Railtech pdr
This presentation is the property of its rightful owner.
Sponsored Links
1 / 29

RailTech PDR PowerPoint PPT Presentation


  • 55 Views
  • Uploaded on
  • Presentation posted in: General

RailTech PDR. Group Members: Mike Oertli Jonathan Karnuth Jason Rancier September 11, 2008. Project Overview. Linear accelerator Voltage applied to rails Projectile shorts out rails creating EM field Pneumatic kick-start Projectile accelerates forward. Basic Design.

Download Presentation

RailTech PDR

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Railtech pdr

RailTechPDR

Group Members:

Mike Oertli

Jonathan Karnuth

Jason Rancier

September 11, 2008


Project overview

Project Overview

  • Linear accelerator

  • Voltage applied to rails

  • Projectile shorts out rails creating EM field

  • Pneumatic kick-start

  • Projectile accelerates forward


Basic design

Basic Design

  • Conducting rails mounted to non-conducting surface

  • Capacitor array

  • PCB, logic, and UI

  • Conducting metallic projectile


Objectives

Objectives

  • Safety!!!

  • Adjustable voltage from capacitor bank

  • User interface

    • Keypad and LCD

    • Sensor data

    • Velocity calculations

    • Remote/Hands off (Safety!)


Approach

Approach

  • Split into 3 main areas

    • Railgun

    • Control system

    • User interface

  • Each person focus on one area

  • Communication and compatibility is key


  • Power supply

    Power Supply

    • Brute Force discharge

      • Basic supply, dumps a lot of current directly on rails

      • Simple to design, overkill on capacitance

      • Inefficient, back EMF problems

    • Recharger Supply

      • Complex LC timing based on rails

      • Prone to failure with bad design

      • Requires more capacitors (if polarized are used)

      • Much more efficient

      • Fast recharging


    Capacitors

    Capacitors

    • Capacitance: 610,000µF

    • Voltage: 20VDC

      • 30VDC surge

    • ESR: 2.1mΩ max

    • Type: Electrolytic

    • Number used: ~20

    • Cost: ~ $400


    Capacitor array

    Capacitor Array

    • Mounted capacitors

      • Connected by switches controlled by logic based on input voltage from user

      • Logic will be based on test shots

      • In enclosed case (Safety)

    • Other possibilities:

      • Manual switches

      • Switch mode power supply

    • Input inductor between array and rails

      • Ramps current to rails

      • Avoid discharging capacitors too fast


    Rail types

    Rail types

    • Cylindrical

      • Easier to fabricate

      • Fewer pieces

      • Stronger using less material

    • Rectangular

      • Easier to mount

      • Better electrical properties, distributed current


    Example of rail

    Example of rail

    Conducting rails


    Materials

    Materials

    • Rails: Brass

    • Projectile: Aluminum

    • Base: Garolite & Teflon

    • Capacitors: 20x 0.6F 20 v Electrolytic

    • Microcontroller: MSP430 family - 16 bit

    • PCB

    • Power supply

    • Sensors (EM, voltage)

    • Keypad and LCD


    Brass rails

    Brass Rails

    • Composite: ~70% Copper, ~.07% Lead, ~.05% Iron, Remainder Zinc

    • Electrical Conductivity: 28% IACS

    • Electrical Resistance: 6.2µΩ/cm

    • Friction: Very low with Most metals

    • Melting Point: 910oC

    • Inner/Outer Diameter: 0.87”/1”

    • Cost: $58.68 for 36”


    Projectile

    Projectile

    • Metal: Aluminum

      • Composite: 2011

      • Temper: T3

      • Part #: 88615K411

    • Melting point: 540oC

    • Electrical Conductivity: 45% IACS

    • Electrical Resistivity: 3.8µΩ/cm

    • Diameter: 7/8”

    • Length: ~1”

    • Cost: $17.41/foot


    Pneumatic kick start

    Pneumatic Kick-start

    • Avoids spot welding projectile

    • Added kinetic energy

    • Eliminates static friction coefficients

    • Compressed Air/CO2 system

      • Activated by Microcontroller post safety checks


    Chassis specs

    Chassis Specs


    Safety features

    Safety Features

    • Voltage sensors on rails, cap bank, & source

      • Kill power if out of expected range

    • EM Field Sensor

      • Faraday cage if EM field great enough

    • Plexiglas casing

      • Keep user isolated from high voltages and short circuited rails


    Block diagram

    Block Diagram

    Capacitor Array

    Inductor

    Rails

    Power Supply

    Kill

    Switch

    Keypad

    LEDs

    MSP430xxxx

    LCD


    Microcontroller

    Microcontroller

    • MSP430xxxx family

      • Testing on MSP430F169

    • 16-bit for accurate calculation of sensor data

    • Control safety logic based on sensor values

      • Disconnect switches from caps to rails

      • Display values on LCD


    Software engineering

    Software Engineering

    • Interface with Matlab

      • Import sensor data

      • Statistical analysis

      • Display results to user as graphs and tables

      • Maintain records


    Pcb elements

    PCB Elements

    • Power supply

    • MSP430 Family

    • Debug/information LEDs

    • LCD (3 or 4 rows)

    • Keypad input

    • Communication with sensors(A/D)


    Sensor

    Sensor

    • Measure voltage at high sample rate

    • Used for analysis and safety logic

    • Implementation:

      • Voltage transducer

      • Sample @ 10 MHz +

      • Response time < 50μs


    User interface

    User Interface

    • Basic keypad

      • Input desired voltage to apply to rails

    • 3 or 4 line LCD on PCB

      • Output sensor data and statistics

      • Basic input user interface

    • If time:

      • Keyboard input

      • Computer monitor with GUI

      • Matlab sensor data analysis


    Expenses

    Expenses


    Division of labor

    Division of Labor


    Schedule

    Schedule


    Real world application

    “Real World” Application

    • Control System for other high voltage applications

    • Accelerator for fun, military, other scientific research

    • Capacitor array for high current burst power systems

    • Sensor to Matlab interface


    Realization

    Realization

    • Stay under budget by getting donations

    • Establish primary goals/reasonable functionality

      • Operate within these

    • Add incremental levels of difficulty based on time


    Plan b

    Plan B

    • Risk:

      • Projectile fuses to rails

      • Discontinuities in the rails and base

      • Arcing- heat/damage to rails

    • Unfamiliarity

      • Sensing systems

      • Matlab interface

    • Recovery

      • Ask for help!

      • Use heavier duty components

      • RTFM

      • Have extra rails and projectiles ready


    Questions

    Questions?


  • Login