SOW.pdf

Puncture Disk Microvalve Development Statement of Work

1. Objective/Requirements

1.1 Scope

This statement of work (SOW) defines the effort to be contracted in support of the Goddard Space Flight Center (GSFC) Venus Mass Spectrometer (VMS) Instrument Project for the design, build, and test of a prototype Puncture Disk Microvalve (PV).

Successful testing of a prototype PV in a laboratory environment is the goal of this effort.

Additional testing of the prototype PV in a flight like environment is not part of the scope of this contract. It is required that the PV be based on the proven Microvalve design as much as possible to minimize the effort needed for the development cycle.

1.2 Puncture Disk Microvalve Description and Operation

The PV will be used to hermetically seal the VMS Gas Processing System from the time of ground integration closeout until entry into the Venusian atmosphere. The VMS PV assembly shall have two commanded states “Open” and “Closed”. The initial “lance” (or pintle) configuration is “open” with the foil seal (or rupture disk) used to create a hermetic seal intact. VMS currently plans to use four PV assemblies (TBC) and each PV is integrated into the instrument system in the “open” foil seal intact state. All of the PV foil seals will remain intact throughout ground testing to keep the VMS and Venus Tunable Laser Spectrometer (VTLS) Gas Processing System hermetically sealed under internal vacuum. The PV assemblies remain in this sealed configuration throughout instrument system level testing, through launch, and cruise phases of DAVINICI mission.

Figure 1 Notional Puncture Valve Assembly

After approximately 2 years the DAVINCI spacecraft will reach the planet Venus, and the Descent Sphere containing the VMS instrument will be deployed. During the descent to the surface, each of the PVs will be individually commanded (TBC) to the “Closed” state so that the PV lance punctures the hermetic foil seal. Once the seal is punctured, the lance will be individually commanded (TBC) to return to the “Open” position to allow

Foil seal

Platinum seal

“la nc e” the Venus atmosphere into the instrument through the Gland Nut Port (see Figure 1 - item #5).

1.3 Management, Reporting, Documentation and Reviews

1.3.1 Management

The Seller shall designate a single individual who will be given full responsibility and authority to manage and administer all phases of the work specified by the contract and ensure that all objectives are accomplished within schedule constraints.

The Seller shall designate and identify by name a single individual who shall serve as a point of contact with the GSFC Contracting Officer Representative (COR) for all technical aspects of the PV contract.

The Seller shall provide for managing all resources, controlling schedules, managing all engineering, manufacturing and procurement activities, configuration management, Quality Assurance, documentation control, and distribution.

The Seller’s Program Management function shall provide to the Buyer reporting and at least monthly insight into program status, as well as technical and programmatic performance of all of the Seller’s responsibilities performed under this contract. The Seller shall prepare and submit monthly status reports.

1.3.2 Reviews and Meetings

Any reviews specified here may be combined as proposed by the Seller. Any combined reviews shall meet the requirements of each included review.

The Seller shall prepare, conduct and present the following reviews at its site at a time mutually agreed upon with the Buyer. The meeting shall be conducted in a “hybrid” fashion allowing for both in-person and remote attendance. Remote attendance shall be facilitated through the use of remote conference software such as Microsoft Teams. The Buyer reserves the right to attend any of the reviews in-person or remotely including the Seller’s peer reviews and requires notification ten (10) working days prior whenever practical.

All of the reviews, with the exception of the Kick-Off Review, the Monthly Status Meetings, Test Readiness Reviews, and Engineering Peer Reviews, will be chaired by the Buyer. The action items that result from these reviews shall be documented by the Seller and made available to the Buyer. If any deficiencies are found at the reviews, the Seller shall be required to develop a corrective action plan. The Seller shall present at each review the status of all open action items up to that point in the implementation, with the corrective action or resolution for each item.

The Seller shall support the reviews and meetings described in the following sections

1.3.2.1 Kick Off Review (KOR) Requirements

The Seller shall host a Kick-Off Review in order to present for review the plans, schedules, and activities required to meet the development plan. The agenda and information to be presented shall be coordinated with the Buyer prior to the meeting, and will largely be based on the Seller’s offer.

