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我在xansys.net上发的帖子,mike给回复的,但有些疑问,希望能帮我解答一下呀。
我的原贴:
This test includ=
es the signal-generator (constant, sinusoidal signal,random signal), the sensor and wire, data collected device. Two ends of wire are the sensor and collector. The sensor converts the mechanical signal into eletric signal including the voltage signal and eletric charge signal. Usually, the signal gathered by collector is often voltage signal with the order of mv The radius of wire is about 1mm, and the wire is located in heating-furnace. The rise time is controlled by heating furnace. This is all the working process.
So, the solid69 is suit for the analysis if the frequency is lower the certain limit and the rise time is ignored.However, I can't get the output voltage corresponding input voltage. I have studied the vm185, and think the current density*rsvx is the voltage through the cross-section. Is it correct? If not, what parameter is calculated as the output voltage.
I wanted to use the circur124 as the independent voltage source, but it is only compatible with solid97 or plane53. Please give me your advice.
Thanks very much and best wishes to you.
the reply of mike:
With the 1mm wire, unless the signal is 5KHz and higher, there is no need to model the skin effect. I do not think the mechanical motioncould result in a rise sufficiently short to result in eddy currents. I have seen explosions result in property changes with short time spans,but I do not think this is your case. You are right, the 69 is a suitable element and the VOLT for the 69 is a physical volt. So youshould not have to calculate the voltage drop other than taking the difference of the VOLT dof. In current conduction, you would normallyassociate a voltage drop with a current flow. The problem with using I*R is that R is changing along the wire due to the temperature and could besufficiently different in the radial direction through the wire which requires this variation in rsvx be taken into account. For this reason,the voltage drop from start to end is best calculated using the VOLT dof at each end. |
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