# Presentation: 520197

## DOLILU OperationsRoll Maneuver Assessment

**Brian Harrington/USA-FDD**
**Brian.E.Harrington@usa-spaceops.com**
**[SMG] Weather Users Forum**
**4/20/05**

## Background/Summary

**During the STS-107 reconstruction, some loads (P13) during the Single Axis Rotation (aka. Roll Maneuver) were observed to be higher than seen in High-Q.  Due to wind sensitivity of the loads in this region, a DOL assessment is required.**
**Loads/Aero/A-GNC/Natural Environment Panels are recommending an Alpha, Beta, Q-bar DOL constraint (“Q-Plane”) and/or Wind “Placard” that will ensure the vehicle loads are within allowable.**
**This is new for STS-114 (RTF) and all the details are not 100% complete as of this briefing date.**
**This presentation will demonstrate:**
**DOLILU basics**
**Use of Balloon systems**
**Sensitivities to wind data**
**STS-114 Roll Maneuver Q-planes and Wind Placard**
**Evaluating the SMG Upper Winds Forecast**

## What is DOLILU?

_**D**_**ay **_**o**_**f **_**L**_**aunch **_**I**_**-**_**L**_**oad **_**U**_**pdate (DOLILU) Operations process performs two Shuttle launch day functions**
**DOL I-load generation**
**1****st**** stage guidance polynomials**
**SSME throttle profile**
**Structural loads constraint verification**
**Formerly the responsibility of the Launch Systems Evaluation and Advisory Team (LSEAT)**
**System developed by the Space Shuttle Systems Integration Office**
**Operational requirements and constraints specified in NSTS 08329, vol. VIII – DOLILU Operational Support Plan (DOSP)**
**The Team:**
**Loads and DOLILU Officer (LDO) -- JSC/DM4**
**Mission Control Center (MCC) support room position **
**Provides DOLILU GO/NO-GO recommendation to MOD Mission Management Team representative**
**Ascent Support Team -- USA Flight Ops (“Ascent Support”)**
**MCC support room positions**
**Perform DOLILU processing and trajectory/loads/performance QA**
**DOLILU IV&V -- USA Systems Integration & Boeing**
**Independent offsite support positions**
**Perform parallel DOLILU evaluation**
**MSFC Environments -- MSFC/ED4 (“Marshall Winds”)**
**Remote (Huntsville Operational Support Center) support position**
**Provides DOLILU environmental constraint evaluation**

**Chart courtesy CAIB presentation from B. Conte/DM4**

## DOLILU Data Flow

**Roll Maneuver assessments will be done similar to those done for High-Q**
**I-Load design is nominally designed off the L-4:35 Jimsphere**
**DOLILU I-loads are uplinked to the vehicle about 3 hours before launch and then this design is verified by the DOLILU team (with IV&V) with each subsequent balloon with the release of the last assessed balloon about 1 1/2 hours before launch.**

## Balloon Usage

**Jimspheres (in 100ft intervals) are used for wind data**
**No data drop-outs greater than 400ft are permitted from 7500 to 52Kft**
**Monthly mean wind data is ramped following balloon termination over 5Km**
**LR AMPS (in 1000ft intervals) are used for atmosphere thermodynamic data**
**The L-9:00 and L-6:20 are used.  Once the L-6:20 is in, this data is not updated**
**This data is required to 60Kft**
**HR AMPS is still under evaluation, however it is planned for use on DOLILU Roll Maneuver should the L-1:10 Jim fail**
**50MHz DRWP is only used by MSFC Environments to help validate the Jimsphere profiles**
**Balloon data is received by USA via direct comm. lines to the Cape, not over MIDDS**

## Balloon Visualization

**The wind is converted for visual purposes only into *****in-plane***** and *****out-of-plane***** components.  This is to better understand the associated influences on Alpha (angle of attack) and Beta (sideslip angle) actions of the vehicle.**
**For 51.6 degree inclinations, a 43.0 degree ideal flight azimuth is used.**

