Studies on Electronic Universal Testing Machine of Material:Part 1 : Trial production of Tensile Testing Machine
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概要
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An electronic tensile machine to test load-extension behavior under any load or extension with a linear or non-linear motion has been trially built.<BR>This machine consists of three parts:<BR> i) Analog computer: This is a device to convert any load or extension into electric pressure and supply it to the amplifier of servo mechanism.<BR>ii) Automatic controller: This is a device to supply input to test pieces according to a programmed function.<BR>iii) Detector and recorder of the output.<BR>The dynamic characteristics of the machine are:<BR>1) In case of a test under any load, the open-loop transfer function is expressed by the following equation, and even at| G | =45 dB, the stability of frequency characteristics tested on a spring as a test piece is a stable system under ω≤45 rad/sec.<BR>G<SUB>of</SUB> (s) = K<SUB>A</SUB> G<SUB>P</SUB>(s)/<SUP>s</SUP>(T<SUB>M</SUB><SUP>s</SUP>+1) (s) e<SUP>-Ls</SUP><BR>where Gp (s) is the transfer function of the testpiece.<BR>2) In case of a test under any extension, the characteristic equation of open-loop control system is shown by the following equation:<BR>G<SUB>ox</SUB> (s) =K<SUB>B</SUB>/ <SUP>s</SUP>(T<SUB>M</SUB><SUP>s</SUP>+1) e<SUP>-Ls</SUP><BR> The frequency characteristic is analogous to that of the above result 1) tested on a spring.<BR> 3) The closed-loop transfer function of a test under any load is expressed by the following equation, and the frequency characteristics of it tested on the spring is stable in the state of |G|=32.5 dB, ω ≤ 3O rad/sec.<BR>G<SUB>f</SUB>(s) = K<SUB>e</SUB>/T<SUB>M</SUB><SUP>s2</SUP>+{1-k<SUB>D</SUB>LGp(s)}s+K<SUB>D</SUB>Gp(s) e<SUP>-Ls</SUP><BR>4) The closed-loop transfer function tested under any extension is shown by the following equation, and the stability of frequency characteristic of it tested on a spring is identical to the above result 3) tested on a spring.<BR>G<SUB>x</SUB> (s) = K<SUB>H</SUB>Gp(5)/T<SUB>M</SUB><SUP>s2</SUP>+(1-K<SUB>B</SUB>L)s+K<SUB>B</SUB> e<SUP>-Ls</SUP><BR>5) A few applied methods of this apparatus are described. Accordingly, this testing machine has been proved to able usable for any tests of materials.
- 社団法人 日本繊維機械学会の論文