. It is also shown that gust factors increase linearly along with turbulence intensity. Nevertheless, empirical linear formulas given in previous studies tend to over-predict. For the vertical structure of gust descriptors, it is found that the average wind speed, gust amplitude and gust length scale in 10 min monotonically increase with height, whereas the function relationship of gust amplitude, peak factor, gust factor, turbulence intensity, rise amplitude and falling amplitude tends to decrease with height.
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Martín, M. L., F. Valero, A. Pascual, A. Morata, and M. Y. Luna. "Springtime connections between the large-scale sea-level pressure field and gust wind speed over Iberia and the Balearics." Natural Hazards and Earth System Sciences 11, no. 1 (January 21, 2011): 191–203. http://dx.doi.org/10.5194/nhess-11-191-2011.

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Abstract. This paper investigates, by means of Singular Value Decomposition analysis, the springtime relationships between the mean sea-level pressure field over the North Atlantic and the regional wind gusts over the Iberian Peninsula, identifying the main atmospheric circulation patterns linked to gust wind speed anomaly configurations. The statistical significance of the obtained modes is investigated by means of Monte Carlo approach. The analysis highlighted that the covariability is dominated by two main large-scale features of the atmospheric circulation over the North Atlantic. The first mode relates to Iberian gust wind speeds to the Scandinavian pattern (SCAND), linking the large-scale pattern to above-normal wind gusts. The second covariability mode, associated with the North Atlantic Oscillation (NAO) pattern, correlates with maximum wind speeds over Iberia. An enhanced spring NAO pattern is related to positive (negative) wind gust correlations over northern (southern) Iberia. To find true relationships between large-scale atmospheric field and the gust wind speeds, composite maps were built up to give an average atmospheric circulation associated with coherent wind gust variability over Iberia.
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Naaim-Bouvet, Florence, Mohamed Naaim, Hervé Bellot, and Kouichi Nishimura. "Wind and drifting-snow gust factor in an Alpine context." Annals of Glaciology 52, no. 58 (2011): 223–30. http://dx.doi.org/10.3189/172756411797252112.

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AbstarctWind-transported snow is a common phenomenon in cold windy areas, creating snowdrifts and contributing significantly to the loading of avalanche release areas. It is therefore necessary to take into account snowdrift formation both in terms of predicting and controlling drift patterns. Particularly in an Alpine context, drifting snow is a nonstationary phenomenon, which has not been taken into account in physical modeling carried out in wind tunnels or in numerical simulations. Only a few studies have been conducted to address the relation between wind gusts and drifting-snow gusts. Consequently, the present study was conducted at the Lac Blanc pass (2700ma.s.l.) experimental site in the French Alps using a snow particle counter and a cup anemometer in order to investigate drifting-snow gusts. First, it was shown that the behavior of the wind gust factor was coherent with previous studies. Then the definition of wind gust factor was extended to a drifting-snow gust factor. Sporadic drifting-snow events were removed from the analysis to avoid artificially high drifting-snow gust factors. Two trends were identified: (1) A high 1 s peak and a mean 10 min drifting-snow gust factor, greater than expected, were observed for events that exhibited a gamma distribution on the particle width histogram. The values of drifting-snow gust factors decreased with increasing gust duration. (2) Small drifting-snow gusts (i.e. smaller than or of the same order of magnitude as wind gusts) were also observed. However, in this case, they were systematically characterized by a snow particle size distribution that differed from the two-parameter gamma probability density function.
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Wang, Linpeng, Yuting Dai, and Chao Yang. "Gust Response Analysis for Helicopter Rotors in the Hover and Forward Flights." Shock and Vibration 2017 (2017): 1–20. http://dx.doi.org/10.1155/2017/8986217.

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Dynamic load due to gust for helicopter rotors directly affects the structural stress and flight performance. In case of gust, it may cause the loss of trust force or the increase of deflection for rotors. In current work, an effective coupled aeroelastic model based on a medium-deflection beam theory and a nonlinear unsteady aerodynamic model in the time domain were constructed. Three types of gust in vertical direction were added in the model. The dynamic response and structural load for helicopter rotors under three types of gust were calculated, respectively. Results indicated that when rotors suffer a gust in hover at downward direction, the thrust force on rotor disk would decrease significantly when the gust amplitude increases, which should be paid attention in the design. Among the three gust types with the same gust strength, the maximum instantaneous shear force due to impulse shape gust is the largest. When the rotors suffer a gust in a forward flight, the shear force at the root of rotors would increase with the gust strength first but then it decreases. More attention should be paid to the decrease of thrust force and the increase of structural load in a forward flight.
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Dai, Yuting, Linpeng Wang, Chao Yang, and Xintan Zhang. "Dynamic Gust Load Analysis for Rotors." Shock and Vibration 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5727028.

