Wind-induced vibration response analysis of Chinese solar greenhouses

Wang, Cong; Jiang, Yingchun; Li, Xiaoye; Bai, Yanchao; Wang, Tieliang

doi:10.1016/j.compag.2020.105954

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…In addition, a PVC mini greenhouse can be easily folded [12][13]. On the other hand, the impact of wind load on the mini greenhouse should not reduce its stability [14][15]. So, the stiffeners are added.…”

Section: Problem Formulationmentioning

confidence: 99%

A new greenhouse: an attempt to reduce the cost of growing plants

2021

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Growing plants in extremely cold environmental conditions is a difficult and expensive process. The required microclimate is usually created for plants artificially on the protected ground. For this purpose, we have developed an industrial prototype of a mini greenhouse, which allows to grow single plants. Laboratory tests have confirmed that the mini greenhouse provides optimal internal environment conditions due to the design features. This leads to a significant reduction in the cost of plants growing.

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Section: Problem Formulationmentioning

confidence: 99%

A new greenhouse: an attempt to reduce the cost of growing plants

2021

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“…In our previous work, a block method was proposed for the dynamic response analysis of a solar greenhouse with a plane rigid frame model under wind load 13 . The wind-induced vibration responses of a 12 m span truss solar greenhouse were also investigated by the time domain method 14 . These two results showed that both the stress and displacement under instantaneous wind loads are larger than those under the corresponding average wind loads.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response analysis of a whole steel frame solar greenhouse under wind loads

Wang

Jiang

et al. 2022

Sci Rep

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In recent years, whole steel frame steel greenhouses have become increasingly prevalent. With the characteristics of large flexibility and small mass, whole steel frame steel greenhouses are sensitive to wind loads. However, studies on the safety of whole steel frame steel greenhouses under wind loads are still limited. In this study, a 10 m span whole steel frame solar greenhouse was taken as the research objective. Taking the Davenport spectrum as the target spectrum, the time history of the wind speed was simulated by the harmonic superposition method. The finite element model of the greenhouse structure was established using ANSYS software. The simulated wind pressure was applied on the greenhouse structure for dynamic response analysis. The dynamic response results were compared with the static analysis results under average wind load. The results showed that the greenhouse structure mainly bears bending stress under wind load. The bending stress, axial stress and displacement of the greenhouse skeleton under average wind loads are lower than those under instantaneous wind loads. It is necessary to consider the dynamic characteristics of wind loads in the design of solar greenhouses. A wind-induced vibration coefficient is obtained, which can be used to convert the dynamic load into the equivalent static load and improve its design efficiency.

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“…The pillar cuttage depth determines the wind resistance of the arch shed. The analyses of wind resistance for greenhouses have mostly focused on the environment of the greenhouse [11][12][13]. A small arch shed covered with a flexible plastic film is strongly sensitive to wind load.…”

Section: Introductionmentioning

confidence: 99%

Design of and Experiments with an Automatic Cuttage Device for an Arch Shed Pillar with Force Feedback

et al. 2022

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In order to realize the automatic cutting of arch shed pillars, an automatic cuttage device for an arch shed pillar with force feedback was designed in this study. First, the wind resistance of the arch shed was simulated and analyzed using ANSYS, and the cuttage depth of the arch shed pillar was determined. According to the environment for the cuttage operation of the arch shed pillar and the agronomic requirements, such as the arch shed span, arch shed height, and cuttage depth, the function, structure, and basic design parameters of the arch shed automatic cuttage device were determined. Then, to reduce the damage rate of the pillar and achieve equal-depth cuttage, a force feedback system for the actuator of the cuttage device was constructed to estimate the cuttage resistance and depth in real time. To reduce the impact of the starting and stopping of each motor in the actuator, trajectory planning of the execution end in the pillar transfer stage was performed in the Cartesian coordinate system. The motion law of portal trajectory based on the Láme curve was analyzed, and MATLAB simulations were used to solve the relevant motion parameters. In addition, the modality of key components of the cuttage device was simulated and analyzed by using the SOLIDWORKS simulation plug-in. Finally, the experimental prototype was constructed according to the simulation results. The simulation and field cuttage experiments showed that the cuttage device produced equal-depth cuttage for the arch shed pillar, where the depth of the arch shed pillar was 10 cm, the average cuttage time of a single pillar was 6.2 s, and the error of the cuttage depth was ±0.5 cm in wet soil. The operation of the device was stable, as evidenced by the smooth and mutation-free operation trajectory and speed curve of the execution end. The results of the modal experiment suggest that resonance would not occur during the operation for resonance frequencies between 303 Hz and 565 Hz. This arch shed pillar automatic cuttage device has an optimal operation performance and meets the agronomic requirements of arch shed pillar cuttage.

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Wind-induced vibration response analysis of Chinese solar greenhouses

Cited by 11 publications

References 16 publications

A new greenhouse: an attempt to reduce the cost of growing plants

A new greenhouse: an attempt to reduce the cost of growing plants

Dynamic response analysis of a whole steel frame solar greenhouse under wind loads

Design of and Experiments with an Automatic Cuttage Device for an Arch Shed Pillar with Force Feedback

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