Torsional spring type measuring pendulum for low-and-medium-frequency shock spectrum

Abstract

A torsional spring type measuring pendulum for low-and-medium-frequency shock spectrum comprises a base, a torsional spring sleeve, a swing link, a shifting fork A, a mass block, a torsional spring, a supporting rod, a shifting fork B and two sliding pins. The two sliding pins include a sliding pin A and a sliding pin B. In terms of structure, the torsional pendulum structure of the torsional spring type measuring pendulum for shock spectrum has the advantages of reducing device mass and size and making the device portable as compared with the low-frequency vibrator structure for measuring low-frequency shock spectrum; as compared with a reed instrument, the torsional spring type measuring pendulum has the advantages that its hinge structure at the fixed end can prevent the swing link structure from plastic deformation so as to improve service life of the whole measuring device. In terms of function, the torsional spring type measuring pendulum for the shock spectrum can be used for measuring low-and-medium frequency shock spectrum directly and can substitute for the way of measuring the low-and-medium frequency shock spectrum by combination of the reed instrument and the low-frequency vibrator. In terms of measuring way, the torsional spring type measuring pendulum is of a cam structure of the swing link, which converts rotational measurement into linear displacement measurement; thus, compact structure and high measuring precision are achieved.

Description

technical field [0001] The invention belongs to the technical field of shock measurement, and relates to a shock measurement instrument, in particular to a torsion spring type measuring pendulum for measuring medium and low frequency shock spectra. Background technique [0002] At present, the main method of measuring the shock spectrum is to use an accelerometer combined with a mechanical filter to measure the time curve and calculate the shock spectrum. However, the accelerometer will arouse its resonance peak under strong impact, so that the generated charge cannot be released quickly, resulting in zero drift. . The zero drift phenomenon will affect the integrity and accuracy of the measurement of the medium and low frequency shock spectrum. The difference between the measured value and the actual value is one to two orders of magnitude, and the error is large, which is not conducive to the assessment of the medium and low frequency shock resistance technical indicators. ...

AI Technical Summary

Problems solved by technology

However, neither the reed meter nor the low-frequency vibrator can measure alone to obtain a complete mid-low frequency shock spectrum curve. When the reed meter measures the low frequency spectrum, due to the relatively large displacement response of the end mass, the root of the reed meter breaks due to excessive stress; When the spring vibrator measures the low frequency spectrum, due to the low frequency and the large amount of stretching and compression of the spring, the spring vibrator is relatively bulky

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