# Presentation: 665458

## Preliminary Analysis 

- Preliminary Analysis
- of
- TF Joint Behavior
- C Neumeyer
- 1/29/04

## Outline

-  Questions to be Addressed
-  Voltage Measurements
-  Fiber Optic Measurements
-  ISTP Shot List
-  Measurements from TF-Only Shots
-  Measurements from Combined Field Shots
-  Measurements vs. Analysis
-  Measurement Trends
-  Issues & Follow-on Work

## Questions To Be Addressed

- Does measured behavior agree with analytic model?
- How much difference between measurements and predictions?
- Does model need to be changed?
- Does operating envelope need to be reconsidered?
- Do all joints of the same type behave the same way?
- What variation exists joint-to-joint?
- Are any joints significantly different than others?
- 3) 	Is behavior changing as more load cycles are applied?

## Resistance Measurements

- R = Rbulk + Rcontact

-  Outer:
- - Predicted 75nOhm
- - Measured 40nOhm avg.
-  Inner:
- - Predicted 95nOhm
- - Measured 75nOhm avg.

*Need to resolve discrepancies*
*Need to measure R vs. P for flag proto*

## Fiber Optic Temperature, Strain, 

- Displacment Measurements

-  Four Flags (inner, outer/top, bottom)
- 4 flags x 3 strain/flag = 12 strain
- 4 flags x 1 temp/flag = 4 temp

- FISO Technologies, Inc.

*Total 21 transducers*

*8 conditioner channels*

-  Hub and Flag twist angle (inner, outer/top, bottom)
- 4 displacement

-  Spline (top only)
- 1 displacement

*Need to ring out transducer vs. extension cable*
*Need to troubleshoot several signals not working*

## Fiber Optic Temperature, Strain, 

- Displacement Measurements

-  Temperature probe
- 	- active length ~ 0.75”
- 	- epoxied in place
- 	- probe “response time” < 1 second
-  Strain probe
- 	- active length ~ 0.40”
- 	- epoxied in place

*We should characterize response (time, magnitude)*
*of both types of probes as epoxied into copper*

## ISTP-001 Shot & Signal List

## TF-only Shots (110795,6,7,8)

- TF-only Shots (110795,6,7,8)

* **53.4kA shot shows liftoff?*
* **LH/RH Strain gauges disagree at 46.2 & 53.4kA*

- Vprobe x100 (V)

- Itf
- (A)

- Tflag (degC)

- ∆ Sflag (μS)

- ∆ Sflag (μS)

- ∆LSpline (mils)

*Lift-off?*

## TF-only Shots (110795,6,7,8) (con’t)

- TF-only Shots (110795,6,7,8) (con’t)

- ∆ SShoe (μS)

## Combined Field Shots (110799,803)

- Vprobe x100 (V)

- 795
- 799
- 798
- 803

- 795
- 799
- 798
- 803

- 795
- 799
- 798
- 803

- 799
- 803

- Tflag (degC)

- ∆ Sflag (μS)

- ∆LSpline (mils)

- ∆ Sflag (μS)

- Ioh
- (A)

- Ioh
- (A)

*OOP Effect*

*Temperatures*
*Not effected much*

*OOP Effect LH & RH Side*

*Vibration?*

## Combined Field Shots (110799,803) (con’t)

- 795
- 799
- 798
- 803

- 803
- 809

- ∆LSpline (mils)

- ∆Flag (deg)

- 799

- 803

- Vprobe x100 (V)

- Vprobe x100 (V)

- Ioh
- (A)

- Ioh
- (A)

- Ioh
- (A)

- Ioh
- (A)

*Eddy Current Effect?*

*Twist w&w/o OOP!*

*19_19*

*19_19*

*0.08 v. 0.2*

*2.1 = 2.1*

## Combined Field Shots (110799,803) (con’t)

- ∆ SShoe (μS)

*Difference*
*IP vs. OP or due to*
*“**seating”?*

## Analysis vs. Measurements - Resistance

- 20_20 = Outer/Top

- TF-Only Measured

- Combined TF-PF (max time point)

- Brooks Analysis
- (two sides of joint,
- Combined TF-PF)

- OOP Effect

* **IP may be on*
*Track, but OOP*
*appears larger*
* **Some joints show much *
*larger IP-OOP variation!*

## Analysis vs. Measurements - Temperature

*Discrepancies may arise from *
*probe response*
*Probe averaging over length*
*liftoff*

## Analysis vs. Measurements - Strain (TF-Only)

*Tracks pretty well *
*until 53.4 kA case*

## Analysis vs. Measurements - Strain (con’t)

* **Analysis predicts more OOP strain variation than measured*
* **Analysis predicts more EOFT strain than measured*

## Analysis vs. Measurements - Strain (con’t)

* **Analysis overestimates up to 46.1kA, underestimates at 53.4kA*
* **OOP effect only evident at 53.4kA (or due to “seating”?)*

## 200A Trend from 1/12 to 1/29/04 - Outer/Top

*Probe failed and was*
*replaced*

*Data includes 2 measurements at 2 gains per test*

## 200A Trend from 1/12 to 1/29/04 - Outer/Bottom

## 5kA SOP Trend - Outer/Top

## 10kA SOP Trend - Outer/Bottom

## SOFT Trend - Outer/Top

*TF Current*

*20_20*

*19_19*

## SOFT Trend - Outer/Bottom

## EOFT Trend - Outer/Top

## EOFT Trend - Outer/Bottom

## Issues & Follow-On Work

-  Resolve fiber-optic problems (signal ID and repairs)
-  Time response of fiber optic probes?
-  Analysis vs. Measurements, and lift-off at 53.4kA?
-  Run ANSYS Vprobe predictions for ISTP shots
-  Investigate higher OOP Vprobe effect than predicted
-  Investigate lower OOP strain than predicted
-  Why did prototype testing not show large R variations?
-  Inspect worst case joints at next opening
-  Establish allowable on resistance (200A, SOP, SOFT, EOFT?)
-  Refine models (finer mesh?) so 6kG operation can be justified