Knowledge (XXG)

Ship motions

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97: 32: 222:. Heel refers to an offset that is intentional or expected, as caused by wind pressure on sails, turning, or other crew actions. The rolling motion towards a steady state (or list) angle due to the ship's own weight distribution is referred in marine engineering as list. List normally refers to an unintentional or unexpected offset, as caused by flooding, battle damage, shifting cargo, etc. 271: 192: 307:) motion. This motion is generated directly either by the water and wind motion, particularly lateral wave motion, exerting forces against the hull or by the ship's own propulsion; or indirectly by the inertia of the ship while turning. This movement can be compared to the vessel's lateral drift from its course. 250:
The turning rotation of a vessel about its vertical/Z axis. An offset or deviation from normal on this axis is referred to as deviation or set. This is referred to as the
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There are three special axes in any ship, called longitudinal, transverse and vertical axes. The movements around them are known as roll, pitch, and yaw respectively.
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is an imaginary line running horizontally across the ship and through the centre of mass. A pitch motion is an up-or-down movement of the bow and stern of the ship.
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The tilting rotation of a vessel about its longitudinal/X (front-back or bow-stern) axis. An offset or deviation from normal on this axis is referred to as
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There are methods for both passive and active motion stabilization used in some designs. They include static hull features such as
295:) motion imparted by maritime conditions, usually head or following seas, or by accelerations imparted by the propulsion system. 96: 112: 177:, is an imaginary line running horizontally through the length of the ship, through its centre of mass, and parallel to the 458: 44: 54: 48: 40: 284: 65: 169: 152: 135: 128: 183:. A roll motion is a side-to-side or port-starboard tilting motion of the superstructure around this axis. 412: 435:), "Principles of Naval Architecture", 1989, Vol. III, Pg.41, Section 3 - Ship Responses to Regular Waves 364: 259: 251: 379: 304: 358: 340: 219: 406: 418: 231: 230:
The up/down rotation of a vessel about its transverse/Y (side-to-side or port-starboard)
400: 336: 144: 20: 452: 391: 215: 200: 242:. A vessel that is pitching back and forth is usually termed to be hobby horsing. 440:
Theoretical background and application of MANSIM for ship maneuvering simulations
439: 394: – Tendency of the stern of a ship making way to swing toward the near bank 415: – Types of movement possible for a rigid body in three-dimensional space 385: 332: 288: 258:(or true heading if referenced to the true north pole); it also affects the 179: 147:. A yaw motion is a side-to side movement of the bow and stern of the ship. 421: – Study of the performance, stability, and control of flying vehicles 355: – Basic sailing maneuver, where ship turns its stern through the wind 143:, is an imaginary line running vertically through the ship and through its 270: 373: 255: 116: 101: 409: – Scale model a hydrodynamic test to predict full size behaviour 319:
vertical (up/down) motion; excessive downward heave can swamp a ship.
191: 316: 234:. An offset or deviation from normal on this axis is referred to as 432: 292: 269: 190: 95: 367: – Planar movement within a Euclidean space without rotation 352: 328: 403: – Ship response to disturbance from an upright condition 25: 438:
Sukas, Omer Faruk; Kinaci, Omer Kemal; Bal, Sakir (2019).
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Pages displaying short descriptions of redirect targets
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Pages displaying short descriptions of redirect targets
