SU988359A1

SU988359A1 - Oscillation exciter

Info

Publication number: SU988359A1
Application number: SU813314777A
Authority: SU
Inventors: Александр Иванович Ермаков; Александр Юрьевич Березкин; Игорь Вячеславович Терехин; Владимир Александрович Антипов
Original assignee: Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Акад.С.П.Королева
Priority date: 1981-07-13
Filing date: 1981-07-13
Publication date: 1983-01-15

Description

(54) ВОЗБУДИТЕЛЬ КОЛЕБАНИЙ(54) VIBRATION AGER

Изобретение относитс к возбужде ни м колебаний в телах, обладающих поворотной симметрией и может быть использовано дл возбуждени колебаний лопаточных венцов турбомашин.The invention relates to the initiation of oscillations in bodies with rotational symmetry and can be used to excite oscillations of the blades of turbomachines.

Известен стенд дл испытани ротора турбомашин на вибрацию, содержащий вращгиощййс с заданным числом оборотов исследуе1Фай ротор и вращающуюс с заданным числом оборотов емкость с сопловыми отверсти ми дл подвода к ротору сжатого газа. В данном стенде частота возбуждени зависит от числа сопловых отверстий емкости, а также от соотнс ени числа оборотов исследуемого ротора и емкости с сопловыми отверсти миtl3.A stand for testing a rotor of turbomachines is known for vibration, containing a rotating rotor with a given speed of exploration, a research rotor and a container rotating with a given speed of rotation with nozzle openings for supplying a compressed gas to the rotor. In this stand, the frequency of excitation depends on the number of nozzle openings of the tank, as well as on the ratio of the revolutions of the rotor under study and the tank with the nozzle openings mtl3.

Недостатки данного стенда состо т в том, что необходим привод большой мощности и сложно организовать подвод газа по полому валу к емкости с сопловыми отверсти ми.The drawbacks of this stand are that it requires a high power drive and it is difficult to arrange gas supply along a hollow shaft to a tank with nozzle openings.

Наиболее близким по технической сущности и достигаемому эффекту к .предлагаемому вл етс возбудитёль колебаний, содержащий источник сжаторо воздуха, выполненный в виде сопда , приводной вал и жестко закрепленный на его торце диск дл модул ции.The closest in technical essence and the achieved effect to the proposed one is an oscillation exciter containing a source of air squeezer, made in the form of a sotz, drive shaft and a modulation disk fixed on its end face.

направл емой на испытуемую деталь струи сжатого воздуха С2 .compressed air jet C2 directed to the tested part.

Однако данный стенд позвол ет испытывать на вибрацию отдельные детали и не создает возбуждени , которые требуютс дл лопаточных венцов с целью приближени условий возбуждени к натурным.. J Цель изобретени - расширение диа10 пазона возбуждени колебаний.However, this stand allows vibration testing of individual parts and does not create the excitations that are required for the blade crowns in order to bring the excitation conditions to real ones. J The purpose of the invention is to expand the range of excitation of vibrations.

Эта цель достигаетс тем, что в возбудителе колебаний, содержащем источник сжатого воздуха, приводной вал и жестко закрепленный йа его тор15 це диск дл модул ции направл емой на испытываемую деталь струи сжатого воздуха, источник сжатого воздуха выполнен в виде цилиндрической емкости , установленной соосно с приводнымThis goal is achieved by the fact that in the exciter of oscillations containing a source of compressed air, a drive shaft and a rigidly fixed upper end15 of the disk to modulate the jet of compressed air directed to the test piece, the source of compressed air is made in the form of a cylindrical tank installed coaxially with the driven

20 валом, с сопловыми отверсти ми, равномерно размещенными по окружности заданного радиуса на ее торце, обращенном в сторону диска, при этом на диске по окружности того же ра25 диуса выполнено не менее двух радиальных окон, расположенных углом сдвига20 shaft, with nozzle holes, evenly placed around the circumference of a given radius on its end facing the disk, while on the disk circumferentially of the same radius, at least two radial windows arranged with a shear angle are made

Claims

30 where m is the number of windows in the modulating disk; - the sequence number of the window by the disk circumference (f .-. mf}, and the number of nozzle holes is equal to the number of windows. Figure 1 shows the pathogen longitudinal to the counter; Fig. 2 is the same, front view. The oscillation pathogen also contains a point compressed air, made in the form of a cylindrical tank 1 installed coaxially with the drive shaft 2, nozzle holes 3 placed around the circumference of a given radius on the end face of the tank 1 facing the disc 4, on the disc 4 circumferentially the same radius 5, located with a shear angle. Pathogen p It works as follows: The rotating object of research 6 is affected by modulated jets of compressed gas flowing out of the tank 1 through nozzle openings, the discharge of gas jets is produced by a disk 4. A running wave of loads with a frequency of excitation f is generated in the research object b, which is calculated from formula () m where n is the number of revolutions of the object, Hz; P is the number of revolutions of the modulating disk, Hz; m is the number of holes in the modulating disk. The proposed production of fishing waves allows you to expand the range of excitation of vibrations and create a traveling excitation wave. Claims of oscillation exciter comprising a source of compressed air, a drive shaft and a disk rigidly attached to its end for modulating a jet of compressed air directed at the test piece, characterized in that, in order to expand the range of excitation of oscillations, the source of compressed air is made in the form of a cylindrical containers mounted coaxially with the drive shaft, with nozzle openings evenly placed around the circumference of a given radius. at its end facing the disk, at the same time at least two radial windows with a shear angle are made on the disk of the same radius of the disk. where m is the number of windows in the disk; ; P is the serial number of the window around the disk circumference (t ... pa-O and the number of nozzle holes is equal to the number of windows. Sources of information taken into account during the examination 1. Author's certificate of the USSR, 357490.% class G 01 M 15 / 00; 1972.

2. Authors certificate of the USSR 335565, cl. G 01 M 7/00, 1972, (prototype).

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