Impact Testing Machine Synchronization for Phase Shift Elimination
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Solution Overview
Problem
In impact testing machines, phase shifts between load measurement and image capture periods lead to unreliable analysis results due to the high-speed deformation of test pieces, which is more pronounced than in static load tests.
Innovation Solution
An impact testing machine is designed with a pulse generator that synchronizes the photographing instruction signal with the measurement sampling period, ensuring the video camera captures images in sync with the load measurement, thereby minimizing phase shifts and enhancing analysis reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the video camera operates independently with its own photographing sampling period, then the camera can capture images at its optimal frame rate, but a phase shift occurs between the load measurement sampling period and the photographing sampling period, deteriorating the reliability of analysis results
Solution Approach 1:
The system uses a synchronizing signal output unit that receives the measurement sampling period signal and generates a photographing instruction signal synchronized to it. This feedback mechanism ensures the video camera's photographing timing is continuously adjusted to match the load measurement timing, eliminating phase shifts and improving analysis reliability.
Solution Approach 2:
The synchronizing signal output unit pre-synchronizes the photographing instruction signal with the measurement sampling period before the actual measurement begins. By establishing this timing relationship in advance, the system prevents phase shifts from occurring during the impact test, ensuring accurate correlation between load and deformation data.
2Measurement precision
If the photographing frame rate is increased to capture high-speed deformation, then the deformation process can be recorded more accurately, but the synchronization complexity between measurement and photographing increases
Solution Approach 1:
The system merges the timing control of load measurement and image photographing by using a common synchronizing signal derived from the measurement sampling period. This unified timing approach allows high-frame-rate photographing to remain synchronized with measurement without requiring separate complex synchronization systems.
3Measurement precision
If the measurement sampling period is reduced to capture high-speed load changes, then the load measurement precision improves, but the photographing must be synchronized at a higher rate, increasing system complexity
Solution Approach 1:
The synchronizing signal output unit serves multiple functions: it generates the photographing instruction signal, maintains synchronization between measurement and photographing, and adapts to different sampling rates. This multi-functional component enables high-rate measurement without requiring separate synchronization systems for different operating conditions.
Data Source
AI summary
An impact testing machine is configured. The impact testing machine includes: a testing machine body that applies a load having a prescribed speed to a test piece and conducts a test; a controller that controls the testing machine body; a video camera that photographs the test piece; and a pulse generator. The controller includes: a detection signal capturing unit that captures a detection signal of the load in a prescribed measurement sampling period; and a synchronizing signal output unit that outputs a sampling synchronizing signal that is synchronized with the measurement sampling period. The pulse generator includes: a photographing instruction signal generator that generates a photographing instruction signal by multiplying or dividing the sampling synchronizing signal, and outputs the photographing instruction signal to the video camera. The photographing instruction signal issues a photographing instruction to the video camera.