SU474740A1 - String accelerometer - Google Patents

Description

The invention relates to the field of measurement technology and can be applied in the construction of three-component string accelerometers.

The known three-component string accelerometers containing 6 jets, on which a mass is suspended in the body, have a slightly increased weight and volume due to six autogenerators for exciting the strings.

The proposed accelerometer differs from the known ones in that the attachment points of the strings in the body are located at the vertices of a regular tetrahedron, the center of which is the center of gravity of the inertial mass.

This reduces the weight and size of the accelerometer by reducing the number of strings and ic 6 autogenerators by 4.

If from the vertices of a regular triangular pyramid, in which all the side faces and the base are regular identical triangles, are placed on opposite faces of height, then the latter will intersect at one point, and form the same angle equal to 110 ° 12 between them.

FIG. 1 shows the proposed device; in fig. 2 is a diagram, as shown, and a principle of its operation.

The jet accelerometer consists of a hermetic enclosure, including;

cup / -4. Strings 5-8 are fixed at one end in the glasses and psolated from them by means of insulating sleeves 9, and at the other end are fixed in an inertial mass 10. Strings vibrate in the field of permanent magnets / UM.

The points A, B, C, D denote the points of attachment of the strings, the point O denotes the center of gravity of the mass, and the strings. Under the action of the measured acceleration, the inertial mass is displaced relative to the body, which leads to a violation of the ratio of the output frequencies of the strings / 1- / 4, which are fed to the inputs of frequency meters 15-18 and then to the recording and processing equipment.

The sum of yfA deviations of the output frequencies of the str / i; / 2; / 3 and / 4 accelerometer is pro-proportional to the magnitude of the current acceleration.

The direction of the measured acceleration vector is determined with respect to the longitudinal axis of the strings, i.e., four angles are determined from the relations:

/.,

/ 3

 COS and COS 8

COS 7 cos /

where a, p, t. J are the angles of the interface between the vector A and 30 strings.

Subject invention

String accelerometer containing inertial mass iodine in the Cornus on the strings, and excitation units of each

strings, characterized in that, in order to reduce the weight and volume, the attachment points of the strings in the housing are located at the vertices of a regular tetrahedron, the center of which is the center of gravity of the inertial mass.

7 1