Numerical Simulation of Wind Loads and Wind Induced Dynamic Response of Heliostats

Zang, Chuncheng; Christian, Joshua Mark; Yuan, James K.; Sment, Jeremy; Moya, Adam Chris; Ho, Clifford K.; Wang, Z.F.

doi:10.1016/j.egypro.2014.03.167

Cited by 20 publications

(15 citation statements)

References 3 publications

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“…A mixture simulation (MS) method is proposed to generate the fluctuating wind speed as the boundary conditions in CFD predictions, combining with the weighted amplitude wave superposition (WAWS) method [15] and autoregression (AR) methods [16,17]. The new approach overcomes the defects of the abovementioned traditional methods and inherits their own advantages which guarantee the computing accuracy and efficiency simultaneously.…”

Section: The Methods For Simulating Fluctuating Windmentioning

confidence: 99%

“…Then, the energy distributions of the PSD function of the fluctuating wind are explored by the wavelet method [32] adopting the Hanning windows [33]. Therefore, the main thoughts of the MS method are listed as follows: the parts of the energy concentration are simulated by the WAWS method [15] and the parts of the energy dispersion are generated by the AR method [16]. The final simulating results of the fluctuating wind are obtained by the superposition of the simulating results by the two methods.…”

Section: The Methods For Simulating Fluctuating Windmentioning

confidence: 99%

“…Therefore, the improvement of simulating fluctuating wind speed in the inlet boundary is provided in the present study. Combining with the advantages of weighted amplitude wave superposition (WAWS) [15] and autoregression (AR) [16,17] methods with high accuracy and less time cost, respectively, a mixture simulation (MS) method is proposed and demonstrated as an efficient and accurate simulation method in the present work.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Zhou

Han

et al. 2017

Shock and Vibration

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The offshore structures that play a vital role in oil and gas extraction are always under complicated environmental conditions such as the random wind loads. The structural dynamic response under the harsh wind is still an important issue for the safety and reliable design of offshore structures. This study conducts an investigation to analyze the wind-induced structural response of a typical offshore deck structure. An accurate and efficient mixture simulation method is developed to simulate the fluctuating wind speed, which is then introduced as the boundary condition into numerical wind tunnel tests. Large eddy simulation (LES) is utilized to obtain the time series of wind pressures on the structural surfaces and to determine the worst working condition. Finally, the wind-induced structural responses are calculated by ANSYS Parametric Design Language (APDL). The numerically predicted wind pressures are found to be consistent with the existing experimental data, demonstrating the feasibility of the proposed methods. The wind-induced displacements have the certain periodicity and change steadily. The stresses at the top of the derrick and connections between deck and derrick are relatively larger. These methods as well as the numerical examples are expected to provide references for the wind-resistant design of the offshore structures.

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Section: The Methods For Simulating Fluctuating Windmentioning

confidence: 99%

Section: The Methods For Simulating Fluctuating Windmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Zhou

Han

et al. 2017

Shock and Vibration

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“…Zang et al [13] estimate the dynamic response of a heliostat to wind loads by correlating deformations measured by accelerometers and strain gauges with wind data. Subsequently the frequency response of the deformations is compared with a numerical simulation showing a good match between both methods.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Theoretical Heliostat Wind Loads

et al. 2015

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In the current concentrated solar power (CSP) context central receiver systems seems to be the most promising technology with the highest cost reduction potential. In the construction of such plants the solar field represents one of the largest investments, a fact which has made cost reduction of these elements become the main target for many actors of the solar thermal sector. Therefore, the design of cost efficient heliostats has become a major interest. One of the design challenges is to develop a heliostat which is able to withstand all foreseen mechanical loads, while at the same time have reduce costs by avoiding unnecessary safety margins. To achieve this goal a good knowledge of expected wind loads onto the support structure and drive mechanism is crucial. In this paper a heliostat prototype, equipped with measuring devices, is deployed to a test site in order to measure the true mechanical stresses suffered due to varying wind loads. These data together with the information about wind speed and direction is then used to validate theoretical loads determined via formulations extracted from wind tunnel experiments. It is shown, that for low turbulence conditions the theoretical values correspond well to the measured values; however, for turbulent wind conditions a significant difference is detected. As those conditions are difficult to simulate in wind tunnels or CFD simulations, this shows the importance of on-site testing of new heliostat designs.

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“…Secondly, provided that random wind and waves are a stationary Gaussian process, the combined wind and waves can be described by the power spectral density function (PSDF) [14]. Therefore, many numerical simulation methods are used to simulate the time series of the fluctuating wind and wave loads, such as the two classical approaches, the weighted amplitude wave superposition (WAWS) method [15] and auto-regression (AR) method [16,17]. Integrating the respective advantages of WAWS and AR methods, a mixture simulation (MS) method is applied to the present study with the aid of the wavelet method, whose efficiency and accuracy has been validated in our previous work [13,14].…”

Section: Introductionmentioning

confidence: 99%

Fatigue assessment on local components of a semi-submersible platform subjected to wind and wave loads

Ma¹,

Zhou²,

Bao³

et al. 2018

J. vibroeng.

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The objective in this work is to assess fatigue damages on local components of a semi-submersible platform under combined actions of wind and wave loads in time domain. Some improvements are provided in the present study to improve the efficiency and accuracy of the whole evaluating process. Firstly, a combined wind and wave relationship as well as an innovative mixture simulation method are used to generate time series of random wind and waves. Moreover, an m-block division method is proposed to compress the number of the whole short-term sea states in the wind-wave scatter diagram. Then, with an improved multiple interpolation sub-model method, the structural stress responses of the local structural components are calculated as is in the whole model analysis. Finally, a modified rain-flow counting method is provided and validated to count the stress cycles efficiently and accurately. Thus, the short-and long-term fatigue damages are computed based on the S-N curve approach and the cumulative fatigue damage rule. In relative agreement with the numerical results by the traditional time-domain method and existing experimental data, these proposed improved methods are demonstrated to be applicable and efficient methods for fatigue damage analyses. All the fatigue damages on local components satisfy the specification requirements and the minimum value appears under the up wind-wave state, which is the proper working condition for a semi-submersible platform.

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Numerical Simulation of Wind Loads and Wind Induced Dynamic Response of Heliostats

Cited by 20 publications

References 3 publications

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Experimental Validation of Theoretical Heliostat Wind Loads

Fatigue assessment on local components of a semi-submersible platform subjected to wind and wave loads

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