Torque control of bolt tightening process through adaptive-gain second-order sliding mode

Wu, Zhimin; Zhang, Guigang; Du, Wen; Wang, Jian; Han, Fengyang; Qian, Dianwei

doi:10.1177/0020294020932354

Cited by 13 publications

(4 citation statements)

References 36 publications

(74 reference statements)

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“…An adaptive-gain second-order sliding mode controller (SMC) design was suggested to gain the required pre-load. The results were dramatically improved by applying an adaptive-again algorithm because the second-order SMC's sliding-surface parameters were the same as the specified control method [76]. It is further suggested to use an algorithm for a multi-bolt tightening technique that considers elastic interaction and gasket creep relaxation.…”

Section: Optimization Of Tightening Methodsmentioning

confidence: 99%

Optimization of Bolted Joints: A Literature Review

Croccolo,

De Agostinis,

Fini

et al. 2023

Metals

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Bolted joints are widely used in the aerospace and automotive industries due to their ease of assembly, disassembly and design flexibility. Optimizing threaded fasteners is essential to achieve uniform load distribution and minimize the number of bolts required, thereby reducing system cost and weight. This review paper aims at summarizing the five optimization techniques available in the literature, including bolt layout, tightening strategies, tightening sequences, bolt size, and stresses. The purpose is to emphasize the importance of optimizing bolted joints via the proper selection of materials, geometry, patterns, and bolt sizes, to obtain efficient joints with low assembly time while maintaining strength.

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Section: Optimization Of Tightening Methodsmentioning

confidence: 99%

Optimization of Bolted Joints: A Literature Review

Croccolo,

De Agostinis,

Fini

et al. 2023

Metals

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show abstract

“…Thus, the scatters of nut factors could be decreased. Wu et al [19] designed an adaptive-gain second-order sliding mode controller to conquer the adverse effects of the uncertainties during the torque control of bolt tightening process. Zhang et al [20] proposed an improved torque method based on a mathematical model for preload control in the precision assembly of miniature bolt joints.…”

Section: Introductionmentioning

confidence: 99%

Invention of smart tightening tool for directly controlling the preload of bolted joints

Zhang¹,

Liu²,

Gong³

et al. 2023

Smart Mater. Struct.

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Bolted joints are widely used in industries to connect and fasten two separated components. During the assembly of bolted joints, torque wrench is commonly employed to control preload indirectly. Much scatter in preload will occur and decrease the reliability of mechanical product. This study invented a novel tightening tool, which could directly control preload with high accuracy in the process of tightening bolts. The novel tightening tool is composed of an ameliorative intelligent wrench and signal processing system. There are two characteristics or innovations in the intelligent wrench. First, an electric tripping structure with multi-level small-size lever is designed to ensure that the target preload can be controlled effectively when the threshold value is reached. Second, an intelligent socket integrated with PZT sensor is designed, which can avoid many PZT sensors being sticked on bolt heads and greatly reduce cost. In the signal processing system, the waveform tracking strategy based on phase-locked loop is proposed to obtain the stable phase difference, which improves the robustness of the calculation of echo time. Three types of bolts with different sizes were tested. The average preload error was approximatively 2%, validating the accuracy and effectiveness of our tightening tool.

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“…Saman 14 took the nut dilation effect into consideration and proposed a novel 3D formulation for torque preload relationship for improving the tightening quality. What’s more, the neural networks, 15 fuzzy logical control, 16 and adaptive sliding control 17 are also used to improve the single bolt tightening quality.…”

Section: Introductionmentioning

confidence: 99%

Assembly method for two symmetrical bolt-bearing joints based on the tightening model and angle-eccentricity relationship

Fang

Luo

Xin

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper focused on the assembly of two symmetrically distributed bolt-bearing joints, both the single bolt tightening control and two bolts adjusting were studied. An improved assembly method for two annular parts connected by these two bolt-bearing joints was proposed to improve the tightening quality of these joints and the eccentricity between these two annular parts. First, the tightening process of single bolt-bearing joint was analyzed, and the mathematical model of the tightening process was established. Then, aiming to improve the tightening quality, an improved tightening control method for single bolt-bearing joint was proposed based on the mathematical model. Finally, the angle-eccentricity relationship was studied, and the eccentricity adjustment strategy based on the inverse sequence method was presented for adjusting the eccentricity between two connected parts. Considering that the measurement of the bearing preload is not convenient, the eccentricity was measured for indirectly reflecting the preload. The tightening experiments verified that the scatter of preload was obviously reduced under the improved tightening control method. The results of eccentricity adjustment experiments indicate that the eccentricity reduce gradually during the loosening and tightening process, and the eccentricity is less than 3.4 μm after adjustment process, which enough to meet the assembly requirements of the target groupware.

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Torque control of bolt tightening process through adaptive-gain second-order sliding mode

Cited by 13 publications

References 36 publications

Optimization of Bolted Joints: A Literature Review

Optimization of Bolted Joints: A Literature Review

Invention of smart tightening tool for directly controlling the preload of bolted joints

Assembly method for two symmetrical bolt-bearing joints based on the tightening model and angle-eccentricity relationship

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