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Investigation of Twist Waves Distribution along Structurally Nonuniform Yarn

Shukhratov Sh., Milašius R., Gafurov K., Gafurov J.

Autex Research Journal

2022

Vol. 22, no. 4

488--492

This paper presents the features of yarn structure formation on spinning machine, i.e. yarn twist change when winding. It was considered that the twist distribution was one of the reasons for its decrease along the formed yarn. In this paper, based on analysis of changes in thickness and twist due to axial deformation, we consider a yarn moving at constant speed. Moving dynamics of yarn are studied here by using Euler variables. The correspondences of forward and reverse twist waves’ distribution speeds on presented frequency at various vibration forms are obtained. The parameters of Doppler effect for the waves distributed along the yarn are determined.

Time-domain filtering of seismic rotation waves

Nowożyński K., Teisseyre K.

Acta Geophysica Polonica

2003

Vol. 51, nr 1

51-61

Rotational parts of seismic waves are extracted from recordings of differential seismic signals. Thus, all differences in responses of the seismometers cause disturbances which obscure these hidden components. The method of removing great part of these disturbances is developed, based on the time-domain filtering and using the data collected over a selected period of seismic monitoring called the test phase. Examples of seismic rotation components for some events registered in the Ojców observatory are shown, together with results of checking the adequacy of the presented method.

Recording the seismic rotation waves: reliability analysis

Teisseyre R., Suchcicki J., Teisseyre K.

Acta Geophysica Polonica

2003

Vol. 51, nr 1

37-50

An estimation of reliability of seismic rotation waves is based on the data collected with the use of rotation horizontal seismographs; each rotation seismograph system consists of two anti-parallel seismographs. The test and working positions of the rotation seismographs enable us to use the filtering procedure in the FFT domain in order to approach the identity of seismograph responses for each system; this procedure is applied for the collected data. Reliability of records of seismic rotation waves is based on the estimated ranges of the mean square values of the errors (test position) and of the rotation and twist components (working position). In this way, we get a proof about the existence of seismic rotation waves, at least those rotation components of seismic waves which originate near the surface and close to the observation site. This proof may be very important for the earthquake engineering problems. The question of a possibility of reducing far-distance rotation effects, as those related to seismic source process, remains open.