Experimental Teaching Platform of Simple Harmonic Motion Based on Human-machine Engineering

Laboratories of IoT Engineering are occupied an important position in education industry. This paper, with the goal of grasping developing tendency and improving the application ability and combined with the characteristics of the Internet of Things Engineering of Southwest University of Science and Technology (SWUST) which focused on the training of application-oriented talent, proposed the experimental teaching programs of the Internet of Things Engineering and completed the development of experimental teaching platform. Its significance lies: to improve the level of teaching and research, improve the application ability of students, promote students employment, and enhance the competitiveness of the school.

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Response characteristics of electromagnetic seismographs and their dependence on the instrumental constants

Bulletin of the Seismological Society of America ◽

10.1785/bssa0390030205 ◽

1949 ◽

Vol 39 (3) ◽

pp. 205-218

Author(s):

S. K. Chakrabarty

Keyword(s):

General Solution ◽

Equation Of Motion ◽

Harmonic Motion ◽

Response Characteristics ◽

Local Earthquakes ◽

Simple Harmonic Motion ◽

The Earth ◽

Electromagnetic Seismograph ◽

Different Types ◽

Proper Values

Summary The equation of motion of the seismometer and the galvanometer in an electromagnetic seismograph has been derived in the most general form taking into consideration all the forces acting on the system except that produced by hysteresis. A general solution has been derived assuming that the earth or the seismometer frame is subjected to a sustained simple harmonic motion, and expressions for both the transient and the steady term in the solution have been given. The results for the particular case when the seismograph satisfies the Galitzin conditions can easily be deduced from the results given in the present paper. The results can now be used to study the response characteristics of all electromagnetic seismographs, whether they satisfy the Galitzin conditions or not, and will thus give an accurate theoretical picture of the response also of seismographs used for the study of “local earthquakes” and “microseisms” which do not in general obey the Galitzin conditions. The results obtained can also be used to get analytically the response of the seismographs for different types of earth motion from the very beginning, and not only after the transient term has disappeared. The theory of the response to simple tests used to determine the dynamic magnification of any seismograph and also to determine and check regularly the instrumental constants of the seismographs has been worked out. The results obtained can also be used for ascertaining the proper values of the instrumental constants suitable for the various purposes for which the seismographs are to be used.

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