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Blackbox shows a lot of noise in D
#1
I've been trying to tune my QAV-R both practically and using Blackbox, but I've been having a hard time eliminating high-frequency noise in my D. I'm quite new to drones (so I may be quite ignorant), but I think the quad flies great. It's very predictable and nimble, but I've heard that excess D activity can ruin motors, so the blackbox data is worrisome. 

I was thinking about experimenting with D-term Filtering, but I figured I'd ask the internet first.

Relevant Hardware:
  • 5" QAV-R
  • 3S 1500mah and 1300 mah batteries
  • HQ 5x4x3 props (I found a SMALL crack in one of the blades after I made this blackbox log, but the noise was present on other logs created with perfect props.)
  • Naze32 Rev6 FC running BetaFlight 2.9.1 (Noise was also present with 2.9.0 and 2.8.X)
  • OSDoge 1.5
  • DYS 1806 2300 kv motors
  • DYS 20a ESCs running latest BLHeli
Blackbox Log: https://www.dropbox.com/s/kfb9pqsokl0sdi...4.TXT?dl=0

CLI Dump:

Code:
# Dump

# version
# BetaFlight/NAZE 2.9.1 Aug  2 2016 / 22:47:45 (0ef6c3d)
# dump master

# mixer
mixer QUADX
mmix reset
smix reset


# feature
feature -RX_PPM
feature -VBAT
feature -INFLIGHT_ACC_CAL
feature -RX_SERIAL
feature -MOTOR_STOP
feature -SERVO_TILT
feature -SOFTSERIAL
feature -GPS
feature -FAILSAFE
feature -SONAR
feature -TELEMETRY
feature -CURRENT_METER
feature -3D
feature -RX_PARALLEL_PWM
feature -RX_MSP
feature -RSSI_ADC
feature -LED_STRIP
feature -DISPLAY
feature -ONESHOT125
feature -BLACKBOX
feature -CHANNEL_FORWARDING
feature -TRANSPONDER
feature -AIRMODE
feature -SUPEREXPO_RATES
feature RX_PPM
feature VBAT
feature MOTOR_STOP
feature FAILSAFE
feature TELEMETRY
feature ONESHOT125
feature BLACKBOX
feature SUPEREXPO_RATES


# beeper
beeper GYRO_CALIBRATED
beeper RX_LOST
beeper RX_LOST_LANDING
beeper DISARMING
beeper ARMING
beeper ARMING_GPS_FIX
beeper BAT_CRIT_LOW
beeper BAT_LOW
beeper GPS_STATUS
beeper RX_SET
beeper ACC_CALIBRATION
beeper ACC_CALIBRATION_FAIL
beeper READY_BEEP
beeper MULTI_BEEPS
beeper DISARM_REPEAT
beeper ARMED
beeper SYSTEM_INIT
beeper ON_USB


# map
map TAER1234


# serial
serial 0 1 115200 57600 0 115200
serial 1 0 115200 57600 0 115200


# led
led 0 15,15:ES:IA:0
led 1 15,8:E:WF:0
led 2 15,7:E:WF:0
led 3 15,0:NE:IA:0
led 4 8,0:N:F:0
led 5 7,0:N:F:0
led 6 0,0:NW:IA:0
led 7 0,7:W:WF:0
led 8 0,8:W:WF:0
led 9 0,15:SW:IA:0
led 10 7,15:S:WF:0
led 11 8,15:S:WF:0
led 12 7,7:U:WF:0
led 13 8,7:U:WF:0
led 14 7,8:D:WF:0
led 15 8,8:D:WF:0
led 16 8,9::R:3
led 17 9,10::R:3
led 18 10,11::R:3
led 19 10,12::R:3
led 20 9,13::R:3
led 21 8,14::R:3
led 22 7,14::R:3
led 23 6,13::R:3
led 24 5,12::R:3
led 25 5,11::R:3
led 26 6,10::R:3
led 27 7,9::R:3
led 28 0,0:::0
led 29 0,0:::0
led 30 0,0:::0
led 31 0,0:::0


