SU917023A1

SU917023A1 - Device for measuring safety helmet absorbting parameters

Info

Publication number: SU917023A1
Application number: SU802915263A
Authority: SU
Inventors: Олег Игнатьевич Вылегжанин; Борис Леонидович Суворов
Original assignee: Всесоюзный научно-исследовательский институт охраны труда ВЦСПС в г.Свердловске
Priority date: 1980-04-17
Filing date: 1980-04-17
Publication date: 1982-03-30

Description

(54) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ ПАРАМЕТРОВ АМОРТИЗАЦИИ ЗАЩИТНЫХ КАСОК(54) DEVICE FOR MEASURING THE PARAMETERS OF AMORTIZATION OF PROTECTIVE CARDS

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Изобретение относитс к виброизмерительной технике, в частности к измерени м амортизационных свойств защитных касок при испытани х их на ударном стенде.The invention relates to a vibration measuring technique, in particular, to measuring the damping properties of protective helmets when tested on a shock bench.

Наиболее близким по технической сущности к изобретению вл етс устройство дл измерени параметров амортизации защитных касок, содержащее ударник, уста-, навливаемый под испытуемой моделью датчик силы, последовательно с ним соединенный усилитель, и регистратор 1.The closest to the technical essence of the invention is a device for measuring the parameters of the damping of protective helmets, containing a drummer, a force sensor inserted under the model under test, a power amplifier connected in series with it, and a recorder 1.

Недостатком указанного устройства вл етс ограниченный диапазон измерени , амплитуды импульса силы, что приводит к потере информации при испытани х новых конструкций касок.The disadvantage of this device is the limited measurement range, the amplitude of the impulse force, which leads to loss of information when testing new designs of helmets.

Цель изобретени - расщирение динамического диапазона измерений.The purpose of the invention is to expand the dynamic range of measurements.

Указанна цель достигаетс тем, что устройсто снабжено датчиком запуска, св зываемым с ударником, формирователем импульса , включенным между выходом датчика запуска и синхронизирующим входом регистратора , управл емым делителем, включенным между выходом усилител и входом регистратора, индикатором, подключенной к выходу усилител пороговой схемой , последовательно с ней соединенными логической схемой и триггером, подключенным одним выходом к второму входу управл емого делител , другим - к индикатору, и временной задержкой, включенной междуThis goal is achieved by the fact that the device is equipped with a trigger sensor associated with the drummer, a pulse shaper connected between the trigger sensor output and the recorder's synchronization input controlled by a divider connected between the amplifier output and the recorder input, an indicator connected to the amplifier output with a threshold circuit, sequentially connected to it by a logic circuit and a trigger connected by one output to the second input of the controlled divider, the other to the indicator, and a time delay is enabled Noah between

5 выходом датчика запуска и вторым входом логической схемы.5 output trigger sensor and the second input logic circuit.

На чертеже изображена блок-схема устройства .The drawing shows a block diagram of the device.

Устройство дл измерени параметровDevice for measuring parameters

JQ амортизации защитных касок содержит устанавливаемый под испытуемой моделью 1 и ударником 2 датчик 3 силы, последовательно с ним соединенный усилитель 4, регистратор 5, датчик 6 запуска, св зываемый с ударником 2, формирователь 7 импульса,JQ of the protective helmet depreciation contains a force sensor 3 installed under the tested model 1 and a drummer 2, a connected amplifier 4 in series with it, a recorder 5, a start sensor 6 connected to the drummer 2, a pulse shaper 7,

15 включенный между выходом датчика 6 запуска и синхронизирующим входом регистратора 5, управл емый делитель 8, включенный между выходом усилител 4 и входом регистратора 5, индикатор 9, подключенную к выходу усилител 4 пороговую схему 10, 15 connected between the output of the start sensor 6 and the synchronization input of the recorder 5, a controlled divider 8 connected between the output of the amplifier 4 and the input of the recorder 5, an indicator 9 connected to the output of the amplifier 4, threshold circuit 10,

Claims

20 connected in series with it is a logic circuit 11 and a trigger 12, connected by one output to the second input of the controlled divider 8, the other indicator 9, and a time delay 13 connected between the output of the start sensor 6 and the second input of the logic I. The device operates as follows in a way. In the initial position, the trigger 12 is in the "zero" state, the division ratio of the controlled divider voltage 8 is equal to one. The state of the trigger 12 is indicated by the indicator 9. The recorder 5, which uses a memory oscilloscope, is calibrated so that the maximum range of the image of the signal on the screen corresponds to the amplitude of the force pulse transmitted through the test model 1 (protective helmet) to the force sensor 3, for example, 500 kgf. When tested, the impactor 2 falls on the test model 1. At the moment of the impact of the test model on the impact device, the launch sensor 6 is operated. The pulse shaper 7 generates a signal that triggers the sweep of recorder 5. This same signal, after a 10 ms delay by a time delay 13, arrives at the pulse input of logic circuit 11. Force sensor 3 produces a signal that, after amplification in amplifier 4, is fed to control input If the tested model 1 has good damping properties, immediately after the drummer touches the body of the tested model 1, she will start to resist of impact, the body movement of the test pattern 1 together with the hammer 2 is small, the output power sensor 3 reaches the level corresponding 100kgs, less than 10 ms. During the same time, the threshold circuit 10 triggers and outputs a voltage inhibiting the potential input of logic circuit 11. Therefore, the signal of the pulse shaper 7 will not pass to trigger trigger 12, since, acting through a time delay 13 on the pulse input of the logic circuit 11, it will hit only after 10 ms. Trigger 12 will remain in the zero state and the signal from amplifier 4 will pass through controlled divider 8 to recorder 5 without changes. If Model 1 with unsatisfactory damping properties came in for testing, then when the drummer touches its case 2, it will move together for a while with a drummer with almost no resistance. The resistance of the tested model G to impact is sharply reduced, and the process is delayed with respect to the moment of contact. The nature of the signal at the output of the sensor, 3 strengths will change accordingly: the signal will have a large amplitude and will arrive with a delay exceeding 10 ms. The threshold circuit does not have time to work and the signal from the pulse shaper 7 will pass through the logic circuit 11 and transfer the trigger 12 to a single state. As a result, the division ratio of the controlled voltage divider 8 will become 10, as indicated by the display device 9, the signal from amplifier 4 will pass to the recorder 5 10 times weakened and the signal image will not exceed the geometric dimensions of the screen. The use of the proposed device allows, without distortion, to register signals from a force sensor in a wide dynamic range and promptly reject the tested models (protective helmets) with an unsatisfactory level of depreciation. Apparatus of the invention for measuring the damping parameters of protective helmets, comprising a drummer, a force sensor mounted below the model under test, an amplifier connected in series with it, and a recorder, characterized in that, in order to broaden the dynamic measuring range, it is equipped with a trigger sensor associated with the drummer. a pulse shaper connected between the output of the start sensor and the synchronizing input of the recorder, controlled by a divider connected between the amplifier output and the recorder input, an indicator connected to the amplifier output by a threshold circuit, connected in series with a logic circuit and a trigger connected by one output to the second input of the controlled divider, the other to the indicator, and a time delay connected between the output of the start sensor and the second input of the logic circuit. Sources of information taken into account in the examination 1. Peter - Paul Heusinger «Bin Fallpeufverfahren fur Jndustiecschutzhelme, Gluckauf, 1963, Bd 99, No. 4, 192-197 (prototype).

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