Experiment Investigation and Numerical Simulation of Snowdrift on a Typical Large‐Span Retractable Roof

Cao, Zhenggang; Liu, Mengmeng; Wu, Pengcheng

doi:10.1155/2019/5984804

Cited by 14 publications

(3 citation statements)

References 26 publications

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“…e static analysis is mainly used to analyze the deformation and equivalent stress of the chassis after being loaded. According to the value of the total variables and the equivalent stress on the cloud map, the bearing capacity of each part of the chassis is analyzed [32]. Based on the previous meshing, loading and restraining of the chassis frame, the stress-strain cloud map is obtained as Figure 5.…”

Section: Stress and Strain Analysis Of The Chassis Framementioning

confidence: 99%

Structure Design and Bearing Capacity Analysis for Crawler Chassis of Rice Combine Harvester

Tang

Ren

et al. 2020

Complexity

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Due to the current unstable travel performance and poor driving maneuverability of rice combine harvester crawler chassis with high load in the rice field, the driver’s standard sitting posture model was developed by analyzing the handling of the crawler chassis driving control panel. Based on this model, the joystick length and cab manipulation space layout were designed. The Finite Element Software was used to develop the loading and restraining model of the chassis frame, and then the structural characteristics and bearing capacity of the crawler chassis were analyzed. The high-bearing running stability and the rationality of operating force of the joystick of rice combine harvester crawler chassis designed in this paper through experiments were verified by experiments. The results showed that when the crawler chassis of rice combine harvester bears a load of 3.5 t, the driving speed is relatively stable in the three speed ranges of 1 m/s, 1.5 m/s, and 2 m/s, and the maximum variance of driving speed variation is 5.022 × 10−4. The actual average operating force of each operating lever on the crawler chassis ranges from 30.36 to 42.71 N, and the operating force of each operating lever is suitable for 95% of Chinese adult male operators. The research results provide a good method and reference for the future development of the crawler chassis structure of rice combine harvester.

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Section: Stress and Strain Analysis Of The Chassis Framementioning

confidence: 99%

Structure Design and Bearing Capacity Analysis for Crawler Chassis of Rice Combine Harvester

Tang

Ren

et al. 2020

Complexity

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“…However, it is challenging to conduct precise quantitative research for the railway lines passing through areas prone to wind and snow disasters or sparsely populated Gobi areas, mainly due to the large accidental errors and low reproducibility of measurement and the presence of many uncontrollable external factors (Tominaga, 2018). Researchers have widely recognized wind tunnel tests due to the advantages of controllable environmental variables and systematic parametric measurement (Cao et al, 2019;Kumar et al, 2020). Wind tunnel tests allow scaling building entities by adopting granular materials with different properties and performing calculations according to the similarity criterion (Zhou et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of snow cover distribution along railway subgrade and the protective effect of snow fences

Lei,

Cheng,

Gao

et al. 2023

J. Arid Land

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Railways built in cold, snowy, and lightly populated areas are subjected to wind and snow disasters. In this study, we selected a snow hazard prevention and control section of the Altay-Zhundong Railway in Xinjiang Uygur Autonomous Region of China as the research object. We investigated the deposited snowfall variation characteristics on the two sides and in the embankment pavement area of snow fences with different porosities, fence heights, and arrangement distances using single-factor tests and orthogonal tests based on global atmospheric reanalysis climate data, field survey data, and a multi-phase flow analysis model. The results showed significant differences in the characteristics of snow cover distribution and snow cover thickness between the embankment and the cutting in the absence of snow protection measures. The maximum snow cover thickness of the embankment pavement decreased by 12.6% relative to the cutting pavement. The snow cover thickness of the embankment exhibited an increasing trend from windward shoulder to leeward shoulder, whereas the snow cover thickness of the cutting presented a declining trend from windward shoulder to leeward toe. In the collaborative prevention and control of snow fences and embankments, the three factors can be ranked in terms of their sensitivity to deposited snowfall within the influence scope of snow fences as follows: fence height>arrangement distance>porosity. At the same time, fence height yielded a significant relationship for the influence scope of snow fences (P<0.05). The three factors can also be ranked in terms of their sensitivity to deposited snowfall on the pavement as follows: porosity>fence height>arrangement distance. For the embankment protection of the Altay-Zhundong Railway against wind and snow, snow fence with a porosity of 75%, a fence height of 4.8 m, and an arrangement distance from the embankment of 60 m produced the best snow control effect. By revealing the characteristics of snow cover distribution along railway subgrade and the protective effect of snow fences, this study provides valuable references for the engineering applications of railway construction in areas prone to wind and snow disasters.

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“…Cao et al carried out an experiment and numerical study on snowdrift on a typical large-span retractable roof utilizing the Euler-Euler technique. It was revealed that not one unchanging snow delivery on the roofs was different, which must be well thoughtout [23]. Other researchers also researched the various turbines for power generation, axial flow pumps, and energy conservation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Computational Flow Characterization Analyses of Centrifugal Pump Operating as Turbine

Chang

Adu

et al. 2021

Complexity

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Using a pump in reverse mode as a hydraulic turbine remains an alternative for hydropower generation in meeting energy needs, especially for the provision of electricity to remote and rural settlements. The primary challenge with small hydroelectric systems is attributed to the high price of smaller size hydraulic turbines. A specific commercial pump model, with a flow rate of 12.5 m3/h, head 32 m, pressure side diameter of 50 mm, impeller out, and inlet diameters of 160 mm and 6 mm, respectively, was chosen for this research. This research aimed to investigate a pump’s flow characteristics as a turbine to help select a suitable pump to be used as a turbine for micro- or small hydropower construction. Numerical methodologies have been adopted to contribute to the thoughtful knowledge of pressure and velocity distribution in the pump turbine performance. In this study, the unsteady flow relations amongst the rotating impeller and stationary volute of the centrifugal pump made up four blades and four splitters. Intermittent simulation results of pressure and velocity flow characteristics were studied considering diverse impeller suction angles. The study was conducted by considering a wide range of rotational speeds starting from 750 rpm to 3250 rpm. From the results, it was found that PAT operation was improved when operated at low speeds compared to high-speed operation. Thus, speeds between 1500 rpm and 2000 rpm were suitable for PAT performance. This research helps to realize the unsteady flow physiognomies, which provide information for future research on PAT. This study makes useful facts available which could be helpful for the pump turbine development. Future studies should focus on cost analysis and emission generation in energy generation.

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Experiment Investigation and Numerical Simulation of Snowdrift on a Typical Large‐Span Retractable Roof

Cited by 14 publications

References 26 publications

Structure Design and Bearing Capacity Analysis for Crawler Chassis of Rice Combine Harvester

Structure Design and Bearing Capacity Analysis for Crawler Chassis of Rice Combine Harvester

Characteristics of snow cover distribution along railway subgrade and the protective effect of snow fences

Numerical Simulation and Computational Flow Characterization Analyses of Centrifugal Pump Operating as Turbine

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