Wyniki wyszukiwania dla: ROCKET

• Sounding rocket vibration mechanical filter and amplifier

  Publikacja

  • A. Dąbrowski
  • S. R. Krawczuk
  • J. Goczkowski
  • K. Pelzner

  - Rok 2021

  Measuring accelerations and vibrations of a sounding rocket provides both information for engineers on the launcher vehicle performance as well as environment description for future payload designers. Typically, information on the level of vibration and eigenfrequencies are required to properly design a payload. This paper presents a design of a novel mechanical filter and amplifier for mechanical vibrations. Its key feature is...

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• A device for measuring heat flux on a rocket skin surface

  Publikacja

  • A. Dąbrowski
  • R. Pietruszewska
  • S. R. Krawczuk

  - Rok 2021

  A novel method for measuring heat flux on a surface is presented. It is an extensive upgrade of currently known heat flux sensors used mostly in civil engineering. As the thermal environment of launchers, especially sounding rocket can have an enormous negative effect on payload, careful considerations have to be taken in the process of preparing insulation. Usually, thermal data provided by the launch vehicle manufacturer is limited...

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• Inverse heat transfer problem solution of sounding rocket using moving window optimization

  Publikacja

  • A. Dąbrowski
  • L. Dąbrowski

  - PLOS ONE - Rok 2019

  An Inverse Heat Transfer Problem is solved for a sounding rocket module given its geometry and measured temperature profile. The solution is obtained via moving window optimization, a technique for solving inverse dynamics. An analysis is performed to modify the method to avoid oscillatory behavior of the resulting heat flux profile. The method parameters are tuned in relation to characteristic phases of the flight. Results are...

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• JOURNAL OF SPACECRAFT AND ROCKETS

  Czasopisma

  ISSN: 0022-4650 , eISSN: 1533-6794

• Sounding rocket temperature and heat transfer data

  Dane Badawcze

  open access

  • A. Dąbrowski

  This dataset contains temperature and heat transfer data measured during REXUS 25 sounding rocket HEDGEHOG Experiment launched from Esrange Space Centre, Kiruna, Sweden. For experiment details, please see:

• Preliminary results from HEDGEHOG REXUS Project - sounding rocket experiment on accelerations, vibrations and heat flow

  Publikacja

  • A. Dąbrowski
  • K. Pelzner
  • S. R. Krawczuk
  • J. Goczkowski
  • A. Elwertowska

  - Rok 2019

  As access to space conditions becomes more available, both technically and economically, scientists' interest in launching finer and more sophisticated experiments grows. This applies now more than ever to fragile by nature biological and chemical experiments. To be qualified for launch, such experiments need to be carefully tested prior to the event. The tests should represent actual launch conditions as closely and in as detailed...

• Preliminary results from HEDGEHOG REXUS project – A sounding rocket experiment on accelerations, vibrations and heat flow

  Publikacja

  • A. Dąbrowski
  • K. Pelzner
  • S. R. Krawczuk
  • J. Goczkowski
  • A. Elwertowska

  - ACTA ASTRONAUTICA - Rok 2020

  During flight, a sounding rocket is subject to a unique environment - severe vibrations and substantial heat flux. In order to design payloads, precise measurement of these conditions is required. This paper presents preliminary results from HEDGEHOG REXUS Project, whose scientific goal was to characterise the thermal and dynamic environment of REXUS sounding rockets. For this purpose, two new sensors have been designed - mechanical...

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• Investigations of operational driving loads of bucket chains and manoeuvre hoisting winches on multi-bucket dredgers

  Publikacja

  • D. Bocheński

  - Polish Maritime Research - Rok 2008

  Artykuł dotyczy zagadnień wstępnego projektowania siłowni pogłębiarek wieloczerpakowych. Niniejszy artykuł przedstawia wyniki badań eksploatacyjnych sześciu pogłębiarek wieloczerpakowych. Badania eksploatacyjne obejmowały pomiary parametrów charakteryzujących warunki pracy dwóch podstawowych głównych odbiorników energii mechanicznej na pogłębiarkach wieloczerpakowych a mianowicie łańcuchów czerpakowych i zespołu wciągarek manewrowych....

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• Mechanical Properties of Aluminium Bracket Strengthening

  Publikacja

  • A. Ambroziak

  - Archives of Civil Engineering - Rok 2019

  The aim of the research is laboratory investigation of aluminium brackets employed to fasten lightweight curtain walls to building facilities. Tensile loads perpendicular to end plates (vertical) were applied here. The author focused on the solutions intended to increase the load-carrying capacity of aluminium brackets applying the plain washer form A (DIN 125; ISO 7089), plain washer with an outer diameter about 3d (DIN 9021;...

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• Effect of the Presence of the Lifting Pocket on The THD Performance of a Large Tilting-Pad Thrust Bearing

  Publikacja

  • M. Fillon
  • M. Wodtke
  • M. Wasilczuk

  - Rok 2014

  In this paper, an attempt was taken to study the effect of the lifting pocket on THD performance of a large tilting-pad thrust bearing of Itaipu power plant. B3earing performance was evaluated including recess shape for several cases of its depth. The results show, that hydrostatic recess changes calculated bearing properties quite significantly, especially in the vicinity of the pocket