18
Technik und Sensorien (Subject) / McCool 1 (Lesson)
Motivation PA
This lesson was created by Nora1994.
This lesson is not released for learning.
Advertisement
- Motivation of PA Agro chemicals -> water pollution, declining biodervisity, herbicide resistance limited natural resources and land -> nutrients, water climate change
- control traffic farming 1. run heavy machininery in track -> less soil compaction -> better yield -> well designed farm layout 2. standartisation of equipment annd field layout -> requires GNSS -> weel cenrte -> spry boom
- variable rate application aplly diferent amount of fertilizer at different parts site specific management Apllication type and applicatin sensor/map
- application type what action are we taking on the field -> variavle speed seeding -> varibale rate weed control -> variable reed fertilizer
- application sensor/map tells us how to take the action -> generally action in always taken it is usually informing the system whether to aplly more or less -> pre defined map -> on the fly using sensors -> cpmbining pre defined maps with on the fly sensors
- what can we achieve with sensors and technology? - Automation works well in structured evironment -> programmed where to go -> can't cope with change - sensors allow us to make better sense of our environment -vison is an impressive sense -> we can see close far -> see shapes, texture, colour and movement -> cameras are lightweight, ubiquitous and cheap
- what is a robot? elctro mechanical system that can interact with the world has some levels of automation -> remote control: execute a range of actions based on input from external source -> artificial intelligence: interact with evironment on their own -> hybrid. mix of two
- what's the physical design of a robot? Actuators -> enables the robot to interact with teh envrironment (Motor to move the weel) Physical Component-> way the robot interact with environment is often noisy or imperfact Environment->environment that the robot operates within (weather conditions and wind factor Sensor ->allow the robot to understand the evironment that it is operating in Computer controller-> way that the robot processes the information coming in from the sensor
- how do we define the robot? electro-mechanical systems-> actuators environment in which it operates tasks that it needs to undertake sesnsors that it uses
- what specifications do we need to design a robot? singe function specifications operational specifications technical specifications
- Advertisement
- what are the singe function specifications? autonomous movement navigate trough the field saftey spraying with herbicide lightweight sensing to detect and classify plants energy efficient alternative method for weeding
- operational specifications muts be transportable bewteen the fields using standart machidnery must be able to shutdown operation and stop the machine if it's close to a human map of the field with the herbicide usage and weed occurence operate and sustain operations for a given set of environmental conditions must be able to shutdown spraying operations based on the weather conditions
- technical specifications vehicle mass payload mass operational speed: maximum speed vehicle and boon dimensions vehicle steering configuration External considerations costs format of the environment expected weed density soil type expected weed types (best weeding tool)
- which sensor types do you know? point sensor line sensor area scanner
- describe the point sensor 1 pixel cheap to produce often used to capture multi-spectral or hyper spectral information detect vegetaion in a region suing NIR and RED if there is vegetation than spray herbicide (WeesSeeker) if vegetaion is not healthy enough then spray fertilizer ( Yara Sensor)
- Describe the Line Scanner W pixels often used to obtain multi-spectral or hyper-spectral information can form an image by moving the sensor (need to know how the sensor moves) pack houses to dedtect defect (very fast, the object moves) often used to produce an image over an area
- function of an image sensor? each pixel can correspond to multiple wavelenghts -> a pixel is the response at a physical point in space -> the light is accumulated to give the strenght of the response -> often conferted to a number (digitised)
- describe the Camera area scanner WxH pixels abe to capture an area very quickly ubiquitous sensor find crop in an image classify the species of a plant in the image estimate the amount of vegetaion in an area (vegeation coverage)