SU746291A1 - Apparatus for measuring mechanical vibration parameters - Google Patents

Description

(54) DEVICE FOR MEASUREMENT The device belongs to the field of measurement technology and can be used to record and measure the parameters of mechanical oscillations of low and infra-low frequency, such as those occurring during fluctuations of the earth's crust and large-sized devices and structures. Liquid transducers based on the principles of molecular electronics and using the conversion of the flow of working fluid produced by the action of a measured quantity into an electrical signal 1 and 2 are used to measure variable signals in the low-frequency region. However, they have a predetermined natural frequency and a narrow range frequencies. The closest to the technical essence is the diffusion sensor of mechanical effects 3, which is an electromagnetic transducer of an electrolyte flow into an electrical signal located in a housing, made in the form of a cell, divided into two chambers by a partition in which electrodes are placed, together with the electrolyte, filled redox system, and

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PARAMETERS OF MECHANICAL VIBRATIONS limited by membranes on which an additional inertial mass is mounted, connected with the hull and fixed on an elastic suspension. However, the known transducer has a limited range in the low-frequency region, due to the mechanical parameters of the instrument. The frequency of measured values of inertial-type devices is characterized by the magnitude of the natural frequency of the system, which is determined by the ratio of the coefficient of elasticity — K to the mass of the inertial element — M: o-JWIj where fo is the natural frequency of the system. From this relation, it follows that in order to lower the natural frequency, it is necessary either to increase the moving mass of the system, or to decrease its elastic coefficient (rigidity). The effective influence of parameters on the frequency of a known sensor leads to an unacceptable increase in the size and weight of the instrument. The aim of the invention is to extend the measurement range in the low frequency region. The goal is achieved by introducing an electroosmotic converter fixed in the housing into the well-known diffusion converter, whose membranes are spring-loaded to the housing through the stops and the frame on the one hand and connected to the elastic suspension of the diffusion converter, the electrodes of which are connected to to electrodes of the electroosmotic converter.

The invention is illustrated in the drawing. The low-frequency sensor contains a diffusion converter 1, which is a cell bounded on both sides by membranes 2 and divided into two chambers by a partition in which electrodes 3 are placed, which together with electrolyte 4 are placed, filled (the cell, the redox system, fixed In the housing 5, to the converter membranes there adjoins the inertia mass 6, to which the spring 7 is connected, fixed by the second end to the stripper 8, forming together with the studs 9 and the exhaustion 10 a frame suspended on the spring 11 for unloading, the converter of electrical signals to displacement - the inverter is installed in the upper part of the housing and is an electroosmotic cell made on the basis of a porous partition 12 installed in the housing 13 filled with polar liquid 14, the cell is bounded by membranes 15 and provided with

two electrodes 16, -

The electrodes of the diffusion and electroosmotic converters are connected to an electronic unit 17, which is designed to amplify and convert an electrical signal and has terminals 18 for connecting a re-radiation device. The inertia mass is additionally secured on flat springs 19, protecting it from lateral displacements. The device operates as follows. When mechanically acting, the inertial mass 6, moving relative to the device body, acts on the membranes of the diffusion sensor 2, in which electrolyte flows through the septum, from one chamber to another and on the electrodes 3, an electric signal appears that is proportional to the parameter of mechanical movement. the signal enters the electronic unit and after amplification and the corresponding conversion on the electrodes 16 of the electroosmotic cell. Under the action of this signal, the liquid flows from its one chamber 746291

ry to another, moving the membrane and stops with a frame on which a spring of inertial mass is fixed. Thus, the spring attachment point moves in accordance with the movement of the inertial mass, and, consequently, the additional movement of the inertial mass itself. Depending on the law formed by both transducers and the electronic unit, the additional displacement of the inertial mass may be equivalent to a decrease in the elastic coefficient of the suspension or an increase in the mass of the oscillatory system of the device. This change in the parameters of the elastic system causes a corresponding decrease in the frequency of the own oscillations of the device and, consequently, increases the frequency range of the measured displacements in the low frequency range.

Claims (3)

Invention Formula A device for measuring mechanical vibration parameters, which contains a diffusion of mechanical quantities fixed in a housing into an electrical signal, made in the form of a cell, divided into two chambers by a partition, in which electrodes are placed, which together with the electrolyte filling it, are oxidizing system, and limited by membranes, on which an additional inertial mass is mounted, associated with the hull and fixed on an elastic suspension, characterized in that measurement range in the low-frequency region, an electroosmotic transducer is inserted into it, fixed in the housing, the membranes of which, through the stops and frame, are spring-loaded to the housing on one side, and on the other hand connected with the elastic suspension of the diffusion converter, whose electrodes through the inserted functional unit the amplifier converter is connected to the electrodes of the electroosmotic converter. Sources of information. Taken into account in the examination 1. The author's certificate of the USSR 177645, cl. G 01 M 3/00, 7.06J963. 2. USSR author's certificate No. 230433, class G 01 V 1/18, 24L6.1967. 3. USSR author's certificate No. 448766, cl. G 01 R 15/08, 22.12Д972 (prototype).