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Diffstat (limited to 'src/modules/bottle_drop/bottle_drop_params.c')
-rw-r--r-- | src/modules/bottle_drop/bottle_drop_params.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/modules/bottle_drop/bottle_drop_params.c b/src/modules/bottle_drop/bottle_drop_params.c new file mode 100644 index 000000000..51ebfb9a1 --- /dev/null +++ b/src/modules/bottle_drop/bottle_drop_params.c @@ -0,0 +1,131 @@ +/**************************************************************************** + * + * Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name PX4 nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/** + * @file bottle_drop_params.c + * Bottle drop parameters + * + * @author Dominik Juchli <juchlid@ethz.ch> + */ + +#include <nuttx/config.h> +#include <systemlib/param/param.h> + +/** + * Ground drag property + * + * This parameter encodes the ground drag coefficient and the corresponding + * decrease in wind speed from the plane altitude to ground altitude. + * + * @unit unknown + * @min 0.001 + * @max 0.1 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_GPROPERTIES, 0.03f); + +/** + * Plane turn radius + * + * The planes known minimal turn radius - use a higher value + * to make the plane maneuver more distant from the actual drop + * position. This is to ensure the wings are level during the drop. + * + * @unit meter + * @min 30.0 + * @max 500.0 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_TURNRADIUS, 120.0f); + +/** + * Drop precision + * + * If the system is closer than this distance on passing over the + * drop position, it will release the payload. This is a safeguard + * to prevent a drop out of the required accuracy. + * + * @unit meter + * @min 1.0 + * @max 80.0 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_PRECISION, 30.0f); + +/** + * Payload drag coefficient of the dropped object + * + * The drag coefficient (cd) is the typical drag + * constant for air. It is in general object specific, + * but the closest primitive shape to the actual object + * should give good results: + * http://en.wikipedia.org/wiki/Drag_coefficient + * + * @unit meter + * @min 0.08 + * @max 1.5 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_OBJ_CD, 0.1f); + +/** + * Payload mass + * + * A typical small toy ball: + * 0.025 kg + * + * OBC water bottle: + * 0.6 kg + * + * @unit kilogram + * @min 0.001 + * @max 5.0 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_OBJ_MASS, 0.6f); + +/** + * Payload front surface area + * + * A typical small toy ball: + * (0.045 * 0.045) / 4.0 * pi = 0.001590 m^2 + * + * OBC water bottle: + * (0.063 * 0.063) / 4.0 * pi = 0.003117 m^2 + * + * @unit m^2 + * @min 0.001 + * @max 0.5 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_OBJ_SURFACE, 0.00311724531f); |