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Dynamic load of helicopter rotors due to gust directly affects the structural stress and flight performance for helicopters. Based on a large deflection beam theory, an aeroelastic model for isolated helicopter rotors in the time domain is constructed. The dynamic response and structural load for a rotor under the impulse gust and slope-shape gust are calculated, respectively. First, a nonlinear Euler beam model with 36 degrees-of-freedoms per element is applied to depict the structural dynamics for an isolated rotor. The generalized dynamic wake model and Leishman-Beddoes dynamic stall model are applied to calculate the nonlinear unsteady aerodynamic forces on rotors. Then, we transformed the differential aeroelastic governing equation to an algebraic one. Hence, the widely used Newton-Raphson iteration algorithm is employed to simulate the dynamic gust load. An isolated helicopter rotor with four blades is studied to validate the structural model and the aeroelastic model. The modal frequencies based on the Euler beam model agree well with published ones by CAMRAD. The flap deflection due to impulse gust with the speed of 2m/s increases twice to the one without gust. In this numerical example, results indicate that the bending moment at the blade root is alleviated due to elastic effect.
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Szwed, Piotr, Paweł Rzucidło, and Tomasz Rogalski. "Estimation of Atmospheric Gusts Using Integrated On-Board Systems of a Jet Transport Airplane—Flight Simulations." Applied Sciences 12, no. 13 (June 22, 2022): 6349. http://dx.doi.org/10.3390/app12136349.

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Currently, quite accurate measurements of atmospheric gusts are carried out by airport systems only in the vicinity of the runways. There is a still open issue of availability of information about real wind gusts at cruising altitudes and during approach at a considerable distance from the airfield. Standard on-board systems of a jet transport airplane provide some information which is desirable to have knowledge of how flight parameters reflect real gust parameters and their impact on the aircraft dynamics. The paper proposes an algorithm for headwind gust magnitude estimation in relation to aircraft response. The analysed estimation algorithms assume the use of data available from the existing on-board systems only without the employment of any extra sensors or ground and satellite systems. In this way, many problems caused by different structures, configurations, and ways of installation of additional sensors and structural changes are rejected. The algorithms use the classical method for estimation of wind parameters as well as a linear longitudinal model of aircraft dynamics, taking into account the influence of wind gusts. Data fusion was realised with the use of three filtration methods. Results were evaluated to select the most accurate method of the estimation. Test data were obtained from advanced flight simulation. The experimental scenario considered a flight of a passenger twin-engine jet airplane through a layer of programmed gusts. The results of the flight simulations allowed us to determine the accuracy of the proposed gust estimation algorithms in reference to the ideal wind-speed data analysis obtained directly from the simulation environment (with the accuracy of the simulation process). The use of the proposed gust estimation algorithms may provide more accurate signal for integrated on-board systems, especially for wind shear detection and sped-up response time of flight control systems, protecting aircrafts against the adverse impact of encountered wind shear or gusts, e.g., auto-thrust or auto-throttle systems. The dedicated algorithm presented in the paper may increase the safety level of take-off and approach phases in gusty conditions and also during significant changes in wind speed at cruising altitudes in the case of crossing the area of jet stream occurrence.
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Yao, Gang, Mingpu Wang, and Yang Yang. "The safety analysis of transportation vehicles carrying prefabricated units under the action of gusts." MATEC Web of Conferences 259 (2019): 03001. http://dx.doi.org/10.1051/matecconf/201925903001.

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The prefabricated-unit industry has developed rapidly and the safety of vehicles carrying prefabricated units has received extensive attention. In order to evaluate the safety of vehicles carrying prefabricated units under the action of gusts, the roughness of road surfaces was simulated by the sinusoid superposition method. Furthermore, the wind load was simulated by the harmonic synthesis method. The analysis model of the 13-DOF vehicle was established, and the wind-vehicle-road system was formed. In addition, the safety of the vehicles carrying prefabricated units under gusts was analyzed. It is demonstrated that when a vehicle encounters a sudden gust during driving, lateral deviation of the body will occur. The contact force on the windward side wheel will drop sharply and the wheel is easy to get off the ground, which decides whether a rollover accident happens or not. It sheds light on the safety analysis for ultra-wide and overweight vehicles under gust action.
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Jing, Zhiwei, and Chu Tang. "Dynamic Response Analysis of the Aircraft Exposed to the Lateral Travelling Gust." Journal of Physics: Conference Series 2364, no. 1 (November 1, 2022): 012024. http://dx.doi.org/10.1088/1742-6596/2364/1/012024.

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Abstract The travelling gust from detonation is an interesting and severe excitation for a flying aircraft, and it is characterized by high emanating speed and takes strong energy. Previous investigations on the dynamic response characteristics of the aircraft in the tail-on or head-on travelling gust have been carried out. This paper focuses on the lateral travelling gust and its influence on the dynamic response of the aircraft. Based on conventional flight dynamics equations, the dynamics modelling and simulation technique of the rigid aircraft exposed to the lateral travelling gust is established. By employing the static pressure distributions, one quasi-steady aerodynamics computation method is presented to determine the aerodynamic force and moment on the aircraft in the travelling gust. Simulation results show that the approach presented in this paper is effective and can deal with the engineering requirement. Results also indicate that the enveloping process of the travelling gust increases the aerodynamic moment of the x-axis significantly and subsequently influences the dynamic responses along the x-axis.
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Dissertations / Theses on the topic "Gust analysis"

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Orimoto, Mika. "Regional analysis of extreme gust wind speed." Thesis, University of Hawaii at Manoa, 2003. http://hdl.handle.net/10125/7043.

