SU494622A1 - Device for determining vibration parameters of turbomachine blades - Google Patents

Description

(54) DEVICE FOR DETERMINING PARAMETERS

VIBRATION BLADE TURBOMASHIN 12,

mi, the speed (frequency) of the shaft rotation and

Parameprami vibration lolatok can be

 Writing with | P01.power, compiled 59 fi 0: C1New equation move about the center of the blade

Li RQti + A Sin (u / + pho) - 51pfo,

where Li is | pa.sto 1eh: between two impulses, MI | Sensor, mi, I31merbn;

R - | radius of a circle, described by the ends of | Lopatka;

Q is the circular frequency of the rotation of ipOTOipa;

ti is the distance between the time for which the end of the blade research passes the distance to the sensor D1vum;

A - ashlitude of oscillations of the bed;

0) - circular frequency of oscillation of the lap with respect to the average position;

the ph - phase angle characterizing the deviation of the blade from the average position IB of the instant of passage of the first sensor MI1MO.

In addition to the two previously known values (Lj, R), this uranium includes three unknowns characterizing the cholebe and blades (A, co, fo), and two greats (Q and ti) that can be measured and known, m method. m Since to determine all three unknown quantities, it is necessary to have a system of three independent equations, to obtain them four sensors should be installed, shifted one relative to the other in the direction of rotation of the rotor | Ia, some predetermined distances. The operation of the device consists in solving the system of three independent equations of the indicated type using a specialized | va | n | noi or universal computing system that both detects the definition of blade vibration parameters (A, ω and pho) with the required degree of accuracy at any frequency rotation of the rotor in both established and in (transient modes of operation of the turbo. TYPES. Measurement in transient modes is possible because the determination required for solving the system of data equations (ti) is produced in AMD,. the time of one revolution of the rotor. iB. limits this (the time the frequency of the rotation of the rotor can be counted (constant.

Subject invention

A device for determining the vibration parameters of TurboMash blades, containing pulse sensors for the passage of blades, mounted on the body of a turbomachine, a rotor position sensor of a turbomachine, and a device for forming signals and signals from sensors on an indicator different from that in order to measure several vibratory parameters. , including in transient modes, and the range of the frequency range, before it is added. Additional. . sensor, and the total number of ulon sensors it has by one is greater than the number of E31 measures of its parameters; the angular distance between the pulse sensors is less than 180 °; In this case, the device 1 is used to develop signals in a field of information in the form of a time meter and output tests and a block of the solution of the trigon meter system of the classical equations with the number of unknowns equal to the number of measured parameters.