Time-dependent analysis of cable domes using a modified dynamic relaxation method and creep theory

Kmeť, S.; Mojdis, Marek

doi:10.1016/j.compstruc.2013.04.019

Cited by 41 publications

(8 citation statements)

References 26 publications

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“…In order to simplify the model, an assumption was that no external force exist on the spring. There only exists the forces of tension force acted on the spring, and gravity, buoyancy and hydrodynamic force (drag force and lift force) acted on the mass points [11][12][13].…”

Section: A Numerical Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of the Midwater Trawl Dynamical Behavior Based on R Language

Li¹,

Zou²,

Zhang³

et al. 2015

Proceedings of the 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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The midwater trawl is used widely in many oceanic fisheries. In this study, the midwater trawl dynamical behavior was simulated and modeled with the mathematical mechanic equations based on R language platform. A lump-mass and spring method was used to build the physical model. The huge mathematical stiff differential equations were solved by an implicit algorithm. On the R platform, the programming, simulation and visualization of the model were done quickly. The three-dimensional dynamical behavior of the midwater trawl in steady flow was presented successfully and the effectiveness of this method was verified. And the results were accord with the actual measured data in the ocean.

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Section: A Numerical Modelingmentioning

confidence: 99%

“…And dt is time step and dt=t[n+1]-t[n]. Hence the improved euler method was used to solve the (12) and (13). And the improved euler method could be expressed as [ 1] [ ] [ 1] [ ] ( ( ) ( 1) ) 2 [ 1] [ ] ( ( ) ( 1 2…”

Section: Y Z Q U H X Y Z X Y Z T U G X Y Z Q U H X Y Z X Y Z T H H X mentioning

confidence: 99%

Modeling of the Midwater Trawl Dynamical Behavior Based on R Language

Li¹,

Zou²,

Zhang³

et al. 2015

Proceedings of the 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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show abstract

“…In most existing methods, few studies have been devoted to the vibrational characteristics of the cable-strut structures, and investigations have had to rely on numerical simulations instead of analytical solutions [1]. As a widely used form-finding method, the dynamic relaxation method addresses the pseudo-dynamic issue and finds the equilibrium configuration of cable-strut structures through the integration of a fictitious dynamic equation [28,4,14]. This technique, however, merely turns a static problem into a fictitious dynamic one.…”

Section: Introductionmentioning

confidence: 99%

Optimum self-stress design of cable–strut structures using frequency constraints

Lee¹,

Lee²

2014

International Journal of Mechanical Sciences

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“…Calì et al [21] proposed an original creep prediction model with a unified comprehensive formulation and utilized the ANSYS finite element model simulations for the model validation. Kmet et al used a modified nonlinear force-density method and a modified dynamic relaxation method to analyze the stress relaxation of cable nets [22][23][24]. Xu et al [25] considered the cable assembly as a whole and proposed a creep model based on the modified Norton-Bailey equation; however, it is difficult to apply this model as it involves too many parameters.…”

Section: Introductionmentioning

confidence: 99%

Modified Pre-stretching Assembly Method for Cable-Driven Systems

Zhang

Ren

et al. 2019

Chin. J. Mech. Eng.

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Soft cable-driven systems have been employed in many assembled mechanisms, such as industrial robots, parallel kinematic mechanism machines, medical devices, and humaniform hands. A pre-stretching process is necessary to guarantee the quality of cable-driven systems during the assembly process. However, the stress relaxation of cables becomes a critical concern during long-term operation. This study investigates the effects of non-uniform deformation and long-term stress relaxation of the driven cables owing to moving parts in the system. A simple closed-loop cable-driven system is built and an alternating load is applied to it to replicate the operation of transmission cables. Under different experimental conditions, the cable tension is recorded and the boundary data are selected to be curve-fitted. Based on the fitted results, a formula is presented to estimate the stress relaxation of cables to evaluate the assembly performance. Further experimental results show that the stress relaxation is mainly caused by cable creep and the assembly procedure. To remove the influence of the assembly procedure, a modified pre-stretching assembly method based on the stress relaxation theory is proposed and verification experiments are performed. Finally, the assembly performance is optimized using a cable-driven surgical robot as an example. This paper proposes a dual stretching method instead of the pre-stretching method to assemble the cable-driven system to improve its performance and prolong its service life. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Authors' ContributionsJL and SW were in charge of the whole trial; GZ designed the experiments and wrote the manuscript; XR assisted with experimental setup; KK finished the comparison experiment with the needle holder; JS assisted with data analysis. All authors read and approved the final manuscript.

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Time-dependent analysis of cable domes using a modified dynamic relaxation method and creep theory

Cited by 41 publications

References 26 publications

Modeling of the Midwater Trawl Dynamical Behavior Based on R Language

Modeling of the Midwater Trawl Dynamical Behavior Based on R Language

Optimum self-stress design of cable–strut structures using frequency constraints

Modified Pre-stretching Assembly Method for Cable-Driven Systems

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