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There are two objectives of this study. The first objective is to determine the domain of attraction of an extreme value distribution of gust wind speeds, at a selected station, when only limited samples from the site are available. The second objective is to perform a series of homogeneity tests for the selected stations, such that homogenous regions for these extreme gust winds may be identified. After carefully examining the wind data available, it was decided that 133 out of more than 750 stations in the contiguous United States were selected for the study. These selected stations all have confirmed Exposure C environments, with at least 15 years of records. All wind speeds used in this study were adjusted to 10 meters above ground level. On the basis of a S-statistic method, the proper representations of extreme gust winds at the 133 selected weather stations in the contiguous United States are examined. The results indicate that the annual extreme gust wind speeds at 65 out of the 133 stations are Gumbel extreme value distributions (Type I), whereas the other 68 stations' extreme gust wind speeds are reverse Weibull (Type III), distributed. Nine homogeneous regions, for the annual extreme gust winds, were identified by applying a Type I based regional analysis. This analysis was applied to the 65 stations in the contiguous United States whose annual extreme gust winds are Type I distributed.
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Bekemeyer, P. "Rapid computational aerodynamics for aircraft gust response analysis." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3027827/.

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Computational engineering methods play a more and more important role in building aircraft that move people and goods. Particular in high-speed civil air transport increased usage of higher fidelity simulation tools are expected to enable greener designs with a reduced environmental footprint. The challenge of including computational fluid dynamics in aircraft loads and aeroelasticity is addressed herein. During the aircraft design and certification process a tremendous number of dynamic responses to atmospheric turbulence need to be analysed. Current industrial loads computations are based on corrected linear potential flow methods which offer fast predictions but suffer several drawbacks once aerodynamic non-linearities occur. Instead, aerodynamic loads offered by computational fluid dynamics are highly accurate also at these non-linear conditions. However, computational cost necessary for performing time-marching simulations makes these methods prohibitive for unsteady loads in an industrial context. This work addresses how to efficiently introduce computational fluid dynamics based aerodynamics during gust loads analysis. It is shown that using frequency domain methods in conjunction with reduced order modelling techniques based on modal decomposition and projection offer accurate models which can be analysed at low cost. The three requirements of such an industrial gust loads process are, first, the need for high accuracy, secondly, a significant reduction of runtime compared to unsteady full order time-marching simulations, and thirdly, the ability to automatise the generation and solution process of the reduced model as well as the design and certification process. Therefore, the linearised frequency domain method is extended towards gust responses by altering the right-hand side forcing term. An aerodynamic reduced order model is constructed by computing a modal basis using proper orthogonal decomposition and projecting the linearised equations afterwards. Finally, a coupled aeroelastic model is obtained by combining the aerodynamics model with eigenmodes of the coupled Jacobian matrix for the structural vibration and projecting the coupled linearised equations. The final small sized aeroelastic model enables the inclusion of highly accurate loads during time-critical gust loads analysis and provides the opportunity to introduce these loads in a wider multidisciplinary context. Thus it is a substantial step towards establishing computational fluid dynamics for unsteady aeroelastic analysis.
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Knoblach, Andreas [Verfasser]. "Robust Performance Analysis for Gust Loads Computation / Andreas Knoblach." München : Verlag Dr. Hut, 2015. http://d-nb.info/1076437699/34.

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Miftach, Fetri Emirudin Hartawan. "The application of multivariable control methods to gust load alleviation analysis." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311343.

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Lanier, Prather Jonathan. "Stereovision Correction Using Modal Analysis." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/31662.

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Presently, aerial photography remains a popular method for surveillance of landscapes, and its uses continually grow as it is used to monitor trends in areas such as plant distribution and urban construction. The use of computer vision, or more specifically stereo vision, is one common method of gathering this information. By mounting a stereo vision system on the wings of an unmanned aircraft it becomes very useful tool. This technique however, becomes less accurate as stereo vision baselines become longer, aircraft wing spans are increased, and aircraft wings become increasingly flexible. Typically, ideal stereo vision systems involve stationary cameras with parallel fields of view. For an operational aircraft with a stereo vision system installed, stationary cameras can not be expected because the aircraft will experience random atmospheric turbulence in the form of gusts that will excite the dominate frequencies of the aircraft. A method of stereo image rectification has been developed for cases where cameras that will be allowed to deflect on the wings of an fixed wing aircraft that is subjected to random excitation. The process begins by developing a dynamic model the estimates the behavior of a flexible stereo vision system and corrects images collected at maximum deflection. Testing of this method was performed on a flexible stereo vision system subjected to resonance excitation where a reduction in stereo vision distance error is shown. Successful demonstration of this ability is then repeated on a flying wing aircraft by the using a modal survey to understand its behavior. Finally, the flying wing aircraft is subjected to random excitation and a least square fit of the random excitation signal is used to determine points of maximum deflection suitable for stereo image rectification. Using the same techniques for image rectification in resonance excitation, significant reductions in stereo distance errors are shown.
Master of Science
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Jingeleski, David John. "Aerodynamic Analysis of Variable Geometry Raked Wingtips for Mid-Range Transonic Transport Aircraft." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/49562.

