JSC_Data_Acquisition_System_SOW_RevD.docx

Statement of Work

Structural Dynamics Data Acquisition System

Background

The Structural Engineering Division (SED) at NASA Johnson Space Center (JSC) performs numerous structural dynamics testing supporting the major NASA programs including International Space Station (ISS), Space Launch System (SLS), Multi-Purpose Crew Vehicle (MPCV), commercial cargo, and commercial crew. Currently SED has three separate large vibration labs, a panel acoustic test lab, and also performs modal testing and miscellaneous testing as required in the SED facilities as well as other facilities on-site and off-site. In addition, of these various types of tests performed, multiple types of sensors are employed and will need to be conditioned, including IEPE accelerometers and microphones, charge devices, and constant voltage devices such as load cells and DC accelerometers, and strain gauges. The purpose of this Statement of Work (SOW) is to procure a data acquisition system that is reconfigurable and very portable to support all the SED testing needs. In addition, the intent of SED is to borrow or lend additional channels and technician support with NASA Marshall Space Flight Center (MSFC) when needed to support larger tests such as the SLS modal and roll-out tests or Orion MPCV AA2 test. In order to do this, the system must be able to use the existing data acquisition system modules at MSFC, which are Bruel and Kjaer LAN-XI Data Acquisition System modules. It is the intent of NASA to standardize the data acquisition systems and procedures for structural dynamics groups across centers as much as practical. This standardization will provide cost savings for high-channel count tests, as well as due to the sharing of procedures, processes, and data. Proposed systems will be evaluated most heavily on its ability to provide seamless integration with the existing Bruel and Kjaer LAN-XI Data Acquisition systems at NASA MSFC.

Evaluation of the ability of the proposed solutions to efficiently visualize and manage large amounts of data will be of high priority. Because flight hardware is tested in these labs, the test procedures and data acquisition system hardware and software will be subjected to stringent Quality, Safety, and Mission Assurance criteria. These factors necessitate that the proposed system be a specialized hardware and software package that has a proven track record in industry. It is required that the proposed solution and vendor have acceptable aerospace experience in high channel count installations that impart controlled forces on critical flight hardware. The experience considered will include recent (5 years) repeatable exercises of large channel count data acquisition, force and response monitoring, emergency shutdown, and utilizing multiple simultaneous shakers. The vendor shall also be ISO 9001 certified.

The proposed solution should be expandable and exhibit the ability to acquire data from up to 1,000 response channels and provide 4 different excitation signals simultaneously. The proposed solution should also be able to efficiently handle the same amount of data from a data monitoring and evaluation perspective both during the test and post-test. Multi-monitor data viewing and channel status monitoring for the potential 1,000 channel configuration is desirable.

The system will also serve as a day-to-day data acquisition and analysis system for the foreseeable future. Strength and longevity are a requirement and will be weighed by metrics such as past performance in hardware stability, future hardware availability, software support including technical updates, and the degree of available training. The proposed software solution shall possess a perpetual software license with a single or multi-year maintenance agreement options and have guarantee of supporting future releases of Windows operating systems. Software maintenance and costs in out years will be considered.

System Description

Hardware

This is a request for proposal for a structural dynamics data acquisition hardware system with at least 225 input channels and 4 source output channels. The delivered system must be able to be distributed in a master/slave configuration to a minimum of 7 different locations each separated by 100 feet apart. The intent of JSC SED is to locate the data acquisition hardware close to the test article to minimize sensor cable lengths, but locate the computer running the system and displaying data in a more remote location. The system must also be able to be re-configured in at least 3 separate and independent systems. A system architecture that consists of independent multi-channel modules that can be operated independently or assembled into a chassis is required in order meet the requirement to be re-configurable and portable. JSC SED’s intent is to procure computers to run the system and any necessary internet routers/switches in a separate procurement. Any current hardware owned by JSC SED that is compatible with the proposed system can be counted as part of the proposed solution.

Software

Data acquisition software that includes sensor and data acquisition system setup, real-time channel health and time history display and near-real-time frequency domain calculation and display, and time history data recording. Analysis software shall include Single Input Multiple Output (SIMO) and Multiple Input Multiple Output(MIMO) Frequency Response Function (FRF) analysis, Stepped-sine FRF processing, Power Spectral Density (PSD), Octave Band processing, and include a means to automate the reporting of the analysis results. Software licensing must support 2 simultaneous users of data acquisition/display/recording capability, and a 3rd user for post-processing analysis. This licensing and the delivered hardware shall support a minimum of 2 independent and simultaneous tests. Any current software owned by JSC SED Team that is compatible with the proposed hardware can be counted as part of the proposed solution.

Vendor Requirements

The vender shall meet the following requirements.

V1. ISO9001 certified V2. Primary provider of support and maintenance to both the hardware and data acquisition and data analysis software (no 3rd party software).

V3. Provide data acquisition and data processing under one GUI system V4. Provide 24 - 7 support for both hardware and software V5. Provide hardware calibration services V6. Provide on-site training services V7. Provide urgent hardware substitution for faults identified within warrantee.

V8. Provide timely software patches to address software issues that prevent successful test execution.

Hardware Requirements

The data acquisition hardware shall meet the following requirements:

H1. System shall be able to be combined with the existing Bruel and Kjaer LAN-XI Data Acquisition System modules from NASA MSFC to expand the system with time data sample synchronous acquisition capability that meets requirement H15 in order to integrate into modal testing and other structural dynamics testing.

H2. An accredited calibration of the system shall be delivered with the system.

H3. A detailed set of requirements for computer and internet router/switch to allow the system to meet all requirements in this RFP shall be provided in the proposal.

H4. The system as delivered will be configurable in a master/slave configuration with at least 7 modules with at least 100 feet of separation between modules.

