1. Research background
The separation of the first and second stages is a key step in the flight stage of a multi-stage launch vehicle. It means that the rocket uses different engines in different flight stages and achieves weight reduction by discarding fuel-exhausted engine structural components, thereby efficiently delivering the payload. into a predetermined orbit.
Whether the new unlocking scheme for inter-stage separation is correct, whether the action mechanism is coordinated, whether the performance of related products involved in the separation process is effective, whether the servo system and auxiliary power system work normally after unlocking, etc., all need to be verified through scientific experiments.
Technological workers of a new launch vehicle used a binocular measurement scheme based on high-speed cameras to conduct visual observation tests, analyze attitude changes during the separation process, and numerically evaluate the new inter-stage separation unlocking scheme.
2. Experiment introduction
2.1 Test objectives
To simulate the inter-stage separation test, a high-speed camera and a motion analysis and measurement system are used to capture time-series images of attitude changes during the separation process and measure various dynamic parameters.
2.2 Test equipment and procedures
The first step: Set up a test site for separation between the first and second levels, and post a cross target on the test piece.
The second step: Calibrate the specimen using a total station.
The third step: Use Revealer high-speed camera to collect parameters at 1000fps/s @1920×1080 to record the motion separation and attitude change process of the specimen.
The fourth step: Use the Thousand Eyed Wolf motion analysis and measurement system to process the time series images and calculate the total displacement and Y-direction displacement component, velocity and Y-direction velocity component, acceleration and Y-direction acceleration component and other indicators.
The fifth step: Verify the test results and complete the evaluation report.
3. Test conclusion
The new solution for inter-stage separation and unlocking is correct, and the work of each system is coordinated and matched.
The working performance of unlocking products, energy separation, air circuit disconnection, cable disconnection, and impact reduction buffer devices is effective.
The impact environment during the separation process, the maximum frequency domain impact at the unlocking position is less than 2500g.
After unlocking, the servo system and auxiliary power system related products work normally, and the environmental design margin is large.
Attached product introduction
This inter-secondary separation test uses 2 Revealer small-sized and large-memory high-speed cameras to form a binocular measurement system for collection. The resolution is 1920x1080 pixels and can reach 3000 frames. The body size (W×H×D) is only 75×75 ×97mm, manufactured in strict compliance with GJB9001-2017 standards.
Revealer high-speed camera product map
Ultra high speed: 25000fps @1280×1024
Ultra HD: 1000fps @5120×4096
Large memory: up to 20TB real-time writing to SSD
Miniaturization: integrated body size 75×75×97mm
Real-time transmission: >4GB/s multi-channel CXP-12 interface
Accurate measurement: strain accuracy 20με and measurement accuracy 0.01pixel
Optoelectronic performance (sCMOS camera only): quantum efficiency 95% read noise 1e-
