Re: [Paparazzi-devel] Problems with rotorcraft

[Eduardo lavratti]

With high vibration the rotorcraft will not fly stable and not lock altitude correctly.

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From: address@hidden
To: address@hidden
Date: Wed, 9 Jul 2014 06:34:25 +0000
Subject: Re: [Paparazzi-devel] Problems with rotorcraft

Hi Alonso,
thanks for your answer.
 
I will try that.
 
What is the best way for testing if the autopilot acts to control the attitude? Maybe start with AP_MODE:ATTITDE_DIRECT and then pass to "HOVER" or CF mode?
Is there a standard procedure?
 
Perhaps another problem is a bad vibration isolation of the board?
 
Thanks again! 

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Date: Tue, 8 Jul 2014 22:56:44 -0600
From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] Problems with rotorcraft

maybe you should try the mode  AP_MODE_ATTITUDE_DIRECT, in this mode it does not matter if the barometer works. It is ok to use one battery as long as you are giving the Lisa/M 5V .  You will not get good performance without a barometer in automatic modes. If you have a Aspirin 2.2 then it does have a barometer. Try adding this  <configure name="LISA_M_BARO" value="BARO_MS5611_SPI"/> after <target name="ap" board="lisa_m_2.0">  .  

On Tue, Jul 8, 2014 at 3:29 AM, I. Sánchez Ciarrusta <address@hidden> wrote:

Hi all.

 

I have recently tried to fly a quad (in + configuration) with paparazzi, and it was impossible to fly it.

It was really difficult to control, absolutelly unstable.

In addition, sometimes the PFD got “frozen” (and other times responded with delay), with  no apparent reason.

We tried the hover mode, to observe if the autopilot actuated in every control, but nothing happened.

 

We are using Paparazzi v5.1_devel, LisaM/v2 board with NO barometer, aspirin 2.2 IMU, and ublox LEA-5 GPS.

The accelerometers and magnetometers are well calibrated.

  

Any advice is really appreciated.

 

Maybe is a problem because of not having barometer? Maybe the autopilot and the motors have to be alimented with separate batteries?  I saw some reported problems in the mailing list, but I don´t know exactly how related are with my problem.

 

Thanks in advance.

 

Here is the airframe code we used:

 

<!DOCTYPE airframe SYSTEM "../airframe.dtd">

 

 

 

<airframe name="Quadrotor LisaM_2.0 pwm">

 

  <firmware name="rotorcraft">

    <target name="ap" board="lisa_m_2.0">

      <define name="NO_RC_THRUST_LIMIT"/>

   

      <configure name="AHRS_PROPAGATE_FREQUENCY" value="500"/>

    </target>

 

    <target name="nps" board="pc">

      <subsystem name="fdm" type="jsbsim"/>

      <subsystem name="radio_control" type="ppm"/>  

    </target>

 

    <subsystem name="motor_mixing"/>

    <subsystem name="actuators"     type="pwm">

      <define name="SERVO_HZ" value="400"/>

     

    </subsystem>

 

     <subsystem name="radio_control" type="ppm">       

        <configure name="RADIO_CONTROL_PPM_PIN" value="SERVO6"/>

    </subsystem>

 

     <subsystem name="telemetry"     type="transparent">  

                <configure name="MODEM_BAUD"    value="B57600"/>

                <configure name="MODEM_PORT"    value="UART2"/>

    </subsystem>

 

    <subsystem name="imu"           type="aspirin_v2.2"/>

 

    <subsystem name="gps"           type="ublox">           

                <configure name="GPS_PORT"    value="UART3"/>    

    </subsystem>

    <subsystem name="stabilization" type="int_quat"/>

    <subsystem name="ahrs"          type="int_cmpl_quat">

      <define name="AHRS_GRAVITY_HEURISTIC_FACTOR" value="30"/>

    </subsystem>

    <subsystem name="ins"/> 

 

    <!--define name="KILL_ON_GROUND_DETECT" value="TRUE"/-->

    <define name="TELEMETRY_MODE_FBW" value="1" />

  </firmware>

 

 

  <modules main_freq="512">

 

  <load name="gps_ubx_ucenter.xml">           

                <define name="GPS_UBX_NAV5_DYNAMICS"  value="NAV5_DYN_PEDESTRIAN"/>

               

  </load>

  </modules>

  <servos driver="Pwm">

    <servo name="FRONT"   no="0" min="1000" neutral="1100" max="1900"/>

    <servo name="BACK"    no="1" min="1000" neutral="1100" max="1900"/>

    <servo name="RIGHT"   no="2" min="1000" neutral="1100" max="1900"/>

    <servo name="LEFT"    no="3" min="1000" neutral="1100" max="1900"/>

  </servos>

 

