Questions tagged [mobile-robot]
A robot which is capable of moving from one place to another, usually of its own volition.
527
questions
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28 views
feedback linearization controller for a quadrotor
I am trying to develop a controller for a quadrotor using dynamic feedback linearization technique, but I am not sure I am doing thigs correctly. I know that for designing such controller I have to ...
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0answers
5 views
What is the ~tf_prefix parameter does?
I have a TurtleBot3 Robot and when I’m trying to do this command to start the nodes
(The ROBOT is real)
roslaunch turtlebot3_bringup turtlebot3_robot.launch
I’m ...
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0answers
27 views
Old toy robot - anyone remember this? [on hold]
Apologies if this is not the right place, but.... Does anyone know what this toy robot might be?
I was given it years ago when I first started robotics courses, now it has become a favourite with my ...
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1answer
16 views
how to implement a wall following controller for a TurtleBot3? (ROS - python)
I want to implement a wall following controller for my TurtleBot3 (with ROS system).
sensors which I have on the robot: lidar(360) and optional 2 ultrasonic sensors on the side (1 on left and the ...
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1answer
10 views
rtk-gps faster (60Hz) and cheaper?
The below rtk-gps measures position to about 1.5inches
for $1500 and an update rate of 5Hz on gps, and it measures
12.6mm x 4.6mm so that it would easily fit inside of
a 20mm-diameter tube-shaped ...
0
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1answer
39 views
Localize a Mobile Robot on a Mirror
I am currently busy with a project which requires me to construct a robot capable of cleaning a heliostat (movable mirror used to redirect sunlight). Heliostats are basically large flat mirrors that ...
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31 views
Mobile Antenna question
I have a rocket-shaped (tube-shaped) mobile 20mm in diameter. From a base-unit, 600yards away, I want to be able to send two floats (call it x and y) every 1/60th of a second (60Hz data rate [or ...
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3answers
92 views
How to control the velocity of a mobile robot?
I have a differential drive robot whose linear velocity and angular velocity is to be controlled. The current strategy for doing that is:
A high level path tracking module spits out the reference ...
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1answer
64 views
How does it get a bizarre term in triangle law of vector equation in a paper
I am reading the paper "Motion control of wheeled mobile robots"
at page 5, as we have the equation (34.7), i wonder how it contains $− dc(s)\dot s$ in side. As the triangle law of vector: $\vec{OP}=...
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1answer
54 views
What is the cheapest 20mm-diameter roll-angle-sensor (+/-10deg, 60Hz update) you have come across? [closed]
What is the cheapest roll-angle-sensor (10degree accuracy, 60Hz update) you have come across for airborne
mobile robots that have a 20mm diameter, shaped like a rocket? (The robot
is shaped like a ...
0
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1answer
24 views
Does Vehicle Yaw angle measures same at every point on it? If not, how to translate yaw rotation to COG of the vehicle from different point?
I am using an IMU to measure the yaw rotation angle of a car. I need to translate the rotation measured to COG of the vehicle. I can ignore roll and pitch as I am driving it on a flat surface. So, ...
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1answer
51 views
teleop_twist_joy with Logitech F710 Joystick force feedback error
I am using a Logitech F710 joystick game controller in ROS Kinetic Kame. I was able to perform jstest testing, and can see my joystick works well.
But when I try ...
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2answers
52 views
Variables that Improve SLAM
I have a general question regarding SLAM as I am not an expert on the topic. What are the variables that can improve map generation?
The ones I can think of are:
A higher resolution camera
...
2
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2answers
85 views
Why is behavior-based robotics not as popular as deep learning or reinforcement learning?
I am a master student in Germany and one of our professors is doing robotics research but with a different paradigm - the behavior-based robotics based on Subsumption Architecture developed by prof. ...
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6 views
2 NAO robots and a human interacting and exchanging an object
I need to solve the following scenario between 2 NAO robots and one human. Maybe you have advice which NAO accessory or builtin sensor is accurate enough to measure such a distance of 0,5 meters and ...
