Experiment Requirements Document
for the
Polymer Battery Experiment (PBEX)
on the TSX-6 Spacecraft
Version 1.0
16 April 1997
"DISTRIBUTION C. Distribution authorized to US Government agencies and their contractors; Administrative or Operational Use; 3 Oct 96. Other requests for this document shall be referred to SMC/TELS, 3550 Aberdeen Ave SE, Kirtland AFB NM, 87117-5776."
"DESTRUCTION NOTICE- Destroy by any method that will prevent disclosure of contents or reconstruction of the document."
Approved by:
__________________________________
Dr. Joseph Suter Date
Principal Investigator for PBEX
The John Hopkins University, Applied Physics Laboratory
__________________________________
Col. Thomas Mead Date
Program Manager, Space Test Program
TABLE OF FIGURES
Figure 3.1-1: Photograph of Polymer Battery Experiment 3
TABLE OF FIGURES
Table 4.1-1: PBEX Power Requirements 5Table 6.1-1: PBEX Telemetry Points 8Table 7.1-1: PBEX Static Load Limits 9Table 7.2-1: SC-to-PBEX Random Vibration Limits 9Table 7.3-1: SC-to-PBEX Pyroshock Limits 9Table 7.5-1: Conducted Emissions from PBEX 10Table 7.5-2: PBEX Sensitivity to Radiated Emissions 10Table 7.5-3: PBEX Sensitivity to Conducted Emissions 11Table 7.5-4: PBEX Sensitivity to Magnetic Fields 11Table 7.9-1: PBEX Temperature Limits 12Table 12.1-1: Deliverables for PBEX Mission 17
This document contains the specific requirements of the Polymer Battery Experiment for manifest on the TSX-6 mission. It provides experiment requirements in the following areas: physical and functional interfaces, spacecraft (SC) integration and test, launch systems, and on-orbit flight operations.
The Polymer Battery Experiment (PBEX), or "The Experiment," refers to the flight hardware of the experiment.
"The Experimenter" represents the aggregate of the PBEX Principle Investigator, his/her staff, associated contractors, and agents.
"The Spacecraft (SC)" refers to the aggregate of the hardware, firmware, software, and services necessary to allow PBEX to operate in space.
"The Space Vehicle (SV)" refers to the SC integrated with PBEX.
"The Launch Vehicle (LV)" refers to the hardware, firmware, software, and services required to place the SV safely into the proper orbit.
"The SC Contractor" or "The Contractor" refers to the aggregate of the firm (s), the project manager(s), his/her/their staff(s), and associated subcontractors and agents who provide the SC, integrate PBEX to form the SV, test the SV, ship the SV, and launch the SV.
"The SV Operator" refers to the aggregate of the firm and/or agency, project managers, his/her/their staff(s), and associated subcontractors and agents who format, verify, and send commands to the SV, and receive, process, format and deliver telemetry to the Experimenter. The SV Operator and the SC Contractor may be, in whole or in part, the same entities.
This experiment will test the performance of advanced all-plastic batteries in space. The plastic battery operates along the same principles of any other rechargeable battery. However, the polymer battery has a plastic anode, cathode and gel electrolyte. The polymer battery promises a more flexible power source for future space missions
To evaluate the charging and discharging characteristics of plastic batteries in a space environment.
PBEX will be powered on following SC checkout, and will remain powered continuously throughout SC life. PBEX will use the integrated solar cells or supplied SC power to charge the polymer battery, and will discharge the battery across a resistive load.. PBEX will be commanded, by real-time or scheduled commands generated by the Experimenter, to alternate between charging and discharging cycles. PBEX telemetry data will be collected and transferred to the SC for temporary storage. The SC shall transmit stored PBEX telemetry to the ground to be forwarded to the experimenters.
PBEX has no orbit requirements for the TSX-6 mission.
PBEX has no launch window requirements for the TSX-6 mission.
The SC shall support PBEX for a 6 month mission life, beginning at the end of space vehicle on-orbit checkout. The SC shall accept a goal to support PBEX for a 12 month mission life.
PBEX achieves at least 360 charge/discharge cycles on-orbit. This roughly corresponds to one month of on-orbit operations.
