Trampoline Performance Index via Accelerometer Drop Test
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Solution Overview
Problem
The lack of a standardized method for classifying trampoline performance makes it difficult to determine whether a trampoline has low or high performance, leading to inconsistent safety measures, as testing centers must decide based on the trampoline's use without a defined standard.
Innovation Solution
A method involving a test specimen with an integrated acceleration sensor dropped onto the trampoline's jumping mat, measuring maximum deceleration and climbing height to calculate a performance index, which classifies trampolines into high or low performance categories using threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standardized test method is implemented, then measurement precision and reproducibility are improved, but device complexity increases due to the need for specialized test specimens and sensors
Solution Approach 1:
A test specimen with integrated acceleration sensor serves as an intermediary between the trampoline system and the measurement equipment. This self-contained test specimen simplifies the overall measurement setup while ensuring consistent, reproducible results through standardized test procedures and defined specimen properties.
2Measurement precision
If multiple performance parameters are measured, then measurement precision is improved, but loss of time increases due to extended testing procedures
Solution Approach 1:
The acceleration sensor continuously records data throughout the entire rebound process, capturing multiple performance parameters (maximum deceleration, maximum climbing height, rebound characteristics) in a single continuous measurement sequence rather than through separate discrete tests.
Solution Approach 2:
Different performance parameters are derived from the same raw acceleration data by applying different analysis methods and calculation approaches, allowing multiple characteristics to be obtained from a single measurement without requiring additional testing time.
3Ease of operation
If a simple classification system is used, then ease of operation is improved, but measurement precision deteriorates due to insufficient performance differentiation
Solution Approach 1:
The performance index transforms multiple physical measurement parameters (deceleration, height) into a single dimensionless numerical value through a standardized formula, enabling simple threshold-based classification while preserving the ability to differentiate between various performance levels through the quantitative index values.
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 method allows for precise and reproducible determination of trampoline performance, enabling reliable classification and appropriate safety measures by forming a performance index from the ratio of maximum climbing height and deceleration, with empirical evidence supporting an exponential factor of 1.4.
Implementation Method 1
its maximum deceleration is determined using the acceleration sensor
Implementation Method 2
the test specimen hits the jumping mat, which then causes a restoring force when the test specimen is immersed in the jumping mat, which causes the test specimen to rebound
Implementation Method 3
the test specimen is dropped from this initial height onto the jumping mat, rebounds from the mat, and is then moved upwards again
Data Source
Figure 1~2
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AI summary
The invention relates to a method for determining the performance characteristics of a trampoline (1) with a jumping mat (3) mounted in a frame structure (2). A test specimen (15) with an integrated accelerometer (17) is positioned at an initial height (h1) above the jumping mat (3). The test specimen (15) is dropped from this initial height (h1) onto the jumping mat (3), where it rebounds and moves upward again. During this upward movement of the test specimen (15), its maximum deceleration (I) is determined by means of the accelerometer (17), and the maximum rise (h2) of the test specimen (15) is also determined. A performance index, characteristic of this trampoline (1), is calculated from the ratio between the maximum deceleration (I) and the maximum rise (h2). The invention further relates to an arrangement (8) for carrying out the method.