Project

# Title Team Members TA Documents Sponsor
39 Anti-Hypothermia Jacket For Pro Climbers
 Chengyu Fan
Yifan Pan
Yifu Guo
 Shaoyu Meng design_document1.pdf
final_paper1.pdf
other1.pdf
proposal1.pdf
#Problem:
Highland climbing is always dangerous because of extreme environments such as oxygen deficit and extreme low temperature. Therefore, we decided to integrate a traditional climbing jacket with a dynamic temperature adjustment & monitor package powered by detachable battery packages. Currently, there is no outdoor company selling such first aiding products for professional climbers to protect their life.

Note: Many great explorers died because they are under Anoxia above 5000m and then lose their body heat unconsciously under Coma and Hypothermia. Therefore, a fully automatic system needs to be designed to monitor hazardous body temp loss and adjust the jacket temp to stop climbers’ further heath problems.

#Solution Overview:
Our team wants to design a jacket integrated with TEC grids controlled by microprocessors and powered by detachable battery packages. The package has two modes. When body temp loss is not detected, users can use the package to deal with sudden temp drop and the temp adjustment is controlled by a microprocessor and each heating period is 15 minutes. Another mode is first-aiding mode. During this mode, the system will heat the inner temperature of jacket constant at about 37 C and give warning to climbers so that they can return back to base within the battery limit or ask their teammates for help. For design overview, two TEC grids (about 20 pads) will be arranged in an efficient way to cover both fore-breast and back-breast and are controlled by a microprocessor and powered by detachable battery packages.

#Solution components:

##Power subsystem:
- The batteries should work properly under severe conditions. Lithium Ion batteries’ recommended storage temp is 5°C to 10°C. However, because we will integrate batteries (about 100Wh each package) in the jacket, the temperature around the battery will not drop below body temp by too much.
- Batteries should be detachable like LEGO toys and users can add batteries according to climbing time. Usual climbing activities lasts for less than 5 hours because there are bases at each altitude and people can get back or ask their teammates for help after they receive body temp warning from our system and at the same time the system will work to compensate for body temp loss.
- Li-ion battery packages should be small enough and light enough. According to market research, usual Li-ion batteries have 225Wh/Kg which is light enough even for 5-Hour climbing if the whole system’s power is within 50W.
- The Power Amplify Circuit needs to act as multi-switches which take PWM from Micro-Processor as input and drive the TEC grids.

##Thermoelectric cooler subsystem:
- Individual TEC grids should provide enough heat to secure the user in extreme cold conditions while preventing burning injuries due to excess heat.
- TEC grids are efficiently structured over important organs of the body to provide the same surface temperature for different parts of the body.
- Vapor Chamber should be designed to reduce heat loss and also evenly distribute the heat radiation.
- TEC grid’s power usage should be smaller than 100W to ensure at least 1H usage which satisfies our least climbing time using 1 Wh battery package. For each TEC module, ( for example, HiLetgo 2pcs TEC1-12706, etc…) most of the common models’ peak static power usage on the market is about 60W at 12V and 5A and work from -30C-70C. However, because our goal is for heating instead of cooling and according to user reviews, the static voltage to make one module’s heat surface go up to from 20-30C to 50C is 6V, which means power usage will be at about 15W for each module. Besides, we will only need the module to work between 20C to 40C to change the inner temp of the jacket. Therefore, the static power usage should be even lower. Besides, those pads will be driven by PWM signals controlled by sensors which reduce the total power below 100W.

##Control system:
- The Microprocessor should control the Pulse Width of signals that control the on/off of TEC and have the ability to switch between different output stages based on multi-temperature sensors which are used to detect the human body’s temperature, vapor chamber temperature and out jacket temperature. The sensors will be installed as analog sources on Arduino and send feedback to the circuit to control the output PWM signals.
- A manual switch should be able to turn on the TEC grids for 15mins/term during normal mode.

##Warning system:
- The system should concisely monitor body temperature and send out sound warning and LED light warning to climbers.

#Criterion for success:
Our solution will be successful if this jacket can dynamically adjust it’s working stage to efficiently control TEC grids to certain temp at both normal mode and first-aiding mode. Besides, the system can detect any hazardous body temperature loss and stop people from additional body temperature loss under severe conditions at first aiding mode and send out warnings to climbers.

Resonant Cavity Field Profiler

Salaj Ganesh, Max Goin, Furkan Yazici

Resonant Cavity Field Profiler

Featured Project

# Team Members:

- Max Goin (jgoin2)

- Furkan Yazici (fyazici2)

- Salaj Ganesh (salajg2)

# Problem

We are interested in completing the project proposal submitted by Starfire for designing a device to tune Resonant Cavity Particle Accelerators. We are working with Tom Houlahan, the engineer responsible for the project, and have met with him to discuss the project already.

Resonant Cavity Particle Accelerators require fine control and characterization of their electric field to function correctly. This can be accomplished by pulling a metal bead through the cavities displacing empty volume occupied by the field, resulting in measurable changes to its operation. This is typically done manually, which is very time-consuming (can take up to 2 days).

# Solution

We intend on massively speeding up this process by designing an apparatus to automate the process using a microcontroller and stepper motor driver. This device will move the bead through all 4 cavities of the accelerator while simultaneously making measurements to estimate the current field conditions in response to the bead. This will help technicians properly tune the cavities to obtain optimum performance.

# Solution Components

## MCU:

STM32Fxxx (depending on availability)

Supplies drive signals to a stepper motor to step the metal bead through the 4 quadrants of the RF cavity. Controls a front panel to indicate the current state of the system. Communicates to an external computer to allow the user to set operating conditions and to log position and field intensity data for further analysis.

An MCU with a decent onboard ADC and DAC would be preferred to keep design complexity minimum. Otherwise, high MIPS performance isn’t critical.

## Frequency-Lock Circuitry:

Maintains a drive frequency that is equal to the resonant frequency. A series of op-amps will filter and form a control loop from output signals from the RF front end before sampling by the ADCs. 2 Op-Amps will be required for this task with no specific performance requirements.

## AC/DC Conversion & Regulation:

Takes an AC voltage(120V, 60Hz) from the wall and supplies a stable DC voltage to power MCU and motor driver. Ripple output must meet minimum specifications as stated in the selected MCU datasheet.

## Stepper Drive:

IC to control a stepper motor. There are many options available, for example, a Trinamic TMC2100. Any stepper driver with a decent resolution will work just fine. The stepper motor will not experience large loading, so the part choice can be very flexible.

## ADC/DAC:

Samples feedback signals from the RF front end and outputs the digital signal to MCU. This component may also be built into the MCU.

## Front Panel Indicator:

Displays the system's current state, most likely a couple of LEDs indicating progress/completion of tuning.

## USB Interface:

Establishes communication between the MCU and computer. This component may also be built into the MCU.

## Software:

Logs the data gathered by the MCU for future use over the USB connection. The position of the metal ball and phase shift will be recorded for analysis.

## Test Bed:

We will have a small (~ 1 foot) proof of concept accelerator for the purposes of testing. It will be supplied by Starfire with the required hardware for testing. This can be left in the lab for us to use as needed. The final demonstration will be with a full-size accelerator.

# Criterion For Success:

- Demonstrate successful field characterization within the resonant cavities on a full-sized accelerator.

- Data will be logged on a PC for later use.

- Characterization completion will be faster than current methods.

- The device would not need any input from an operator until completion.

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