Dynamic Response of Flat Roofs Subjected to Non-Stationary Moving Microbursts

Chen, Yong; Guo-guang, Liu; Sun, Bin

doi:10.1080/19942060.2013.11015490

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…First, the multi-point method requires less computation and takes into account more detailed flight characteristics, as it requires solving the six-degree-of-freedom flight nonlinear equations of aircraft motion calculate the size and direction of the microburst in each element. Recent studies have only studied the effects of microbursts on fixed [42] [43] [44] or simple dynamic structures [45] using CFD methods. In addition, in CFD analysis, it is necessary to determine the trajectory of the aircraft in the microburst as a boundary condition.…”

Section: Multi-point Loading Modelmentioning

confidence: 99%

The Effects of Microburst Nonlinear Varying Loads on Aircraft Using a Multi-Point Approach

Pourmoradi,

Sabzehparvar

2024

Preprint

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Microburst is an atmospheric phenomenon that poses a dangerous and unavoidable threat to flying aircraft during takeoff and landing. The dynamic response of the aircraft encountered to the microburst was studied. Research on the interaction between microburst and aircraft motion is needed to assess the effects of aerodynamic forces and momentum. Unlike recent studies using conventional integrated aerodynamic models, the multi-point loading approach allows microburst nonlinear wind loading at any point on the wing and tail combination. In this method, a general reconstruction of aerodynamic forces and moments is calculated by microburst integration with different non-uniformly distributed loads functions on each surface of the aircraft. This algorithm solves the nonlinear equations of motion of a plane with six degrees of freedom and updates the plane's dynamic parameters as input to calculate time- and space-varying microburst effects for each element. The computational complexity of this method is therefore much reduced compared to CFD analysis and at the same time the details of the flight characteristics are taken into account without simplification in the simulation, which takes about 90 seconds of simulation time. We simulate and compare the results of a new and existing micro-race modeling approach. Comparing the two models shows significant differences in flight conditions such as aircraft flight path, angle of attack and angular velocity.

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Section: Multi-point Loading Modelmentioning

confidence: 99%

The Effects of Microburst Nonlinear Varying Loads on Aircraft Using a Multi-Point Approach

Pourmoradi,

Sabzehparvar

2024

Preprint

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“…Therefore, additional studies have been performed particularly to gain a better understanding of the downburst-induced vibration responses of long-span roof structures. Through the use of an improved deterministic-stochastic hybrid model, Chen et al [24] presented a new method to numerically simulate the wind pressure and compute the microburst-induced response of a flat roof. They found that the ratio of the jet speed to translation speed of a microburst significantly influenced the peak value of the structural wind pressure.…”

Section: Introductionmentioning

confidence: 99%

Downburst-Induced Vibration Coefficient of Long-Span Roof Structures

et al. 2022

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Long-span roof structures are vulnerable to being damaged by downbursts due to the sensitivity of such structures to wind loads. However, there is still no simple and practical method for the downburst-resistant design of such structures to date. Inspired by the wind-induced vibration coefficient (WVC) frequently used by engineers, this paper proposes a downburst-induced vibration coefficient (DVC) to evaluate the response of a roof structure subjected to downbursts. The proposed DVC is defined as the ratio of the total response to the mean response of the structure due to the action of downburst wind loads. The influences of different parameters on the downburst-induced vibration response of a long-span single-layer spherical reticulated structure are first analyzed in detail. Then, using a statistical approach, a design DVC, which can be practically adopted for civil engineers to evaluate the total structural response, is proposed to facilitate the structural downburst-resistant design. With the influences of different structural parameters fully taken into consideration, the design DVCs of displacement and internal force are studied through orthogonal analysis. Finally, regression models of the design DVCs are presented, and their reliability is verified via the application to a case study. The verification results indicate that the proposed regression models of the design DVCs are reliable and can be utilized to simply calculate the structural downburst-induced vibration response. The results obtained can serve as a reference for the downburst-resistant design of long-span roof structures.

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Numerical simulations of downburst wind fields: A comparative analysis of stationary and moving storms using the impinging jet model

Fang,

Wang,

Huang

et al. 2024

Physics of Fluids

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Downburst is a hazardous strong wind commonly encountered in thunderstorm weather. Influenced by ambient wind, the downdraft often accompanies horizontal movement while descending. Based on the impinging jet model, this study employs the large eddy simulation method to conduct computational fluid dynamics numerical simulations of stationary and moving downbursts. The evolution process, time-varying wind speed, and wind profile characteristics of the two types of wind fields are compared. This study also discusses the influence of η—which represents the ratio of the storm traveling speed (Vtr) to the jet velocity (Vjet)—on the wind field structure and verifies the applicability of the vector superposition principle in the simulation of the moving downburst. The results show the following: The wind speed and direction time histories obtained from the numerical simulation of moving downbursts have good consistency with the actual wind field records. The movement of the storm causes the near-surface wind field to lose its central symmetry, resulting in a bow-shaped distribution of extreme wind speeds at the storm's leading edge. As η increases, the non-central symmetry of the wind field becomes more pronounced, the maximum horizontal wind speed at the storm's leading edge gradually moves closer to the storm's center, peak wind speeds gradually increase, and the wind speed distribution at the storm's trailing edge shows the opposite trend. The vector superposition principle is not entirely applicable in the simplified analysis of moving downburst, causing significant errors when η is larger than 0.1.

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Dynamic Response of Flat Roofs Subjected to Non-Stationary Moving Microbursts

Cited by 5 publications

References 32 publications

The Effects of Microburst Nonlinear Varying Loads on Aircraft Using a Multi-Point Approach

The Effects of Microburst Nonlinear Varying Loads on Aircraft Using a Multi-Point Approach

Downburst-Induced Vibration Coefficient of Long-Span Roof Structures

Numerical simulations of downburst wind fields: A comparative analysis of stationary and moving storms using the impinging jet model

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