SU813026A1

SU813026A1 - Oscillation suppressing method

Info

Publication number: SU813026A1
Application number: SU782698957A
Authority: SU
Inventors: Леонид Иосифович Слепян; Владислав Борисович Васильков
Original assignee: Войсковая часть 70170
Priority date: 1978-12-18
Filing date: 1978-12-18
Publication date: 1981-03-15

Description

1one

Изобретение относитс к общему машиностроению, в частности к способам гашени колебаний, и предназначено дл использовани при физическом моделировании на малоразмерных модел х, например, высокоскоростного движени тел в плотной среде, а также при конструировании технических объектов, например машин, приборов, устройств, систем, испытывёоощих управл емое ударное воздействие .The invention relates to general engineering, in particular to methods for damping oscillations, and is intended for use in physical modeling on small-sized models, for example, high-speed body motion in a dense medium, as well as in the design of technical objects, such as machines, devices, devices, systems, test driven impact.

Известен способ виброизол ции стержн или пластины, в котором на их поверхности по направлению распространени волны размещают массиные элементы 1.There is a known method of vibration isolation of a rod or plate, in which mass elements 1 are placed on their surface along the direction of wave propagation.

Наиболее близким к предложенному по технической сущности и достигаемому результату вл етс способ гашени колебаний, в котором к колеблющемус объекту прикладывают силу, направление которой противоположно силе, вызывающей колебани .12.The closest to the proposed technical essence and the achieved result is a method of damping oscillations, in which a force is applied to the oscillating object, the direction of which is opposite to the force causing oscillations.

Недостатком данных способов влетс то, что они позвол ют устранить колебани только при периодических нагрузках, но не решают задачу гашени колебаний при ударных воздействи х.The disadvantage of these methods is that they allow to eliminate oscillations only under periodic loads, but do not solve the problem of damping oscillations under shock effects.

Цель изобретени - гашение колебаний объектов при ударе.The purpose of the invention is to suppress vibrations of objects upon impact.

Указанна цель достигаетс тем, что силу, создающую колебани при ударе, линейно измен ют до заданного значени в течение времени, кратного периоду основного тона колебаний .This goal is achieved by the fact that the force that creates oscillations upon impact linearly changes to a predetermined value during a time multiple of the period of the fundamental tone of the oscillations.

На фиг.1 показана зависимость силы от времени; на фиг.2 - зависимость напр жени от времени.Figure 1 shows the dependence of force on time; Fig. 2 shows the dependence of voltage on time.

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Способ реализуетс следующим образом .The method is implemented as follows.

К торцу объекта (стержн ) в продольном направлении прикладывают силу, при этом ее значение линейно 20 измен ют до заданного значени вA force is applied to the end of the object (rod) in the longitudinal direction, and its value is linearly changed to a predetermined value in

течение времени, кратного периоду основного тока колебаний.the passage of time, a multiple of the period of the main current oscillations.

Дл определени напр жени б в 25 поперечном сечении при приложеНИИ силы Q по формуле 6 - E :необходимо решить волновое уравнение видаTo determine the voltage b in cross-section 25 when a force Q is applied by the formula 6 - E: it is necessary to solve the wave equation of the form

пP

Claims

3 t with the following boundary values for x, (, n - and Ex EF (); - n 5x °, -1.0 where U is the displacement; X is the longitudinal coordinate; c is the velocity of propagation of disturbances in the rod; t is the time;, 6 - stress; Е - modulus of elasticity of the material t rod length; P - rod cross-sectional area; O. — force. t) - (t - §) -H (t -), where H is the Heaviside function: H (t) l at H (t) 0 at. This shows that the voltage in the cross section of the rod is pulsating from O to Q / F with period. Here is the period the fundamental tone of oscillations is a multiple of the period of all higher tones. in cross section, the bar grows to a value of -19S., and then doesn’t run out of it. PTC The presented graphs show the results of calculations obtained for a bar cross section with a coordinate. (the origin of coordinates coincides with the rod end). Figure 1 depicts the axis of the hordes. The deposited force, on the abscissa - dimensionless time t, curves 1 denote the function G | (tГ a sudden impact on the rod, and curve 2 - the function Q (t); time E. When a force is suddenly applied to the rod, as can be seen from the graph (curve 3), the stress periodically changes in the cross section under consideration. period of the fundamental tone of the oscillations), the voltage increases (curve 4), and then remains the maximum value of it is reduced by half. 7 the same effect is achieved for the cross section of the rod with any other coordinate x and the time period of growth of force fi multiple of the fundamental tone period of oscillations. , the ratio of dc stresses implemented with the proposed method to the maximum stresses that occur when a sudden application of force decreases. The proposed method of damping vibrations of objects, maintaining the impact with shock, forms constant elements in the elements of the object with respect to time, with this numerical value of the voltages decreasing. Claims of the method of damping oscillations, concluded that a force is applied to an oscillating object, the direction of which is opposite to the force causing oscillations, characterized in to a predetermined value for a time multiple of the period of the fundamental tone of the oscillations. Sources of information taken into account in the examination 1, USSR Copyright Certificate 44050, CL. F 16 F 15/00, 1973.

2.Avtors.ko certificate of the USSR No. 533774, CL. F 16 F 15/00, 1974 (Prototype).