cable_checks.F90
28 KB
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!
! This file is part of SACAMOS, State of the Art CAble MOdels in Spice.
! It was developed by the University of Nottingham and the Netherlands Aerospace
! Centre (NLR) for ESA under contract number 4000112765/14/NL/HK.
!
! Copyright (C) 2016-2017 University of Nottingham
!
! SACAMOS is free software: you can redistribute it and/or modify it under the
! terms of the GNU General Public License as published by the Free Software
! Foundation, either version 3 of the License, or (at your option) any later
! version.
!
! SACAMOS is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! for more details.
!
! A copy of the GNU General Public License version 3 can be found in the
! file GNU_GPL_v3 in the root or at <http://www.gnu.org/licenses/>.
!
! SACAMOS uses the EISPACK library (in /SRC/EISPACK). EISPACK is subject to
! the GNU Lesser General Public License. A copy of the GNU Lesser General Public
! License version can be found in the file GNU_LGPL in the root of EISPACK
! (/SRC/EISPACK ) or at <http://www.gnu.org/licenses/>.
!
! The University of Nottingham can be contacted at: ggiemr@nottingham.ac.uk
!
! File Contents:
! SUBROUTINE gt_zero_check(p,cable_spec_error,cable_name,message)
! SUBROUTINE cylindrical_check(r,cable_spec_error,cable_name,message)
! SUBROUTINE cylindrical_with_dielectric_check(r,rd,cable_spec_error,cable_name,message)
! SUBROUTINE coax_with_dielectric_check(r,rs,rd,cable_spec_error,cable_name,message)
! SUBROUTINE twisted_pair_check(r,rd,s,cable_spec_error,cable_name,message)
! SUBROUTINE shielded_twisted_pair_check(r,rd,s,rs,rd2,cable_spec_error,cable_name,message)
! SUBROUTINE spacewire_check(r,rd,s,rs,rd2,stpr,rs2,rd3,cable_spec_error,cable_name,message)
! SUBROUTINE rectangular_check(w,h,cable_spec_error,cable_name,message)
! SUBROUTINE flex_cable_check(w,h,s,dxo,dyo,cable_spec_error,cable_name,message)
! SUBROUTINE dielectric_check(epsr,cable_spec_error,cable_name,message)
! SUBROUTINE transfer_impedance_check(Zt,cable_spec_error,cable_name,message)
! SUBROUTINE conductivity_check(sigma,cable_spec_error,cable_name,message)
! SUBROUTINE surface_impedance_check(Zt,sigma,rs,t,cable_spec_error,cable_name,message)
!
! NAME
! gt_zero_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that a parameter,p, is greater than zero
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 14/11/2016 CJS
! 3/8/2017 return with error message
! 16/11/2017 CJS Include network synthesis process to replace s-domain transfer functions
!
!
SUBROUTINE gt_zero_check(p,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: p ! input test parameter
logical,intent(INOUT) :: cable_spec_error ! error flag
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
if (p.LE.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Parameter is less than or equal to zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE gt_zero_check
!
! NAME
! cylindrical_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining a cylindrical cable are consistent
! The wire radius must be greater than zero
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE cylindrical_check(r,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: r
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
if (r.LE.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Radius is less than or equal to zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE cylindrical_check
!
! NAME
! cylindrical_with_dielectric_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining a cylindrical cable with dielectric are consistent
! the wire radius must be greater than zero and
! the dielectric radius must be greater than or equal to the conductor radius.
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE cylindrical_with_dielectric_check(r,rd,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: r
real(dp),intent(IN) :: rd
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
CALL cylindrical_check(r,cable_spec_error,cable_name,message)
if (rd.LT.r) then
write(*,*)'Error in cable:',trim(cable_name)
message='Dielectric radius is less than the condcutor radius'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE cylindrical_with_dielectric_check
!
! NAME
! coax_with_dielectric_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining a coax cable are consistent
! the inner wire radius must be greater than zero and
! the shield radius must be greater than the conductor radius.
! the dielectric radius must be greater than or equal to the shield radius.
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE coax_with_dielectric_check(r,rs,rd,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: r
real(dp),intent(IN) :: rs
real(dp),intent(IN) :: rd
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
CALL cylindrical_check(r,cable_spec_error,cable_name,message)
if (rs.LE.r) then
write(*,*)'Error in cable:',trim(cable_name)
message='Shield radius is less than or equal to the condcutor radius'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if (rd.LT.rs) then
write(*,*)'Error in cable:',trim(cable_name)
message='Dielectric radius is less than the shield radius'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE coax_with_dielectric_check
!
