resonance_tester: Resonance testing and input shaper auto-calibration (#3381)

Signed-off-by: Dmitry Butyugin <dmbutyugin@google.com>

scripts/calibrate_shaper.py

@@ -0,0 +1,166 @@
+#!/usr/bin/env python2
+# Shaper auto-calibration script
+#
+# Copyright (C) 2020  Dmitry Butyugin <dmbutyugin@google.com>
+# Copyright (C) 2020  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+from __future__ import print_function
+import optparse, os, sys
+import numpy as np, matplotlib
+sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                             '..', 'klippy', 'extras'))
+from shaper_calibrate import CalibrationData, ShaperCalibrate
+
+def parse_log(logname):
+    with open(logname) as f:
+        for header in f:
+            if not header.startswith('#'):
+                break
+        if not header.startswith('freq,psd_x,psd_y,psd_z,psd_xyz'):
+            # Raw accelerometer data
+            return np.loadtxt(logname, comments='#', delimiter=',')
+    # Parse power spectral density data
+    data = np.loadtxt(logname, skiprows=1, comments='#', delimiter=',')
+    calibration_data = CalibrationData(
+            freq_bins=data[:,0], psd_sum=data[:,4],
+            psd_x=data[:,1], psd_y=data[:,2], psd_z=data[:,3])
+    calibration_data.set_numpy(np)
+    # If input shapers are present in the CSV file, the frequency
+    # response is already normalized to input frequencies
+    if 'mzv' not in header:
+        calibration_data.normalize_to_frequencies()
+    return calibration_data
+
+######################################################################
+# Shaper calibration
+######################################################################
+
+# Find the best shaper parameters
+def calibrate_shaper(datas, csv_output):
+    helper = ShaperCalibrate(printer=None)
+    if isinstance(datas[0], CalibrationData):
+        calibration_data = datas[0]
+        for data in datas[1:]:
+            calibration_data.join(data)
+    else:
+        # Process accelerometer data
+        calibration_data = helper.process_accelerometer_data(datas[0])
+        for data in datas[1:]:
+            calibration_data.join(helper.process_accelerometer_data(data))
+        calibration_data.normalize_to_frequencies()
+    shaper_name, shaper_freq, shapers_vals = helper.find_best_shaper(
+            calibration_data, print)
+    print("Recommended shaper is %s @ %.1f Hz" % (shaper_name, shaper_freq))
+    if csv_output is not None:
+        helper.save_calibration_data(
+                csv_output, calibration_data, shapers_vals)
+    return shaper_name, shapers_vals, calibration_data
+
+######################################################################
+# Plot frequency response and suggested input shapers
+######################################################################
+
+def plot_freq_response(calibration_data, shapers_vals,
+                       selected_shaper, max_freq):
+    freqs = calibration_data.freq_bins
+    psd = calibration_data.psd_sum[freqs <= max_freq]
+    px = calibration_data.psd_x[freqs <= max_freq]
+    py = calibration_data.psd_y[freqs <= max_freq]
+    pz = calibration_data.psd_z[freqs <= max_freq]
+    freqs = freqs[freqs <= max_freq]
+
+    fontP = matplotlib.font_manager.FontProperties()
+    fontP.set_size('x-small')
+
+    fig, ax = matplotlib.pyplot.subplots()
+    ax.set_xlabel('Frequency, Hz')
+    ax.set_xlim([0, max_freq])
+    ax.set_ylabel('Power spectral density')
+
+    ax.plot(freqs, psd, label='X+Y+Z', color='purple')
+    ax.plot(freqs, px, label='X', color='red')
+    ax.plot(freqs, py, label='Y', color='green')
+    ax.plot(freqs, pz, label='Z', color='blue')
+
+    if shapers_vals:
+        ax.set_title("Frequency response and shapers")
+    else:
+        ax.set_title("Frequency response")
+    ax.xaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
+    ax.yaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
+    ax.xaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
+    ax.yaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
+    ax.ticklabel_format(axis='y', style='scientific', scilimits=(0,0))
+    ax.grid(which='major', color='grey')
+    ax.grid(which='minor', color='lightgrey')
+    ax.legend(loc='upper right', prop=fontP)
+
+    if shapers_vals:
+        ax2 = ax.twinx()
+        ax2.set_ylabel('Shaper vibration reduction (ratio)')
+        best_shaper_vals = None
+        for name, freq, vals in shapers_vals:
+            label = "%s (%.1f Hz)" % (name.upper(), freq)
+            linestyle = 'dotted'
+            if name == selected_shaper:
+                label += ' (selected)'
+                linestyle = 'dashdot'
+                best_shaper_vals = vals
+            ax2.plot(freqs, vals, label=label, linestyle=linestyle)
+        ax.plot(freqs, psd * best_shaper_vals,
+                label='After\nshaper', color='cyan')
+        ax2.legend(loc='upper left', prop=fontP)
+
+    fig.tight_layout()
+    return fig
+
+######################################################################
+# Startup
+######################################################################
+
+def setup_matplotlib(output_to_file):
+    global matplotlib
+    if output_to_file:
+        matplotlib.rcParams.update({'figure.autolayout': True})
+        matplotlib.use('Agg')
+    import matplotlib.pyplot, matplotlib.dates, matplotlib.font_manager
+    import matplotlib.ticker
+
+def main():
+    # Parse command-line arguments
+    usage = "%prog [options] <logs>"
+    opts = optparse.OptionParser(usage)
+    opts.add_option("-o", "--output", type="string", dest="output",
+                    default=None, help="filename of output graph")
+    opts.add_option("-c", "--csv", type="string", dest="csv",
+                    default=None, help="filename of output csv file")
+    opts.add_option("-f", "--max_freq", type="float", default=200.,
+                    help="maximum frequency to graph")
+    options, args = opts.parse_args()
+    if len(args) < 1:
+        opts.error("Incorrect number of arguments")
+
+    # Parse data
+    datas = [parse_log(fn) for fn in args]
+
+    # Calibrate shaper and generate outputs
+    selected_shaper, shapers_vals, calibration_data = calibrate_shaper(
+            datas, options.csv)
+
+    if not options.csv or options.output:
+        # Draw graph
+        setup_matplotlib(options.output is not None)
+
+        fig = plot_freq_response(calibration_data, shapers_vals,
+                                 selected_shaper, options.max_freq)
+
+        # Show graph
+        if options.output is None:
+            matplotlib.pyplot.show()
+        else:
+            fig.set_size_inches(8, 6)
+            fig.savefig(options.output)
+
+if __name__ == '__main__':
+    main()