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Terms connected to the six degrees of freedom of motion
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that a ship, boat, or other watercraft, or indeed any
335:, or active mechanical devices like counterweights, 431:Society of Naval Architects and Marine Engineers ( 382: – Engineering discipline of marine vessels 53:but its sources remain unclear because it lacks 388: – Response of a vessel to sea conditions 8: 376: – Movement of an object around an axis 84:Learn how and when to remove this message 195:Axes of a ship and rotations around them 303:The linear transverse (side-to-side or 201:Euler angles § Tait–Bryan angles 7: 254:of the boat relative to a magnetic 100:Aircraft carrier rolling during a 14: 445:. Ocean Engineering, 192, 106239. 30: 1: 475: 361: – A sailing maneuver 198: 126: 18: 39:This article includes a 19:Not to be confused with 129:Aircraft principal axes 111:are defined by the six 68:more precise citations. 413:Six degrees of freedom 275: 196: 105: 365:Translation (physics) 273: 194: 99: 459:Nautical terminology 199:For other uses, see 170:longitudinal/X axis 380:Naval architecture 276: 197: 119:, can experience. 113:degrees of freedom 106: 41:list of references 359:Tacking (sailing) 153:transverse/Y axis 94: 93: 86: 466: 407:Ship motion test 397: 370: 89: 82: 78: 75: 69: 64:this article by 55:inline citations 34: 33: 26: 474: 473: 469: 468: 467: 465: 464: 463: 449: 448: 428: 419:Flight dynamics 395: 368: 349: 325: 313: 301: 287:(front/back or 281: 268: 248: 228: 212: 204: 189: 136:vertical/Z axis 131: 125: 90: 79: 73: 70: 59: 45:related reading 35: 31: 24: 17: 12: 11: 5: 472: 470: 462: 461: 451: 450: 447: 446: 436: 427: 424: 423: 422: 416: 410: 404: 401:Ship stability 398: 389: 383: 377: 371: 362: 356: 348: 345: 337:antiroll tanks 324: 321: 312: 309: 305:port-starboard 300: 297: 280: 277: 267: 264: 247: 244: 227: 224: 211: 208: 188: 185: 145:centre of mass 124: 123:Reference axes 121: 92: 91: 49:external links 38: 36: 29: 21:Ship movements 15: 13: 10: 9: 6: 4: 3: 2: 471: 460: 457: 456: 454: 444: 441: 437: 434: 430: 429: 425: 420: 417: 414: 411: 408: 405: 402: 399: 393: 392:Stern suction 390: 387: 384: 381: 378: 375: 372: 366: 363: 360: 357: 354: 351: 350: 346: 344: 342: 338: 334: 330: 323:Stabilization 322: 320: 318: 310: 308: 306: 298: 296: 294: 290: 286: 278: 272: 266:Translational 265: 263: 261: 257: 253: 245: 243: 241: 237: 233: 225: 223: 221: 217: 209: 207: 202: 193: 186: 184: 182: 181: 176: 172: 171: 165: 163: 159: 155: 154: 148: 146: 142: 138: 137: 130: 122: 120: 118: 114: 110: 103: 98: 88: 85: 77: 67: 63: 57: 56: 50: 46: 42: 37: 28: 27: 22: 326: 314: 302: 285:longitudinal 282: 274:Translations 249: 239: 235: 229: 213: 205: 178: 174: 168: 166: 161: 158:lateral axis 157: 151: 149: 140: 134: 132: 109:Ship motions 108: 107: 80: 71: 60:Please help 52: 341:stabilizers 333:bilge keels 283:The linear 240:out of trim 66:introducing 443:MANSIM Lab 426:References 386:Seakeeping 187:Rotational 162:pitch axis 127:See also: 117:conveyance 180:waterline 175:roll axis 453:Category 374:Rotation 347:See also 141:yaw axis 74:May 2022 260:bearing 256:compass 252:heading 102:typhoon 62:improve 317:linear 433:SNAME 329:skegs 311:Heave 293:stern 279:Surge 226:Pitch 173:, or 160:, or 139:, or 47:, or 353:Jibe 339:and 331:and 315:The 299:Sway 236:trim 232:axis 220:heel 216:list 210:Roll 167:The 150:The 133:The 289:bow 246:Yaw 238:or 218:or 455:: 343:. 262:. 156:, 51:, 43:, 291:/ 203:. 104:. 87:) 81:( 76:) 72:( 58:. 23:.

Index

Ship movements
list of references
related reading
external links
inline citations
improve
introducing
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typhoon
degrees of freedom
conveyance
Aircraft principal axes
vertical/Z axis
centre of mass
transverse/Y axis
longitudinal/X axis
waterline

Euler angles § Tait–Bryan angles
list
heel
axis
heading
compass
bearing

longitudinal
bow
stern

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