A dynamometer was found to create 300 Watts of heat from friction every second. Thermal studies showed the resulting temperatures of the dynamometer over variable increments of time.

1. Thermal Analysis of Dynamometer Rod - Steel
Author: Sean Clark
Company: Oakland Schools Technical Campus NE

2. Table of Contents
Table of Contents ................................................................................................................ 2
List of Figures ..................................................................................................................... 2
Description .......................................................................................................................... 3
Assumptions ........................................................................................................................ 3
Model Information .............................................................................................................. 3
Study Properties .................................................................................................................. 3
Units .................................................................................................................................... 3
Material Properties .............................................................................................................. 3
Loads and Restraints ........................................................................................................... 4
Connector Definitions ......................................................................................................... 4
Contact ................................................................................................................................ 4
Mesh Information................................................................................................................ 4
Study Results ...................................................................................................................... 4
Conclusion .......................................................................................................................... 8
List of Figures
dyo rod-Study 3-Thermal-Thermal2 ................................................................................... 5
dyo rod-Study 3-Thermal-Thermal3 ................................................................................... 6
dyo rod-Study 3-Thermal-Thermal4 ................................................................................... 8

3. Description
Summarize the FEM analysis on dyo rod
Comments:
A dynamometer was designed to rub up against a piece of fabric to calculate foot pounds of torque. The temp of the Dynamometer drum was calculated.
Assumptions
Comments:
The Friction created was 300 Watts
Model Information Document Name Configuration Document Path Date Modified dyo rod Default H:dyo rod.SLDPRT Tue Mar 11 10:09:55 2014
Study Properties Study name Study 3 Analysis type Thermal Mesh Type: Solid Mesh
Solver Information Quality: High Solver type FFEPlus Solution type: Transient: Total time: 12 seconds. Time Increment: 1 seconds. Initial Temperature: From study Outside temp
Units Unit system: SI Length/Displacement mm Temperature Kelvin Angular velocity rad/s Stress/Pressure N/m^2
Material Properties No. Body Name Material Mass Volume 1 SolidBody 1(Mirror1) AISI 1020 3.29427 kg 0.000416996 m^3
Material name: AISI 1020 Description: Material Source:

4. Material Model Type: Linear Elastic Isotropic Default Failure Criterion: Max von Mises Stress Application Data:
Property Name Value Units Value Type Elastic modulus 2e+011 N/m^2 Constant Poisson's ratio 0.29 NA Constant Shear modulus 7.7e+010 N/m^2 Constant Mass density 7900 kg/m^3 Constant Tensile strength 4.2051e+008 N/m^2 Constant Yield strength 3.5157e+008 N/m^2 Constant Thermal expansion coefficient 1.5e-005 /Kelvin Constant Thermal conductivity 47 W/(m.K) Constant Specific heat 420 J/(kg.K) Constant
Loads and Restraints
Load Load name Selection set Loading type Description Heat Power-1 <dyo rod> Heat power of 300 W on 1 Face(s) Sequential Loading
Connector Definitions
Contact
Contact state: Touching faces - Free
Mesh Information Mesh Type: Solid Mesh Mesher Used: Standard mesh Automatic Transition: Off Smooth Surface: On Jacobian Check: 4 Points Element Size: 0.29421 in Tolerance: 0.014711 in Quality: High Number of elements: 8261 Number of nodes: 13848 Time to complete mesh(hh;mm;ss): 00:00:01 Computer name: NEEM13
Study Results
Default Results

5. Name Type Min Location Max Location Thermal2 TEMP: Temperature at Step No: 6(6Sec) 65 Fahrenheit Node: 1 (-4.44272 in, -0.22185 in, 0.125 in) 71.6804 Fahrenheit Node: 409 (-13.4078 in, -1.12098 in, 0.971334 in) Thermal3 TEMP: Temperature at Step No: 12(12Sec) 65 Fahrenheit Node: 1 (-4.44272 in, -0.22185 in, 0.125 in) 76.5679 Fahrenheit Node: 308 (-13.5516 in, -1.28455 in, 0.741634 in) Thermal4 TEMP: Temperature at Step No: 1(1Sec) 65 Fahrenheit Node: 1 (-4.44272 in, -0.22185 in, 0.125 in) 67.0562 Fahrenheit Node: 471 (-11.25 in, 0 in, -1.48327 in)
dyo rod-Study 3-Thermal-Thermal2

6. dyo rod-Study 3-Thermal-Thermal3

7. dyo rod-Steel Thermal-Thermal-Thermal5

8. dyo rod-Study 3-Thermal-Thermal4
Conclusion
Comments:
After the dynamometer has been under friction for 12 seconds, the maximum temperature of the Drum will increase from 65 degrees Fahrenheit to 76.56 degrees Fahrenheit. After 120 seconds, the maximum temperature of the Drum will increase from 65 degrees Fahrenheit to 148 degrees Fahrenheit.