In order to retrieve the pull-in limit, derivative of V in (13) with respect to δ has to be taken and equate the result to zero and this position is named as pull-in limit [9]. The upper beam will be unstable and collapse towards bottom beam after this critical point. Since the ...
The position of pipes also varies along the depth of the borehole. However, in the absence of any a priori knowledge of the pipe positions, it is reasonable to assume that the heat exchanger pipes are symmetrically placed about the center of the borehole. So far, closed-form multipole ...