Drilling signals analysis for tricone bit condition monitoring

Rafezi, Hamed; Hassani, Ferri

doi:10.1016/j.ijmst.2020.12.025

Cited by 20 publications

(9 citation statements)

References 14 publications

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“…Before running the LS-DYNA 3D program, five elements are designated as observation points to facilitate analyzing and processing the numerical results [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. As shown in Figure 3, points H69786, H68778, H68787, H62503, and H61486 are selected at the lower part of the centerline of two blast holes, which are signed as A, B, C, D, and E, respectively.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

Numerical Simulation on Selection of Optimal Delay Time for Precise Delay Blasting

Wang

et al. 2021

Shock and Vibration

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In the traditional presplitting blasting, the presplit holes are generally uniformly initiated, which causes local damage to the retained rock mass while forming the damping ditch. In order to determine the optimal delay time of the precise delay initiation hole by hole, the finite element software ANSYS/LS-DYNA is used to build a blasting model of the concrete, which includes concrete, explosive, and air to simulate the crack forming process of the presplitting hole under various initiation modes. Four kinds of initiation modes for blasting, namely, simultaneous initiation with 0 ms, 9 ms, 12 ms, and 15 ms of delay between adjacent holes, are set up to determine the exact delay time of the best presplitting effect. The simulation results show that when the prehole detonates simultaneously, the inner hole crack penetrates the fastest, but the peak stress around the hole is up to 147.9 MPa. When interhole delayed initiation is used, although the time of interhole crack penetration is prolonged, the stress coupling is generated around the precrack and the maximum stress is obviously reduced. The maximum stress generated under the three delayed initiation conditions is only 76.8 MPa. Considering the requirement of damage control of surrounding rock mass and the rapid formation of precrack, 9 ms delay time is determined as the precise delay time of this test.

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Section: Simulation Results and Analysismentioning

confidence: 99%

Numerical Simulation on Selection of Optimal Delay Time for Precise Delay Blasting

Wang

et al. 2021

Shock and Vibration

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“…Smaller modulus of the graded Advances in Civil Engineering crushed stone cushion layer has a greater impact on subgrade modulus and cement-stabilized crushed stone modulus, and the influence degree has a certain dependence on the pavement structure characteristics. (3) Although the tested resilient modulus of the structure layer using the bearing plate method is the static elastic modulus, and the inverted modulus using the deflection value tested by FWD is the dynamic value, they show a high correlation [22][23][24]; besides, the inverted modulus of graded crushed stone cushion layer is much greater than the measured value.…”

Section: Influence Of Modulus Of the Graded Gravel Cushion Layer On The Inverted Modulus Of Subgrade And Cement-stabilizedmentioning

confidence: 99%

Modulus Inversion Layer by Layer of Different Asphalt Pavement Structures

Cao¹,

Huang²,

Zou

et al. 2021

Advances in Civil Engineering

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In order to improve the accuracy of modulus inversion of the pavement structure layer, a layer-by-layer inversion method was proposed to be compared with the traditional inversion method by inverting the modulus of each structural layer of the inverted asphalt pavement and semirigid asphalt pavement. The results show that the influence of cushion modulus on the modulus of inverted subgrade and modulus of cement-stabilized crushed stone is restricted by the cushion modulus and pavement structure characteristics, and the thicker cement-stabilized crushed stone layer is beneficial for improving inverted modulus of subgrade; besides, for the inverted asphalt pavement, the modulus of the graded crushed stone transition layer has a significant influence on the modulus inversion of cement-stabilized crushed stone. The modulus of the graded gravel transition layer inverted by these two methods is underestimated, the modulus of cement-stabilized gravel is overestimated using the traditional inversion method, and the inversion result of the inverted asphalt pavement is more significantly affected by the inversion method than the semirigid base asphalt pavement. Moreover, the modulus of the pavement structural layer is determined by the material and structural characteristics, and its recommended empirical value or the value in the indoor test does not conform to the actual value of the site; by contrast, the inversion modulus obtained using the layer-by-layer inversion method is closer to the actual value, which can be used in the design of similar pavement structures to accumulate data for determining the material modulus or the pavement structure adjustment coefficient in the pavement structure.

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“…In recent years, multiple composite reinforced core columns can effectively guarantee the realization of "strong column and weak beam" and have good shear bearing capacity and seismic performance under earthquake action, which has attracted increasing attention of researchers. As the core index of seismic shear capacity is particularly important, many researchers have done a series of studies on it [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Calculation Model of Shear Capacity of Multiple Composite Core Column Joints Based on Softened Tension‐Compression Bar Model

Wentao

Yang

2021

Advances in Civil Engineering

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This paper aims to study the seismic performance of multiple composite core column joints. The influence of the stress mechanism, axial compression ratio, and shear span ratio on the failure mode, hysteretic performance, and shear capacity of the multiple composite core column joints was studied through the low-reversed cyclic loading tests of three specially designed and manufactured multiple composite core column joints. The angle ratio method is used to calculate the effective area of the vertical tie bar, and based on the mechanism of the softening tension-compression bar, the formula for calculating the shear capacity of the joint with multiple composite core column is established. In addition, it is also verified by the test data in this paper. The experimental results show that when the axial compression ratio increases from 0.26 to 0.45, the number and width of cracks at the beam end decrease. When the shear span ratio increases from 1.67 to 2.22, the number and width of cracks at the joint beam end increase. The average value and standard deviation of the ratio between the measured value and the calculated value of the shear capacity are 0.97 and 0.16, indicating that the proposed calculation method has a high agreement with the actual value and strong engineering application.

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Drilling signals analysis for tricone bit condition monitoring

Cited by 20 publications

References 14 publications

Numerical Simulation on Selection of Optimal Delay Time for Precise Delay Blasting

Numerical Simulation on Selection of Optimal Delay Time for Precise Delay Blasting

Modulus Inversion Layer by Layer of Different Asphalt Pavement Structures

Calculation Model of Shear Capacity of Multiple Composite Core Column Joints Based on Softened Tension‐Compression Bar Model

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