# color
color 0 0,0,0
color 1 0,255,255
color 2 0,0,255
color 3 30,0,255
color 4 60,0,255
color 5 90,0,255
color 6 120,0,255
color 7 150,0,255
color 8 180,0,255
color 9 210,0,255
color 10 240,0,255
color 11 270,0,255
color 12 300,0,255
color 13 330,0,255
color 14 0,0,0
color 15 0,0,0

# aux
aux 0 0 1 900 1600
aux 1 1 0 1900 2100
aux 2 2 0 1400 1600
aux 3 27 1 900 1100
aux 4 12 2 1900 2100
aux 5 25 2 900 1100
aux 6 0 0 900 900
aux 7 0 0 900 900
aux 8 0 0 900 900
aux 9 0 0 900 900
aux 10 0 0 900 900
aux 11 0 0 900 900
aux 12 0 0 900 900
aux 13 0 0 900 900
aux 14 0 0 900 900
aux 15 0 0 900 900
aux 16 0 0 900 900
aux 17 0 0 900 900
aux 18 0 0 900 900
aux 19 0 0 900 900

# adjrange
adjrange 0 0 0 900 900 0 0
adjrange 1 0 0 900 900 0 0
adjrange 2 0 0 900 900 0 0
adjrange 3 0 0 900 900 0 0
adjrange 4 0 0 900 900 0 0
adjrange 5 0 0 900 900 0 0
adjrange 6 0 0 900 900 0 0
adjrange 7 0 0 900 900 0 0
adjrange 8 0 0 900 900 0 0
adjrange 9 0 0 900 900 0 0
adjrange 10 0 0 900 900 0 0
adjrange 11 0 0 900 900 0 0
adjrange 12 0 0 900 900 0 0
adjrange 13 0 0 900 900 0 0
adjrange 14 0 0 900 900 0 0

# rxrange
rxrange 0 1000 2000
rxrange 1 1000 2000
rxrange 2 1000 2000
rxrange 3 1000 2000

# servo
servo 0 1000 2000 1500 90 90 100 -1
servo 1 1000 2000 1500 90 90 100 -1
servo 2 1000 2000 1500 90 90 100 -1
servo 3 1000 2000 1500 90 90 100 -1
servo 4 1000 2000 1500 90 90 100 -1
servo 5 1000 2000 1500 90 90 100 -1
servo 6 1000 2000 1500 90 90 100 -1
servo 7 1000 2000 1500 90 90 100 -1

