SU742799A1

SU742799A1 - Piezoelectric accelerometer

Info

Publication number: SU742799A1
Application number: SU772441194A
Authority: SU
Inventors: Виктор Павлович Дунаевский; Анатолий Николаевич Вуколов; Михаил Иванович Субботин
Original assignee: Предприятие П/Я А-3759
Priority date: 1977-01-06
Filing date: 1977-01-06
Publication date: 1980-06-25

Description

Изобретение относится к измерительной технике.The invention relates to measuring equipment.

Известны пьезоэлектрические акселерометры, содержащие основание, инерционную массу и чувствительный элемент, между которыми введёны прослойки из пластичного материала [1] , [2].Piezoelectric accelerometers are known that contain a base, an inertial mass, and a sensing element, between which interlayers of plastic material are introduced [1], [2].

Недостатком таких акселерометров является ограничение диапазона измерений в связи с тем, что собственная частота акселерометров снижается из-за сравнительно большой толщины прослойки , уменьшающей ее жесткость.The disadvantage of such accelerometers is the limitation of the measurement range due to the fact that the natural frequency of the accelerometers is reduced due to the relatively large thickness of the layer, reducing its rigidity.

' Цель изобретения - расширение диапазона измерений.'The purpose of the invention is the expansion of the range of measurements.

Для этого в предлагаемый акселерометр между контактирующими поверхностями основания, чувствительного элемента и инерционной массы введены прокладки, выполненные из твердого гомогенного, металлического раствора, заполняющего на высоте микро,неровностей контактирующие поверхнос¹ ти.For this purpose, gaskets made of a solid homogeneous, metal solution filling at the height of micro irregularities contacting surfaces of ¹ ty are introduced into the proposed accelerometer between the contacting surfaces of the base, the sensitive element and the inertial mass.

На чертеже изображен предлагаемый пьезоэлектрический акселерометр.The drawing shows the proposed piezoelectric accelerometer.

На основании акселерометра 1 установлены пъезоэлемент 2 и груз (инерционная масса) 3, которые поджа· ты к основанию и друг к другу пружиной 4 так, что выступы микронеровнос· . тей соседних поверхностей контакти’ руют между собой. Промежутки между выступами заполнены гомогенным твердым, металлическим раствором 5. Жесткость соединения любой пары деталей определяется параллельным θ соединением контактной жесткости выступов и жесткости твердого раствора между ними. Ввиду малой толщины слоя раствора и одновременно большого модуля упругости, свойственного 5 металлам, эта жесткость велика. Поэтому собственная частота акселерометра оказывается высокой.On the basis of the accelerometer 1, a piezoelectric element 2 and a load (inertial mass) 3 are installed, which are pressed to the base and to each other by a spring 4 so that the protrusions are microrough. Their adjacent contact surfaces are interconnected. The gaps between the protrusions are filled with a homogeneous solid, metal solution 5. The rigidity of the connection of any pair of parts is determined by the parallel θ connection of the contact stiffness of the protrusions and the stiffness of the solid solution between them. Due to the small thickness of the solution layer and at the same time the large elastic modulus inherent to 5 metals, this rigidity is great. Therefore, the natural frequency of the accelerometer is high.

Claims

This invention relates to a measurement technique. Piezoelectric accelerometers are known, which contain a base, an inertial mass, and a sensitive element, between which layers of plastic material 1, 2 are inserted. The disadvantage of such accelerometers is the limitation of the measurement range due to the fact that the natural frequency of the accelerometers is reduced due to the relatively large thickness of the slider, which reduces its rigidity. The purpose of the invention is to expand the measurement range. To do this, in the proposed accelerometer, spacers are introduced between the contacting surfaces of the base, the sensing element and the inertial mass, made of solid homogeneous metal solution filling surface irregularities at the micro irregularities. load (inertial mass) 3, which are pressed to the base and to each other by a spring 4 so that the protrusions of the asperities of the adjacent surfaces the spines are in contact with each other. The gaps between the protrusions are filled with a homogeneous solid, metallic solution 5. The stiffness of the connection of any pair of parts is determined by the parallel connection of the contact stiffness of the projections and the stiffness of the solid solution between them. Due to the small thickness of the layer of the solution and at the same time a large modulus of elasticity characteristic of metals, this rigidity is great. Therefore, the natural frequency of the accelerometer is high. The invention includes a piezoelectric accelerometer comprising a base, an inertial mass, and a sensing element placed between an inertial mass and a base, characterized in that, in order to extend the measurement range, into the accelerometer between the contacting surfaces of the base, the sensing element and

inertial mass gaskets are introduced, made of solid, homogeneous, metallic solution, filling the contacting surfaces at the height of microroughness.

Sources of information taken into account in the examination of 1, I.I. Applied metal glue when making

piezo sensor Sat Instrumentation and Experimental Technique, 1964, 1, p. 226.

2. Osipovich L.A. Precision compact piezoelectric sensors of vibration acceleration type PKD, Sat. Instrument making, 1964, 5, p. 3