SU1270603A1

SU1270603A1 - Vibration testing installation

Info

Publication number: SU1270603A1
Application number: SU843872470A
Authority: SU
Inventors: Анатолий Владимирович Красников; Николай Михайлович Литвинчук; Владислав Борисович Назаренков; Сергей Антонович Сирота; Владимир Николаевич Тараненко
Original assignee: Специальное Конструкторско-Технологическое Бюро Института Технической Механики Ан Усср
Priority date: 1984-12-25
Filing date: 1984-12-25
Publication date: 1986-11-15

Abstract

Изобретение относитс к испытательной технике и может найти применение при испытани х динамически сложных объектов. Цель изобретени расширение функциональных возможностей виброиспытательной установки за счет вы влени резонирунщих элементов испытуемого объекта и определени положени его центра приведенных масс. Дл этого в виброиспытательной установке с электродинамическим виб- ровозбудителем 3, магнитна система которого содержит две пары полюсовThe invention relates to a test technique and may find application in the testing of dynamically complex objects. The purpose of the invention is the extension of the functional capabilities of the vibration test facility by detecting the resonating elements of the test object and determining the position of its center of the reduced masses. For this purpose, in a vibration test facility with an electrodynamic vibration exciter 3, the magnetic system of which contains two pairs of poles

Description

5, 7 и 6, 8 с катушками 9, 11 и 10, 12 подмагкичивани , питаемых от ав тономны.х источников 14, 16 и 15, 17 соответственно, производитс сравнение токов диаметрально расположенmix катушек ка сдой пары. Сиг налы „ пропорциональные разности токов,-с выходов блоков 28 и- 29 вычитани нормализуютс по уровню и подаютс на5, 7 and 6, 8 with coils 9, 11 and 10, 12 podmakivichivani, fed from autonomous sources 14, 16 and 15, 17, respectively, compares the currents diametrically located imix coil with each pair. Signals "proportional to the difference of currents," from the outputs of blocks 28 and 29 of the subtraction are normalized by the level and fed to

входы двухкоординатного регистратора 33, По записанной последним диаграмме определ ют исходное смещение центра масс объекта 19 и положение его приведенного центра масс при возниконовении резонансов элементов объекта в процессе сканировани частоты возбудденн . 2 ил.the inputs of the two-coordinate recorder 33. The initial offset of the center of mass of the object 19 and the position of its reduced center of mass at the occurrence of resonances of the elements of the object during the frequency scanning excitation are determined from the last recorded diagram. 2 Il.

1one

Изобретение относитс к испытательной технике, а именно к вибронспьп ательньш установкам, и может найти Применение при испытани х динамически сложных объектов,The invention relates to testing equipment, namely to vibro-vibrating plants, and can be used in testing of dynamically complex objects,

Цель изобретени - расширение функциональных возможностей вибропспытательной установки за счет вы влени резонируницих элементов испытуемого объекта и определени положени его центра приведенных масс.The purpose of the invention is to expand the functional capabilities of the vibration test facility by detecting the resonating elements of the test object and determining the position of its center of the reduced masses.

На фиг, 1 изображена принщ пиальна схема предлагаемой виброиспыта;тельной установки на фиг, 2 - при- , мер диаграммы, регистрируемой на но .снтёлезаписи двухкоординатного регистратора .Fig. 1 shows a diagram of the proposed vibration test; it is mounted in Fig. 2, an example of a chart recorded on a recording of a two-coordinate recorder.

