Wireless Test Instrumentation for Rotating Parts

Transcription

1 Wireless Test Instrumentation for Rotating Parts ECE 193 Advisor: Rajeev Bansal Olivia Bonner David Vold Brendon Rusch Michael Grogan ME 32 Advisor: Robert Gao Kyle Lindell Andrew Potrepka

2 Problem Statement Solution Parts Ordered Parts To Be Ordered Improvements To Electronics Energy Harvesting Options Battery Options Future Tasks Budget Timeline Outline

3 Problem Statement Sikorsky has asked the team to come up with a proof of concept for a wireless sensing system. Benefits of a Wireless System: No long, heavy wires No slip rings Overall weight of system reduced Challenges of a Wireless System: Powering the system Large temperature range -65 F to 400 F

4 System Requirements Electronics Compartment: Size: 1.5 diameter x 5.1 long Temperature Range: -65ºF to 300ºF Sensor(s): Minimum of 2 sensor types Temperature Range: -65ºF to 400ºF Rotating Speed of Tail Rotor Shaft: 1200 RPM

5 System Block Diagram Figure 1. System Block Diagram

6 Power Circuitry Figure 2. Power Circuitry Block Diagram

7 Ordered Parts Sensor(s): Infrared thermometer Ambient thermometer Accelerometer Microphone Microcontroller: Arduino Nano v3.0 Transceiver: WiFly Module

8 Parts To Be Ordered Energy Harvesting Method Brushless Generator Power Circuitry Battery Rectifier Switching Regulator Charging Circuit Lithium cells (Li-Ion, Li-Poly)

9 Improvements to Electronics Previous Design: Custom built, expensive to replace/modify No documentation Limited connectivity Missing components Our Design: Greater connectivity Small size Affordable Greater available documentation

10 Electronics Options New Custom Design: Get only what we need in the size we want Prohibitively expensive (cost > $1300) Only can afford one Little documentation Off the shelf options (Arduino, Teensy): Excellent connectivity Available in our size Open sourced, excellent documentation Affordable (cost < $40)

11 Arduino Nano V3.0 Small, low power evaluation board Plenty of documented projects and code on website Many compatible sensors/add ons for sale

12 Sensor/Add-on Choices Triple axis accelerometer Electret microphone Ambient thermometer Infrared thermometer Low-power wifi module

13 Energy Harvesting Options Thermoelectric - Insufficient power from available temperature gradient Piezoelectric - Too large - Insufficient power - Needs vibrations within a narrow range of frequencies Magnetic - Sufficient power - Requires low KV motor, gearing, or a step-up regulator - Necessitates use of gravitational torque

14 Battery Options NiCd and NiMH - Quick and simple charging - Durable - Poor energy density - 1.2V per cell - Smaller temperature range - Memory (NiCd only) Lithium cells (Li-Ion, Li-Poly) - High energy density - 3.7V per cell - Various shapes available (Li-Poly) - Wider temperature range - More complex charging - Less durable

15 Battery Charging Circuit Options Create our own: Uses transistor, variable regulator, 2 capacitors, potentiometer, 1 Ohm/1 Watt resistor, 3 normal resistors

16 Battery Charging Circuit Options Using Power Management IC Chips: Chip Features: Charger Plus Pack Protection in One IC Low Operating Current (550nA) Near Zero Current (<0.1nA) Low Battery Disconnect Function to Protect Batteries from Over-Discharge Pin Selectable Float Voltage Options: 4.0V, 4.1V, 4.2V Ultralow Power Pulsed NTC Float Conditioning for Li-Ion/Polymer Protection Suitable for Intermittent, Continuous and Very Low Power Charging Sources High Battery Status Output

17 Battery Charging Circuit Options Using Power Management IC Chips: Chip Features: combines high-accuracy current and voltage regulation,battery conditioning, temperature monitoring, charge termination, charge-status indication, and AutoComp charge-rate compensation in a single 8-pin IC.

18 Test Rig: Potential Modifications Different circuit different layout inside capsule Mount the rig to change pitch angle Second set of wired sensors for data comparison

19 Tasks for Next 45 Days Assemble and test Arduino Nano with sensors Assemble and test Wi-Fi module Order: motors, batteries, charging circuit equipment Make modifications to test rig as necessary

20 Budget Budget: $2,000 Spent to Date: $159 Additional Estimated Costs: $350 Estimated Surplus: $1,491 Purchase Breakdown Arduino Nano $35 Mini B USB Cable $4.50 Xbee Add-on Board $25 Wifi module $35 Nano Protoshield $15 Triple Axis Accelerometer $15 Infared Thermometer $20 Thermometer $1.50 Electret Microphone $8 DC Generator (Estimated) $20 Power Management Circuitry (Estimated) $30 Battery (Estimated) $100 Printed Circuit Board (Estimated) $200 Total $509

21 Timeline

22 Questions

23 Student Assessment Presentation Style Readability of Material Team results and deliverables are clear? Grade A, B, or C with clicker