Bundled fiber fracture sound measuring device and method adopting symmetric displacement of tandem pickups

Abstract

The invention relates to a bundled fiber fracture sound measuring device and method adopting symmetric displacement of tandem pickups. The device is composed of the pickups arranged in a tandem lineararray, an information collecting module and an analysis system, the number of the tandem pickups is m, and each pickup is composed of a parabolic semispherical cover and a micro microphone arranged on the focal point of the parabola. The method adopting the measuring device comprises the steps that when a fiber bundle is stretched to crack, the crack sound is transferred to the closest pickup with the highest sound energy to be recorded. According to the crack pulse measured by the pickup, the number of the cracking fibers in the area and the sound intensity of the cracking fibers can be obtained, the number of the highest pulse values measured by all the pickups at the same time is the total number of the cracking fibers and the approximate area of cracking of the fibers, and the cracking degree of a single fiber is determined according to the peak value. The sound measuring device can serve as a functional assembly on a bundled fiber strength tester or independently used, and can beused for measuring the average cracking intensity, variation coefficient and average cracking elongation at break of the single fiber.

Description

technical field [0001] The invention relates to a device and method for measuring the fracture sound of bundle fibers with symmetrical displacement of longitudinal pickups, and belongs to the technical field of textile fiber testing. Background technique [0002] In spinning technology, the breaking strength of parallel bundle fibers is closely related to yarn quality, and its elongation and strength show a high correlation with the measured single fiber. Therefore, the detection of the internal mesoscopic deformation, damage and fracture process of bundle fibers has become an urgent need for scientific research and engineering practice. [0003] At present, when measuring the elongation and fracture characteristics of fiber materials, it is generally carried out by high-speed photography. Using a high-speed camera, the whole process of fiber elongation and fracture after being stressed is photographed, and then through a projector, the instantaneous fiber shape and the who...

AI Technical Summary

Problems solved by technology

But this method can only be measured for a single root or a single layer with intervals between fibers

For the measurement of bundled fibers, the fibers are closely connected and the mechanical vibration caused by acoustic emission will inevitably have mutual influence and cannot be measured.

The Chinese patent application number is CN200710176151.2, a method for focusing array noise signals in target noise measurement, using multi-channel time-delay focus alignment method for sound collection, but this method cannot be applied to the collection of weak fractures of bundle fibers and detection

[0005] US Patent No. US 2007 / 0218806 Al introduces a method for non-destructive testing of carbon fiber composite materials, using embedded sensors to measure fiber fracture sound, this method only Whether the fiber is broken or damaged can be judged by whether the sensor has a signal, and the degree of damage cannot be determined

US Patent No. US 5104391 discloses a device and method for measuring the breaking sound of a single optical fiber, but it cannot be applied to the measurement of the breaking sound of ordinary bundle fibers

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