Vol 4, No 1 (2018): 22.02.2018

The main noise source in gas distribution systems is the gas pressure reduction in regulators. Nowadays the special mufflers, representing a set of orifices, are widely used for pressure regulator noise reduction. However, the installation of such devices may cause malfunction of the unit. That is why there is a need to study the characteristics of regulator with the muffler in order to select the parameters at which the desired pressure reduction is retained and the noise is reduced.
This paper studies the regulator which represents an equivalent of reduction valve of a similar scheme with the muffler installed in the outlet line. The output impedance increase may lead to loss of stability and control accuracy. The mathematical model of this system was implemented in the Simulink software in order to analyze the muffler impact on pressure relief valve static and dynamic characteristics. The program in Matlab software was also developed for determination of the noise generated by the system. The experimental research using the pneumatic bench was carried out for mathematical model verification.

At design of the space-rocket equipment the prediction problem of acoustic action on elements of the launch vehicle design and payload. The sources of such impact are the engines operating at the start and the incoming air flow acting on the launch vehicle at the start and on the active part of the flight in the earth's atmosphere. However, the solution of the problem, complications of the impossibility of testing in bench conditions. Check the adequacy of the selection process only when the launch vehicle. Therefore, it is important to develop a methodology for calculating the minimum sound insulation based on the physical parameters of the material and the geometric parameters of the structures. The calculation of these parameters was carried out on models of structures, in connection with which the proposed approach was called model. The simulation is carried out by the finite element method while simplifying the initial structure to a similar rigidity. The results were compared with experimental data.

To reduce the effects of external vibration disturbances, various methods of vibration protection are used, including active, semi-active and passive vibration isolation systems. For vibration isolation of modern precision equipment, it is proposed to use a plate-like vibration isolation based on magnetorheological elastomers. Studies of the frequency characteristics of this platform and its management capabilities are necessary to determine the effective modes of operation of the platform. Thanks to the tests on the vibration electrodynamic installation, the dependence of the coefficient of transfer of the amplitude of vibration displacement on the oscillation frequency at different currents was obtained and showed that the effective range of vibration isolation is from 38 to 100 Hz.