Drop Impact Tester with Adjustable Surface Angle
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Solution Overview
Problem
Existing drop impact testers struggle to accurately measure the impact experienced by test pieces due to variations in drop angle, which affects the impulse and impact angle, necessitating a method and apparatus capable of obtaining precise drop impact data based on the drop angle.
Innovation Solution
A drop impact tester and method that includes a holder for releasing a test piece in freefall, a drop angle measurement device using sensors like cameras, ultraviolet, or infrared sensors, and an impact measurement device that adjusts the impact surface angle to match the drop angle, ensuring accurate impact measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the impact surface angle is fixed, then the device structure is simple, but the measurement precision deteriorates due to drop angle variations
Solution Approach 1:
The impact surface is made movable rather than fixed, allowing it to dynamically adjust its angle to match the measured drop angle. This dynamic adjustment capability enables the system to maintain measurement precision across varying drop angles while managing structural complexity through controlled mobility.
Solution Approach 2:
The system changes the angular parameter of the impact surface to match the drop angle. By adjusting the impact surface angle as a variable parameter rather than keeping it fixed, the system achieves accurate impact measurements for different drop angles, directly resolving the precision-accuracy tradeoff.
2Measurement precision
If the impact surface angle is adjusted to match drop angle, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system employs a feedback mechanism where the measured drop angle is used to control the adjustment of the impact surface angle. This closed-loop feedback ensures that the impact surface automatically aligns with the appropriate angle for each drop, achieving high measurement precision without requiring complex manual intervention or over-engineered structures.
Solution Approach 2:
A controller acts as an intermediary between the drop angle measurement device and the impact surface adjustment mechanism. This intermediary component coordinates the angle adjustment process, simplifying the overall system architecture by decoupling the measurement and adjustment functions while maintaining precise control.
3Measurement precision
If multiple sensors are used for drop angle measurement, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system uses multiple types of sensors (camera, ultraviolet sensor, infrared sensor, laser sensor) that can all perform drop angle measurement functionality. This multi-functional approach allows the system to achieve high measurement precision through sensor redundancy and cross-validation, while the unified measurement purpose keeps the overall system complexity manageable.
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 solution enables precise measurement of drop impact by aligning the impact surface with the drop angle, reducing deviations in impact angle and providing accurate drop impact data, enhancing the reliability of impact tests for portable electronic devices.
Implementation Method 1
The drop angle measurement device may comprise at least one among a camera, an ultraviolet sensor, an infrared sensor, and a laser sensor
Implementation Method 2
the holder being further configured to release the test piece such that the test piece drops in freefall
Data Source
AI summary
A drop impact tester comprises a holder configured to hold a test piece and release the test piece such that the test piece drops in freefall; an impact surface disposed under the holder such that the test piece dropped from the holder hits the impact surface; and a drop angle measurement device configured to measure a drop angle which is a value correlated with an angle between a major surface of the dropped test piece and a reference plane. The tester further comprises an impact measurement device configured to move the impact surface from its first posing state to its second posing state to adjust an angle of the impact surface with respect to the reference plane based on the drop angle. The impact measurement device is configured to measure a drop impact applied to the impact surface by the dropped test piece or another test piece.