SU781656A1

SU781656A1 - Apparatus for measuring discrete components of compressor rotor acoustic oscillations

Info

Publication number: SU781656A1
Application number: SU792707666A
Authority: SU
Inventors: Виктор Петрович Максимов; Вячеслав Иванович Поварков
Original assignee: Предприятие П/Я В-2504
Priority date: 1979-01-04
Filing date: 1979-01-04
Publication date: 1980-11-23

Description

1one

Изобретение относитс к измерени м акустических ко.Г1ебаний и, в част ности, к измерению акустических коле баний компрессоров газотурбинных двигателей.The invention relates to the measurement of acoustic room oscillations and, in particular, to the measurement of the acoustic oscillations of compressors of gas turbine engines.

Известно устройство дл измерени дискретных составл н аих акустических колебаний ротора, содержащее регистрирующий блок и цепь измерени акустических колебаний рабочих колес, включающую последовательно соединенные микрофон, установленный на корпусе компрессора, и полосовой фильтр l}.A device for measuring discrete components of the rotor's acoustic oscillations is known, comprising a recording unit and a circuit for measuring the acoustic oscillations of the impellers, including a series-connected microphone mounted on the compressor housing, and a band-pass filter l}.

Недостатками .устройства вл етс то, что измер етс только одна ссх:тавл юиа , поочередное переключение фильтров требует больших затрат времени , а чувствительность к далеко расположенным от микрофона рабочим колесам компрессора недостаточна.The disadvantages of the device are that only one ccx is measured: the pressure, alternating filter switching takes a lot of time, and sensitivity to the impellers of the compressor that are far from the microphone is insufficient.

Целью изобретени вл етс повышение точности и сокращение времени измерени . .The aim of the invention is to improve the accuracy and reduce the measurement time. .

Указанна цель достигаетс тбм, что в устройство введены сумматор, выход которого подключен к регистрирующему блоку, и дополнительные измерительные цепи, причем выход каждой измерительной цепи св зан с сумматором посредством нормализатора.This goal is achieved in tbm, that an adder, the output of which is connected to the recording unit, and additional measuring circuits are entered into the device, with the output of each measuring circuit connected to the adder via a normalizer.

На чертеже представлена блок-схема устройства.The drawing shows the block diagram of the device.

5 Устройство содержит регистрирующий блок 1 и цепь 2 измерени акустических колебаний рабочих колес 3, включаквдую последовательно соединенные микрофон 4, установленный на5 The device contains a recording unit 1 and a circuit 2 measuring acoustic oscillations of the impellers 3, including a serially connected microphone 4 mounted on

fO корпусе компрессора 5 и полосовой фильтр 6, сумматор 7, выход которого подключен к регистрирующему блоку 1, нормализатор 8, установленный в каждой измерительной цепи, и акустичес 5 кие волноводы 9.fO housing of the compressor 5 and the band-pass filter 6, the adder 7, the output of which is connected to the registering unit 1, the normalizer 8 installed in each measuring circuit, and acoustic waveguides 9.

Устройство работает следукхцим образом.The device works in the following way.

Микрофоны 4 установлены в плоркости вращени компрессора 5 в центрахMicrophones 4 are installed in the center of rotation of the compressor 5 in the centers

20 обследуекых групп из трех-четырех20 survey groups of three or four

Claims

impellers 3. Acoustical waveguides 9, made in the form of cones, the open end of which is tightly attached to the surface of the microphone, between the protective grille of each microphone and the housing of the grab “jakjpeftHeHH gras”. Such an arrangement of microphones and the conical structure of acoustic waveguides ensure reliable reception of acoustic signals generated by the compressor impellers in all groups with frequencies, propagating the rotor speed by the number of blades. The walls of the waveguides 9 are made of soundproof material,. which reduces the level of external noise that is emitted by other sources, such as a jet engine. The signals from microphones 4 are fed to band-pass filters 6. The bandwidths of the pass-through filters are selected depending on the speed of rotation of the rotor and the number of blades for each group of i-wheels 3. The filter signals go to the normalizers 8. Normalized by the root-mean-square value, the filtered signals go to adder 7, and the resultant (total.) signal from the adder output is fed to the recording unit 1. Thanks to the group arrangement of the microphones and the filtering of the PB signals to the corresponding groups of workers eliminated mutual effect of discrete components, which in turn allows is a linear summation with subsequent registration to produce them was Tsikh acoustic oscillations from all operating compressor wheels on a single channel. Thus, the presence in the device of the adder, the handler and additional measuring circuits improves the measurement accuracy. The use of the invention allows to improve the quality of diagnostics of a compressor of a gas turbine engine. Apparatus of the Invention A device for measuring discrete components of acoustic oscillations of a rotor of a compressor, comprising a recording unit and a circuit for measuring acoustic oscillations of impellers, including a series-connected microphone mounted on the compressor housing, and a band-pass filter, so that increase the accuracy and reduce the measurement time, the adder, the output of which is connected to the recording unit, and additional measuring circuits are entered into the device, with the output of each ritelnoy circuit coupled to summatrom by the normalizer. Sources of information taken into account in the examination 1. USSR author's certificate, cl. G 01 M 15/00, 1971.