Artificial Sport Log With Internal Baffles
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Solution Overview
Problem
Natural logs used in logrolling are cumbersome and difficult to transport due to their size and weight, and artificial logs have not effectively mimicked the physical characteristics of natural logs, such as buoyancy and mass moment of inertia, leading to subpar performance.
Innovation Solution
A lightweight, portable artificial log with a rigid foamed polymeric outer shell and a fixed internal baffle system that divides the log into symmetrical compartments, providing buoyancy and mass moment of inertia similar to natural logs, allowing for easy transportation and deployment when empty and filling with water for use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural logs are used for logrolling, then the physical characteristics (buoyancy and mass moment of inertia) are authentic, but the weight and portability are poor
Solution Approach 1:
The log is divided into multiple separate compartments by internal baffles, allowing the structure to be segmented into functional zones that can be independently filled or drained, enabling portability while maintaining authentic physical characteristics when in use
Solution Approach 2:
The log's weight and density parameters are changed by filling with water during use and emptying for transport, transforming it from a heavy natural log to a lightweight portable device while maintaining authentic buoyancy and mass moment of inertia characteristics
2Ease of operation
If artificial logs are made lightweight and portable, then the ease of transport is improved, but the behavioral physical characteristics fail to match natural logs
Solution Approach 1:
The log uses hydraulic principles by filling compartments with water to achieve authentic buoyancy and mass moment of inertia characteristics, allowing the artificial log to behave like a natural log when in use while remaining portable when empty
Solution Approach 2:
The log combines lightweight synthetic materials for the shell and baffles with water as a variable mass component, creating a composite structure that can transition between portable and authentic physical states
3Strength
If the internal baffle system is made rigid and fixed, then the structural strength is improved, but the device complexity increases
Solution Approach 1:
The internal volume is segmented by fixed rigid baffles into multiple compartments, providing structural strength and defining water containment zones while maintaining a relatively simple overall design
Solution Approach 2:
The baffles are designed with curved surfaces that follow the cylindrical geometry of the log, distributing structural loads efficiently and enhancing strength while maintaining aesthetic simplicity
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
The artificial log closely mimics the physical characteristics of natural logs, offering improved buoyancy and rotational stability while being significantly lighter and easier to transport, making it suitable for logrolling and other water sports.
Implementation Method 1
The thickness and density of the baffle in relation to the diameter of the shell determines the relative mass moment of inertia and buoyancy of the artificial log
Implementation Method 2
The thickness and density of the baffle in relation to the diameter of the shell determines the relative mass moment of inertia and buoyancy of the artificial log
Data Source
AI summary
A lightweight, portable artificial sport log having physical properties that mimic a selected natural log is disclosed that has a hollow cylindrical shell of a suitable polymeric material defining a volume having the desired dimensions of length and diameter of a selected natural log of interest, an internal baffle support shape of a rigid polymeric foam material is fixed to said internal surface of said cylindrical shell, end closure members at ends of said hollow cylindrical shell provided with sealable fill/discharge openings for adding and draining water from the artificial log. The internal baffle volume and shape are determined such that the buoyancy of the artificial log generally equals the buoyancy of the natural log of interest and the mass moment of inertia resembles that of the natural log of interest when the artificial log is filled with water.