Irregular Wave Loading on a Conical Structure

Jamieson, W.W.; Mansard, E.P.D.; Mogridge, G.R.

doi:10.1061/9780872626874.168

Cited by 1 publication

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“…Spectral density measurements for irregular and regular wave loading for deep-water waves (a relative depth of 0.51) in Figure 7 show the emergence of strong nonlinearities in the forces which are not present in the incident wave spectrum. The results for the regular wave test in Figure 7 are similar to those published previously for regular waves by Jamieson et al (1985). For the horizontal and vertical forces, the spectral density plots show very little response at the fundamental frequency (1.34 Hz) of the incident waves; most of the response is at the second harmonic (2.68 Hz).…”

Section: Spectral Densities Of Wave Loadingsupporting

confidence: 86%

“…The regular wave loading results reported by Jamieson et al (1985) for horizontal and vertical force, as well as the regular wave force results shown in Figure 7, do not show a similar shift of response because there is no interaction between frequency components.…”

Section: Spectral Densities Of Wave Loadingmentioning

confidence: 76%

“…In the previous paper by Jamieson et al (1985) it was observed that for regular deep-water waves, the wave loading was predominantly at the second-harmonic frequency of the waves (particularly for the horizontal and vertical wave forces). In that paper there was a brief discussion of previous reportings of second-order pressure fluctuations which do not attenuate with water depth, i.e.…”

Section: Spectral Densities Of Wave Loadingmentioning

confidence: 94%

“…In the paper by Jamieson et al (1985), it was observed that in addition to the wave frequency, the structural shape is important in determining whether second-harmonic forces and moments will appear.…”

Section: Spectral Densities Of Wave Loadingmentioning

confidence: 99%

“…Isaacson (1982) has published some results of numerical calculations for the case of a surface-piercing 45° conical structure utilizing the body's vertical axisymmetry to reduce considerably the computational effort required for bodies of arbitrary shape. Jamieson et al (1985) have carried out regular wave loading measurements on a model of a surfacepiercing 45° conical structure.…”

Section: Introductionmentioning

confidence: 99%

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Irregular Wave Loading on a Conical Structure

Jamieson¹,

Mansard²,

Mogridge³

1988

Int. Conf. Coastal. Eng.

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The horizontal forces, vertical forces and overturning moments exerted by waves on a fixed model of a 45" conical structure are presented. Irregular wave loading tests were conducted for a range of conditions described by base diameter on peak period wave length D/Lp from 0.31 to 1.76, water depth on peak period wave length h/Lp from 0.11 to 0.63, and significant wave height on peak period wave length Hm./Lp up to 0.07. Time series records, spectral densities and transfer functions for the irregular wave loading tests are used to illustrate the nonlinear nature of the measured wave loads. In most cases, similar trends in wave loading were observed for irregular and regular wave tests. For deep-water waves, the irregular and regular force measurements showed spectral peaks at the second harmonic of the wave frequency even though the waves themselves had relatively small second-order components. However, unlike the regular wave loading results, the fundamental spectral peak frequency for the irregular wave forces occurred at a frequency considerably lower than the peak frequency of the waves. Although linear diffraction theory provided a reasonable estimate of the wave forces for waves of low steepness, larger deviations were often present for higher wave steepness results. Comparison of theory and experiment for overturning moments was generally very poor for most wave conditions.

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Section: Spectral Densities Of Wave Loadingsupporting

confidence: 86%

Section: Spectral Densities Of Wave Loadingmentioning

confidence: 76%

Section: Spectral Densities Of Wave Loadingmentioning

confidence: 94%

Section: Spectral Densities Of Wave Loadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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