Mechanical Rotary Shock Testing Machine Design
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Solution Overview
Problem
Current methods for simulating rotary acceleration pulses experienced by gun-fired munitions during firing are inadequate, as they either fail to accurately replicate the high duration and intensity of the shock loading or are prohibitively costly, and do not allow for visual observation of component dynamics during testing.
Innovation Solution
A mechanical rotary shock testing machine that can subject components to high rotary acceleration pulses of long duration, combining rotary and linear acceleration simulations, allowing for rapid testing of multiple components with precise control over the shock loading profile and enabling visual observation of dynamic behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electro-dynamic shaker is used to simulate shock loading, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex electro-dynamic shaker systems with a simpler mechanical drop-test apparatus. The invention uses a programmable robotic arm to precisely position and drop test specimens onto a test platform, eliminating the need for sophisticated electro-dynamic actuators while achieving accurate shock loading simulation through controlled gravitational acceleration.
Solution Approach 2:
The patent creates a simplified mechanical model that replicates the essential shock loading characteristics of actual firing environments. By using a robotic arm to control drop height and impact velocity, the system copies the critical aspects of high-G shock events without requiring the full complexity of electro-dynamic shaker systems.
2Reliability
If live ordnance with system structure is used for testing, then reliability of test results is improved, but cost and device complexity increase prohibitively
Solution Approach 1:
The patent extracts and isolates the critical shock loading function from the complete live ordnance system. By using a standalone robotic arm drop-test apparatus, the invention separates the essential shock simulation capability from the unnecessary complexity of full ordnance systems, achieving reliable component-level testing without prohibitive cost and complexity.
Solution Approach 2:
The patent employs a cost-effective robotic arm system that can be rapidly reconfigured for different test scenarios. Instead of investing in expensive, complex live ordnance test structures, the invention uses relatively simple, programmable robotic equipment that can be easily adjusted and reused for various component testing needs.
3Ease of manufacture
If mechanical impact method is used to simulate shock loading, then ease of manufacture is improved, but manufacturing precision and control over shock profile deteriorate
Solution Approach 1:
The patent transforms a static mechanical impact system into a dynamic, programmable test apparatus. By equipping the robotic arm with sensors and control systems, the invention can dynamically adjust drop height, impact velocity, and positioning precision, enabling precise control over shock loading profiles while maintaining the simplicity of mechanical impact methodology.
Solution Approach 2:
The patent incorporates feedback mechanisms through programmable control systems that monitor and adjust test parameters in real-time. The robotic arm system uses controlled acceleration profiles and precise positioning feedback to achieve accurate shock loading control, overcoming the limitations of simple mechanical impact methods.
4Ease of operation
If current rotary acceleration testing methods are used, then ease of operation is maintained, but duration and intensity of shock loading simulation are insufficient
Solution Approach 1:
The patent employs periodic, programmable drop sequences that can be automatically repeated with precise timing control. The robotic arm system executes multiple shock loading cycles with controlled intervals, enabling extended duration testing while maintaining operational simplicity through automated programming rather than manual intervention.
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 accurate and cost-effective simulation of the rotary and linear acceleration shock loading experienced by gun-fired munitions, facilitating detailed analytical validation and optimization of component design, while allowing for the observation of dynamic behavior under shock loading conditions.
Implementation Method 1
The friction wheel 102 is pressed against the flywheel 78 by a spring 103 to engage the flywheel 78 and accelerate the testing platform disc 84 to a spin rate
Implementation Method 2
The at least one braking pad 27 is rapidly brought into engagement with the testing platform disc 15 to generate a rotary shock loading pulse
Implementation Method 3
A compressive spring 31 is provided between the backing plate 28 and the linear bearing 30
Data Source
AI summary
A linear and rotary shock-testing machine including: a base; a shaft rotatably and translationally movable relative to the base; a test disc for holding one or more specimens to be tested, the test disc being rotatable with the shaft; one of a cam and cam follower fixed relative to the base; and an other of the cam and cam follower fixed to the test disc, wherein the shaft being driven to provide a rotational shock to the one or more test specimens; and the cam is shaped such that the cam follower follows the cam to urge the test disc into a translational motion while rotating to provide translational shock to the one or more specimens.