  <commands>

    <axis name="ROLL"   failsafe_value="0"/>

    <axis name="PITCH"  failsafe_value="0"/>

    <axis name="YAW"    failsafe_value="0"/>

    <axis name="THRUST" failsafe_value="0"/>

  </commands>

 

  <section name="MIXING" prefix="MOTOR_MIXING_">

    <define name="TRIM_ROLL" value="0"/>

    <define name="TRIM_PITCH" value="0"/>

    <define name="TRIM_YAW" value="0"/>

    <define name="NB_MOTOR" value="4"/>

    <define name="SCALE" value="256"/>

    <!-- front/back turning CW, right/left CCW -->

    <define name="ROLL_COEF"   value="{    0,    0, -256,  256 }"/>

    <define name="PITCH_COEF"  value="{  256, -256,    0,    0 }"/>

    <define name="YAW_COEF"    value="{ -256, -256,  256,  256 }"/>

    <define name="THRUST_COEF" value="{  256,  256,  256,  256 }"/>

  </section>

 

  <command_laws>

    <call fun="motor_mixing_run(autopilot_motors_on,FALSE,values)"/>

    <set servo="FRONT"  value="motor_mixing.commands[SERVO_FRONT]"/>

    <set servo="BACK"   value="motor_mixing.commands[SERVO_BACK]"/>

    <set servo="RIGHT"  value="motor_mixing.commands[SERVO_RIGHT]"/>

    <set servo="LEFT"   value="motor_mixing.commands[SERVO_LEFT]"/>

  </command_laws>

<!-- inaki he puesto mis valores-->

  <section name="IMU" prefix="IMU_">

   <define name="ACCEL_X_NEUTRAL" value="24"/>

  <define name="ACCEL_Y_NEUTRAL" value="8"/>

  <define name="ACCEL_Z_NEUTRAL" value="264"/>

  <define name="ACCEL_X_SENS" value="4.93314498567" integer="16"/>

  <define name="ACCEL_Y_SENS" value="4.86671471234" integer="16"/>

  <define name="ACCEL_Z_SENS" value="4.86346803582" integer="16"/>

 

    <!-- REEMPLAZADO POR MI CALIBRACION INAKI -->

    <define name="MAG_X_NEUTRAL" value="8"/>

    <define name="MAG_Y_NEUTRAL" value="-12"/>

    <define name="MAG_Z_NEUTRAL" value="35"/>

    <define name="MAG_X_SENS" value="3.53511175627" integer="16"/>

    <define name="MAG_Y_SENS" value="3.49864611794" integer="16"/>

    <define name="MAG_Z_SENS" value="3.96410626337" integer="16"/>

 

    <define name="BODY_TO_IMU_PHI"   value="0." unit="deg"/>

    <define name="BODY_TO_IMU_THETA" value="0." unit="deg"/>

    <define name="BODY_TO_IMU_PSI"   value="0." unit="deg"/>

  </section>

 

  <section name="AHRS" prefix="AHRS_">

    <define name="H_X" value="0.3770441"/>

    <define name="H_Y" value="0.0193986"/>

    <define name="H_Z" value="0.9259921"/>

  </section>

 

  <section name="INS" prefix="INS_">

  </section>

 

  <section name="STABILIZATION_RATE" prefix="STABILIZATION_RATE_">

    <!-- setpoints -->

    <define name="SP_MAX_P" value="10000"/>

    <define name="SP_MAX_Q" value="10000"/>

    <define name="SP_MAX_R" value="10000"/>

    <define name="DEADBAND_P" value="20"/>

    <define name="DEADBAND_Q" value="20"/>

    <define name="DEADBAND_R" value="200"/>

    <define name="REF_TAU" value="4"/>

 

    <!-- feedback -->

    <define name="GAIN_P" value="400"/>

    <define name="GAIN_Q" value="400"/>

    <define name="GAIN_R" value="350"/>

 

    <define name="IGAIN_P" value="75"/>

    <define name="IGAIN_Q" value="75"/>

    <define name="IGAIN_R" value="50"/>

 

    <!-- feedforward -->

    <define name="DDGAIN_P" value="300"/>

    <define name="DDGAIN_Q" value="300"/>

    <define name="DDGAIN_R" value="300"/>

  </section>

 

 

  <section name="STABILIZATION_ATTITUDE" prefix="STABILIZATION_ATTITUDE_">

    <!-- setpoints -->

    <define name="SP_MAX_PHI"     value="45." unit="deg"/>

    <define name="SP_MAX_THETA"   value="45." unit="deg"/>

    <define name="SP_MAX_R"       value="90." unit="deg/s"/>

    <define name="DEADBAND_A"     value="0"/>

    <define name="DEADBAND_E"     value="0"/>

    <define name="DEADBAND_R"     value="250"/>

 

