On the stability of stay cables under light wind and rain conditions

Burton, David A.; Cao, D.Q.; Tucker, Robin; Wang, C.

doi:10.1016/j.jsv.2003.10.038

Cited by 10 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is justified and common for most of the abovementioned problems; e.g. impact of rain and wind on transmission lines and stay cables [19,20], and colloids on membranes [18] is usually modeled as time-periodic. Expanding f in a trigonometric Fourier series gives:…”

Section: Governing Equationsmentioning

confidence: 99%

“…This simple system is a generic model for various relevant problems, e.g. interaction between membranes and colloids in biochemistry [18], oscillations of transmission lines under action of rain and wind [19], and dynamics of suspension bridges and stay cables [20]. Moreover, it serves to reveal general effects of continuous spatially periodic modulations on oscillations of bounded structures subjected to distributed loading, and illustrates possible advantages and disadvantages of the proposed technique of vibration suppression.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vibration suppression for strings with distributed loading using spatial cross-section modulation

Sorokin

Thomsen

2015

Journal of Sound and Vibration

View full text Add to dashboard Cite

Document VersionPeer reviewed version Link back to DTU Orbit Citation (APA): Sorokin, V., & Thomsen, J. J. (2015). Vibration suppression for strings with distributed loading using spatial cross-section modulation. Journal of Sound and Vibration, 335, 66-77. DOI: 10.1016/j.jsv.2014.09.028 Vibration suppression for strings with distributed loading using spatial cross-section modulation Abstract A problem of vibration suppression in any preassigned region of a bounded structure subjected to action of an external time-periodic load which is distributed over its domain is considered. A passive control is applied, in that continuous spatially periodic modulations of structural parameters are used as a means for vibration suppression. As an example, stationary vibrations of a string under action of a distributed time-periodic load are studied. This system in a simplified form models such processes as interaction between membranes and colloids, oscillations of transmission lines under action of rain and wind, and dynamics of suspension bridges and stay cables. Suppression of vibration in predefined regions of the string is performed by continuous spatial modulation of its cross-section. For analyzing the problem considered a novel approach named the method of varying amplitudes is employed. This approach is applicable for solving differential equations without a small parameter, and may be considered as a natural continuation of the classical methods of harmonic balance and averaging. As a result, optimal parameters for the string cross-sectional area modulation are determined for the cases of harmonically, uniformly and arbitrarily distributed load, which allows for completely suppressing or considerably reducing vibration in the prescribed part of the string (compared to the case without modulation). vibration suppression; bounded structure; distributed loading; continuous spatially periodic modulation; the method of varying amplitudes.

show abstract

Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration suppression for strings with distributed loading using spatial cross-section modulation

Sorokin

Thomsen

2015

Journal of Sound and Vibration

View full text Add to dashboard Cite

show abstract

“…It has been previously suggested that the oscillation of the rivulets may magnify the aerodynamic forces and lead to a modified excitation mechanism (e.g. Flamand 1995;Matsumoto et al 1995Matsumoto et al , 2005aVerwiebe & Ruscheweyh 1998;Burton et al 2005). Burton et al (2005) simulated numerically the time-averaged drag on a two-dimensional cable with an oscillating water rivulet on the circumference of the cable for θ R = 20 • -70 • and found that the cable experienced a maximum time-averaged drag for θ R = 60 • -70 • , though the fluctuating forces were not reported.…”

Section: Fluid Forcesmentioning

confidence: 99%

“…Four approaches have been reported to simulate rivulets on a cable model (i) spray water shower onto the cable model to form rivulets in a wind tunnel (Hikami & Shiraishi 1988;Flamand 1995;Matsumoto et al 1995;Verwiebe & Ruscheweyh 1998); (ii) release water at the upper end of the cable model in a wind tunnel (Wang et al 2005); (iii) fix artificial stationary rivulets on the cable surface, used in both wind tunnel tests and numerical analysis (e.g. Yamaguchi 1990;Gu & Lu 2001); (iv) create artificial rivulets oscillating at the same frequency of a vibrating cable, which was used in numerical analysis (Cao, Tucker & Wang 2003;Wilde & Witkowski 2003;Xu & Wang 2003;Burton et al 2005) and also experimental investigations (Matsumoto et al 2005a).…”

