<div class=MsoNormal style="MARGIN: 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>Hi,</FONT></div> <div class=MsoNormal style="MARGIN: 0pt; TEXT-ALIGN: justify"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></div> <div class=MsoNormal style="MARGIN: 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>I am investigating dynamic characteristics of a torsional rectangular capacitive micromirror made up of a plate suspended by two beams. Clearly we have two modes of motion (torsional and vertical). I have a problem about the relationship between torsional and vertical damping coefficients. I have derived a relationship but don't know whether it is true or not. Knowing that C<SUB>vertical</SUB>=A/h<SUP>3</SUP>, from linearized Reynolds equation, where h is gap, and A is a physical parameter that I don’t mind because I just want to derive relationship between
C<SUB>vertical</SUB> and C<SUB>torsional</SUB>. Anyway integrating over the plate to derive the torsional damping factor: int(A/h<SUP>3</SUP>*x*dx) gives a relationship C<SUB>tor</SUB>=L<SUP>2</SUP>*C<SUB>ver</SUB>. This relationship also seems to be true dimensionally. But the problem is that by deriving these equations in fact I have utilized the superposition principal which is true about linear systems. So I would be so grateful if someone told me if this relationship is true as an approximation or if not introduced me some references or told me what to do.</FONT></div> <div class=MsoNormal style="MARGIN: 0pt; TEXT-ALIGN: justify"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></div> <div class=MsoNormal style="MARGIN: 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>Very thanks.</FONT></div> <div class=MsoNormal style="MARGIN: 0pt; TEXT-ALIGN: justify"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></div><p> 
<hr size=1>Be a better friend, newshound, and
know-it-all with Yahoo! Mobile. <a href="http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ "> Try it now.</a>