Large-load low-intermediate frequency three-direction reed instrument

Abstract

The invention provides a heavy load intermediate frequency three-way reed instrument, which is mainly used to improve the measuring precision at the low frequency part of shock response spectrum. The technical proposal adopted is that a set of long bolts arranged horizontally and longitudinally are fixed near the top of a support of a three-way reed instrument, a set of reeds that is used to measure the horizontal and longitudinal impacts is fixed on each long bolt, free ends of the reeds are provided with block scriber components and roots are fixed on the bolts. The free end of each reed hangs downward and is suitable for measuring and recording the shock response spectrums of strong-impact input in intermediate and low frequency bands.

Description

Technical field [0001] The invention relates to a sudden change instrument for measuring impact or acceleration, in particular to a reed instrument. Background technique: [0002] The high-load low-medium frequency three-way reed meter is a special instrument and equipment for impulse response spectrum testing. It can usually be measured in harsh environments such as underwater non-contact explosions on a real ship. It does not require a power source during operation and is not affected by the surrounding environment. Interference has high reliability. The structural feature of the existing three-way reed meter is that three sets of reeds are arranged on the frame of the reed meter, and the arrangement of the reeds is three-way symmetrical, and they are used to measure the vertical, vertical and horizontal directions. In order to realize its measurement function, the reed is sleeved on a long screw through the through hole at its root. A distance pad is set between each reed. The...

AI Technical Summary

Problems solved by technology

The structural feature of the existing three-way reed meter is that three groups of reeds are arranged on the frame of the reed meter, and the arrangement of the reeds is three-way symmetry, which are used to measure the vertical, longitudinal and transverse directions respectively. In order to realize its measurement function, the reeds are sleeved on a long screw rod through the through hole at the root, and distance pads are arranged between each reed, and the screw is screwed on the frame with nuts. The end is provided with a mass scribing needle assembly, and the needle tip of the scribing needle sticks to the recording scribing plate fixed on the frame. When measuring, the reed is subjected to impact input to generate vibration and deformation, and drives the scribing needle at the end to record. Scratches for measurement records are engraved on the board, that is, the maximum displacement response value of the impact is accurately recorded, and the measurement function of the instrument is realized; the main structural features of the above-mentioned existing three-way reed instrument are: two sets of reeds for measuring longitudinal and transverse impacts , the long screws for fixing the reeds are set under the instrument frame, that is, fixed near the bottom of the frame, therefore, the roots of the reeds fixed on the long screws are located under the instrument frame, with The upper end of the reed of the block marking needle assembly is located above the instrument frame, and the reed is a vertical rod structure with a fixed bottom. Since the natural frequency of the reed in the above-mentioned three-way reed instrument is relatively high, the lowest value of the frequency is also At 7Hz left and right, so the rigidity of these reeds is relatively high. Although the above-mentioned vertical rod type and the unstable reed structure with a weight on the top are adopted, the problem of instability is not particularly prominent during the use of the instrument, and has not yet occurred. The instability of the reed affects the measurement accuracy of the instrument

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