Simplified diagram of behavior

  • Rolling

    Ship sways as if leaning left and right.

  • Pitching

    Ship sways as if leaning back and forth.

  • Yawing

    Ship sways as if veering left and right.

  • Heaving

    Entire ship sways as if moving
    up and down.

  • Swaying

    Entire ship sways as if moving
    left and right.

  • Surging

    Entire ship sways as if moving
    back and forth.

Configuration example of measuring

  • The GNAS motion sensor can sync with the analog signals of other installed sensors and perform measurements if it is connected to an analog converter.

  • The power source can be operated with 12V battery. Can log for long periods of time even without a PC if combined with a data logger.

Actual example with ship

  • Can measure position information during navigation, allowing for map plotting of navigation route.

  • Measured pitch and roll data is synced with position information, allowing you to measure the amount of swaying for a location.

Ship behavior during anchorage

  • Acceleration

    Can measure the vibration and shock acquired on the hull when swayed by engine balance or waves during anchorage. Shows added microscopic acceleration from all directions even when anchored.

  • Angular velocity

    Can measure rotational speed generated by rolling and pitching movements caused by waves. Wave periods are expressed as angular velocity.

  • Attitude angle

    Can measure hull inclination. Like angular velocity, you can see that the hull is linked with wave periods and regularly tilts in all directions.

Ship behavior during navigation (left rotation)

  • Acceleration

    You can see that there is considerable acceleration gained on the left and right. You can also see that centrifugal force is added to the left side of the hull during left rotation and it returns to its original movement again after rotation has finished.

  • Angular velocity

    You can see that it navigates while swaying left and right, rotates at a fixed rotation speed during rotation without much sway in any direction, and sways again to the left and right after rotation.

  • Attitude angle

    Although it is navigating horizontally without much inclination to either the front or back, you can see that it sways left and right for a fixed period. Left and right inclination is reduced during rotation and it navigates while again tilting to the left and right after rotation.

Wave period difference

  • At bay

  • Offshore