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Previous applications have shown that a wingtip treatment on a commercial airliner will reduce drag and increase fuel efficiency and the most common types of treatment are blended winglets and raked wingtips. With Boeing currently investigating novel designs for its next generation of airliners, a variable geometry raked wingtip novel control effector (VGRWT/NCE) was studied to determine the aerodynamic performance benefits over an untreated wingtip. The Boeing SUGAR design employing a truss-braced wing was selected as the baseline. Vortex lattice method (VLM) and computational fluid dynamics (CFD) software was implemented to analyze the aerodynamic performance of such a configuration applied to a next-generation, transonic, mid-range transport aircraft. Several models were created to simulate various sweep positions for the VGRWT/NCE tip, as well as a baseline model with an untreated wingtip. The majority of investigation was conducted using the VLM software, with CFD used largely as a validation of the VLM analysis. The VGRWT/NCE tip was shown to increase the lift of the wing while also decreasing the drag. As expected, the unswept VGRWT/NCE tip increases the amount of lift available over the untreated wingtip, which will be very beneficial for take-off and landing. Similarly, the swept VGRWT/NCE tip reduced the drag of the wing during cruise compared to the unmodified tip, which will favorably impact the fuel efficiency of the aircraft. Also, the swept VGRWT/NCE tip showed an increase in moment compared to the unmodified wingtip, implying an increase in stability, as well providing an avenue for roll control and gust alleviation for flexible wings. CFD analysis validated VLM as a useful low fidelity tool that yielded quite accurate results. The main results of this study are tabulated "deltas" in the forces and moments on the VGRWT/NCE tip as a function of sweep angle and aileron deflection compared to the baseline wing. A side study of the effects of the joint between the main wing and the movable tip showed that the drag impact can be kept small by careful design.
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Welstead, Jason Crouse Gilbert L. "Stability analysis of a segmented free-wing concept for UAS gust alleviation in adverse environments." Auburn, Ala, 2009. http://hdl.handle.net/10415/1847.

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Gust, Norbert [Verfasser], Elfgard [Akademischer Betreuer] Kühnicke, and Norbert [Akademischer Betreuer] Meyendorf. "Improvement of signal analysis for the ultrasonic microscopy / Norbert Gust. Gutachter: Elfgard Kühnicke ; Norbert Meyendorf. Betreuer: Elfgard Kühnicke." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1067189602/34.

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RONCALLO, LUCA. "Evolutionary spectral model for thunderstorm outflows and application to the analysis of the dynamic response of structures." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1080956.

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Thunderstorms are destructive phenomena at the mesoscale with extension of few kilometres and short duration, potentially dangerous for mid-low structures. The nonstationary nature of the wind field generated by thunderstorm outflows makes most of the theory and models developed for extra-tropical cyclones unsuitable and their small extension make them difficult to be detected by one single anemometer. These circumstances prevent the collection of precious data over which research can be carried out and the development of robust models for rapid engineering calculations shared by the scientific community. Therefore, a unified and reliable analytical model for the assessment of the maximum dynamic response to thunderstorms coherent with the techniques commonly adopted in wind engineering is not yet available. In this framework, the thesis introduces an Evolutionary Power Spectral Density (EPSD) model of the wind velocity related of thunderstorm outflows, consistent with full-scale records, and studies its application to calculate the alongwind dynamic response of structures and its maximum from an operative perspective. The EPSD model is derived starting from the analysis of 129 full-scale thunderstorm records, assuming the turbulent fluctuations uniformly modulated and the turbulence intensity constant. The reliability of the assumptions are verified on the basis of the data available. Three analytical models for the modulating function of the slowly-varying mean wind velocity are proposed. The models are based on the functions extracted from the records and include parameters of physical meaning for the thunderstorm outflow. Moreover, the possibility of adopting the classical spectral models of synoptic winds to model the stationary part of the turbulence is verified. Successively, the EPSD model is adopted to calculate the dynamic response of a set of linear elastic point-like SDOF systems with variable fundamental frequency and damping ratio, both accounting and neglecting the effects of the transient dynamics. In this framework a closed-form solution of the Evolutionary Frequency Response Function (EFRF) is derived. The mean value of the maximum response is estimated based on an Equivalent Parameter Technique (EPT) from literature, generalizing the Davenport’s gust factor technique. The effects of the Poisson hypothesis are investigated and mitigated introducing an equivalent expected frequency. The results are validated with the ones obtained in the time domain starting from the real thunderstorm records available. Successively, a sensitivity analysis is carried out to assess the influence on the maximum dynamic response of the parameters that shape the modulating function of the velocity. A closed-form solution for the equivalent parameters and the gust factor is introduced. The comparison with alternative formulations proposed in the literature demonstrates the improved accuracy of the proposed one. Finally, the formulation is extended to the analysis of slender vertical structures, adopting a vertical profile for the mean wind velocity from the literature and the equivalent wind spectrum technique. Two case studies of vertical slender structures are analysed and a comparison with synoptic wind loading conditions is outlined, showing that the proposed model constitutes a valid and handy tool for the evaluation of the wind loading on structures provided by thunderstorm outflows.
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Wojciak, Johannes D. [Verfasser]. "Quantitative Analysis of Vehicle Aerodynamics during Crosswind Gusts / Johannes Wojciak." München : Verlag Dr. Hut, 2012. http://d-nb.info/1028784619/34.