PBEX operates continuously for the entire mission and obtains in excess of 5000 charge/discharge cycles over a broad temperature range. It is a goal of PBEX to achieve charging and discharging of the battery on a per cycle basis at 90 % of its capacity over the stated temperature range. The 90% depth of discharge is optimum, however, other levels are acceptable.
PBEX consists of an aluminum box housing the polymer battery (plastic anode, cathode and gel electrolyte) and electronics for telemetry. One face of the box is covered with integrated solar cells. Figure 3.1-1is a picture of PBEX.
Figure 3.1-1: Photograph of Polymer Battery Experiment
Figure 3.1-1: Polymer Battery
PBEX does not define a unique coordinate system for the experiment unit.
The experiment's physical measurements will not exceed 14 cm (w) by 14 cm (l) by 5.6 cm (h), not including four standoff mounting holes. Each mounting hole extends approximately 1.3 cm from the side, and measures approximately 1.3 cm in width
The PBEX mounting plate is 1/16-inch thick Aluminum plate with four standoff mounting holes. The SC Contractor shall provide the mounting bolts. The SC Contractor shall confer with the Experimenter to determine the proper size of the mounting bolts.
All electrical connections (including power and signals) to PBEX will be through one 15 pin AMP double density connector. The Experimenter will provide three complete sets of connectors (male and female), and one set of compatible connector savers. The SC Contractor shall terminate all cables to the provided connectors in accordance with ICD drawings established by the Contractor and the Experimenter.
The experiment weight will not exceed 2 pounds.
The center of mass of PBEX is approximately the geometric center of the unit.
Mass Moment of Inertia (kg-cm2)
TBD
PBEX will have no moving parts.
The SC Contractor shall mount PBEX to the S/C using the existing mounting holes as described in Section 3.1.3.
The SC Contractor may use discretion in choosing the mounting location and alignment, provided all requirements in this ERD and subsequent Interface Control Documents are satisfied.
The Contractor shall provide PBEX solar cells exposure to direct sunlight. Exposure frequency shall be at least once per orbit during the most favorable beta-angle conditions. The Contractor and the Experimenter shall negotiate the final field of view requirements.
The Experimenter will provide a wooden mock-up, mass model, an electrical load simulator, a thermal model, and an experiment-to-SC interface simulator and/or engineering model as required.
ELECTRICAL INTERFACE REQUIREMENTS
The SC shall provide one unregulated 28 6V power line to PBEX for charging the polymer battery. The SC shall also provide one 5 1V power line for the experiment electronics.
In-rush current into PBEX shall not exceed TBD A on the 28V line, and shall not exceed TBD A on the 5V line.
The SC shall be capable of switching each individual power line on or off through the SC commanding system.
PBEX has no unique isolation requirements. PBEX will comply with the single point grounding convention.
The SC shall provide 0.3 watts orbit average power (OAP) over the 28V line and 0.1 watts OAP over the 5V line continuously during nominal on-orbit SC operations.
The SC shall support the power profiles listed in Table 4.1-1.
Table 4.1-1: PBEX Power Requirements
Experiment Mode Line Peak Power Duty Cycle
Operating (Charging) 28V 0.5 W 50%
5V 0.1 W
Standby* 28V -- 50%
(Discharging) 5V 0.1 W
Peak Power (Surge) 28V 0.6 W 0% (seconds)
5V 0.1W
* Power is needed to operate PBEX telemetry unit during battery discharge
The SC shall provide TBD W to PBEX during all contingency operations.
PBEX will be capable of providing up to TBD Amp-hours of power at 28 6V. Nominally, PBEX will dissipate this power through an internal resistive load during discharge cycles. However, the SC Contractor may elect to have this power dissipated to the SC for use by the SC subsystems, but may not hold the Experimenter or their agents liable for any damage this configuration may cause.
Input/Output Signal Interfaces
The SC shall provide a RS-422 interface with the PBEX.
Not applicable.
Analog Interfaces
The SC shall provide a connection for one analog output from PBEX. SC Contractor shall define the analog output based on the requirements stated in Section 6.3
The SC shall transmit real-time and/or stored commands to PBEX via the RS-422 interface (See Section 4.2.1). The SC Contractor shall provide either a PC-based SC simulator, or information on the interface (command formats, interface design, etc.) to allow the experimenters to develop a PC-based command and data bus simulator.
