Spring-Loaded Impact Testing System for High-Frequency Shock Analysis
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Solution Overview
Problem
Existing methods for high-frequency shock testing of structures are unsatisfactory due to over-testing of low-frequency responses, difficulty in controlling impact force, and the need for specialized personnel and equipment, leading to insufficient repeatability and excessive testing.
Innovation Solution
A high-frequency impact testing system utilizing a mass, a potential energy storage system, and a hold-and-release mechanism to impart kinetic energy to a test structure, allowing for controlled and repeatable high-frequency shock testing, with sensors to measure and display the shock response spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large steel ball is dropped from a known height to create high frequency response, then the high frequency response is improved, but the low frequency response is over-tested
Solution Approach 1:
The patent employs a spring-loaded mechanism that can be adjusted to different compression levels, dynamically changing the impact energy and duration. This allows the same apparatus to achieve different frequency responses by adjusting the spring compression, thereby avoiding over-testing of low frequency while maintaining high frequency accuracy.
Solution Approach 2:
The patent changes the impact parameters by adjusting the spring compression distance and ball mass. By varying these parameters, the impact force and duration can be precisely controlled to match specific shock response spectrum requirements, enabling accurate testing across different frequency ranges without over-testing.
2Speed
If the drop height is increased to improve high frequency response, then the high frequency response is improved, but the terminal velocity of the ball is limited
Solution Approach 1:
The patent replaces the gravity-based drop mechanism with a spring-loaded mechanical system. The spring can be compressed to store potential energy that is then converted to kinetic energy, providing controlled impact forces that are not limited by gravitational acceleration or drop height. This substitution enables precise control of impact parameters independent of terminal velocity constraints.
3Force
If a gas-filled chamber is used to project an impacting projectile, then the impact force can be controlled, but the repeatability of the test is insufficient
Solution Approach 1:
The spring-loaded mechanism is designed to be self-resetting and self-measuring. The spring compression distance can be precisely set and reproduced, and the impact force is determined by the spring constant and compression distance rather than by gas pressure control. This self-service approach eliminates the need for complex gas chamber control systems and achieves superior repeatability.
4Force
If an explosive charge is used for testing, then the impact force is high, but the control difficulty and specialized requirements increase
Solution Approach 1:
The patent uses a simple, inexpensive spring-loaded mechanism with a reusable ball and target structure. This disposable-like simplicity eliminates the need for complex explosive charge handling, specialized personnel training, and expensive safety infrastructure. The test system becomes much simpler while maintaining the ability to generate high impact forces through controlled spring compression.
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 precise and repeatable high-frequency shock testing of structures, avoiding over-testing and requiring minimal specialized equipment, thus providing accurate and reliable results.
Implementation Method 1
a potential energy storage system (e.g., a spring-loaded mechanism) configured to store mechanical energy and, upon actuation, release the stored mechanical energy in the form of kinetic energy
Implementation Method 2
a hold-and-release mechanism (such as a permanent magnet) configured to releasably couple the mass to the potential energy storage system and impart linear momentum to the mass
Data Source
AI summary
An impact testing system for determining the shock response of a test structure includes a mass (e.g., a spherical steel ball) and a potential energy storage system (e.g., a spring-loaded mechanism) configured to store mechanical energy and, upon actuation, release the stored mechanical energy in the form of kinetic energy. A hold-and-release mechanism (such as a permanent magnet) is configured to releasably couple the mass to the potential energy storage system and impart linear momentum to the mass in connection with the kinetic energy such that the mass impinges upon the test structure. The shock response can then be determined and displayed to a user.