set mid_rc = 1500
set min_check = 1100
set max_check = 1900
set rssi_channel = 8
set rssi_scale = 30
set rc_smooth_interval_ms = 0
set rssi_ppm_invert = OFF
set input_filtering_mode = OFF
set roll_yaw_cam_mix_degrees = 0
set max_aux_channels = 6
set debug_mode = NONE
set min_throttle = 1050
set max_throttle = 1980
set min_command = 1000
set anti_desync_power_step = 0
set servo_center_pulse = 1500
set 3d_deadband_low = 1406
set 3d_deadband_high = 1514
set 3d_neutral = 1460
set 3d_deadband_throttle = 50
set unsynced_fast_pwm = OFF
set fast_pwm_protocol = ONESHOT125
set motor_pwm_rate = 400
set servo_pwm_rate = 50
set disarm_kill_switch = ON
set gyro_cal_on_first_arm = OFF
set auto_disarm_delay = 5
set small_angle = 25
set fixedwing_althold_dir = 1
set reboot_character = 82
set serialrx_provider = SBUS
set sbus_inversion = ON
set spektrum_sat_bind = 0
set spektrum_sat_bind_autoreset = 1
set telemetry_switch = OFF
set telemetry_inversion = OFF
set frsky_default_lattitude =  0.000
set frsky_default_longitude =  0.000
set frsky_coordinates_format = 0
set frsky_unit = IMPERIAL
set frsky_vfas_precision = 0
set frsky_vfas_cell_voltage = OFF
set hott_alarm_sound_interval = 5
set battery_capacity = 0
set vbat_scale = 113
set vbat_max_cell_voltage = 42
set vbat_min_cell_voltage = 35
set vbat_warning_cell_voltage = 36
set vbat_hysteresis = 1
set vbat_pid_compensation = ON
set current_meter_scale = 400
set current_meter_offset = 0
set multiwii_current_meter_output = OFF
set current_meter_type = ADC
set align_gyro = DEFAULT
set align_acc = DEFAULT
set align_mag = DEFAULT
set align_board_roll = 0
set align_board_pitch = 0
set align_board_yaw = 180
set max_angle_inclination = 700
set gyro_lpf = OFF
set gyro_sync_denom = 8
set gyro_lowpass = 100
set moron_threshold = 32
set imu_dcm_kp = 2500
set imu_dcm_ki = 0
set alt_hold_deadband = 40
set alt_hold_fast_change = ON
set deadband = 0
set yaw_deadband = 0
set throttle_correction_value = 0
set throttle_correction_angle = 800
set yaw_control_direction = 1
set yaw_motor_direction = 1
set tri_unarmed_servo = ON
set servo_lowpass_freq = 400
set servo_lowpass_enable = OFF
set airmode_activate_throttle = 1350
set failsafe_delay = 10
set failsafe_off_delay = 30
set failsafe_throttle = 1250
set failsafe_kill_switch = OFF
set failsafe_throttle_low_delay = 100
set failsafe_procedure = ON
set rx_min_usec = 885
set rx_max_usec = 2115
set gimbal_mode = NORMAL
set acc_hardware = AUTO
set acc_lpf_hz =  10.000
set accxy_deadband = 40
set accz_deadband = 40
set acc_unarmedcal = ON
set acc_trim_pitch = 0
set acc_trim_roll = 0
set baro_tab_size = 21
set baro_noise_lpf =  0.600
set baro_cf_vel =  0.985
set baro_cf_alt =  0.965
set baro_hardware = AUTO
set mag_hardware = NONE
set mag_declination = 0
set pid_process_denom = 1
set blackbox_rate_num = 1
set blackbox_rate_denom = 1
set blackbox_device = SPIFLASH
set magzero_x = 0
set magzero_y = 0
set magzero_z = 0
set ledstrip_visual_beeper = OFF

# rxfail
rxfail 0 a
rxfail 1 a
rxfail 2 a
rxfail 3 a
rxfail 4 h
rxfail 5 h
rxfail 6 h
rxfail 7 h
rxfail 8 h
rxfail 9 h
rxfail 10 h
rxfail 11 h
rxfail 12 h
rxfail 13 h
rxfail 14 h
rxfail 15 h
rxfail 16 h
rxfail 17 h

# profile
profile 0
############################# PROFILE VALUES ####################################

set pid_delta_method = MEASUREMENT
set yaw_p_limit = 500
set dterm_lowpass = 100
set dynamic_iterm = ON
set iterm_ignore_threshold = 180
set yaw_iterm_ignore_threshold = 35
set yaw_lowpass = 80
set pid_controller = INT
set p_pitch = 60
set i_pitch = 55
set d_pitch = 18
set p_roll = 55
set i_roll = 55
set d_roll = 18
set p_yaw = 85
set i_yaw = 55
set d_yaw = 5
set p_alt = 50
set i_alt = 0
set d_alt = 0
set p_level = 50
set i_level = 50
set d_level = 100
set p_vel = 55
set i_vel = 55
set d_vel = 75
rateprofile 0

# rateprofile
rateprofile 0

set rc_rate = 100
set rc_rate_yaw = 100
set rc_expo = 0
set rc_yaw_expo = 0
set thr_mid = 50
set thr_expo = 0
set roll_rate = 65
set pitch_rate = 65
set yaw_rate = 65
set tpa_rate = 0
set tpa_breakpoint = 1650

#
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#2
Oddly enough, the D seems to be pretty inactive other than the noise. Would increasing D intensify the noise?
Reply
#3
to reduce D noise, set "dterm_lowpass" lower, currently is 100, maybe try 60?
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
Reply
#4
The easiest way to check if D-term noise is causing a problem for your motors is to take a flight and feel the temperature of the motors when you land. if they are not very hot, it shouldn't be any problem
Reply


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