Виброиспытательна установка со-, дерзигг задакщий генератор 1 сканирую щего гармонического сигнала, к котоpobiy через усилитель 2 мощности подключен электродинамический вр1бровозбудитель 3; магнитна система которого включает керн 4 и две пары полюсов 5 -8 с катушками 9-12 подмагничквани 3 равномерно расположен 1ых по О1ФУЖНОСТИ вокруг подвижной катушки 13 вибровозбудител . Катушки 9-12 подмагничивани имеют аззтоиомные упраЕл е&5ые источники 14 - 17 питани . На столе 18 вибровозбудителл 3, жестко св занном с подвижной катушкой 13, устанавливаетс испытуемый объект 19ф Дл контрол паразитных угловьЕ колебаний стола 18 с объектом 19 и их компенсации установка снабжена парами виброизмерительных преобразователей 20 - 23, симметрично расположенных на столе 18 идентич ю полюсам 5 В, и двум блоками 24 и 25 сравнени , к входамThe vibro-test installation of a co-oscillator, a back-up oscillator 1 of a scanning harmonic signal, to which electrodynamic surge exciter 3 is connected through an amplifier 2 of power; The magnetic system of which includes a core 4 and two pairs of poles 5-8 with coils 9-12 of the magnet 3 are evenly located first in O1FUSE around the moving coil 13 of the vibration exciter. The coils 9–12 bias have azo-ohmic controls E & 5 sources 14-17 supply. On the table 18 of vibration exciters 3, rigidly connected with the moving coil 13, the test object 19f is installed. To control the parasitic angles of the table 18 oscillations with the object 19 and their compensation, the installation is equipped with pairs of vibration measuring transducers 20-23, symmetrically located on the table 18 identical to 5 V poles , and two blocks 24 and 25 comparison, to the inputs

22

которых подключены пары диаметрально расположенных виброизмерителькых преобразователей 20 и 22, 21 и 23 соответственно , а. к выходам - управл сщие входы источников 14 и 16, 15 иwhich are connected to a pair of diametrically located vibration measuring transducers 20 and 22, 21 and 23, respectively, and. to the outputs - control inputs of sources 14 and 16, 15 and

17 питани . Блок 24 (25) сравнени имеет на входах детекторы 26, к выходам которых подключень; входы блока 27 вычитани . Дл вы Елени peaoiiHрующих злементов испытуемого объекта 19 и определени положени его центра приведенньтх масс в установку введены два блока 28 и 29 вычитани , подключенных входам - к парам диаметрально расположенных катупек 9 и 11j 10 и 12 подмагничива)ш , два нормализатора 30 и 31, сигнальиьй вход, калдаого из которьк подключен к вьходу соответствуюга,его блока 28 и 2917 food. The comparison unit 24 (25) has detectors 26 at the inputs, the outputs of which are connected; inputs of block 27 subtract. For you, Eleni looking at the elements of the test object 19 and determining the position of its center of the reduced masses, two units 28 and 29 of the subtraction are introduced into the installation; the connected inputs are connected to pairs of diametrically located catuptec 9 and 11j 10 and 12 bias), two normalizers 30 and 31, the signal input, which is connected to the input of the corresponding block 28 and 29

вычитани , детектор 32, через который выход задзюще1о генератора 1 соединен с управл :юац1ми входаг-и нормализаторов 30 и 31, и двухкоординатньн : регистратор 33 (например, в виде самописца), подключенный к ЕЬКОдам нормализаторов 30 и 31subtraction, the detector 32, through which the output of the generator 1 is connected to the control: normal input 30 and 31, and two-coordinate: the recorder 33 (for example, in the form of a recorder), connected to the EQodes of normalizers 30 and 31

Установка работает слрдугсшим образомThe installation works as follows

Синусоидальньгй сигнал нлавно мен ющейс частоты ге ;ератора 1, усиленный ycилитeлe s 2 ко.щностИз подаетс на подвшкную катуилсу 13 электродинамического вибровозбудител 3,A sinusoidal signal of the oscillating frequency of the generator; 1, amplified by the amplifier s 2 capacity. From the power supply is supplied to the pilot catholes 13 of the electrodynamic vibration exciter 3,

Прн этом в катушси 9-12 noAMar tH4iiвани подаетс одинаковый ток от источников 14-17 питани , flpj-i отсутствии эксцентриситета нагрузки толкаю-шд сила лежит на вертикальной осиIn this, in the 9-12 no AMar tH4ii katusi, the same current is supplied from the power supply sources 14-17, flpj-i no load eccentricity, the push force is on the vertical axis

