Summary

A time-dependent variable resistance element (VR) has been added to NETWORK. An example analysis is shown in Fig. 1 for the model described in "Improvement of Power Supply Input Method"（ with the addition of the variable resistor element.

Explanation

The circuit represented in Fig. 1 is represented by the data in Table 1. Table 2 shows the input format for the time-dependent variable resistance element (VR). While a constant resistance value ($\Omega$) is entered for the resistance element ($R$), for the variable resistance element, the time variation of the resistance value is specified by a time variation identification number (TIME_ID). A variable resistance element ($VR$) can be given a step change in resistance as shown in Table 3. In this example, the resistance is zero from time 0 to 0.1 second, and 1 $k \Omega$ from 0.1 to 0.2 seconds. (This data is equivalent to the data for the switch used in the "Improvement of Power Supply Input Method".) Of course, a continuous resistance change can also be analyzed. The analysis results of this example are shown in Fig. 2 and are in good agreement with the analysis values calculated from the resistance and inductance of the coil.

Table 1. NETWORK Data

* NETWORK * REGION_FACTOR * NETWORK 8 * FEM * ID * NODE1 * NODE2 * SERIED_ID * FEM 1 1 2 　　 1 * R * ID * NODE1 * NODE2 * RESISTANCE * R 2 2 3 5.0 * VPS * ID * NODE1 * NODE2 * TIME_ID * VPS 3 　 3 4 1 * VR * ID * NODE1 * NODE2 * TIME_ID * VR 5 　 4 1 2 * END NETWORK * END

Table 2. Variable Resistance Element Input Form

17.8.15 Variable resistance elements
row	string	Name	Type	Content
1	1	VR	S	Title Represents time-dependent variable resistance.
	2	ID	I	element identification number
	3	START	I	starting node number
	4	END	I	endpoint node number
	5	TIME_ID	I	Time-varying identification number (18). Resistance ($\Omega$) as a function of time. The time variation may be varied stepwise.

S: String type , I: Integer type

Table 3. Example of resistance time variation data for variable resistance elements

* TIME_ID * OPTION * 2 1 * NO_TIME_POINTS * 4 * Time(sec) * Value * 0.0 0 0.1 0 0.1 1.0e3 0.2 1.0e3

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Analysis Model

Sample data DL

・ input_var_resistor : Input condition file
・ pre_geom2D.neu : Mesh file
・ 2D_to_3D : 3D extension file