**Pair #96 from Winter 3.5 (114  total pairs)**

## Resultant Alpha, Beta, Qbar

**In-Plane Wind**
**Resultant Alpha**
**High Frequency content of the wind is important**

**Out-of-Plane Wind**
**Resultant Beta**
**Wind features are easily aligned with beta**

**Resultant Qbar**
**Not easily aligned with wind features**

**Pair #96 from Winter 3.5 (114  total pairs)**

## Now with wind 3.5 hours later

**Changes in the In-Plane wind can be seen in the differences in Alpha**
**Alpha is generally better controlled than Beta**

**Changes in the Out-of-Plane wind can be seen in Beta.**
**If a wind feature shifts up or down, so does the alpha/beta feature**

**Changes in Qbar are due to wind **_**and**_** atmosphere changes**

**Pair #96 from Winter 3.5 (114  total pairs)**

## DOLILU Constraint Checks

**Among other rules, the resultant Alpha, Beta, Qbar (ABQ) must fall within a limit, represented below.  This can loosely be called a “Q-Plane”.**
**In this assessment, DOLILU statistically accounts for certain uncertainties (aka. “knockdown” or “dispersion”) :**
**Atmosphere persistence: the amount Qbar can change in 12 hours**
**System dispersions: non-predicted results of ABQ (not due to atmos/wind)**
**Wind persistence: 99% of the variability of ABQ in 2 or 3.5 hours**

**These “dispersions” will be a bias to the base numbers evaluated.  That is, this increment will be applied after the trajectory has been generated (post-processing.)  This increment is not an input to the trajectory or design (pre-processing.)**
**The wind/atmos drive our ABQ, we then add dispersions to the ABQ and then compare these dispersed values to the constraints.**

## STS-114: DOL Timeline & Reporting

**Each LDO report will contain High-Q and Roll Maneuver results from the same balloon, except L-2:15**
**Final GO/NO-GO Roll Maneuver assessment will be based on the L-1:10 Jimsphere**
**If the L-1:10/L-1:05 Roll Maneuver assessment is NO-GO, then DOLILU is NO-GO**
**The L-1:10 Jim will be the primary balloon for Roll Maneuver GO/NO-GO calls.  The L-1:05 AMPS High Resolution (HR) balloon acts as a backup to the L-1:10 Jim**
**By the time the L-2:15 Jim is complete and ready to process, the L-1:10 Jim is past the Roll Maneuver altitude region.  Therefore, the L-1:10 Jim will be assessed and there is no need to process the L-2:15 Jim for Roll Maneuver.**
**It is more reliable to maintain dual tracking on the L-1:10 Jim than single track two Jimspheres**
**Final GO/NO-GO High-Q assessment is **_**unchanged**_** and is based on the L-2:15 Jimsphere**

## STS-114: Roll Maneuver “Q-Planes”

**DOLILU Q-planes will be evaluated as is done in High-Q assessments**
**DOL Balloon Profile:**
**Balloon data is needed from 1500 to 7,500 feet, with no data dropouts greater than 400 ft**
**For the L-1:10 Jim and L-1:05, Cape Winds will verbally make a call to Houston Winds indicating that 7.5Kft was delivered, and indicate the drop-outs up to that altitude**
**USA and Boeing will then ingest the partial balloon profile**
**Cape Winds will continue nominal processing of L-1:10 profiles past 7.5Kft to termination**
**The L-1:05 HR will be released each launch attempt, and terminated at 7.5Kt**
**Cape Winds will cut off the L-2:15 Jim at 52Kft to support timeline issues**
**It is expected to take about 15 min from balloon release to 7.5Kft to the customer**
**L-0:30 LR will be made available in 100ft segments up to 7.5Kft for MSFC Winds**

**MSFC Winds Assessment:**
**Measurement acceptability by comparing the profile to other sources: 915 MHz and past Jim, LR, HR**
**Wind Shear assessments is currently under review**
**Marshall Winds will monitor the winds until L-15min**
**SMG Upper Winds Forecast:**
**USA and MSFC will receive the Forecast via MIDDS, Boeing does not have electronic access**
**LDO will use the Forecast **_**only**_** as an advisory tool**