! NAME
! twisted_pair_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining a twisted pair cable with dielectric are consistent
! the wire with dielectric checks must be satisfied plus
! the two wires must not touch i.e. the twisted pair separation must be greater than twice the dielectric radius
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE twisted_pair_check(r,rd,s,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: r
real(dp),intent(IN) :: rd
real(dp),intent(IN) :: s
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
CALL cylindrical_with_dielectric_check(r,rd,cable_spec_error,cable_name,message)
if (s.LE.rd*2d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='twisted pair separation is less than or equal to twice the dielectric radius'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE twisted_pair_check
!
! NAME
! shielded_twisted_pair_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining a shielded twisted pair cable with dielectric are consistent
! the twisted pair checks must be satisfied
! the shield must not intersect the twisted pair wires
! the shield dielectric radius must be greater than or equal to the shield radiius
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE shielded_twisted_pair_check(r,rd,s,rs,rd2,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: r
real(dp),intent(IN) :: rd
real(dp),intent(IN) :: s
real(dp),intent(IN) :: rs
real(dp),intent(IN) :: rd2
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
CALL twisted_pair_check(r,rd,s,cable_spec_error,cable_name,message)
if (rs.LE.s/2d0+rd) then
write(*,*)'Error in cable:',trim(cable_name)
message='Shield intersects the twisted pair wires'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if (rd2.LT.rs) then
write(*,*)'Error in cable:',trim(cable_name)
message='Dielectric radius is less than the shield radius'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE shielded_twisted_pair_check
!
! NAME
! spacewire_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining spacewire are consistent
! the shielded twisted pair checks must be satisfied
! the four shielded twisted pairs must not intersect
! the outer shield must not intersect the shielded twisted pairs
! the outer dielectric radius must be greater than or equal to the outer shield radius
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE spacewire_check(r,rd,s,rs,rd2,stpr,rs2,rd3,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: r
real(dp),intent(IN) :: rd
real(dp),intent(IN) :: s
real(dp),intent(IN) :: rs
real(dp),intent(IN) :: rd2
real(dp),intent(IN) :: stpr
real(dp),intent(IN) :: rs2
real(dp),intent(IN) :: rd3
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
CALL shielded_twisted_pair_check(r,rd,s,rs,rd2,cable_spec_error,cable_name,message)
if (stpr.LE.sqrt(2d0)*rd2) then
write(*,*)'Error in cable:',trim(cable_name)
message='Shielded twisted pairs intersect'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if (rs2.LE.rd2+stpr) then
write(*,*)'Error in cable:',trim(cable_name)
message='Outer shield intersects the shielded twisted pairs'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if (rd3.LT.rs2) then
write(*,*)'Error in cable:',trim(cable_name)
message='Outer dielectric radius is less than the outer shield radius'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE spacewire_check
!
! NAME
! rectangular_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining rectangular conductors are consistent
! the conductor width and height must both be greater than zero
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE rectangular_check(w,h,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: w
real(dp),intent(IN) :: h
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
if (w.LE.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Conductor width is less than or equal to zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if (h.LE.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Conductor height is less than or equal to zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE rectangular_check
!
! NAME
! flex_cable_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining flex cable are consistent
! the conductor width and height must both be greater than zero
! the conductor separation must be greater than zero if there is more more than one conductor
! the dielectric offset in x and y must be greater than or equal to zero
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE flex_cable_check(nc,w,h,s,dxo,dyo,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
integer,intent(IN) :: nc
real(dp),intent(IN) :: w
real(dp),intent(IN) :: h
real(dp),intent(IN) :: s
real(dp),intent(IN) :: dxo
real(dp),intent(IN) :: dyo
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
CALL rectangular_check(w,h,cable_spec_error,cable_name,message)
if (s.LT.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='conductor separation is less than zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if ((nc.GT.1).AND.(s.EQ.0d0)) then
write(*,*)'Error in cable:',trim(cable_name)
message='conductor separation is zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if (dxo.LT.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Dielectric offset in x is less than zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
if (dyo.LT.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Dielectric offset in y is less than zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE flex_cable_check
!
! NAME
! ML_flex_cable_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining a multi-layer flex cable are consistent
! This check takes the width, height and offset of two rectangles and checks whether they intersect
! It is used for checking intersection of rows of conductors and conducotrs and dielectric in flex cable models
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
!
! started 12/6/2018 CJS, based on flex_cable_check
!
!
