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improved vibration speed range and fixed zeta estimation crash

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This commit is contained in:
Félix Boisselier
2024-04-02 10:48:01 +02:00
parent 4297aef0f5
commit 83588029f1
3 changed files with 57 additions and 32 deletions
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17
K-ShakeTune/scripts/common_func.py
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@@ -78,16 +78,23 @@ def compute_mechanical_parameters(psd, freqs):
max_power = psd[max_power_index]
half_power = max_power / math.sqrt(2)
idx_below = np.where(psd[:max_power_index] <= half_power)[0][-1]
idx_above = np.where(psd[max_power_index:] <= half_power)[0][0] + max_power_index
indices_below = np.where(psd[:max_power_index] <= half_power)[0]
indices_above = np.where(psd[max_power_index:] <= half_power)[0]
if len(indices_below) == 0 or len(indices_above) == 0:
# If we are not able to find points around the half power, we can't compute the damping ratio and return None instead
return fr, None, max_power_index
idx_below = indices_below[-1]
idx_above = indices_above[0] + max_power_index
freq_below_half_power = freqs[idx_below] + (half_power - psd[idx_below]) * (freqs[idx_below + 1] - freqs[idx_below]) / (psd[idx_below + 1] - psd[idx_below])
freq_above_half_power = freqs[idx_above - 1] + (half_power - psd[idx_above - 1]) * (freqs[idx_above] - freqs[idx_above - 1]) / (psd[idx_above] - psd[idx_above - 1])
bandwidth = freq_above_half_power - freq_below_half_power
bw1 = math.pow(bandwidth/fr,2)
bw2 = math.pow(bandwidth/fr,4)
bw1 = math.pow(bandwidth/fr, 2)
bw2 = math.pow(bandwidth/fr, 4)
zeta = math.sqrt(0.5-math.sqrt(1/(4+4*bw1-bw2)))
zeta = math.sqrt(0.5 - math.sqrt(1 / (4 + 4 * bw1 - bw2)))
return fr, zeta, max_power_index