Section: Introductionmentioning

confidence: 99%

Turbulent wake of an inclined cylinder with water running

Alam

Zhou

2007

J. Fluid Mech.

View full text Add to dashboard Cite

This paper presents the results of an experimental study of fluid dynamics around an inclined circular cylinder with and without water running over its surface, covering water rivulet formation, fluid forces on the cylinder, near wake and their interrelationships. The cylinder inclination angle (α) with respect to incident flow was between 55 • and 80 • . It has been found that water running over the cylinder surface may behave quite differently, depending on the Reynolds number (Re), and subsequently impact greatly upon the fluid dynamics around the cylinder. As such, five flow categories are classified. Category A: one water rivulet was observed, irrespective of α, at the leading stagnation point at a small Re. Category B: the rivulet splits into two, symmetrically arranged about the leading stagnation line, once Re exceeds a critical value that depends on α. The two rivulets may further switch back to one, and vice versa. Category C: two symmetrical straight rivulets occur. Category D: the two rivulets shift towards the flow separation line with increasing Re and oscillate circumferentially. The oscillation reaches significant amplitude when the rivulets occur at about 70 • from the leading stagnation point. This increased amplitude is coupled with a rapid climb in the mean and fluctuating drag and lift, by a factor of near 5 for the fluctuating lift at α = 80 • . Meanwhile, the flow structure exhibits a marked variation. For example, Strouhal number and vortex formation length decrease, along with an increase in spanwise vorticity concentration, velocity deficit, and coherence between vortex shedding and fluctuating lift. All these observations point to the occurrence of a 'lock-in' phenomenon, i.e. the rivulet oscillation synchronizing with flow separation. A rivulet-vortex-induced instability is proposed to be responsible for the well reported rain-wind-induced vibration associated with the stay cables of cablestayed bridges. Category E: the two rivulets shift further downstream just beyond the separation line; the shear layers behind the rivulets become highly turbulent, resulting in weakened vortex shedding, flow fluctuating velocities and fluctuating fluid forces. Based on the equilibrium of water rivulet weight, aerodynamic pressure and friction force between fluid and surface, an analysis is developed to predict the rivulet position on the cylinder, which agrees well with measurements.

show abstract

“…The noncircularity of the disc means that a non-trivial fluid torque, as well as a force, will be applied to it. An application to the coupled motion of a cable and an adhered rain rivulet induced by light wind and rain conditions on a cable-stayed bridge is given in [6]. To apply the discrete vortex method to the vortex-induced vibration of more than one object in an unbounded region, e.g.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic forces on two moving discs

Burton

Gratus

Tucker

2004

Theor appl mech (Belgr)

Self Cite

View full text Add to dashboard Cite

We give a detailed presentation of a flexible method for constructing explicit expressions of irrotational and incompressible fluid flows around two rigid circular moving discs. We also discuss how such expressions can be used to compute the fluid-induced forces and torques on the discs in terms of Killing drives. Conformal mapping techniques are used to identify a meromorphic function on an annular region in C with a flow around two circular discs by a Mobius transformation. First order poles in the annular region correspond to vortices outside of the two discs. Inflows are incorporated by putting a second order pole at the point in the annulus that corresponds to infinity

show abstract

On the stability of stay cables under light wind and rain conditions

Cited by 10 publications

References 20 publications

Vibration suppression for strings with distributed loading using spatial cross-section modulation

Vibration suppression for strings with distributed loading using spatial cross-section modulation

Turbulent wake of an inclined cylinder with water running

Hydrodynamic forces on two moving discs

Contact Info

Product

Resources

About