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Books on the topic "Gust analysis"

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Jonge, J. B. de. Re-analysis of European flight load data. Amsterdam: National Aerospace Laboratory, 1993.

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Etkin, Bernard. Comment on "NASA investigation of a claimed 'overlap' between two gust response analysis methods". [S.l.]: [s.n.], 1992.

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R, Gorla Rama S., and NASA Glenn Research Center, eds. Gust response analysis of a turbine cascade. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Noback, R. Statistical properties of atmospheric turbulence relevant to the calculation of airplane loads. Amsterdam: National Aerospace Laboratory, 1988.

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C, Hall Kenneth, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Development of a linearized unsteady aerodynamic analysis for cascade gust response predictions. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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S, Pototzky Anthony, Woods Jessica A, and Langley Research Center, eds. An investigation of the "overlap" between the Statistical Discrete Gust and the Power Spectral Density analysis methods. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1989.

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S, Pototzky Anthony, and Langley Research Center, eds. On the relationship between matched filter theory as applied to gust loads and phased design loads analysis. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1989.

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Walter, Frost, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. Analysis of aerodynamic coefficients using gust gradient data: Spanwise turbulence effects on airplane response. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Zahlungsbereitschaft für kollektive Umweltgüter: Soziologische und ökonomische Analysen. Wiesbaden: VS Verlag für Sozialwissenschaften, 2007.

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Flesch, Thomas K. Extreme value analysis of wind gusts in Alberta. [Ottawa, Ont: Forestry Canada, 1993.

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Book chapters on the topic "Gust analysis"

1

Erguvan, Inan Deniz. "SWOT Analysis of GUST Writing Lab." In Writing Centers in the Higher Education Landscape of the Arabian Gulf, 213–28. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55366-5_12.

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Hübner, Andreas, and Lars Reimer. "Multidisciplinary Simulation for Gust Load Alleviation Control Surface Analysis." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 576–85. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25253-3_55.

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Ning, Xiaozhou, Yunju Yan, Kangkang Qu, and Zhilao Li. "Reliability Analysis on Wing Structures under the Gust Load." In Artificial Intelligence and Computational Intelligence, 31–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16527-6_5.

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Maiti, D. K., and Anil Kumar Ammina. "Structural Reliability Analysis of Composite Wing Subjected to Gust Loads." In Proceedings of the International Symposium on Engineering under Uncertainty: Safety Assessment and Management (ISEUSAM - 2012), 355–70. India: Springer India, 2012. http://dx.doi.org/10.1007/978-81-322-0757-3_20.

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Meskouris, Konstantin, Christoph Butenweg, Klaus-G. Hinzen, and Rüdiger Höffer. "Stochasticity of Wind Processes and Spectral Analysis of Structural Gust Response." In Structural Dynamics with Applications in Earthquake and Wind Engineering, 153–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57550-5_3.

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Pieracci, Andrea. "Application of a Probabilistic Approach of Durability Analysis to Gust Loaded Structures and Some Possible Extensions." In Reliability Assessment of Cyclically Loaded Engineering Structures, 443–66. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5556-4_16.

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Umbach, Carla, and Helmar Gust. "Grading Similarity." In Language, Cognition, and Mind, 365–86. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-50200-3_17.