1.3.2.2 Preliminary Design Review (PDR) Requirements

The Seller shall prepare and conduct a Preliminary Design Review (PDR) describing the current PV design concept. The objective of this review is to present the preliminary status of the drawings, analyses, and engineering model development to show the approach meets the final performance and interface specifications. Preliminary calculations for mechanical loads, stress, torque margins, thermal performance, and expected lifetime shall be presented.

1.3.2.3 Critical Design Review (CDR) Requirements

The Seller shall prepare and conduct a Critical Design Review (CDR) and shall present a final detailed design using substantially completed drawings, analyses, and breadboard/engineering model verification test results to show that the design shall meet the final performance and interface specifications and the required design objectives.

Changes required to the design from the PDR shall also be included. Final calculations for mechanical loads, stress, torque margins, thermal performance, and expected lifetime are to be presented.

1.3.2.4 Test Readiness Review (TRR) Requirements

The Seller shall prepare and conduct Test Readiness Reviews (TRRs), for the prototype test, no earlier than one week prior to the start of the subject test. The Seller shall demonstrate that all test planning, scheduling, facilities, procedures, GSE, and documentation are ready for the subject test. The seller shall make available copies of the test plan and procedures for review by the buyer. The Seller shall present the pre-test configuration and status of the PV to be tested, identify all anomalies, problem reports, deviations, waivers, and could-not-repeats.

1.3.2.5 Peer Review Requirements

The Seller shall convene peer reviews on mutual consent with the Buyer’s request, to explore and resolve issues related to prototype design, analysis, and performance. The Buyer will also request peer reviews on parts, materials, processes, and testing, as needed. The goal of a peer review is to familiarize the participants with all the relevant details, reach consensus on plans, tasks, and solutions, and in general prepare a coherent Seller-Buyer position on all relevant elements prior to formal presentation at a major GSFC VMS instrument review.

All Peer Reviews held shall be documented and be made available to the Buyer at the Seller’s site. The Buyer shall be invited to attend and or participate in all Peer Reviews.

The Seller shall identify and track all actions assigned at peer reviews.

1.3.2.6 Technical Interchange Meetings (TIM) Requirements

The Seller shall convene and support Technical Interchange Meetings (TIMs) to be held at the seller facilities, at the mutual consent of the participants. These TIMs shall support review and coordination of technical issues including, but not limited to, parts, test plans, test procedures, design modifications, and design analyses. The Seller shall identify and track all actions assigned at TIMs.

1.3.2.7 Monthly Status Meeting Requirements

The Seller shall prepare and deliver the monthly status in a presentation that includes status of all work being performed including appropriate metrics, detailed status of the schedule, milestone monitoring, risk list with probability and consequence ranking to represent the greatest threats to success and associated mitigations, changes to design parameters, resource allocation and margins, and non-conformance and failure reports.

The presentation shall be a summary of the period's progress, problem areas, and activities on-going and planned.

1.4 Milestone Payments

1.4.1 Milestone 1: Completion of Critical Design Review

Upon successful completion of the CDR as determined by the review chair, the buyer shall disburse a payment of 25% of the contract value to the seller.

1.4.2 Milestone 2: Completion of Test Readiness Review

Upon successful completion of the TRR as determined by the review chair, the buyer shall disburse a payment of 25% of the contract value to the seller.

1.4.3 Milestone 3: Completion of the Prototype Test & Test Report Delivery

Upon completion of the prototype testing activities including any minor test iterations agreed upon by the buyer and seller and delivery of a test report detailing the results of the test program including the final version of the verification matrix, the buyer shall disburse the balance of the contract value to the seller.

2 Requirements

2.1 Puncture Disk Microvalve Operational and Performance Requirements

Each puncture disk microvalve (PV) shall meet the following operational and performance requirements:

a) With the foil seal intact, the (external) puncture valve seat leak rate shall be less than 1 x 10-10 atm-cc/sec for Helium after continuous exposure to helium for 5 minutes across the foil seal.

b) The outer case and internal puncture valve parts having vacuum interfaces, such as braze joints, welds, and the bellows assembly, and foil seal, shall have a leak rate less than 1 x 10-10 atm-cc/sec for Helium after continuous exposure to helium for 5 minutes.

c) The coil to case resistance shall be > 2G at 250Volts. (This is a high impedance, high potential requirement.)