The SC shall transmit real-time commands to PBEX within one second after receiving the command. The SC shall accept real time commands at a rate no faster than one command per second
The SC shall transmit stored commands to PBEX within one second of the scheduled execute time. The SC shall store up to TBD bytes of commands for execution.
Command List
The SC shall handle seven 8 bit commands for transmission to PBEX:
Charge battery A
Charge battery B
Charge batteries A and B
Discharge battery A
Discharge battery B
Discharge neither
Load disconnect
Not applicable.
Not applicable.
The SC shall be able to command each PBEX power line switch to on or off. The SC shall also transmit experiment data to a receiving ground station on command. The SC Contractor shall provide a history of all SC commands issued to PBEX, including any errors received.
Clock/Time Reference Requirements
The SC shall execute scheduled PBEX commands and measure the execution time of PBEX commands within 100ms of the UTC reference time.
The SC shall receive telemetry from PBEX via the RS-422 interface (See Section 4.2.1). The SC shall provide data storage as specified in Section 6.1.1 below, since PBEX has no inherent data storage capability.
Experiment Data Transfer and Storage
The SC shall accept experiment data from PBEX on demand, but at a rate no faster than 150 bits per second. The SC shall time tag experiment data within one second of receiving the data. The SC shall collect and store up to 2 kilobits/orbit of experiment data for 24 hours.
The SC shall collect the telemetry points listed in Table 6.1-1:
Table 6.1-1: PBEX Telemetry Points
Telemetry Point Length (bits) Frequency (Hz) ILOAD 8 1 IBATTERY 8 1 VBATTERY 8 1 TBATTERY 8 1
The SC Contractor shall limit the bit error rate for experiment data to 1x10-6 from the interface with the experiment to delivery to the Ground Control Station.
Not applicable.
The SC Contractor shall provide one thermistor to be placed on the PBEX base plate. The Experimenter will place the thermistor and terminate the output in the 15 pin AMP double density connector (See Section 3.2). The thermistor shall be calibrated to measure temperatures from -TBD to +TBD C. The SC shall sample the measurement at least once each 15 minutes, with an accuracy of TBD C.
The SC Contractor shall provide a time history of the input power on the 28V line to PBEX. Input power shall be measured at TBD sec intervals.
Clock/Time Reference Requirements
The SC shall time tag experiment and PBEX related SC data within 100 ms of the UTC reference time.
The SC shall limit the static load on PBEX to the levels in Table 7.1-1 below. The SC Contractor shall not use PBEX to carry loads or to support other SC or other experiment structural members.
Table 7.1-1: PBEX Static Load Limits
Spacecraft Load Limits Axis (g) x TBD y TBD z TBD
The SC shall limit the random vibration at the SC-to-PBEX interface to the levels in Table 7.2-1 below.
Table 7.2-1: SC-to-PBEX Random Vibration Limits
Frequency (Hz) Power Spectral Density
(G2/Hz)
TBD
- Shock Constraints
The SC shall limit the shock at the SC-to-PBEX interface to the levels in Table 7.3-1 below.
Table 7.3-1: SC-to-PBEX Pyroshock Limits
Frequency (Hz) Acceleration
(g's)
TBD
The SC shall limit PBEX radiation exposure to 100,000 RAD[Si] of ionizing radiation over a three year period.
PBEX is a DC experiment, with no radiated emissions (within experimental uncertainty).
Conducted Emissions from Experiment
The SC shall withstand conducted emissions to the levels in Table 7.5-1 below.
Table 7.5-1: Conducted Emissions from PBEX
Frequency (Hz) Amplitude (A) TBD TBD
Magnetic Fields Generated by Experiment
The SC shall withstand a magnetic field with a strength up to 5 microteslas at 1 meter from TBD.
Sensitivity of Experiment to Radiated Emissions
The SC shall limit radiated emissions at any surface of PBEX to the values listed in Table 7.5-2.
Table 7.5-2: PBEX Sensitivity to Radiated Emissions
Frequency (Hz) Amplitude (dBV/m) TBD TBD
- Sensitivity of Experiment to Conducted Emissions
The SC shall limit conducted emissions into PBEX to the values listed in Table 7.5-3.