SUBROUTINE ML_flex_cable_check(w1,h1,ox1,oy1,w2,h2,ox2,oy2,check_type,cable_spec_error,cable_name,message)
real(dp),intent(IN) :: w1,h1
real(dp),intent(IN) :: ox1,oy1
real(dp),intent(IN) :: w2,h2
real(dp),intent(IN) :: ox2,oy2
integer,intent(IN) :: check_type
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
logical :: intersect,internal
real(dp) :: p1,p2,p3,p4
logical :: internalp3,internalp4
logical :: intersectx,internalx,externalx
logical :: intersecty,internaly,externaly
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
intersect=.FALSE.
internal=.FALSE.
intersectx=.FALSE.
internalx=.FALSE.
externalx=.FALSE.
intersecty=.FALSE.
internaly=.FALSE.
externaly=.FALSE.
p1=ox1-w1/2.0
p2=ox1+w1/2.0
p3=ox2-w2/2.0
p4=ox2+w2/2.0
internalp3=.FALSE.
internalp4=.FALSE.
if ((p3.GE.p1).AND.(p3.LE.p2)) internalp3=.TRUE.
if ((p4.GE.p1).AND.(p4.LE.p2)) internalp4=.TRUE.
if (internalp3.AND.internalp4) then
intersectx=.TRUE.
internalx=.TRUE. ! rectangle 2 is inside rectangel1
else if (internalp3.OR.internalp4) then
intersectx=.TRUE.
internalx=.FALSE.
else
! p3 and p4 are outside the p1-p2 range, we now nead to decide if p1-p2 is inside the range p3-p4
if ((p3.LT.p1).AND.(p4.GT.p2)) then
intersectx=.TRUE.
externalx=.TRUE. ! rectangle 2 is outside rectangel1
end if
end if
p1=oy1-h1/2.0
p2=oy1+h1/2.0
p3=oy2-h2/2.0
p4=oy2+h2/2.0
internalp3=.FALSE.
internalp4=.FALSE.
if ((p3.GE.p1).AND.(p3.LE.p2)) internalp3=.TRUE.
if ((p4.GE.p1).AND.(p4.LE.p2)) internalp4=.TRUE.
if (internalp3.AND.internalp4) then
intersecty=.TRUE.
internaly=.TRUE. ! rectangle 2 is inside rectangel1
else if (internalp3.OR.internalp4) then
intersecty=.TRUE.
internaly=.FALSE.
else
! p3 and p4 are outside the p1-p2 range, we now nead to decide if p1-p2 is inside the range p3-p4
if ((p3.LT.p1).AND.(p4.GT.p2)) then
intersecty=.TRUE.
externaly=.TRUE. ! rectangle 2 is outside rectangel1
end if
end if
if (intersectx.AND.intersecty) intersect=.TRUE.
if (internalx.AND.internaly) internal=.TRUE.
if (externalx.AND.externaly) internal=.TRUE. ! rectangle 2 is outside rectangel1
if ( (check_type.EQ.1).AND.(intersect) ) then
! we are checking conductor intersections
write(*,*)'Error in cable:',trim(cable_name)
message='conductors intersect'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
! this is the chek for dielectrc being outside the condustor row, the dielectric is shape 2 when
! the subroutine is called
if ( (check_type.EQ.2).AND.( .NOT.(externalx.AND.externaly) ) ) then
write(*,*)'Error in cable:',trim(cable_name)
message='Dielectric intersects conductors'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
RETURN
END SUBROUTINE ML_flex_cable_check
!
! NAME
! dielectric_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining dielectric models are consistent
! d.c. relative permittivity must be greater than or equal to 1
! high frequency relative permittivity must be greater than or equal to 1
! the poles of the rational function must be on LHS of the s-plane (time domain stability requirement)
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE dielectric_check(epsr,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
type(Sfilter),intent(IN) :: epsr
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
real(dp) :: epsr_value
logical :: stable
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
! Check that the d.c. relative permittivity is greater than or equal to 1.0
epsr_value=epsr%a%coeff(0)/epsr%b%coeff(0)
if (epsr_value.LT.1d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Relative permittivity is less than 1.0 at d.c.'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
! Check that the relative permittivity is greater than or equal to 1.0 at high frequency
epsr_value=evaluate_Sfilter_high_frequency_limit(epsr)
if (epsr_value.LT.1d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Relative permittivity is less than 1.0 at high frequency'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
! check that the poles of the filter function are in the LHS of the s plane
CALL test_filter_pole_stability(epsr,stable)
if (.NOT.stable) then
write(*,*)'Error in cable:',trim(cable_name)
message='Relative permittivity model has unstable pole(s)'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
END SUBROUTINE dielectric_check
!
