RU2008133110A

RU2008133110A - TEST METHOD FOR SHOCK IMPACTS

Info

Publication number: RU2008133110A
Application number: RU2008133110/28A
Authority: RU
Inventors: Александр Сергеевич Орлов (RU); Александр Сергеевич Орлов; Сергей Александрович Орлов (RU); Сергей Александрович Орлов
Original assignee: Открытое Акционерное Общество "Информационные Спутниковые Системы" Имени Академика М.Ф. Решетнева" (Ru); Открытое акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнева"
Priority date: 2008-08-11
Filing date: 2008-08-11
Publication date: 2010-02-20
Also published as: RU2386939C1

Abstract

Способ испытаний на ударные воздействия заключающийся в нагружении объекта испытаний пиротехническим устройством, определении ускорений, деформаций в волноводе специализированного ударного стенда, получении импульса силы пиротехнического устройства, а также амплитудных и ударных спектров ускорений в точке приложения ударного воздействия отличающийся тем, что ударное воздействие осуществляют с помощью не разделяемого пиротехнического устройства с регулируемыми параметрами удара, содержащего подвижный элемент с бойком, причем предварительно для используемого пиротехнического устройства определяют необходимый вид импульса, после чего выбирают тип и форму бойка, и скорость соударения бойка с объектом испытаний, далее определяют необходимое давление в пиротехническом устройстве и необходимую энергию пиропатронов, создающих давление в свободной полости пироустройства, затем выбирают тип пиропатронов, их количество и размер свободной полости внутри пиротехнического устройства после чего формируют последовательность срабатывания пиропатронов, далее на специализированном ударном стенде проводят срабатывание выбранного пиротехнического устройства, получают импульс силы, импульс ускорений, а также амплитудные и ударные спектры, сравнивают с требуемыми значениями по формуле: ! Lm<=>Arg min Δ, и ! ! где: Lm - "m" комбинация параметров пиротехнического устройства, при которой величина Δ минимальна; ! Δ - погрешность создания ударного воздействия;; ! "ω" - круговая частота; ! J - количество испытаний; ! "j" - номер испытаний; ! Т - количество точек отсчета по времени; ! Н - количество частотных диапазонов; ! "η" - номер частоThe method of impact tests consists in loading the test object with a pyrotechnic device, determining accelerations, deformations in the waveguide of a specialized impact stand, obtaining a force pulse of the pyrotechnic device, as well as amplitude and shock acceleration spectra at the point of impact application, characterized in that the impact is carried out using not shared pyrotechnic device with adjustable parameters of the impact, containing a movable element with a striker, moreover, for the pyrotechnic device used, determine the necessary type of impulse, then select the type and shape of the striker, and the speed of impact of the striker with the test object, then determine the necessary pressure in the pyrotechnic device and the necessary energy of the squibs creating pressure in the free cavity of the pyrodevice, then select the type of squibs, their number and the size of the free cavity inside the pyrotechnic device, after which they form the sequence of operation of the squibs, then to the specialist the selected shock stand, the selected pyrotechnic device is triggered, a force impulse, acceleration impulse, as well as amplitude and shock spectra are obtained, compared with the required values by the formula:! Lm <=> Arg min Δ, and! ! where: Lm - "m" is a combination of parameters of the pyrotechnic device at which Δ is minimal; ! Δ is the error in creating the impact ;; ! "ω" is the circular frequency; ! J is the number of tests; ! "j" is the number of tests; ! T is the number of reference points in time; ! H is the number of frequency ranges; ! "η" - number often

Claims

The method of impact tests consists in loading the test object with a pyrotechnic device, determining accelerations, deformations in the waveguide of a specialized impact stand, obtaining a force pulse of the pyrotechnic device, as well as amplitude and shock acceleration spectra at the point of impact application, characterized in that the impact is carried out using not shared pyrotechnic device with adjustable parameters of the impact, containing a movable element with a striker, moreover, for the pyrotechnic device used, determine the necessary type of impulse, then select the type and shape of the striker, and the speed of impact of the striker with the test object, then determine the necessary pressure in the pyrotechnic device and the necessary energy of the squibs creating pressure in the free cavity of the pyrodevice, then select the type of squibs, their number and the size of the free cavity inside the pyrotechnic device, after which they form the sequence of operation of the squibs, then to the specialist the selected shock stand, the selected pyrotechnic device is triggered, a force impulse, acceleration impulse, as well as amplitude and shock spectra are obtained, compared with the required values by the formula:

L _m <=> Arg min Δ, and

where: L _m - "m" is a combination of parameters of the pyrotechnic device at which Δ is minimal;

Δ is the error in creating the impact ;;

"ω" is the circular frequency;

J is the number of tests;

"j" is the number of tests;

T is the number of reference points in time;

H is the number of frequency ranges;

"η" is the number of frequency ranges;

And _j (ώ _η ) are the experimental values of the amplitude spectrum in the "η" frequency range during the "J" test at the control point;

Г _j (ώ _η ) - normalized values of the amplitude spectrum in the "η" frequency range during the "J" test at the control point;

║A║ is the norm in the amplitude spectrum;

Ξ _jη is the weight coefficient in the amplitude spectrum;

S _j (ώ _η ) - experimental values of the shock spectrum of accelerations in the "η" frequency range during the "J" test at the control point;

(ώ _η ) - normalized values of the shock spectrum of accelerations in the "η" frequency range during the "J" test at the control point;

║S║ is the norm in the shock spectrum of accelerations;

Ω _jη is the weight coefficient for the shock spectrum of accelerations.

I _jk (t _n ) - experimental values of the acceleration momentum in the "n" time range during the "J" test at the control point;

Ĩ _j (t _n ) - normalized values of the acceleration momentum in the "n" time range during the "J" test at the control point;

║I║ is the norm on the acceleration momentum;

Θ _jn is the weight coefficient of the acceleration momentum.

and if the difference is greater than the maximum permissible error, the parameters of the pyrotechnic device are adjusted according to the above algorithm to ensure the required error, after which the shock pyrotechnic device is subjected to shock loading of the test object.