Quality evaluation and its application to surface water ecosystem based on maximum flux principle

Liu, Nianlei; Mao, Guozhu; Zhao, Lin

doi:10.1007/s12209-010-1419-x

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…The CMA solves the low efficiency of traditional methods through the use of chaotic search methods [24,25]. The algorithm is a global optimization algorithm and is intelligent; in particular, it can be applicable for the optimization of multi-variable and multi-value functions.…”

Section: The Chaotic Monkey Algorithmmentioning

confidence: 99%

A new sparse design method on phased array-based acoustic emission sensor for partial discharge detection

Xie¹,

Cheng²,

Lü³

et al. 2014

Meas. Sci. Technol.

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The acoustic detecting performance of a partial discharge (PD) ultrasonic sensor array can be improved by increasing the number of array elements. However, it will increase the complexity and cost of the PD detection system. Therefore, a sparse sensor with an optimization design can be chosen to ensure good acoustic performance. In this paper, first, a quantitative method is proposed for evaluating the acoustic performance of a square PD ultrasonic array sensor. Second, a method of sparse design is presented to combine the evaluation method with the chaotic monkey algorithm. Third, an optimal sparse structure of a 3 × 3 square PD ultrasonic array sensor is deduced. It is found that, under different sparseness and sparse structure, the main beam width of the directivity function shows a small variation, while the sidelobe amplitude shows a bigger variation. For a specific sparseness, the acoustic performance under the optimal sparse structure is close to that using a full array. Finally, some simulations based on the above method show that, for certain sparseness, the sensor with the optimal sparse structure exhibits superior positioning accuracy compared to that with a stochastic one. The sensor array structure may be chosen according to the actual requirements for an actual engineering application.

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Section: The Chaotic Monkey Algorithmmentioning

confidence: 99%

A new sparse design method on phased array-based acoustic emission sensor for partial discharge detection

Xie¹,

Cheng²,

Lü³

et al. 2014

Meas. Sci. Technol.

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“…The fluid dynamics model is established based on the volume average continuity equation and average momentum conservation equation [18] .The porosity distribution function of random packed bed in model is calculated by the following relational [19]…”

Section: Mathematical Modelmentioning

confidence: 99%

“…F LS in the average momentum conservation equation [18] is the resistance of random packing filler to liquid, F LG is the interaction force between the two phases when the gas-liquid two-phase flow.…”

Section: 555( )mentioning

confidence: 99%

CFD Simulation of Flow in Random Packing Columns with Seawater Desulfurization

Gao¹,

Wang²,

Wang³

et al. 2011

AMR

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Based on the volume average method, gas-liquid two-phase flow CFD model is established to describe the random packing column in seawater desulfurization. The fluid velocity and porosity distribution were obtained by calculation. Based on the experimental research with three different filler, the dry and wet loss curves which describes gas flow with in each packed bed are obtained, calculations results of pressure loss and experimental results are well consistent. Analyzing the seawater velocity vector in packed columns and velocity profile of the section on the middle of the packed tower, a significant “wall flow” phenomena was found. There is an accumulation trend near the wall along the direction of the liquid flow, and the wall flow becomes much more serious. As can be seen from the chart that the porosity distribution on the radial direction near the wall is significantly higher than it is at the middle area, which is the reason for the formation of wall flow.

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“…Terefore, the reuse of waste rubber materials is important for the protection of resources and the environment [1][2][3]. At present, the domestic construction industry advocates energy saving, environmental protection, and green development, and research has shown that mixing a certain amount of rubber particles into concrete can efectively improve its mechanical performance [4]. Hu et al [5] found that as the amount of rubber admixture increased, the compressive, tensile, and shear strengths of the specimens subsequently decreased and the ductility increased.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Dynamic Mechanical Performance of Rubber Concrete under Freeze-Thaw Cycle Damage

Zhang

2023

Shock and Vibration

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In order to study the effect of the freeze-thaw cycle on the integrity and dynamic mechanical performance of rubber concrete, the wave speed of rubber concrete specimens with 10% rubber volume was measured by a nonmetallic ultrasonic detector. The impact tests were also performed on rubber concrete specimens with different numbers of freeze-thaw cycles (0, 25, 50, 75, 100, and 125) at different impact air pressures (0.3, 0.4, 0.5, and 0.6 MPa) using a 74 mm diameter split Hopkinson pressure bar (SHPB) device, peak stress, ultimate strain dynamic intensity enhancement factor (DIF), and energy absorption effect. The results show that with the increase of freeze-thaw cycles, the wave speed decreases, and the freeze-thaw action will damage the rubber concrete and reduce the longitudinal wave velocity. Under the same freeze-thaw cycles, with the rise of strain rate, the peak stress, limit strain, DIF, and absorbed energy increase, and there is an obvious strain rate effect; under the pressure of 0.6 MPa, the peak stress of 25, 50, 75, 100, and 125 freeze-thaw cycles decreases by 25.1%, 37.1%, 46%, 52.5%, and 54.8%. With the increase of the freeze-thaw cycles, the peak stress of the specimen decreases, and the decrease gradually decreases. After the number of cycles exceeds 100, the stress decrease of the specimen is no longer obvious, the limit strain increases, and the absorbed energy decreases. The freeze-thaw environment significantly reduces the strength and integrity of rubber concrete specimens.

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Quality evaluation and its application to surface water ecosystem based on maximum flux principle

Cited by 4 publications

References 16 publications

A new sparse design method on phased array-based acoustic emission sensor for partial discharge detection

A new sparse design method on phased array-based acoustic emission sensor for partial discharge detection

CFD Simulation of Flow in Random Packing Columns with Seawater Desulfurization

Investigations of Dynamic Mechanical Performance of Rubber Concrete under Freeze-Thaw Cycle Damage

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