Table 7.5-3: PBEX Sensitivity to Conducted Emissions
Frequency (Hz) Amplitude (A) TBD TBD
- Sensitivity of Experiment to Magnetic Fields
The SC shall limit magnetic fields in the vicinity of PBEX to the values listed in Table 7.5-4.
Table 7.5-4: PBEX Sensitivity to Magnetic Fields
Frequency (Hz) Amplitude
(picoteslas)
TBD TBD
- Atmospheric Pressure Constraints
SC Contractor shall ensure that atmospheric pressure and decompression rates to which PBEX is exposed during integration, test, and shipping do not exceed levels expected during launch or orbital operations.
The SC Contractor shall ensure PBEX is kept at cleanliness levels equal to or better than the SC. The Contractor shall coordinate cleaning procedures (wipe-downs, bake-outs, etc.) with the Experimenter before proceeding with any such action.
The SC Contractor shall ensure PBEX is maintained in a humidity environment that limits electrostatic discharge and avoids condensation.
Thermal Interface Requirements
The SC shall limit the total influx of thermal energy by all mechanisms (radiation, conduction, reflection, etc.) to TBD W/cm2
Thermal Dissipation
The SC shall conduct the expected thermal dissipation of PBEX (500 mW maximum thermal power) way from PBEX through the experiment's mounting plate, or shall propose alternate methods of thermal control for the Experimenter's approval.
During nominal operations, the SC shall maintain PBEX temperature within the allowable operating temperature ranges listed in Table 7.9-1. During contingency operations, the SC shall maintain PBEX temperature within the allowable survival temperature ranges listed in Table 7.9-1.
Table 7.9-1: PBEX Temperature Limits
PBEX Allowable Operating Allowable Survival Operating Mode Temperature Range Temperature Range Operating -35 to +35 deg C N/A (Charging) Standby -35 to +35 deg C N/A (Discharging) Unpowered N/A -45 deg C to TBD
The Contractor shall ensure that all requirements in this document are satisfied during handling on the ground. PBEX has no additional ground handling requirements.
Experiment Inspection Procedures
The Experimenter will develop inspection procedures for PBEX. The Contractor shall comply with inspection procedures, and shall grant the Experimenter access to PBEX for inspections as requested.
Experiment Integration Procedures
The Contractor shall coordinate with the Experimenter to develop proper procedures for integrating PBEX to the SC.
Experiment Power On/Off Procedures
The Experimenter will develop power on/off procedures for PBEX for integration and test activities. The SC Contractor shall comply with power on/off sequences provided by the Experimenter
Experiment State of Health Checks
The Experimenter will develop a telemetry data dump sequence to perform periodic state of health checks for PBEX during integration and test activities. The SC Contractor shall comply with the telemetry data dump sequences provided by the Experimenter. The Experimenter will process and evaluate the data for these checks.
Ground Support Equipment (GSE)
The Experimenter will provide all GSE necessary to support PBEX inspections and state of health checks during integration and test. The GSE will include either a SC Contractor-provided simulator or a PC with a customized board to simulate the SC (See Section 5), and a printer.
Spacecraft Integration and Test
After receiving PBEX from the experimenters and prior to integration to the SC, the Contractor shall support a visual inspection of PBEX and a telemetry data dump.
Post Spacecraft Integration Test Requirements
Following integration to the SC and following each test of the SC which includes PBEX, the Contractor shall support a visual inspection of PBEX and a telemetry data dump (described in Section 8.1.5).
Ground Support Equipment (GSE) and Facilities
PBEX requires no additional GSE during SC integration and test beyond that described in Section 8.1.6. However, the Contractor shall provide the Experimenter with access to a phone, a desk and electrical outlets to support the PC and a printer. The Experimenter also desires Internet access, if available.
The Contractor shall provide reasonable access to PBEX during SV integration and test to replace the batteries, if necessary.
Should SV storage become necessary, the Contractor shall notify the Experimenter. PBEX will discharge over periods of inactivity, but this will not harm the experiment. The Contractor shall ensure PBEX storage temperatures do not exceed +75 C. After removing PBEX from storage, the Contractor shall support a telemetry data dump as described in Section 8.1.5.
