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tprint critical damping value - sphere - GPU-based 3D discrete element method a… |
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git clone git://src.adamsgaard.dk/sphere |
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--- |
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commit 2f797ca42a01f9ba8b1a0b796f1a2d401fd93cb8 |
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parent 2244613a995b06519bf113d6b2da83275e3e33e6 |
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Author: Anders Damsgaard <[email protected]> |
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Date: Tue, 30 Sep 2014 10:04:23 +0200 |
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print critical damping value |
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Diffstat: |
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M python/halfshear-starter.py | 2 ++ |
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M python/sphere.py | 15 ++++++++++----- |
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2 files changed, 12 insertions(+), 5 deletions(-) |
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--- |
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diff --git a/python/halfshear-starter.py b/python/halfshear-starter.py |
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t@@ -50,6 +50,8 @@ sim.w_devs[0] = sigma0 |
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#sim.w_m[0] = numpy.abs(sigma0*sim.L[0]*sim.L[1]/sim.g[2]) |
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sim.mu_s[0] = 0.5 |
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sim.mu_d[0] = 0.5 |
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+sim.setDampingNormal(0.0) |
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+sim.setDampingTangential(0.0) |
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# Fix lowermost particles |
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dz = sim.L[2]/sim.num[2] |
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diff --git a/python/sphere.py b/python/sphere.py |
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t@@ -2885,23 +2885,28 @@ class sim: |
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See also: :func:`setDampingTangential(gamma)` |
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''' |
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self.gamma_n[0] = gamma |
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- damping_ratio = gamma/(2.0*numpy.sqrt(self.smallestMass()*self.k_n[0])) |
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+ critical_gamma = 2.0*numpy.sqrt(self.smallestMass()*self.k_n[0]) |
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+ damping_ratio = gamma/critical_gamma |
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if (damping_ratio < 1.0): |
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print('Info: The system is under-dampened (ratio = ' |
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+ str(damping_ratio) |
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- + ') in the normal component. This is ok.') |
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+ + ') in the normal component. Critical damping = ' |
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+ + str(critical_gamma) + '. This is ok.') |
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elif (damping_ratio > 1.0): |
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if over_damping: |
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print('Warning: The system is over-dampened (ratio = ' |
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- + str(damping_ratio) + ') in the normal component.') |
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+ + str(damping_ratio) + ') in the normal component. ' |
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+ + 'Critical damping = ' + str(critical_gamma) + '.') |
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else: |
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raise Exception('Warning: The system is over-dampened (ratio =… |
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+ str(damping_ratio) + ') in the normal component.\n' |
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+ 'Call this function once more with `over_damping=True`… |
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- + 'if this is what you want.') |
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+ + 'if this is what you want. Critical damping = ' |
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+ + str(critical_gamma) + '.') |
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else: |
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print('Warning: The system is critically dampened (ratio = ' |
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- + str(damping_ratio) + ') in the normal component.') |
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+ + str(damping_ratio) + ') in the normal component. ' |
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+ + 'Critical damping = ' + str(critical_gamma) + '.') |
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def setDampingTangential(self, gamma, over_damping=False): |
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''' |