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AbstractThere are numerous words across languages expressing similarity or indistinguishability. In this paper, three types of similarity expressions in German and English are compared—ähnlich/similar, so/such, and gleich/same. They differ in a number of respects, one of them being gradability: While ähnlich/similar are gradable, so/such as well as gleich/same are not. The analysis in this paper starts from the analysis of German so as a demonstrative expressing similarity (instead of identity) to its demonstration target (Umbach and Gust 2014). It is suggested that the meaning of the three types of similarity expressions is based on a common similarity relation, while differences in meaning are provided by constraints referring to the selection of dimensions of comparison and preconditions of usage. The focus of the paper is on gradability and on the question of what it means for a pair of items to be more similar than another pair. An analysis in the spirit of Klein (1980) is presented accounting for the fact that ähnlich/similar are gradable while neither so/such nor gleich/same are. The formal framework makes use of representations based on attribute spaces and classifiers, where representations may be of different granularity.
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Aggarwal, Sanchita, Ajay Jaiswal, and Anu Gupta Aggarwal. "Understanding Guest Experience Using Online Reviews." In Asset Analytics, 381–89. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3643-4_30.

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Camarinha-Silva, Amélia, and W. Florian Fricke. "Molecular Microbiome Analysis." In The Gut Microbiome in Health and Disease, 49–65. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90545-7_4.

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Dovrolis, Nikolas. "In Silico Metagenomics Analysis." In Gut Microbiome-Related Diseases and Therapies, 29–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-59642-2_2.

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Conference papers on the topic "Gust analysis"

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Kim, M., S. Lee, and A. Kabe. "Atmospheric flight gust loads analysis." In 40th Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-1252.

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Manwaring, S. R., and D. C. Wisler. "Unsteady Aerodynamics and Gust Response in Compressors and Turbines." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-422.

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A comprehensive series of experiments and analyses were performed on compressor and turbine blading to evaluate the ability of current, practical, engineering/analysis models to predict unsteady aerodynamic loading of modern gas turbine blading. This is part of an on-going effort to improve methods for preventing blading failure. The experiments were conducted in low-speed research facilities capable of simulating the relevant aerodynamic features of turbomachinery. Unsteady loading on compressor and turbine blading was generated by upstream wakes and, additionally for compressors, by a rotating inlet distortion. Fast-response hot-wire anemometry and pressure transducers embedded in the airfoil surfaces were used to determine the aerodynamic gusts and resulting unsteady pressure responses acting on the airfoils. This is the first time that gust response measurements for turbines have been reported in the literature. Several different analyses were used to predict the gust response of the blading: (1) a classical flat-plate analysis, (2) a 2-D linearized flow analysis with a “frozen gust” model, (3) a 2-D linearized flow analysis with a “distorted gust” model, (4) a 2-D linearized Euler analysis, and (5) a 2-D non-linear Euler analysis. Also for the first time, a detailed comparison of these analyses methods is made and the importance of properly accounting for both vortical and potential disturbances is demonstrated. The predictions are compared with experiment and their abilities assessed to help guide designers in using these prediction schemes.
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Tischler, V., and V. Venkayya. "Structural optimization for gust load alleviation." In 7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and Optimization. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-4778.

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Fidkowski, Krzysztof, Ilan Kroo, Karen Willcox, and Frode Engelson. "Stochastic Gust Analysis Techniques for Aircraft Conceptual Design." In 12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-5848.

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Prasad, Dilip, and Joseph M. Verdon. "Validation of a Three-Dimensional Linearized Euler Analysis for Classical Wake/Stator Interactions." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30400.

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A comprehensive validation of the linearized Euler analysis, LINFLUX, for wake/blade row interaction is carried out. The flow configuration is that of the benchmark problem for rotor-stator interaction proposed at the Third Computational Aeroacoustics Workshop. It consists of an unstaggered, annular, flat-plate blade row excited by the vortical gusts associated with the wakes shed from an upstream rotor. The LINFLUX numerical results for the unsteady pressure responses of the stator are compared with semi-analytic lifting surface and lifting line solutions. The validation is first conducted for narrow-annulus flows, where the numerical results are shown to agree well with classical two-dimensional solutions over a range of frequencies. We then carry out a detailed comparison of the three-dimensional LINFLUX results with the lifting surface results of Namba and Schulten for a blade row with a hub to tip ratio of 0.5. This study encompasses gust excitation frequencies for which the stator responses vary from cut off to propagating, as well as gusts with varying degrees of spanwise variation. The numerical and semi-analytical analyses yield results for the stator pressure response, including the complex amplitudes of the propagating and least attenuated, evanescent, pressure modes that are in very good agreement. The effect of increasing the spanwise phase variation of the gust is generally, but not necessarily, to reduce the power associated with the acoustic response of the blade row.
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Vio, Gareth, and Jonathan Cooper. "Optimisation of Composite Sensorcraft Structures for Gust Alleviation." In 12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-6017.

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Clark, J., M. Kim, and A. Kabe. "Statistical analysis of atmospheric flight gust loads analysis data." In 40th Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-1253.

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Cooper, Jonathan, Simon Miller, Otto Sensburg, and Gareth Vio. "Optimization of a Scaled Sensorcraft Model with Passive Gust Alleviation." In 12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-5875.

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Leira, Bernt J., Dag Myrhaug, and Jarle Voll. "Dynamic Response Analysis of a Spar Platform Subjected to Wind and Wave Forces." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57227.

