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Researchers design a system to reduce the noise of space rockets in the launch phase by Staff Writers Valencia, Spain (SPX) Jun 19, 2020
The thesis is focused on the research of methods that reduce the noise level of space rockets during the first phases of launching (engine ignition and takeoff). According to Ivan Herrero, at those times, the levels of acoustic pressure experienced by the space vehicles are extremely high and could seriously affect the light structures onboard, such as solar panels and antennas, making it necessary to reduce the noise levels. "During the launch of space rockets, over 150 dB of sound pressure level are reached at certain frequencies. It is the highest level sound event produced by a human being, only behind some natural events like an earthquake," explains Ivan Herrero. In addition, the intense sound generated by the primary sources, engine and jet increases due to reflection at the bottom of the rocket launch site, which acts like a mirror from the acoustic point of view, and gives the energy released back to the rocket and the structures onboard, implying economic and safety consequences.
Prototype "The presence of Helmholtz resonators, as well as their specific distribution, produces a reduction of the speed of sound diffusion. This is due to the friction of acoustic waves with the resonator walls, which produces a deceleration. The design of this system was done by optimizing a specific frequency range, which they have been able to reduce by an average of 20 decibels," explains Ivan Herrero. Despite of the importance of this problem, knowledge about the characteristics of the sources, the behavior of the ground installations regarding the sound diffusion and absorption, and the possible measures to mitigate the impact are still poor. The research work developed at the Gandia campus of UPV and the European Space Agency is in response to this need. The Ivan Herrero's thesis was directed by Ruben Pico Vila, Victor Sanchez Morcillo and Lluis Garcia Raffi, from the Universitat Politecnica de Valenca, and by Vicente Romero Garcia, from the Laboratoire d'Acoustique de l'Universite du Maine (France).
NPI PROGRAM During the thesis work, Ivan did two research stays in the European Space Research and Technology Centre (ESTEC) of ESA.
New US-UK agreement boosts UK's Spaceport plans Swindon UK (SPX) Jun 18, 2020 The UK and US governments have signed a new agreement paving the way for US companies to operate from UK spaceports and export space launch technology. UK Ambassador Dame Karen Pierce and U.S. Assistant Secretary of State for International Security and Non-proliferation, Christopher Ford, signed the US-UK Technology Safeguards Agreement, which will enable U.S. companies to participate in space launches from the United Kingdom, on Tuesday 16 June 2020. The Agreement means US space and technol ... read more
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