Vol 8, No 3 (2022): 03.10.2022
- Year: 2022
- Published: 03.10.2022
- Articles: 5
- URL: https://dynvibro.ru/dynvibro/issue/view/584
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Description:
опубликован 03.10.2022 г.
Full Issue
Articles
STRUCTURAL DIAGNOSTIC INDICATORS IN ASSESSING THE TECHNICAL CONDITION OF AIRCRAFT GAS-TURBINE ENGINE GEARBOXES
Abstract
The diagnostic indicators of defects in aircraft gas turbine engines based on the vibration intensity have several draw-backs. Quite significant is the error in estimating such intensity. Moving an engine from the test bench to the facility leads to an increase in vibration intensity, which cannot be taken into account when developing diagnostic methods in the conditions of the engine manufacturer's plant. The known dimensionless discriminants have generally a fairly complex structure. This study reveals the possibility of using structural diagnostic indicators as a simple ratio of two parameters. Based on the example of tooth flank wear and the side clearance value in the turboprop engine gearbox, we have demonstrated the possibility to assess its technical condition by the vibration parameters and signals from standard tachometric sensors of the input and output shaft rotation speeds.
6-11
EVALUTION OF THE INFLUENCE OF THE DESIGN OF THE FLOW PARTS OF PIPELINE VALVES ON NOISE AND VIBRATION ACTIVITY
Abstract
The article considers the implementation of designs of known samples of various types of flow parts of control pipeline valves in terms of their noise level in various operating modes. The hydraulic and acoustic characteristics of such flow parts have been studied. The range of tasks that need to be solved in the development of advanced flow parts with increased requirements for low noise has been determined. Technical solutions have been formulated to achieve a reduction in noise and vibration levels per unit of dissipated hydraulic power using accumulated experience and the latest technical solutions. The advantages and disadvantages of various designs are determined in terms of operational and functional characteristics. The main principles for the choice of design solutions are formulated, taking into account the noise and vibration characteristics to be laid, confirmed by the calculated data and the results of experimental studies of the flow parts. Directions for additional research are outlined.
12-19
THE IMPROVEMENT OF GTE-WHEEL OSCILLATION RECORDING PROCESS BY THE PANORAMIC-TYPE, NOISE-PROOF, DIGITAL SPECKLE-INTERFEROMETER
Abstract
The paper describes a mobile laser system based on a noise-proof digital speckle pattern interferometer for studying the coupled vibrations of the bladed wheels during engine development stage. The mechanical properties influence of the optical scheme elements of the speckle interferometer when recording information without vibration isolation is studied. It is noted an improvement in the quality of the obtained speckle interferograms with an increase in the construction rigidity of the diffusely scattering element of the speckle pattern interferometer.
20-30
DYNAMICS OF ROCKET ENGINE TURBOPUMP TURBINE SEAL CLEARANCE CHANGES
Abstract
The article considers changes of liquid rocket engine turbopump turbine seal clearance. During operation. significant change in clearance occurs in comparison with the clearance between rotor and stator seal elements during assembly. The current approach does not involve taking into account the effect of turbine seal clearance changing to the unit parameters and characteristics during design. The report presents an approach to the analysis of seal clearance change, depending by turbopump and engine operating mode.
31-41
INVESTIGATION OF THE STEERING DRIVE PERFORMANCE BY DYNAMIC CHARACTERISTICS
Abstract
The most effective way of non-destructive control of the technical condition of a complex hydro mechanical system such as a steering drive is diagnostics by dynamic characteristics. The diagnostic signs considered in this article are: dynamic values of the pressure and flow rate of the working fluid, as well as the speed of the spool movement and the shift of the rod under disturbing influences. On the example of the steering drive KAU-30B, the possibility of diagnosing the wear of elements of hydro mechanical systems based on the analysis of transients is shown.
42-47