Gearbox Converts Multiaxial Ocean Motion to Unidirectional Rotation
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Solution Overview
Problem
Conventional wave energy harvesting devices are inefficient due to their inability to effectively absorb and convert multiaxial translational and rotational motions into unidirectional rotational motion, leading to structural weaknesses and increased size and cost, as they only handle one or two ocean movements, necessitating excessive strengthening to withstand remaining forces.
Innovation Solution
A device that utilizes a gearbox to absorb and focus all ocean motions, including pitch, sway, yaw, surge, roll, and heave, into a single directional rotational motion, eliminating the need for structural reinforcement against non-absorbed forces and allowing the structure to be scaled based on the generator or motor resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional wave energy devices absorb only one or two ocean movements, then the device complexity is reduced, but the structural strength must be increased to withstand remaining forces from other directions
Solution Approach 1:
The gearbox is designed to handle all six degrees of freedom (surge, sway, heave, roll, pitch, yaw) simultaneously, making it a universal energy absorption system. This multi-functional approach allows the device to convert forces from any direction into useful rotational motion, eliminating the need for separate absorption mechanisms for each motion type and reducing overall structural complexity.
Solution Approach 2:
The gearbox acts as an intermediary mechanism between the multiaxial ocean forces and the unidirectional energy output. It mediates the conversion of complex multidirectional translational and rotational motions into simple unidirectional rotational motion, protecting the downstream components from direct exposure to complex multiaxial loading while maximizing energy capture.
2Reliability
If the device structure is strengthened to withstand all ocean forces, then the reliability increases, but the device size and weight increase
Solution Approach 1:
The gearbox serves as a protective intermediary that converts hazardous multiaxial forces into controlled unidirectional rotation. This allows the downstream energy conversion components to be optimized for their specific function without requiring excessive strengthening to handle complex multidirectional loading, thereby reducing overall device weight while maintaining reliability.
Solution Approach 2:
The system converts potentially harmful multiaxial forces that would otherwise require heavy structural reinforcement into beneficial unidirectional rotational energy. By capturing and utilizing forces from all six degrees of freedom, the device transforms what would be structural challenges into energy resources, reducing the need for heavy strengthening.
3Productivity
If the device absorbs all six degrees of freedom, then the energy harvesting efficiency improves, but the device complexity increases
Solution Approach 1:
The gearbox simplifies the complexity of handling all six degrees of freedom by providing a unified mechanical solution. Instead of requiring six separate absorption mechanisms, the gearbox integrates all force components into a single rotational output, maintaining high energy harvesting efficiency while avoiding the complexity of multiple independent systems.
Solution Approach 2:
The system merges all six degrees of freedom into a single unified energy conversion process. By combining surge, sway, heave, roll, pitch, and yaw motions through the gearbox mechanism, the device achieves comprehensive energy capture without the complexity of managing separate systems for each motion type.
4Volume of moving object
If the gearbox converts multiaxial motions to unidirectional rotation, then the structural size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The gearbox acts as a precision intermediary that handles the complex multiaxial to unidirectional conversion in a controlled manner. By concentrating the precision requirements into the gearbox component rather than the entire structure, the overall device size can be reduced while the manufacturing precision is focused on a specific critical component that can be optimized independently.
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
This solution enables efficient energy harvesting by converting all directional forces into unidirectional rotational motion, reducing structural complexity and cost, while ensuring the device can handle varying wave intensities without structural failure.
Implementation Method 1
a gearbox to convert multiaxial translational and rotational motions to unidirectional rotational motion to drive the generator
Implementation Method 2
operates a hydraulic motor that stores pressure energy in pressure vessels. The stored pressure is then released at a constant rate to run a hydraulic turbine / motor coupled to an electric generator
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3
AI summary
An energy harnessing device for harnessing wave energy that results in pitch, sway, yaw, surge, roll, and heave movement, wherein the device effectively converts multiaxial translational and rotational motion to unidirectional rotational motion for power transmission. It consists of multiple bevel gears arranged in a manner along with one-way bearings for the conversion to a unidirectional rotational motion.