## STS-114: Roll Maneuver Wind Placard

**If the L-1:10 Jim wind speed is greater than 60f/s from the North, or 50f/s from the South DOLILU is No-Go**
**Wind data will be evaluated from 2500-4500ft**
**From R. Decker/MSFC 4/19 SSEIG:**
- Primary wind placard assessment uses L-1:10 Jimsphere balloon.
- Assessment complete and reported to MOD/Loads and DOLILU Officer (LDO) at L-0:45.
- MOD/LDO will be polled by MMT at L-0:30.
- If assessment is NOGO then MOD/LDO NOGO for launch.
- AMPS HRFE launched at L-1:05.
- Used as a backup to the L-1:10 Jimsphere if it fails.

**Drawn incorrectly, now 60f/s over 50f/s**
**(Data courtesy Mike Oelke/Boeing)**

## SMG Upper Winds Forecast

**Current use by DOLILU:**
**Could be used to delay I-Load design from the L-4:35 to the L-3:25 Jimsphere if significant change was predicted**
**This was done on STS-113**
**Used to determine trends as compared to measured profiles**
**Used in Roll Maneuver for expected change from the L-1:10 Jim**
**Use of the Forecast was considered for use in the Roll Maneuver constraint checks, even evaluation by running the DOLILU process on it as if it was the measured wind.**
**Reasons that was used to not use for Roll Maneuver checks:**
**Forecast uncertainty:  DOLILU uses dispersions on other parameters, we would have to account for this uncertainty in a similar manner.**
**Lack of High Frequency Content:  DOLILU is sensitive to the small changes in the wind.**
**Data intervals:  Wind data is normally expected every 100ft.**
**Boeing (IV&V) does not have electronic access to the Forecast.**
**Lack of confidence/Not familiar with the Forecast.**
**Need for L-0 at launch site Forecast (or perceived need).**

## DOLILU Future Changes

**Before the Winter months, DOLILU will be pursuing options to better operate, they include:**
**Changing the Jimsphere release schedule**
**The last High-Q balloon might be around L-1:45.  This moves the last High-Q assessment 30min closer to launch**

**Late “Large Scale Wind Change” rule**
**This will compare the long wavelength features of two wind profiles and compare this difference to a limit.  Should this limit be exceeded for a defined altitude length, then the DOLILU I-Loads are no longer valid, and DOLILU is No-Go.**

**(Data courtesy Dan Puperi/USA)**

## DOLILU Forward Plan

**This STS-114 concept has been put in place by USA, Boeing, and MSFC.**
**This STS-114 concept was simulated with live balloon data on:**
**4/6   - Weather Sim**
**4/14 - Tanking Test**
**The process to assess Roll Maneuver Q-planes on DOL is being validated by the current DOLILU 2004.01 Block Update**
**DOLILU Ops Concepts for Roll Maneuver will be in the Block Update “Clean-up” CR, to be submitted this week (before Friday 4/22)**
**This DOLILU change along with all the other changes is planned to have an Operational Acceptance Review at the SICB on 4/26**

## Backup

## L-4:35 Balloon Sequence

**Access Cape Canaveral Air Station (CCAS) wind and atmosphere **
**LR balloon contains atmospheric data in 1000 ft alt increments through 100,000 ft**
**Temperature, pressure, density, dew point**
**Jimsphere balloon contains wind speed and direction in 100 ft increments through 52,000 ft**
**Generate DOLILU I-loads using the DADS program and DOL winds and atmosphere**
**Transmit to Boeing for independent assessment**
**Transmit to MCC for uplink**
**Run 6 dof SVDS trajectory simulation program with DADS I-loads and DOL winds & atmosphere**
**Evaluate constraints**
**DOLILU QA rules**
**Orbiter, ET & SRB load indicators, Orbiter q-planes and ET zero margin constraint**
**Environmental**
**Uplink DOLILU ~L-2:00 to 1:30**
**Execute GPC dump and compare to SVDS output**
**Report Status to MOD rep. on MMT**

**Chart courtesy CAIB presentation from B. Conte/DM4**

## DOSP Go/No-Go Rules

## DOSP Go/No-Go Rules

## DOSP Go/No-Go Rules