Time-Dependent Reliability Analysis of Oil Derrick Structures in Mechanism Failure Mode

Zheng, Youqu; He, Dongsheng; Cheng, Yue; Li, Mo

doi:10.1007/s13296-020-00336-2

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Repeat steps ( 3) and ( 4) N times to obtain the stress matrix A of N strength analysis Step 6: Calculate the reliability index of each element by Python. In the reliability model of the finite element, the stress-strength limit state function Z i of the beam element in the derrick (element number is i, 0 < i ≤ M) is shown in Equation (10); see [17][18][19][20]. The safety margin Z i is a random variable, and it depends on the random variable of R (yield strength) and S i (stress of i-th element).…”

Section: Reliability Modeling Under Complex Loadmentioning

confidence: 99%

“…As described in step 3 in Section 2.2, sample x was obtained from random input variables. According to the relevant references [10,18], the random input variables of the reliability analysis include the material elastic modulus (EX), material yield strength (R), hook load (GZ), stand wind pressure (W z _L), and back wind pressure of each derrick section (W z (i) (i = 0, 1, 2, 3, 4)). The distribution types and numerical characteristics of the random variables are shown in Table 3.…”

Section: Numerical Plan and Parametersmentioning

confidence: 99%

“…Han et al [9] established a residual-life-prediction model based on time-varying reliability and the fatigue effect, which is applied to predict the residual life of the derrick structure by using the S-N curve and the rain-flow-counting method. Considering the weakness of the operational terms in the derrick structure strength, a time-dependent reliability analysis method was proposed and applied to the strength analysis of a towering derrick in [10]. A similar structural reliability analysis was also performed by relevant scholars.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Complex Load on the Strength and Reliability of Offshore Derrick by Using APDL and Python

et al. 2022

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In an offshore operational environment, complex loads such as the hook load, stand load and wind load play a crucial role in the structural strength and reliability of the offshore derrick. Previous studies have mainly focused on the effect of a specific load on the strength of the derrick by using commercial software. Therefore, the influencing mechanism of each complex load on the strength and reliability of the offshore derrick is urgently necessary to explore. Not only is the strength numerical model of the JJ315/45-K typical derrick established and conducted via APDL (ANSYS Parametric Design Language), but also the stress–strength reliability simulation is explored and plotted using Python code and APDL. Furthermore, the influence and contribution of each load to the strength and reliability is determined. With the increase in hook load, the positions of maximum reliability risk appear in section II-1. With the increase in stand load or back wind load, the positions of maximum reliability risk appear in the bottom section. In addition, with the decrease in the columns’ height, the stress proportion of the hook load decreases by 73.5%, the stress proportion of the stand load increases by 22.6%, and the stress proportion of the back wind load changes slightly. When the wind speed is less than 20 m/s, the hook load mainly affects the minimum reliability index of the derrick. Moreover, when the wind speed is more than 20 m/s, the back wind load mainly affects the minimum reliability index of the derrick. This study provides a thorough explanation of the strength distribution law and the reliability of derricks under complex loads.

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Section: Reliability Modeling Under Complex Loadmentioning

confidence: 99%

Section: Numerical Plan and Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Complex Load on the Strength and Reliability of Offshore Derrick by Using APDL and Python

et al. 2022

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“…Dynamic characteristic analysis has become a popular direction in the research of large headframes [13][14][15][16]. For the study of dynamic characteristic analysis, the experimental measurement method or the simulation calculation method can be used.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristic Analysis and Structural Optimization Design of the Large Mining Headframe

Liu

Huang

et al. 2022

Machines

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A large headframe is the core structure of a mine hoisting system. In the traditional design, only the static analysis under load is considered, resulting in the resonance phenomenon of the large headframe in later applications. In order to restrain the resonance phenomenon, a novel method for dynamic characteristic analysis and structural optimization design of a large headframe is proposed. First, the eigenfrequencies and vibration modes of the large headframe were obtained through modal analysis. The results showed that the numerical values of the multi-order eigenfrequencies of the system are relatively close. When subjected to alternating loads of similar frequencies, a large headframe is prone to the resonance phenomenon. Second, the steady-state vibration response of the large headframe was obtained through harmonic response analysis. The results showed that when the frequency of the alternating load is close to the first-order eigenfrequency, the vibration amplitude increases. Meanwhile, the fourth-order and the fifth-order eigenfrequencies are very close. When subjected to alternating loads of similar frequencies, the fourth-order and the fifth-order vibration modes of the headframe will be excited simultaneously. At this time, the headframe will have a strong resonance, which may cause structural damage and other problems. Finally, based on the above analysis, nine different structural optimization schemes are proposed in this paper. Through modal analysis and harmonic response analysis, the nine schemes were compared and analyzed, and the optimal scheme was eventually determined as scheme 9. The method proposed in this paper provides a new concept for the structural optimization design of a large mining headframe, and it has great significance for restraining the resonance phenomenon and ensuring the safety of mining operations.

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Hybrid reliability analysis of structures using fuzzy Bayesian interval estimation

Fang,

Zheng,

Wang

2024

Engineering Structures

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Time-Dependent Reliability Analysis of Oil Derrick Structures in Mechanism Failure Mode

Cited by 4 publications

References 32 publications

Influence of Complex Load on the Strength and Reliability of Offshore Derrick by Using APDL and Python

Influence of Complex Load on the Strength and Reliability of Offshore Derrick by Using APDL and Python

Dynamic Characteristic Analysis and Structural Optimization Design of the Large Mining Headframe

Hybrid reliability analysis of structures using fuzzy Bayesian interval estimation

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