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Results from a study on dynamic response analysis of a floating production unit (FPSO) excited by wave and wind forces are presented. The FPSO is examplified by a Spar platform considering the motion in surge and pitch. The wind gust is modelled with the Harris [4] and Ochi and Shin [7] wind gust spectra. The effect of the wave age on the wind gust spectrum is included by adopting the Volkov wave age dependent sea surface roughness parameter [10]; the wave age independent Charnock roughness parameter [2] is also used as a reference. Examples of results demonstrate clear effects of wave age on the dynamic response. Moreover, for high mean wind speeds the total wind response is much smaller than the wave response, but for low mean wind speeds the wind appears to be more important.
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Blower, Christopher J., and Adam M. Wickenheiser. "The Variations in Active Panel Location and Number for a Bioinspired Aircraft Gust Alleviation System." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7994.

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This paper presents the development of a biomimetic closed-loop flight controller that integrates gust alleviation and flight control into a single distributed system of feather-like panels over the upper and lower surfaces. This bio-inspired gust alleviation system (GAS) mimics the techniques used by birds to respond to turbulent and gusting airflow. The GAS design replicates the profile of a bird’s wing through the installation of feather-like panels across the upper and lower surfaces of the airfoil, and replacement of the trailing-edge flaps. While flying through gusts, the flight controller uses a linear quadratic regulator to perform continuous adjustments to the local states through active deflection of electromechanical feathers. This system consequently offers a wide range of flap configurations that enable the vehicle to perform gust response maneuvers unachievable by standard aircraft. The GAS is developed using a 2D adaptive panel method that enables analysis of the airfoil’s aerodynamic performance during all flap configurations. The airfoil’s dynamic model is simulated to calculate the disturbances incurred during gusting flows. The flight controller tracks the vehicles velocity, angle of attack and position, and continuously performs adjustment to the orientation of each flap to induce the corrective responses to inbound gusts. The replacement of standard single trailing edge profile with the integration of a dual trailing edge (DTE) configuration offers a reduction of the aircraft’s deviation from the target flight path through the introduction of aero-braking during strong longitudinal gusts. The introduction of 6 additional surface flaps offers new flap configurations capable of minimizing the disturbances in the aircraft’s global states. Non-linear and linear dynamic models of the 8-flap GAS are compared to a traditional single control surface baseline wing and the DTE configuration. The feedback loops synthesized depend on the inertial changes of the global states; however, variations in flap configuration are compared. The integration of an 8-flap GAS provides enhancements to maneuverability and stability in turbulent intensive environments.
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Reports on the topic "Gust analysis"

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Kim, M. C., A. M. Kabe, and S. S. Lee. Atmospheric Flight Gust Loads Analysis. Fort Belvoir, VA: Defense Technical Information Center, July 1999. http://dx.doi.org/10.21236/ada381098.

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Clark, J. B., M. C. Kim, and A. M. Kabe. Statistical Analysis of Atmospheric Flight Gust Loads Analysis Data. Fort Belvoir, VA: Defense Technical Information Center, July 1999. http://dx.doi.org/10.21236/ada381315.

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Sako, B. H., M. C. Kim, A. M. Kabe, and W. K. Yeung. Derivation of Forcing Functions for Monte Carlo Atmospheric Gust Loads Analysis. Fort Belvoir, VA: Defense Technical Information Center, July 1999. http://dx.doi.org/10.21236/ada381177.

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Jurkevitch, Edouard, Carol Lauzon, Boaz Yuval, and Susan MacCombs. role of nitrogen-fixing bacteria in survival and reproductive success of Ceratitis capitata, the Mediterranean fruit fly. United States Department of Agriculture, September 2005. http://dx.doi.org/10.32747/2005.7695863.bard.

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Objectives: to demonstrate nitrogen fixation in the gut of Ceratitiscapitata, the Mediterranean fruit fly and that fixed nitrogen is important for the fly. Background: Fruit flies (Diptera: Tephritidae) are a highly successful, widespread group of insects causing enormous economic damage in agriculture. They are anautogenous, i.e. the acquisition of nitrogenous compounds by both male and female is essential for the realization of their reproductive potential. Nitrogen, although abundant in the atmosphere, is paradoxically a limiting resource for multicellular organisms. In the Animalia, biological nitrogen fixation has solely been demonstrated in termites. Major achievements and conclusions: We found that all individuals of field-collected medflies harbor large diazotrophicenterobacterial populations that express dinitrogenreductase in the gut. Moreover, nitrogen fixation was demonstrated in isolated guts and in live flies and may significantly contribute to the fly’s nitrogen intake. Specific components of these communities were shown to be transmitted vertically between flies. Moreover, we found that the gut bacterial community changes during the fly’s active season both in composition and complexity. Moreover, strong changes in community structure were also observed between the fly's various developmental stages. An initial analysis using SuPERPCR, a technology enabling the detection of minor populations by selective elimination of the dominant 16S rDNA sequences revealed that Pseudomonasspp. may also be part of the gut community. Implications: The presence of similar bacterial consortia in additional insect orders suggests that nitrogen fixation occurs in vast pools of terrestrial insects. On such a large scale, this phenomenon may have a considerable impact on the nitrogen cycle.
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Gong, Boshen, Fanrui Meng, and Yang Yang. Association Between Gut Microbiota and Autoimmune Thyroid Disease: A Systematic Review and Meta-Analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, April 2021. http://dx.doi.org/10.37766/inplasy2021.4.0135.

