Rational selection of parameters of dynamic damper of longitudinal vibrations of liquid launch vehicle

Abstract

A significant increase in amplitudes of elastic longitudinal vibrations of a launch vehicle (LV) occurring in losses in longitudinal stability of liquid LVs may be responsible for an emergency. Measures for providing longi-tudinal stability are generally directed to the elimination of danger converging the proper frequencies of vibrations of the LV body and liquid propulsion system (LPS). Mounting a dynamical vibration damper (DVD) on LV, which is tunable to a danger frequency and damp-ens one, is an alternative way. The DVD does not dampen vibrations and only decreases their amplitudes (“sof-tens” the instability). However, mounting the DVD on the completed rocket is more simply than mounting damp-ers on its LPS. The problem resides in the fact that in determining the mass and location for mounting DVD on LV the ex-isting recommendations for selecting the DVD optimal parameters are not necessarily successful and the frequen-cy of longitudinal vibrations of the LV body, to which the DVD must be tuned, is changed in the LV flight. The determination of the DVD turning frequency becomes all the more complicated if longitudinal parame-ters with different frequencies occur in several sections of the LV flight. On the other hand, analysis of the DVD effects on longitudinal stability of LV is the challenge using a traditional mathematical model of a dynamic inter-action between the LPS and LV body. The paper presents an approach to determination of DVD parameters, based on a numerical study of the stability of a linear dynamical system of LSP and LV body with the DVD, using an improved mathematical model of a dynamic interaction between the LPS and the LV body with the DVD. The approach proposed is employed to determine parameters of the dynamic damper of longitudinal vi-brations of the three-stage liquid rocket, which loses its longitudinal stability in two sections of the flight. The selected values of DVD parameters provided a significant decrease in regions of divergent vibrations of the system of LSP and the LV body and coefficients of their divergence resulting in limitation of the possibility of evolution of these vibrations and in “softening” the system instability.

Authors and Affiliations

N. Khoryak

Keywords

Related Articles

Calcu- lating models for evaluation of stressed- strained conditions of bone tissue under total hip replacement

In the field of applied biomechanics the development of calculating models for studying the stressed-strained state of the bone tissue in a total hip remplacement, which provides man’s movement and withstands a load, is...

Methodological approach to technical and economic feasibility of projects for new space technology products

The work aim is to provide a theoretical foundation for developing a procedure of the estimation of effec-tiveness for space dual-use systems projects. The methodological approach to the feasibility study of scientific a...

Development and study of small-arms silencers

This paper presents the results of the research into the design and development of firearm silencers conduct-ed at the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space A...

Solution of inverse problems of gas dynamics of flat compressor cascades based on numerical simulation of turbulent flows

This paper presents a technique for solving inverse problems in gas dynamics of flat compressor cascades, based on a numerical simulation of turbulent flows. This technique is based on the application of quasi-solutions...

Mathematical model of interactions between railway and track considering distributions of contact forces throughout contact spots.

The work objective was to develop a mathematical model of interactions between the railway vehicle and the track considering the distribution of contact forces of the wheel-rail pair throughout contact spots. The meth...

Download PDF file
  • EP ID EP359136
  • DOI -
  • Views 79
  • Downloads 0

How To Cite

N. Khoryak (2014). Rational selection of parameters of dynamic damper of longitudinal vibrations of liquid launch vehicle. Технічна механіка, Техническая механика, Technical Mechanics, 3(3), 57-70. https://europub.co.uk/articles/-A-359136