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1answer
34 views
Plot a map using wheel encoder and IMU data
I want to plot a map( with matplotlib or any other library ) using a wheel encoder and IMU data.
Eg:- For every 10cm robot moves it should draw line (in a graph) and draw angles depending on the data ...
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0answers
23 views
In SLAM loop closure, What does a sim3 matrix do?
I am confused between 3D rigid affine(with scale, without shear) transformation and Lie group's sim(3) matrix.
3D affine would be [sR|t; 0 1].
we rotate, scale and then translate a 3D point using ...
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0answers
17 views
Sampling from guassian distribution for odometry based motion?
I am trying to generate an odometry based motion model as described in the lectures. I have implemented a C++ version of the code. The issue I am having is that when I try to simulate successive ...
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1answer
68 views
Free-floating sphere dynamics using Roy Featherstone's spatial_v2 toolbox
I am using Roy Featherstone's spatial_v2 to model a mobile robot. I encountered a problem so I went back to modeling a free-floating sphere to familiarize myself with the library and the algorithms.
...
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1answer
27 views
How to access raspberry pi over wifi
I have to use raspberry with Arduino on a mobile robot. And access raspberry pi on pc through WiFi. Is it possible? Please explain how to do it.
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4answers
88 views
How to suck using vacuum only first sheet of paper from pack of paper?
We are designing robot that will pick and place sheets of paper. We have found an issue that it is hard to suck only first sheet of paper of paper pack. Issue occurs because paper sheet passes vacuum ...
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1answer
39 views
What robotic skills can I develop when working as a robot operator? [closed]
I find myself very interested to work in the field of robotics though my background is not robotics, I had a degree in Physics, master 1 in Hydrodynamics and this year I have studied just one semester ...
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1answer
36 views
Effect of platform speed (how fast it is moving) on the quality of SLAM
I want to know how big of on an impact does the speed of the platform on which your sensors are mounted have on the quality of the outcome of a SLAM solution. Are there are any methods that are better ...
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1answer
27 views
Path planning with potential field
Can shortest path be computed using potential field path planning algorithm? Or is it just for obstacle avoidance and navigative towards goal? As i studied potential field deals with attracrive/...
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22 views
D* path planning
I am studying D* path planning algorithm. It includes RAISE state and Lower state.
I studied many paper on D* and got to know that RAISE state k(X) h(X) + c(X,Y)) then
insert X into the OPEN list ...
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2answers
53 views
Mapping of dynamic environment
I want to do path planning in dynamic environment in which obstacles keep changing. Could you suggest me good path planning algorithm for this? . Is D* algorithm suitable for me to achieve this in ...
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1answer
36 views
Mapping of unknown environment
My question is how do obtain occupancy grid map given sensor data of a robot? . I searched a lot and concluded that by using proximity sensors (rangefinders, sonar) and putting that data in occupancy ...
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0answers
31 views
ROS packages for *pre-planned* path navigation rather than path generation? (Turtlebot3/ROS)
I am working on a project in which users will create paths fully constrained in terms of position (using a separate piece of software), and a robot will periodically follow those paths. We are using a ...
4
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1answer
47 views
Multiple machine ROS image transmission error
I'm currently trying to establish communication between my Raspberry Pi based robot and a Cluster which are on the same network. Although I am able to ping and SSH one device using the other, I'm ...
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0answers
35 views
Multi robot exploration
I am implementing 2d slam for multi-robot exploration for my university project using GMapping package of a ROS and vrep sofrware. But I also have to implement the following three algorithms in ...
2
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1answer
70 views
How to build map for unknown environment? [closed]
In order to create a map for unknown environment, we have two solutions:
The size of the area should be given (grid-based maps) so simply we create 2D grid and have our robot to move discrete ...
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0answers
17 views
Trajectory tracking problem for non-holonomic mobile robots
Currently, I am working on the trajectory tracking problems of autonomous ground vehicle and a little confused about the applicability of control theory for different types of wheeled mobile robots.
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1answer
47 views
EKF SLAM : SLAM specific Jacobians for new landmarks
I am currently trying to understand the books SLAM for dummies and Simulataneous localization and mapping
with the extended Kalman filter to implement slam. I have understood steps 1 and 2 SLAM for ...