    <!-- reference -->

    <define name="REF_OMEGA_P"  value="400" unit="deg/s"/>  

    <define name="REF_ZETA_P"   value="0.85"/>

    <define name="REF_MAX_P"    value="400." unit="deg/s"/>

    <define name="REF_MAX_PDOT" value="RadOfDeg(8000.)"/>

 

    <define name="REF_OMEGA_Q"  value="400" unit="deg/s"/>

    <define name="REF_ZETA_Q"   value="0.85"/>

    <define name="REF_MAX_Q"    value="400." unit="deg/s"/>

    <define name="REF_MAX_QDOT" value="RadOfDeg(8000.)"/>

 

    <define name="REF_OMEGA_R"  value="250" unit="deg/s"/>

    <define name="REF_ZETA_R"   value="0.85"/>

    <define name="REF_MAX_R"    value="180." unit="deg/s"/>

    <define name="REF_MAX_RDOT" value="RadOfDeg(1800.)"/>

 

    <!-- feedback -->

    <define name="PHI_PGAIN"  value="1000"/>

    <define name="PHI_DGAIN"  value="400"/>

    <define name="PHI_IGAIN"  value="200"/>

 

    <define name="THETA_PGAIN"  value="1000"/>

    <define name="THETA_DGAIN"  value="400"/>

    <define name="THETA_IGAIN"  value="200"/>

 

    <define name="PSI_PGAIN"  value="500"/>

    <define name="PSI_DGAIN"  value="300"/>

    <define name="PSI_IGAIN"  value="10"/>

 

    <!-- feedforward -->

    <define name="PHI_DDGAIN"   value="300"/>

    <define name="THETA_DDGAIN" value="300"/>

    <define name="PSI_DDGAIN"   value="300"/>

  </section>

 

  <section name="GUIDANCE_V" prefix="GUIDANCE_V_">

    <define name="MIN_ERR_Z"   value="POS_BFP_OF_REAL(-10.)"/>

    <define name="MAX_ERR_Z"   value="POS_BFP_OF_REAL( 10.)"/>

    <define name="MIN_ERR_ZD"  value="SPEED_BFP_OF_REAL(-10.)"/>

    <define name="MAX_ERR_ZD"  value="SPEED_BFP_OF_REAL( 10.)"/>

    <define name="MAX_SUM_ERR" value="2000000"/>

    <define name="HOVER_KP"    value="150"/>

    <define name="HOVER_KD"    value="80"/>

    <define name="HOVER_KI"    value="20"/>

    <define name="NOMINAL_HOVER_THROTTLE" value="0.6"/>

    <define name="ADAPT_THROTTLE_ENABLED" value="TRUE"/>

  </section>

 

  <section name="GUIDANCE_H" prefix="GUIDANCE_H_">

    <define name="MAX_BANK" value="20" unit="deg"/>

    <define name="USE_SPEED_REF" value="TRUE"/>

    <define name="PGAIN" value="50"/>

    <define name="DGAIN" value="100"/>

    <define name="AGAIN" value="100"/>

    <define name="IGAIN" value="20"/>

  </section>

 

  <section name="SIMULATOR" prefix="NPS_">

    <define name="ACTUATOR_NAMES"  value="{&quot;front_motor&quot;, &quot;back_motor&quot;, &quot;right_motor&quot;, &quot;left_motor&quot;}"/>

    <define name="JSBSIM_INIT" value="&quot;reset00&quot;"/>

    <define name="JSBSIM_MODEL" value="&quot;simple_quad&quot;"/>

    <define name="SENSORS_PARAMS" value="&quot;nps_sensors_params_default.h&quot;"/>

    <!-- mode switch on joystick channel 5 (axis numbering starting at zero) -->

    <define name="JS_AXIS_MODE" value="4"/>

  </section>

 

  <section name="AUTOPILOT">

   

      <define name="MODE_MANUAL" value="AP_MODE_KILL"/>

      <define name="MODE_AUTO2"  value="AP_MODE_NAV"/>

      <define name="MODE_AUTO1"  value="AP_MODE_RC_DIRECT"/>

 

  </section>

 

  <section name="BAT">

    <define name="CATASTROPHIC_BAT_LEVEL" value="9.3" unit="V"/>

    <define name="CRITIC_BAT_LEVEL" value="9.6" unit="V"/>

    <define name="LOW_BAT_LEVEL" value="10.1" unit="V"/>

    <define name="MAX_BAT_LEVEL" value="12.4" unit="V"/>

    <define name="MILLIAMP_AT_FULL_THROTTLE" value="30000"/>

  </section>

 

</airframe>

 

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