Interpolated spectrum
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2 changed files with 13 additions and 3 deletions
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@ -8,6 +8,7 @@ psize=Psize.dat
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raw_ts=cerema/raw/201702281700.raw,cerema/raw/201702281730.raw
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raw_spec=cerema/spt/201702281715.spt
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hires_step=0.5
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cycle=14400
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[out]
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margin=0.005
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@ -5,6 +5,7 @@ import pathlib
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import matplotlib.pyplot as plt
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import numpy as np
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from scipy.interpolate import griddata
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parser = argparse.ArgumentParser(description="Pre-process time-series")
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parser.add_argument("-v", "--verbose", action="count", default=0)
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@ -39,16 +40,24 @@ inp = np.loadtxt(
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max_rows=64,
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)
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cycle = config.getfloat("inp", "cycle", fallback=None)
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if cycle is None:
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f = inp["f"]
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S = inp["S"] * Sm
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else:
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f = np.arange(inp["f"].min(), inp["f"].max() + 1/cycle, 1/cycle)
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S = griddata(inp["f"], inp["S"] * Sm, f)
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with out_spec.open("w") as out:
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out.write("SPEC1D\n")
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np.savetxt(out, np.stack((inp["f"], inp["S"] * Sm), axis=1))
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np.savetxt(out, np.stack((f, S), axis=1))
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df = np.diff(inp['f']).min()
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df = np.diff(f).min()
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log.info(f"Minimum frequency delta: {df:.4f}Hz")
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log.info(f"Maximum modelled time: {1/df:.0f}s")
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fig, ax = plt.subplots()
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ax.plot(inp["f"], inp["S"]*Sm, c="k", lw=1)
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ax.plot(f, S, c="k", lw=1)
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ax.autoscale(True, "x", tight=True)
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ax.grid()
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ax.set(xlim=0, ylim=0, xlabel="f (Hz)", ylabel="S (m^2/Hz)")
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