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Article

The Effect of Manufacturing Quality on Rocket Precision

1
Croatian Military Academy “Dr Franjo Tuđman”, Ilica 256b, 10000 Zagreb, Croatia
2
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lucica 5, 10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Academic Editor: Fernando MAS
Aerospace 2021, 8(6), 160; https://doi.org/10.3390/aerospace8060160
Received: 23 April 2021 / Revised: 28 May 2021 / Accepted: 31 May 2021 / Published: 4 June 2021
The effect of manufacturing quality on rocket impact point dispersion is analyzed. The approach presented here applies to any type of rocket. Here, manufacturing quality is demonstrated for the unguided rocket, and by simulating four typical manufacturing errors: erroneously manufactured warhead, misalignment between the warhead and engine chamber, asymmetrically installed propellant, and error in nozzle manufacturing. A new methodology is proposed, which combines a 3D CAD model of the asymmetrical projectile (due to manufacturing errors) and the improved Six-degrees-of-freedom (6DOF) model of its flight into a comprehensive Monte-Carlo simulation. In that way, the rocket trajectory dispersion is correlated directly to the imperfection of the manufacturing process. Three quality levels are simulated (low, standard, and high quality), and each of the analyzed manufacturing errors depends on the chosen quality. The results show how important it is to impose the highest quality on nozzle manufacturing, and if this condition is not met, reveal if strict tolerances applied to other steps of the manufacturing process can compensate for the consequential drop of precision. View Full-Text
Keywords: rocket asymmetry; 6DOF model; Monte Carlo simulation; 3D CAD modelling; quality assurance; quality levels rocket asymmetry; 6DOF model; Monte Carlo simulation; 3D CAD modelling; quality assurance; quality levels
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MDPI and ACS Style

Trzun, Z.; Vrdoljak, M.; Cajner, H. The Effect of Manufacturing Quality on Rocket Precision. Aerospace 2021, 8, 160. https://doi.org/10.3390/aerospace8060160

AMA Style

Trzun Z, Vrdoljak M, Cajner H. The Effect of Manufacturing Quality on Rocket Precision. Aerospace. 2021; 8(6):160. https://doi.org/10.3390/aerospace8060160

Chicago/Turabian Style

Trzun, Zvonko, Milan Vrdoljak, and Hrvoje Cajner. 2021. "The Effect of Manufacturing Quality on Rocket Precision" Aerospace 8, no. 6: 160. https://doi.org/10.3390/aerospace8060160

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