d) The hot operational temperature of the PV assembly over the mission will be approximately at least 140 C over 65 minutes TBC (GSFC thermal analyst to determine thermal gradient due to heat soak)

e) The operational lifetime of the actuating the PV to puncture the foil seal will be approximately 1 cycle at ~140 C TBC (setpoint)

a. qualify that the valve shall operate NN number of times (robustness)

b. qualify at approximately TBD cycles at TBD temp. (qual temp)

c. life test TBD

f) The foil seal with a vacuum on its internal surface shall be remain intact for the following external pressure delta conditions: Venus atmospheric pressure (pressure equivalent to ~39km above surface of Venus TBR + dynamic pressure due to freefall TBD), vacuum of space, and Earth sea level pressure (GSFC to supply values)

g) The PV including the foil seal shall be made of Venus atmospheric compatible material (Ti TBC) note: approved material list shall be provided by VMS

h) The open and closed actuation time shall be < 5 msec.

i) The survival temperature shall be from -55 C to + 210 C TBC (VMS will also need a qual range; and bake out spec, note: DraMS indicates 250 C)

j) The PV shall be able to be commanded so the lance/pintle punctures the foil seal

(“Close” position) and then shall be able to be separately commanded to retract the lance to valve (“Open” position).

k) The puncture valve lance shall be held “open” above the foil seal TBD distance above and not “move” during all mechanical disturbances (note: microvalve open distance is 0.030”)

l) The puncture valve shall puncture/lance “Close” position at TBD force with margin to break the foil seal

m) The foil seal shall be broken so as not to reduce the gas conductance more than TBD flow rate (GPS lead’s analysis; will combine each inlet needs into one req)

n) The lance/puncture retraction force (“Open” position) shall be TBD force with margin (to ensure there is no FOD and has opened)

a. TDB “Open” clearance requirement?

o) The puncture valve assembly may have a position sensor (TBR)

p) The lance open/close position shall be measured (mechanical movement indicator) OR can we read the position within TBD range to know the valve is open or closed

q) The puncture valve shall be able to withstand DAVINCI launch loads in the Open position.

r) The puncture valve shall be able to withstand DAVINCI and Descent Sphere shock loads in the “Open” position

s) The quasi-static limit load for the microvalves shall be TBS g.

t) The random vibration input load for the microvalves shall be the amplified TBS g

RMS value resulting from the DAVINCI input of TBS g RMS.

u) The mass of each puncture valve shall be less than or equal to TBS grams. (note:

microvalve is 25g)

v) The solenoid actuator assembly shall be removable from the valve body so the valve body can be baked at a higher temperature TBD (if we need this requirement?).

w) The overall length of each puncture valve shall be less than TBD (note:

microvalve is 1.75 in – note: no hard constraint on overall length) inches

x) The diameter of each puncture valve body shall be less than TBD inches (note:

microvalve is 0.6).

y) The puncture valve must be able to survive at least 12 bakeout cycles at an upper temperature of + 275 C TBC (for three hours) with the solenoid removed while still maintaining the above performance requirements.

z) After puncturing the foil, the puncture valve must be able to survive ~90 atm of internal pressure (Venus surface pressure) with vacuum on the exterior of the valve body

2.2 Requirements Verification

The seller shall develop a Verification Matrix (VM). The Verification Matrix shall summarize the flow-down of system requirements verification. The VM shall stipulate how each requirement will be verified, and summarizes current status of compliance/non-compliance with requirements. The VM shall list a summary description of each requirement, and a summary of the measured/analyzed/demonstrated performance of the system against each requirement. It shall show each Requirements Document, requirement reference source (to the specific paragraph or line item), the method of compliance, applicable procedure references, report reference numbers, etc. for each requirement set from the Requirements Document.

Verification methods shall include:

Inspection: Designated as (I) and represents inspection of the physical hardware by a customer appointed qualified inspector for compliance.

Analysis: Designated as (A) and represents documentation of performance or function through detailed analysis using all applicable tools and techniques.

Test: Designated as (T) and represents a detailed test of performance and/or functionality throughout a properly configured test setup where all critical data taken during the test period is captured for review.

Demonstration: Designated as (D) is the actual operation of an item to provide evidence that it accomplishes the required functions under specific scenarios.

In-process production evaluation tests and environmental stress screening tests shall also be considered to be verification tests.

The seller shall present the current status of the verification matrix at each review.

3. Place of Performance

Mindrum Precision facility in Rancho Cucamonga, CA

4. Period of Performance Development shall be performed 15 months ARO.