Multi-Axis Lifting Actuator for Offshore Topsides Heave Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for lifting and lowering topsides of varying sizes are inefficient and inflexible, particularly for smaller topsides, as they require expensive and cumbersome lifting apparatuses that are not commercially or operationally desirable, and do not effectively compensate for wave and tidal influences.
Innovation Solution
A vessel with a topside lifting arrangement featuring a lifting actuator that can rotate about multiple axes, including axes other than its actuating axis, allowing for precise positioning and control of the lifting device, which includes a barrel and piston mechanism with a guide tube for lateral load support, and multiple positioning actuators for enhanced maneuverability and load transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a floating crane or large lifting apparatus is used to lift topsides, then heavy loads can be lifted, but the device becomes expensive and cumbersome for smaller topsides
Solution Approach 1:
The lifting actuator is designed with rotational freedom about multiple axes, allowing it to dynamically adapt its orientation and position. This dynamic capability enables a single, simpler actuator design to handle various topside sizes and weights by adjusting its configuration rather than requiring different heavy-duty apparatus for each case.
Solution Approach 2:
The lifting actuator with multi-axis rotation capability serves multiple functions: it can lift topsides of various sizes, adjust to different support point positions, and accommodate vessel movements. This universal design replaces the need for specialized heavy lifting equipment for different applications.
2Adaptability or versatility
If traditional lifting methods are used, then topsides can be lifted, but flexibility in accommodating various topside dimensions and support points is limited
Solution Approach 1:
The actuator's ability to rotate about multiple axes provides dynamic adaptability to different topside geometries and support point configurations. This dynamic reconfiguration capability enables easy accommodation of various dimensions without complicating the operation, as the system naturally adapts to the load geometry.
3Reliability
If conventional lifting devices are used, then topsides can be lifted, but heave compensation (reduction in wave/tide influence) is insufficient
Solution Approach 1:
The lifting actuator with multi-axis rotation capability can dynamically respond to vessel movements caused by waves and tides. By rotating about multiple axes, the actuator maintains optimal positioning and loading conditions, providing passive heave compensation without requiring complex active control systems.
4Device complexity
If a simple and lightweight lifting device is used, then the construction is simplified, but the ability to lift various sizes of topsides is reduced
Solution Approach 1:
The simplicity of the lifting device is maintained through the use of a single actuator with rotational freedom rather than complex mechanical structures. The dynamic capability of rotating about multiple axes compensates for the simplicity, enabling the lightweight device to handle various topside sizes by adjusting its configuration rather than through structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and flexible lifting of topsides of various sizes with a simple and lightweight device, allowing for six degrees of freedom movement, improved heave compensation, and reduced preparation time, while minimizing the need for extensive deballasting and maintaining a low center of gravity.
Implementation Method 1
the second end (20) is rotatable around at least one axis other than the lifting actuator's actuating axis
Implementation Method 2
which includes a barrel and piston mechanism with a guide tube for lateral load support
Implementation Method 3
and multiple positioning actuators for enhanced maneuverability and load transfer
Implementation Method 4
providing excellent possibilities for heave compensation (reduction in the influence of waves or the tide on the floating equipment)
Data Source
Figure 1~2
Figure 3
AI summary
Disclosed is a topside lifting device (1) including: a lifting actuator (2) as a linear actuator having a first end (18) and a second end (20), wherein the second end (20) is engageable with a support portion (36) on a topside (28), wherein the second end (20) can rotate about the first end (18) around at least one axis, including an axis other than the lifting actuator's actuating axis.