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0answers
13 views
There is an error when i use kinect v1 with Mrpt tool
when i use mrpt tool to calibrate kinect v1, there is an error:
...
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2answers
54 views
Multiple robots performing a set of tasks (Optimization)
Consider a situation where you have a 'm' number of robots and 'n' number of tasks. Each task is at a different location. What optimization algorithm should I use in order to assign a set of tasks to ...
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0answers
19 views
RpLIDAR unable to see black objects
I am working on a ROSBOT for a natural navigation project.
While working with RpLIDAR A2 version, I found that it does not sense thin black surfaces like black pants/trousers while at close range (...
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2answers
33 views
Lifting robot that moves like a plotter
I'm looking for what a robot that moves like a plotter but can grab a load up to 1kg with a claw, lift, rotate and place in another location within its range. What is this type of robot called?
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14 views
How to perform system identification of a mobile robot using white box approach?
Why isn't there much research going into the extraction of inertial and frictional values?
Is there any standardized approach?
Edit:
I will give a sample application! Say if we want to implement a ...
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2answers
39 views
Free Multibody Dynamics Software?
I'm working on modelling a feller buncher, its end effector consists of a saw to cut trees and claws to bundle them together. I'm looking for a free/open source software that can simulate dynamics of ...
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1answer
26 views
Does anyone have documentation for a CoroWare Explorer?
I have inherited a CoroWare Explorer from someone who used it for their PhD research years ago. They have no documentation on the robot, and I cannot find any online. Does anyone have a user's manual ...
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2answers
60 views
Electronic Speed Controller
What should be the specification of ESC that I should use for a 320KV 1820W brushless DC Motor?. Is it necessary to use an 80A ESC?, Basically, How can I choose the required ESC for a motor?
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1answer
55 views
Autonomous Navigation Bot [duplicate]
I'm trying to build an Autonomous parcel delivering rover using GPS.So after giving destination coordinates, I don't know how to make the robot understand to which direction it should move. Basically, ...
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3answers
188 views
Do I need a camera along with LIDAR for SLAM?
Equipment:
Pi 3 B
Mega
2x Encoder Motor 12VDC 299RPM
MPU 6050
12V bat 2000mAh
LIDAR or Kinect ?
I want to implement EKF SLAM. I have referred bot NOX ROS wandering robot, Hussarian CORE and Robotics ...
0
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0answers
31 views
Robot trajectory generation; path-paramerization
I have a differential drive robot, and it's supposed to drive on a parabolic function $(f(x) = x^2)$. But for all control algorithms, you have a trajectory given as $f(s)$ or $f(t)$.
I want to use ...
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0answers
17 views
How to do mechanical calculations for a towing robot?
I am making an automated guided vehicle
AGV will tow standard shopping carts each will weighs 20-30kg
I hope to use 12V DC gear motors 100rpm torque 20kg.cm
(assume the floor is smooth and flat)
I ...
0
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1answer
51 views
What is the difference between the pose of a robot and the configuration of a robot?
Do "configuration" and "pose" means the same thing? If not what is the difference?
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2answers
233 views
IMU and encoder fusion
I'm trying to simulate data fusion for a 4-wheeled mobile robot using ekf and am using IMU and wheel encoders as sensors,where IMU measures linear acceleration and angular velocity and encoder ...
3
votes
1answer
59 views
High power jumping mechanism in small robots
I recently saw this video on YouTube featuring a jumping robot: 5 Fastest Robots In The World
I was curious how this is accomplished mechanically? Do they wind a strong spring or use some sort of air ...
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1answer
31 views
How can robots communicate, locate and identify each other?
I'm planning to build some simple robotic boats. They will be travelling some distance alone but should also be able to group and physically connect together to form one boat. When they are near each ...
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1answer
41 views
What is the best adaptive controller for robotic arms?
I have a question that lays on practical experience. What is the best adaptive controller for a robotic arm?
Self Tuning Regulator (STR)
Model Reference Adaptive Controller (MARC)
Adaptive Model ...
