SOW (No Restrictions).pdf

Volatiles Investigating Polar Exploration Rover (VIPER) Direct Field Acoustic Test

(DFAT) Expert Services

Statement of Work

1.0 Introduction

The National Aeronautics and Space Administration (NASA) Johnson Space Center (JSC) is seeking expert services for vibroacoustic testing of the VIPER Surface Segment space vehicle. This

Statement of Work (SOW) describes the requirements to perform Direct Field Acoustic Testing

(DFAT) at JSC in Houston, Texas, during the last quarter of calendar year 2022. Vendors are requested to provide a Quote for support services, test execution and post-test reporting with the understanding that the final reference data will be provided after the Critical Design Review (October

2021). VIPER is a robotic mission that will be launched to the Moon, currently scheduled for

November 2023.

2.0 Objectives

The main objective of this contract is to secure vibroacoustics test expertise to perform Protoflight acoustic testing of the VIPER flight unit, using mature DFAT technology. The contractor shall have demonstrated experience providing services on similar spacecraft hardware and to the sound pressure levels defined in this statement of work (SOW).

3.0 Scope of Work

3.1 The DFAT shall be performed on the VIPER Surface Segment flight hardware to demonstrate vehicle capability margin over the launch and ascent acoustic environments and assure a satisfactory workmanship screen of the assembly, in accordance with VIPER-MSE-PLN-011 VIPER System Acoustic Test Plan (Attachment

A and B).

3.2 The Contractor shall provide the test hardware required to perform the DFAT, including but not limited to:

• Speakers

• Amplifiers

• Control Microphones

• Data Cables

• Provisions for microphone placement (stands, cables)

• System power (generator and power cables)

3.3 The Contractor shall perform on-site acoustic testing at the NASA Johnson Space

Center, Houston, TX, including:

• Test equipment unpacking, setup and checkout

• Test execution

• Test Equipment disassembly and packing

3.4 Acoustic Test Environments

The Contractor shall test at sound pressure levels (SPL) for a duration of two minutes, as specified in Table 1, Table 2 and Figure 3.

Table 1: Protoflight Acoustic Test Levels

Center Frequency (Hz) Protoflight SPL dB

(ref 2.0x10-5 Pa)

31.5 128.0

40 129.5

50 129.5

63 128.5

80 128.0

100 127.5

125 127.0

160 126.5

200 126.0

250 125.0

315 123.5

400 121.5

500 119.5

630 117.5

800 115.0

1000 112.5

1250 111.0

1600 110.0

2000 109.0

2500 108.0

3150 107.0

4000 106.0

5000 105.0

6300 104.0

8000 103.0

10000 102.0

OASPL 138.19

Duration (sec) 120

Figure 4: Protoflight Acoustic Test Levels

Table 2: Test Tolerances

Test Parameter Test Tolerance

Sound Pressure Levels 1/3-Octave Center Frequencies

≤ 40 Hz 40 to 3150 Hz ≥ 3150 Hz Overall SPL

+3 dB, -6 dB ± 3.0 dB

+3 dB, -6 dB ≤1 dB

Minimum Statistical Degrees of Freedom 100

Duration +10%, -0%

3.5 Calibration

3.5.1 The facilities and fixtures used in conducting tests shall be capable of producing and maintaining the test conditions prescribed with the test article installed and operating or not operating, as required.

3.5.2 The test configuration and performance shall be verified prior to the test either by a review of its performance during a test that occurred a short time earlier or by conducting a test with a substitute test item.

3.5.3 All equipment used for tests shall be in current calibration and indicated on the equipment (e.g., tags, stickers).

3.5.4 The Contractor shall provide measurements that are certified traceable to National

Institute of Standards and Technology (NIST)

3.6 The Contractor shall perform the acoustic test on-site at JSC in accordance with the

VIPER-SIT-PLN-007 VIPER SI&T Local Contamination Control Plan (Attachment D).

3.7 The Contractor shall conduct meetings with NASA to discuss facility accommodations, fixturing, contamination control, scheduling, logistics, and other relevant information required to support the acoustic test.

3.8 The Contractor shall specify support accommodations that are required to be provided by

NASA in order to perform the acoustic, such as:

• Logistics support

• Installation

• Facility requirements

• Electrical requirements

• Lifting Equipment

• Tools and Equipment

3.9 The Contractor shall perform a safety assessment of the test configuration and identify potential hazards that will need to be mitigated or controlled during test set-up, checkout, execution, and disassembly.

3.10 The Contractor shall provide a schedule for conducting all activities associated with the planning, delivery, set-up, execution, tear-down, and return of all equipment required to perform the acoustic testing.

4.0 Government Furnished Data

4.1 The following Reference Data provides the information for the Surface Segment. The

Contractor should provide a Quote with the understanding that the final Reference Data, will be provided after award Attachment A: VIPER-MSE-PLN-011 VIPER System Acoustic Test Plan

Attachment B: Acoustic Test Conceptual Configuration Layout Diagrams and Facility

Pictures Attachment C: VIPER-MSE-SPEC-002 VIPER Coordinate Frame Definition Attachment D: VIPER-SIT-PLN-007 VIPER SI&T Local Contamination Control Plan

5.0 Government Provided On-Site Equipment and Provisions

5.1 NASA Johnson Space Center will provide the following equipment in order to perform the acoustic test:

• The VIPER Surface Segment space vehicle (test article)

• Acoustic Test Stand

• Test Article Instrumentation (Accelerometers)

• Data Acquisition System for Accelerometers

• Standard facility power

5.2 NASA Johnson Space Center will provide personnel and operate equipment, as required, to maneuver and provide accessibility to the Contractor in order to perform the acoustic test on-site at JSC.

5.3 NASA Johnson Space Center will make available space in a Controlled Work Area that is in compliance with the VIPER-SIT-PLN-007 VIPER SI&T Local

Contamination Control Plan (Attachment D) to the Contractor for set-up and performing the acoustic test.

5.4 NASA Johnson Space Center will make available typical hand tools and electrical tools, nominally found in a shop. Specific Contractor needs will be discussed with

NASA, as required.

6.0 Deliverables and Deliverables Schedule

6.1 DFAT Test Plan – to be delivered 180 days prior to test execution

6.2 Sound Stack Installation and Operation Safety Assessment – to be delivered 120 days prior to test execution

6.3 DFAT Operating Procedures – to be delivered 90 days prior to test execution

6.4 Basic Post-Test Report – to be delivered within 30 days of test completion

6.5 Microphone Data Time Histories and Acoustic SPL in ASCII text format, to be delivered immediately after completion of test

7.0 Period of Performance/Schedule

7.1 The contractor shall provide a proposal for the Initial Planning period and the Final

Planning and Execution period as follows:

• Initial Planning: Authority to Proceed through August 31, 2022

• Final Planning and Execution: September 1, 2022 through March 30, 2023

(delivery of the DFAT Test Results)

8.0 Travel

8.1 The Contractor shall travel to NASA Johnson Space Center, Houston, TX, as required, to support planning, such as facility inspections and assessments.

8.2 The Contractor shall travel to NASA Johnson Space Center, Houston, TX in order to support on-site acoustic testing, including:

• Test equipment unpacking, setup and checkout

• Test execution

• Test Equipment disassembly and packing