Claims

vibration exciter 3, When mounted on the table 18 of the test object 19 with 3 center of mass, displaced relative to the vertical axis of the vibration exciter 3, a disturbing moment (s) relative to the X and Y axes occurs. The different points of the table 18 with equal currents in coils 9-12 magnetizing different amplitudes of oscillations; table 18 with object 19 makes additional (parasitic) angular oscillations. The signals taken from diametrically located vibration measuring transducers 20, 22 and (or) 21, 23 have different values. In blocks 24 and 25 of the comparison, these signals are detected and their difference is determined. The mismatch signals are respectively fed to the controlled power supply sources 14 to 17, and the bias currents in the coils 9-12 are changed in such a way as to compensate for the effect of the disturbing moments M.,; Mu. The achievement of full compensation corresponds to the equality of signals of diametrically located converters. Leu 20 and 22 (21 and 23), Signals proportional to currents in diametrically located coils 9–12 sub-magnetizations, are subtracted in blocks 28 and 29, normalized by the level of excitation and fed to a two-coordinate recorder 33. from point O (Fig. 2) by an amount proportional to the displacement of the center of mass of the object 19 relative to the axis of the vibration exciter 3, in the direction of this light (point A, fig 2) If the object 19 is asymmetrically located relative to the axis of excitation, the resonating elements At the time when the frequency of the exciting oscillations coincides with the proper1, 1Ф1 frequencies of these elements (nodes), side oscillations of the object 19 occur. This leads to a violation of the equality of signals taken from the converters 20, 22 and (shi) 21, 23, which leads to changing the bias currents in the corresponding coils 9, 11 and (or) 10, 12, the Perot of the two-coordinate recorder 33 moves in the direction of the element (node) plane of the object 19 that caused the side oscillations, and the amount of movement of the proprietary energy intensity is resonant th element (node). When the resonance region of the resonating element (node) passes through the pen, the pen of the two-coordinate recorder 33 returns to the point 1 A (see Fig. 2). . Thus, in the diagram (Fig. 2), the amount of movement of the feather from point O to point A is proportional to the displacement of the center of mass of the object 19 relative to the axis of the vibration exciter 3, and the angle Cf determines the direction of displacement. The deviation of the pen of the two-coordinate recorder 33 from point A indicates the presence in the design of resonating elements (nodes), caused 1x at its partial frequencies f,, f, f side oscillations. The planes of the location of these elements (nodes) and their energy intensity can be determined from the angles, /, y and displacements A,, Aj, respectively. The determination of these parameters is necessary to assess the dynamic properties of objects, to make optimal decisions to eliminate side oscillations, which lead to a decrease in the loading of structures, deterioration of the functioning conditions and often are causes. damage or failure. In addition, the determination of the resonating elements (nodes) is also necessary to predict their strength and reliability. The invention will be particularly effective in testing objects whose design eliminates the possibility of installing vibration measuring transducers directly on the elements (nodes) of an object. Vibration testing apparatus containing a driver of an electromotive exciter, the magnetic system includes a core and two pairs of poles with an arc wrench , evenly distributed around the moving coil of the vibration exciter, autonomous controlled sources of power bias coils, two pairs of vibration measuring transducers, arranged symmetrically on the table vibroexciters identical poles of the magnetic system, comparing the two blocks to the inputs of each of which is connected a pair of diametrically disposed

S12

the vibrois measures the formers, and, by the way, controls,), the inputs of the pitadash sources correspond to catu--. Nekiivichivapi 3 about tl i-i h a root a c te mE that, in order to expand the functionality due to the introduction of the resonating elements of the test object and determine the position of its center centerline masses5 it is equipped, with two units of reading, each of which will BE 7060J "

whose inputs to one of the arrays of diametrically located magnetisation coils, two normalizers, the signal input of each of which is connected to the output of the corresponding subtraction unit, a detector, through which the output of the master oscillator is connected to the control inputs of the normalizers, and a dual register of the normalizer; .