Change search
ReferencesLink to record
Permanent link

Direct link
Model Experiment Addressing the Impact Pressure Distribution on Planing Craft in Waves
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-8343-5098
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-9110-9401
2004 (English)In: International Journal of Small Craft Technology, ISSN 1740-0694, Vol. 146Article in journal (Refereed) Published
Abstract [en]

The aim of the experiment was time-domain monitoring and analysis of the pressure distribution on planing craft inwaves. A model was instrumented with pressure transducers and towed in calm water, head and oblique regular andirregular waves. The transducers were concentrated to a fore matrix to capture the impact loads and an aft matrix tofollow the pressure in the transom area. In waves, the propagation of the pressure enabled a reconstruction of the impactpressure distribution time history from the transducer signals. The impact loads determined as the integratedreconstructed pressure were compared with inertia forces determined from accelerometer signals. Correlation was clearand verified the reconstruction method and the instrumentation in terms of transducer matrix position, size and density.Besides pressure and accelerations, rigid body motions, speed, wave height and resistance were measured. The paper describes the set-up, discusses difficulties concerning model hull rigidity, sampling frequencies and signal analysis, and shows on characteristic results. The paper concludes that detailed time-domain studies of the impact pressure distribution are accessible from the set-up and the suggested analysis methods.

Place, publisher, year, edition, pages
2004. Vol. 146
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-4965DOI: 10.3940/rina.ijsct.2004.b1.15041OAI: diva2:7254
Available from: 2004-10-08 Created: 2004-10-08 Last updated: 2011-09-20Bibliographically approved
In thesis
1. Modeling of planing craft in waves
Open this publication in new window or tab >>Modeling of planing craft in waves
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Simulation of the planing hull in waves has been addressed during the last 25 years and basically been approached by strip methods. This work follows that tradition and describes a time-domain strip model for simulation of the planing hull in waves. The actual fluid mechanical problem is simplified through the strip approach. The load distribution acting on the hull is approximated by determining the section load at a number of hull sections, strips. The section-wise 2-dimensional calculations are expressed in terms of added mass coefficients and used in the formulations of both inertia and excitation forces in the equations of motions. The modeling approach starts from the hypothetic assumption that the transient conditions can be modeled based on those section-wise calculations. The equation of motion is solved in the time-domain. The equation is up-dated at each time step and every iteration step with respect to the momentary distribution of section draught and relative incident velocity between the hull and water and catches the characteristic non-linear behavior of the planing craft in waves.

The model follows the principles of the pioneering work of E. E. Zarnick differing on model structure and in details such as the modeling of the lift in the transom area. A major part of the work is concerned with experiments and evaluation of simulations with respect to performed model tests and to published experiment data. Simulations of model tests have been performed and comparisons have been made between measured and simulated time series. The link between simulation and experiment is a wave model which is based on a wave height measurement signal. It is developed and evaluated in the thesis.

The conclusions are in favor of the 2-dimensional approach to modeling the conditions for the planing hull in waves and among further studies is evaluation of simulated loads and motions to full-scale trial measurement data.

Place, publisher, year, edition, pages
Stockholm: Farkost och flyg, 2004
Trita-AVE, ISSN 1651-7660 ; 2004:34
Hydraulic engineering, marine, ocean, Planing craft, time-domain simulation, design loads, Vattenteknik
National Category
Water Engineering
urn:nbn:se:kth:diva-14 (URN)91-7283-861-2 (ISBN)
Public defence
2004-10-14, Kollegiesalen, KTH, Valhallavägen 79, Stockholm, 10:00
Available from: 2004-10-08 Created: 2004-10-08 Last updated: 2012-03-20

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Rosén, AndersGarme, Karl
By organisation
Aeronautical and Vehicle Engineering
Vehicle Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 383 hits
ReferencesLink to record
Permanent link

Direct link