Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platforms
Instability and vibration of offshore platforms in harsh environmental force can be reduced by installing heave plates underneath of platform columns. Effect of parameters such as excitation Frequency and boundaries are investigated experimentally in this research. On the other hand, regarding to th...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Iranian Association of Naval Architecture and Marine Engineering
2019-01-01
|
| Series: | نشریه مهندسی دریا |
| Subjects: | |
| Online Access: | http://marine-eng.ir/article-1-699-en.html |
| _version_ | 1811275988612415488 |
|---|---|
| author | abuzar abazari mehdi behzad |
| author_facet | abuzar abazari mehdi behzad |
| author_sort | abuzar abazari |
| collection | DOAJ |
| description | Instability and vibration of offshore platforms in harsh environmental force can be reduced by installing heave plates underneath of platform columns. Effect of parameters such as excitation Frequency and boundaries are investigated experimentally in this research. On the other hand, regarding to the published papers, both the added mass and damping gradually increase versus vibration amplitude for a rigid heave plate. It is predicted that using a combination of a rigid disk in center and an elastic plate around it can increase the damping. It is generally observed from forced harmonic vibrations that frequency can decrease and increase hydrodynamic coefficients respectively near free surface and floor wall. Furthermore, frequency has considerable effect on the hydrodynamic coefficients of a rigid heave plate with large elastic part around it. This definitely depends on the excited mode shapes of the elastic edge. |
| first_indexed | 2024-04-12T23:47:23Z |
| format | Article |
| id | doaj.art-b83e920000fa4a9db2600d65db7fd99d |
| institution | Directory Open Access Journal |
| issn | 1735-7608 2645-8136 |
| language | fas |
| last_indexed | 2024-04-12T23:47:23Z |
| publishDate | 2019-01-01 |
| publisher | Iranian Association of Naval Architecture and Marine Engineering |
| record_format | Article |
| series | نشریه مهندسی دریا |
| spelling | doaj.art-b83e920000fa4a9db2600d65db7fd99d2022-12-22T03:11:49ZfasIranian Association of Naval Architecture and Marine Engineeringنشریه مهندسی دریا1735-76082645-81362019-01-0114283950Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platformsabuzar abazari0mehdi behzad1 Sharif Uni Sharif Uni Instability and vibration of offshore platforms in harsh environmental force can be reduced by installing heave plates underneath of platform columns. Effect of parameters such as excitation Frequency and boundaries are investigated experimentally in this research. On the other hand, regarding to the published papers, both the added mass and damping gradually increase versus vibration amplitude for a rigid heave plate. It is predicted that using a combination of a rigid disk in center and an elastic plate around it can increase the damping. It is generally observed from forced harmonic vibrations that frequency can decrease and increase hydrodynamic coefficients respectively near free surface and floor wall. Furthermore, frequency has considerable effect on the hydrodynamic coefficients of a rigid heave plate with large elastic part around it. This definitely depends on the excited mode shapes of the elastic edge.http://marine-eng.ir/article-1-699-en.htmlheave platehydrodynamic coefficientsboundary proximityfrequencyelastic-composite disk |
| spellingShingle | abuzar abazari mehdi behzad Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platforms نشریه مهندسی دریا heave plate hydrodynamic coefficients boundary proximity frequency elastic-composite disk |
| title | Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platforms |
| title_full | Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platforms |
| title_fullStr | Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platforms |
| title_full_unstemmed | Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platforms |
| title_short | Effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid–elastic heave plates in offshore platforms |
| title_sort | effects of free surface or floor wall on the hydrodynamic coefficients of the rigid and combined rigid elastic heave plates in offshore platforms |
| topic | heave plate hydrodynamic coefficients boundary proximity frequency elastic-composite disk |
| url | http://marine-eng.ir/article-1-699-en.html |
| work_keys_str_mv | AT abuzarabazari effectsoffreesurfaceorfloorwallonthehydrodynamiccoefficientsoftherigidandcombinedrigidelasticheaveplatesinoffshoreplatforms AT mehdibehzad effectsoffreesurfaceorfloorwallonthehydrodynamiccoefficientsoftherigidandcombinedrigidelasticheaveplatesinoffshoreplatforms |