Launch Vehicle (LV) Integration and Test
Following SV arrival at the launch vehicle integration site, The SC Contractor shall support a PBEX telemetry data dump. The Contractor shall also support subsequent telemetry data dumps throughout the launch vehicle integration process at times to negotiated by the Contractor and the Experimenter.
LV Integration Site GSE and Facilities
PBEX requires no additional GSE during LV integration and test beyond that described in Section 8.1.6. However, the Contractor shall provide the Experimenter with access to a phone, a desk and electrical outlets to support the PC and a printer. The Experimenter also desires Internet access, if available.
The SC Contractor shall support one PBEX telemetry data dump after the SV is integrated with the LV, as late as possible before launch.
PBEX has no additional requirements for the launch pad environment, provided that all other requirements in this ERD are satisfied.
The Contractor shall provide reasonable access to PBEX to replace the batteries if necessary.
PBEX has no requirements for Launch Go/No-Go criteria
Potentially Hazardous Materials & Equipment
PBEX does not contain any pressurized systems.
PBEX does not contain any ordnance systems.
PBEX does not contain any radiation sources.
PBEX does not contain any high voltage sources.
PBEX does not contain any explosive, corrosive, or toxic battery material.
ON-ORBIT OPERATIONS REQUIREMENTS
PBEX shall be powered off during ascent.
The SC shall maintain the PBEX temperature within the survival temperature range stated in Section 7.9.3. Provided this requirement is satisfied, PBEX may remain unpowered during SC check-out.
The Experimenter will develop power on/off procedures for PBEX for on-orbit operations. The SV Operator shall comply with power on/off sequences provided by the Experimenter. The SV Operator shall ensure the PBEX temperature is within the operating temperature limits (See Section 7.9.3) before applying power to the unit.
The SV Operator shall begin PBEX initialization within 24 hours after the completion of SC check-out. The SV Operator, and the Experimenter shall negotiate the proper initialization procedure. The SC shall support the initialization procedure.
The SC shall begin collecting telemetry from PBEX immediately after initialization. The SV operator shall downlink PBEX telemetry between TBD and TBD hours after initialization. The SV Operator shall make the collected telemetry available for download by the Experimenter within TBD hours after receipt at the ground station.
The SC shall operate PBEX continuously during normal SC operations. The SC shall command PBEX to alternate between one charge/discharge cycle per orbit from initialization to end of mission life. The SC Contractor, the SV Operator, and the Experimenter shall negotiate deviations from this profile as required.
Contingency Experiment Operations
For purposes of this document, contingency operations include all SC modes which require PBEX to be powered off. The SV Operator shall notify the Experimenter when PBEX is turned off, and when it is turned on again.
None required.
Data Return, Processing, and Distribution
The GCS shall automatically format time-tagged PBEX telemetry and temperature into a TBD spread sheet file. The GCS shall have the capability for the Experimenter to remotely access the file (e.g., a dial-in bulletin board).
None required.
ON-ORBIT ORIENTATION AND STABILIZATION
PBEX has no attitude control requirements.
PBEX has no attitude knowledge requirements.
PBEX has no requirement for orbit ephemeris predictions.
PBEX has no post-processed ephemeris knowledge requirements.
The following deliveries must be accomplished to successfully integrate PBEX to the SC:
Table 12.1-1: Deliverables for PBEX Mission
Deliverable From To Date Required Thermistor SC Contractor Experimenter TBD SC Simulator SC Contractor Experimenter Interface Control Document SC Contractor Experimenter Wooden mock-up Experimenter SC Contractor Mass model Experimenter SC Contractor Electrical load simulator Experimenter SC Contractor Thermal model Experimenter SC Contractor Experiment-to-SC interface Experimenter SC Contractor simulator Engineering model Experimenter SC Contractor Operational inputs Experimenter SV Operator Flight Operations Manual SV Operator Experimenter TBD
All elements of the PBEX program are unclassified.
DC Direct Current
LV Launch Vehicle
N/A Not Applicable
NTE Not To Exceed
OAP Orbit Average Power
PBEX Polymer Battery Experiment.
SC Spacecraft
SV Space Vehicle
UTC Universal Time Coordinate
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