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Huang, Li, Xin Luo, and Ming Chen. Effect of Traditional Chinese Medicine on Gut Microbiota with Chronic Kidney Disease: A Systematic Review and Meta-Analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, October 2021. http://dx.doi.org/10.37766/inplasy2021.10.0118.

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Rioux, Nathalie. Twenty-Fifth Annual Report on Federal Agency Use of Voluntary Consensus Standards and Conformity Assessment. Gaithersburg, MD: National Institute of Standards and Technology, 2022. http://dx.doi.org/10.6028/nist.ir.8438.

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In FY 2021, the 22 federal agencies that reported did not add or rescind any GUS in lieu of VCS, therefore there remains a total of 80 previously reported GUS in lieu of VCS still in use. This analysis does not reflect the use of standards by the Department of Defense (DoD) or the National Aeronautics and Space Administration (NASA) as they report their use of GUS on a categorical basis via a different reporting mechanism. Agencies demonstrate the effectiveness of the NTTAA and Circular A-119 by their continuous review of opportunities to rescind GUS in favor of using VCS, and their involvement with the private sector through the VCS process. These activities suggest that federal agencies are cognizant of the benefits of meeting their mission needs by actively seeking to use VCS developed by the private sector. In accordance with its coordination role as defined in the NTTAA and OMB A-119, NIST continues to assist federal agencies and their stakeholders with standards and conformity assessment information, program support, guidance, and policy concerns. NIST hosts http://standards.gov, which offers ongoing practical guidance and information needed by agencies to implement the NTTAA successfully and report standards activities as required by the NTTAA and OMB Circular A-119. This report fulfills the annual reporting requirements of both the NTTAA and OMB Circular A-119.
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Liu, Xiaopei, Dan Liu, and Cong’e Tan. Gut microbiome-based machine learning for diagnostic prediction of liver fibrosis and cirrhosis: a systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, May 2022. http://dx.doi.org/10.37766/inplasy2022.5.0133.

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Review question / Objective: The invasive liver biopsy is the gold standard for the diagnosis of liver cirrhosis. Other non-invasive diagnostic approaches, have been used as alternatives to liver biopsy, however, these methods cannot identify the pathological grade of the lesion. Recently, studies have shown that gut microbiome-based machine learning can be used as a non-invasive diagnostic approach for liver cirrhosis or fibrosis, while it lacks evidence-based support. Therefore, we performed this systematic review and meta-analysis to evaluate its predictive diagnostic value in liver cirrhosis or fibrosis. Condition being studied: Liver fibrosis and cirrhosis. Liver fibrosis refers to excessive deposition of liver fibrous tissue caused by various pathogenic factors, such as hepatitis virus, alcohol, and drug-induced chemical injury. Continuous progression of liver fibrosis can lead to liver cirrhosis.
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Huang, Langlang, Jianan Wang, Ri Xu, Yanwei Liu, and Zhongyong Liu. Regulatory effect of traditional Chinese medicine on gut microbiota in patients with atherosclerosis：A protocol for systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, November 2020. http://dx.doi.org/10.37766/inplasy2020.11.0056.

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Tang, Li-li, Yue-dong Liu, Hong-wu Tao, Wen-zhe Feng, Yu-ping Shu, and Fan-yan Meng. The efficacy and safety of ulcerative colitis treatment based on the theory of the " lung–gut axis ": a meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2023. http://dx.doi.org/10.37766/inplasy2023.3.0014.

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Review question / Objective: The purpose of this study was to investigate the difference between the curative effect of traditional Chinese medicine or integrated traditional Chinese and Western medicine on ulcerative colitis under the guidance of lung-intestine axis theory and that of Western medicine alone. The selected research method was to search relevant randomized controlled trial in Chinese and English medical databases. The Cochrane bias risk assessment tool was used to analyze the quality of RCT studies, and RevMan 5.3 was used for efficacy evaluation and meta-analysis. Condition being studied: Ulcerative colitis (UC) is a nonspecific intestinal inflammatory disease that often involves the rectum and colon submucosa. It is characterized by abdominal pain, diarrhea and purulent bloody stool. There is no specific therapy for ulcerative colitis at present. This study investigates the curative effect of traditional Chinese medicine or integrated traditional Chinese and Western medicine therapy on UC under the guidance of lung-intestine axis theory and provides a theoretical basis for the clinical treatment of UC.
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