Bending characteristics of the reinforced S-shaped bellows under internal pressure

Huo, Shihui; Yan, Wenzhong; Xu, Xuejun; Yuan, Zhe

doi:10.1016/j.ijpvp.2021.104412

Cited by 13 publications

(4 citation statements)

References 6 publications

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“…Hua et al [17] studied the stiffness characteristics of bellows-type hoses and explored their mechanical model when reaching balance under internal pressure. Huo et al [18] researched the displacement compensation ability of reinforced S-shaped bellows under different stiffness and analyzed its vibration reduction effect. Gawande et al [19] found that reducing the axial natural frequency of U-shaped bellows can avoid resonance through analyzing their dynamic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Flexibility Analysis and Experimental Design of Dual-Chamber Bellows Isolator for Low-Frequency Damping Performance

Cao

Sun

Du³

et al. 2023

IEEE Access

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To achieve an effective and versatile solution for reducing vibrations and reducing maintenance costs, the dual-chamber flexible bellows isolator (D-CFBI) of rubber material is designed. The outer chamber of D-CFBI is used as an actuator to change its own variable stiffness and control the feedback force by filling negative pressure gas. The inner chamber is used as a rubber air spring to work as the main vibration isolation element. Under different loads and sinusoidal excitation forces, the damping characteristics and damping effects of the D-CFBI with different stiffness are investigated. By exciting the isolator, the frequency sweep experiment is carried out, the dynamic flexibility in the initial state is studied, and a preload of the D-CFBI is given to change the stiffness of the D-CFBI, and the changing trend between restoring force and amplitude and frequency is found out. Conclusions can be summarized that increasing the preload of the D-CFBI leads to increased stiffness and better damping effect. For compression amounts of 20% and frequencies higher than 7Hz or amplitudes lower than 2mm, the damping effect is also better. Consequently, this D-CFBI offers satisfactory damping and increased safety at low amplitudes and frequencies. To achieve optimal damping, it is recommended to adjust the stiffness of the driver.

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Section: Introductionmentioning

confidence: 99%

Flexibility Analysis and Experimental Design of Dual-Chamber Bellows Isolator for Low-Frequency Damping Performance

Cao

Sun

Du³

et al. 2023

IEEE Access

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“…Yuan et al [12] put forward a theoretical analysis of reinforced S-shaped bellows and discussed the mechanical behavior of bellows under different loads. Huo et al [13] studied the bending performance of reinforced S-shaped bellows under a pressured load by a mathematical method and numerical simulation analysis. Jiang et al [14] presented fittability to appraise the convolution shape precision of bellows and investigated the effect of different load types on the wall thickness and fittability of bellows.…”

Section: Introductionmentioning

confidence: 99%

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

et al. 2022

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The aero ball joint is pivotal in aircraft duct systems due to its favorable properties, including displacement compensation and flexibility. In the stress assessment of air ducts, ball joints are usually simplified by using “Joints” connections to reduce the convergence problems caused by non-linearity, which requires a high degree of accuracy in the characteristic parameters of the ball joint. Accordingly, this paper builds a high temperature and pressure fatigue test platform to investigate the bending characteristics of the ball joint at different temperatures and pressures and points out the limitations of the current method. Then, a method combining finite element analysis (FEA) and the BP neural network is proposed to obtain the characteristic parameters of the ball joint. The results showed that the bending process of the ball joint tended to have two typically different stiffness properties, which were high rigidity and low rigidity. The bending characteristics were strongly influenced by pressure, but less influenced by temperature. The existing test platform increased the force reaction at the contact areas of the ball joint, resulting in errors in the measurement of characteristic parameters. The BP neural network prediction method could effectively alter the ball joint properties and reduce errors.

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“…However, the existing minimum bending radius is not sufficient to analyse the deformation state of bellows quantitatively during ultimate bending. Huo et al 12 studied the bending characteristics of S-shaped bellows under internal pressure by theoretical analysis with numerical simulation. They found three different mechanical behaviour characteristics in the whole bending, namely, high rigidity, low rigidity and sharp rigidity increase states.…”

Section: Introductionmentioning

confidence: 99%

Ultimate bending performance and fatigue life of U-shaped metal bellows

Hao

Chen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Metal bellows used in the flexible connection of metallurgical converter oxygen lance compensates for pipeline displacement through its bending deformation, and adjacent waveforms in the concentrated deformation area are squeezed, resulting in premature fracture. The bending geometric model of U-shaped metal bellows is established in this paper, and the geometric relationship between waveform structure parameters and ultimate bending radius is derived. Moreover, a mathematical model of bending moment (M) with bending angular displacement (θ) about wave height H and wave crest fillet radius Rc is established. Then, combined with Fe-safe fatigue life analysis software, the fatigue life and failure location of metal bellows are obtained. The optimal waveform parameter design range of DN80 metal bellows with high repeated bending fatigue life under large bending is determined. Finally, the bending performance and fatigue life of bellows are tested on a bending fatigue testing machine. The distribution law of fatigue life and the propagation law of cracks at the wave trough of metal bellows under different bending angular displacement amplitudes are obtained. The crack propagation mechanism and fracture mechanism under different displacement amplitudes are revealed by a scanning electron microscope. In the engineering application of large bending, the pipeline failure caused by the ultimate bending deformation of metal bellows can be avoided according to the prediction results of fatigue life.

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Bending characteristics of the reinforced S-shaped bellows under internal pressure

Cited by 13 publications

References 6 publications

Flexibility Analysis and Experimental Design of Dual-Chamber Bellows Isolator for Low-Frequency Damping Performance

Flexibility Analysis and Experimental Design of Dual-Chamber Bellows Isolator for Low-Frequency Damping Performance

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

Ultimate bending performance and fatigue life of U-shaped metal bellows

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