SU1597650A1 - Vibration-testing machine for checking geophones - Google Patents

Abstract

This invention relates to a testing technique. The purpose of the invention is the expansion of operational capabilities. The goal is achieved by determining the sensitivity of the seismic receivers to oscillations in different directions, as well as to rotational oscillations. The device differs in that it contains two exciters 6 and 7 oscillations installed at opposite points of the vibrating platform 1 and made in the form of three seismic receivers. Providing the device with a velocity filter and an offset filter allows one to realize a constant mode of oscillatory velocities or oscillatory displacements. The location of the seismic receivers allows realizing the mode of translational oscillations with the in-phase switching on of the same-named seismic receivers of the causative agents 6 and 7 of the oscillations and the rotational oscillation mode with the antiphase switching on of the seismic receivers forming a pair of elements diametrically opposed to the center of mass of the platform. 1 hp ff, 3 ill.

Description

and the replacement of the oscillation constant up to the Measurement Modes and dividers, and the apparent accelerations by the constant oscillation velocity in the post-resonance frequency range

The displacement filter 1 expands the frequency range in the mode of generating oscillatory displacements upward from the frequency IdCo of the frequency co ,, determined by the resonance of the oscillating circuit from capacitance 24 and inductance 25, 50 This is achieved by the fact that at frequencies below tOg, the exciting signal is uniform attenuated by capacitive divider 23 and 24, and the higher frequency, the attenuation decreases accordingly due to an increase in the impedance of the oscillating circuit 24-25-26 (due to the impedance of capacitance 1 9) in comparison with the capacitive impedance of 17 "

The vibration exciter is made in the form of three seismic receivers installed on the vibroplatform so that their sensitivity axes are mutually orthogonal, the first and second exciters are installed at opposite points of the vibroplatform relative to its center so that the sensitivity axes of these first and second vibration exciters are pairwise parallel, the output of the electric generator . The signal: a is connected to the inputs of the velocity filter, displacement filter and to the first input switching the measurement measurement bodies, the second and third inputs of which are respectively connected to the outputs of the filter of scattering and fi-tcr offset 1, the output of the measurement mode switch of the measurement modes and dividers, each the vibration exciter is made in the form of three seismic receivers installed on the vibration platform so that their sensitivity axes are mutually orthogonal, the first and second vibration exciters are installed at opposite points of the vibration platform tnositelno its center so that sensitivity axes of the first and second geophones exciters respectively in pairs parallel, the generator electrical output. The signal: a is connected to the inputs of the velocity filter, displacement filter and to the first input of the measurement resistive switch, to the second and third inputs of which, respectively, the outputs of the scatter filter and the fiber of the displacement 1 are connected, the output of the measurement mode switch is below.

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Editor Eopapp

Compiled by "Tavlinov

Tehred L. Oliyyyk Proofreader T O

 Order 3045

Tlipazh 439

VSHI11N State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., D. 4/5

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Claims (2)

The claims “1. Vibration test bench for testing geophones, containing a base, 25 vibration platform, an elastic suspension for attaching the platform to the base, the first vibration exciter, made in the form of a seismic receiver and located on the vibration platform, and an electric signal generator 30 associated with the vibration exciter, and with and without I mean that, in order to expand operational capabilities by determining the sensitivity of geophones to vibrations of different directions, as well as to rotational vibrations, it is equipped with a second vibra exciters, a velocity filter and an offset filter, a switch of measurement modes and dividers, each exciter is made in the form of three seismometers mounted on a vibration platform so that their sensitivity axes are mutually orthogonal, the first and second vibration exciters are installed at opposite points of the vibration platform relative to its center so that the axes sensitivities of the seismic sensors of the first and second vibration exciters are respectively paired in parallel, the output of the electric generator, the signal is connected to the input s velocity filter, the filter offset and first input measuring mode switch, to the second and third inputs which respectively connected to the outputs of the filter skots growth and filter displacements, yield measurement mode switch under ⁷ 1597650 8 keys to the inputs of dividers whose outputs are respectively connected to the geophone first and second vibration exciter 2 <> Vibrostend pop. 1, characterized in that, in order to ensure constancy of vibrational velocities and displacements, the speed filter is made in the form of parallel connected integrating and differentiating circuits, and the displacement filter is made of figurative and consists of aperiodic capacitive and oscillatory capacitive inductive impedances