! NAME
! not_FD_dielectric_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the dielectric model is not frequency dependent as this is a limitation for certain models
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE not_FD_dielectric_check(epsr,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
type(Sfilter),intent(IN) :: epsr
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
logical :: stable
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
! Check that the d.c. relative permittivity is greater than or equal to 1.0
if ( (epsr%a%order.NE.0).OR.(epsr%b%order.NE.0) ) then
write(*,*)'Error in cable:',trim(cable_name)
message='Relative permittivity model is frequency dependent'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
END SUBROUTINE not_FD_dielectric_check
!
! NAME
! transfer impedance_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining transfer impedance are consistent
! the d.c. transfer impedance must be greater than or equal to zero
! the poles of the rational function must be on LHS of the s-plane (time domain stability requirement)
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE transfer_impedance_check(Zt,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
type(Sfilter),intent(IN) :: ZT
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
real(dp) :: Rdc
logical :: stable
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
! Check that the d.c. resistance is greater than or equal to zero
Rdc=ZT%a%coeff(0)/ZT%b%coeff(0)
if (Rdc.LT.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Transfer impedance is less than zero at d.c.'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
! check that the poles of the filter function are in the LHS of the s plane
CALL test_filter_pole_stability(ZT,stable)
if (.NOT.stable) then
write(*,*)'Error in cable:',trim(cable_name)
message='Transfer impedance model has unstable pole(s)'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
END SUBROUTINE transfer_impedance_check
!
! NAME
! conductivity_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the conductivity specified is consistent
! the conductivity specified must be greater than or equal to zero.
! Note that zero conductivity indicates a perfect conductor in this software.
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE conductivity_check(sigma,cable_spec_error,cable_name,message)
USE type_specifications
IMPLICIT NONE
! variables passed to subroutine
real(dp),intent(IN) :: sigma
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
if (sigma.LT.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Conductivity is less than zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
END SUBROUTINE conductivity_check
!
! NAME
! surface_impedance_check
!
! AUTHORS
! Chris Smartt
!
! DESCRIPTION
! check that the parameters defining surface impedance for cylindrical shields are consistent
! The thickness,t , must be greater than or equal to zero on input
! If t=0 then calculate an equivalent thickness such that the surface impedance is equal to the
! transfer impedance at low frequency i.e. make the surface and transfer impedance models consistent
! If t=0 and the conductivity=0 and the transfer impedance at d.c. is not zero then the shield model
! cannot be specified and an error is flagged.
! If the check fails the cable_spec_error flag is set on return, otherwise it is left unchanged
!
! COMMENTS
!
!
! HISTORY
!
! started 28/10/2016 CJS
! 3/8/2017 return with error message
!
!
SUBROUTINE surface_impedance_check(ZT,sigma,rs,t,cable_spec_error,cable_name,message)
USE type_specifications
USE constants
IMPLICIT NONE
! variables passed to subroutine
type(Sfilter) :: ZT
real(dp),intent(INOUT) :: sigma
real(dp),intent(IN) :: rs
real(dp),intent(INOUT) :: t
logical,intent(INOUT) :: cable_spec_error
character(LEN=line_length),intent(IN) :: cable_name
character(LEN=error_message_length),intent(INOUT) :: message
! local variables
real(dp) :: Rdc
! START
if (cable_spec_error) RETURN ! return if an error has already been flagged
CALL conductivity_check(sigma,cable_spec_error,cable_name,message)
if (t.LT.0d0) then
write(*,*)'Error in cable:',trim(cable_name)
message='Shield thickness is less than zero'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
! calculate Rdc, the transfer impedance at d.c.
Rdc=ZT%a%coeff(0)/ZT%b%coeff(0)
! If t=0 then calculate an equivalent thickness such that the surface impedance is equal to the
! transfer impedance at low frequency
if ((t.EQ.0d0).AND.(sigma.NE.0d0)) then
! we need to calculate the thickness to be consistent with the transfer impedance at d.c. i.e. R_dc = ZT_dc
if (Rdc.NE.0d0) then
! calculate the 'equivalent thickness' for the shield
t=1d0/(2d0*pi*rs*sigma*Rdc)
else
! The transfer impedance is zero so set the surface impedance to be zero by setting sigma=0
t=0d0
sigma=0d0
end if
end if
if ((t.EQ.0d0).AND.(sigma.EQ.0d0).AND.(Rdc.GT.small)) then
write(*,*)'Error in cable:',trim(cable_name)
message='Shield conductivity and thickness cannot both be set to zero if there is a non-zero transfer impedance'
write(*,'(A)')trim(message)
cable_spec_error=.TRUE.
RETURN
end if
END SUBROUTINE surface_impedance_check