H5. System shall be expandable to a total input channel count of a minimum of 1000 channels.

H6. Minimum of 3 chassis, each capable of being used independently or connected as one system.

H7. System chassis-to-chassis and module-to-module communication, synchronization, and data transfer to computer shall be via Ethernet.

H8. System shall support a computer to chassis distance of at least 100 feet.

H9. Chassis shall support a chassis to chassis distance of at least 100 feet.

H10. System shall be compatible with nominal 120V, 60Hz power.

H11. Modules shall have option to be powered through Ethernet connection (PoE IEEE 802.3af).

H12. Modules shall have option to be powered by battery.

H13. System shall include rechargeable batteries sufficient to power at least one module with a minimum capacity of 90 watt-hours.

H14. Front-end control using a Windows 64-bit Laptop or PC.

H15. Minimum throughput to disk of 17 MS/s.

H16. Phase difference between any 2 channels for a system with up to 1000 simultaneous channels: < ±0.5 ° at 2 kHz and <±4 ° at 25.6 kHz.

H17. Phase difference between any 2 channels within a chassis: < ±0.4 ° at 2 kHz and <±2 ° at 25.6 kHz.

H18. Input channels shall meet the following minimum specifications:

H18.1. Input connector type is optional, but BNC is preferred (10-32 microdot and ¼-28 4-pin Microtech connector for triax accelerometer are desired for up to 36 channels. Interchangeable faceplates allowing for different connector types desireable).

H18.2. Integrated Electronic Piezoelectric (IEPE) conditioning support for a minimum of 204 of the 225 channels.

H18.3. IEPE conditioning modules that output monitor signals for a minimum of 36 channels total.

H18.4. Charge accelerometer conditioning for a minimum of 36 channels (support for IEPE sensors with same module is preferred).

H18.5. Strain gauge conditioning (1/4-, ½, Full Bridge configuration with shunt calibration capability) for a minimum of 15 channels. Must support other bridge sensors such as DC accelerometers and strain-based load cells.

H18.6. Voltage and IEPE modes selectable by channel H18.7. Transducer Electronic Data Sheet (TEDS) support, IEEE 1451.4 standard H18.8. Minimum of 108 channels of 24-bit ADC technology, with at least 130 dB spurious free dynamic range with alias free bandwidth to at least 25 kHz.

H18.9. Minimum of 104 channels of dual 24-bit ADC technology with 160 db spurious-free dynamic range with alias free bandwidth to at least 50 kHz.

H18.10. Minimum of 15 channels of dual 24-bit ADC technology with 160 db spurious-free dynamic range with alias free bandwidth to at least 100 kHz.

H18.11. Noise floor capabilities guaranteed at full scale input range of 10V of less than 500 nanoVoltsRMS/√Hz measured at 1000 Hz.

H18.12. Frequency Response no greater than +/-0.1db from high-pass filter cutoff to maximum of the available bandwidth range.

H18.13. Overload (including out of band overload) and open circuit indicator on front of hardware per channel H18.14. AC coupling with 3 dB down to at least 0.5 Hz H18.15. DC coupling

H19. Source Channels:

H19.1. Minimum of 4 channels with ability to have a source in every chassis.

H19.2. +/- 10 V output H19.3. BNC connector H19.4. Ramp start and stop time H19.5. Output waveforms: fixed or burst sine, swept sine, stepped sine, random, burst random, pseudo-random, periodic random, user defined waveform.

H19.6. Support output frequency range of 0 Hz to at least 50 KHz.

H19.7. Each chassis must have ability to contain two or more sources.

Software Requirements

The software shall meet the following requirements.

S1. Perpetual license with single year support included.

S2. Licensing shall support 3 simultaneous users: 2 for data acquisition and 1 for stand-alone post-processing, with no requirement, in any respect of software, for internet access or wireless operation.

S3. Shall support English and SI units.

S4. Test parameter and channel setup storage/export/import/reporting.

S5. System self-test including internal channel testing and report generation showing system and channel results and if passed or failed.

S6. Display module status for channels and inter-connection and system condition.

S7. Auto ranging for input channels.

S8. Free-run and triggered acquisition modes.

S9. Trigger level and pre-trigger setting for impact testing. Automatic determination of trigger parameters is desirable.

S10. Allow user rejection of individual data blocks during impact testing. Auto-detection of double hits and high or low amplitude hits desirable.

S11. Support set up and execution and data processing of an open-loop burst-random test with up to 4 shakers.

S12. Support set up and execution and data processing of an open-loop multi-phase stepped sine test with up to 4 shakers.

S13. Extensive display tools during and after measurement for immediate evaluation and comparison of data.

S14. Time data throughput to disk during data acquisition.

S15. Real-time view of channel status.

S16. Real-time view of user-selected measurement data plots.

S17. Data analysis software shall be able to read the acquired data from the acquisition software in its native format.

S18. Store input channel statistics per channel from data acquisition (i.e. # overloads/under-range, RMS, dynamic range, min/max per channel per average) S19. Ability to perform batch reporting into Microsoft Office products (pdf generation desired).

S20. Data output export to universal file format.

S21. Frequency Domain Processing:

S21.1. Windowing: Force-exponential, exponential uniform, Hanning, flattop S21.2. Ability to choose recorded data and sections of time histories for data analysis.

S21.3. Automated calculation and display of the following:

21.3.1. Spectra, FRF, coherence, auto-power, cross-power, octave bands functions.

21.3.2. RMS and peak amplitude scaled spectrums, power, power spectral density, and energy spectral density spectral processing options.

21.3.3. FRF’s calculated with H1/H2/Hv options

21.3.4. Multi and partial coherence, Principal (virtual) force spectrums for MIMO uncorrelated input evaluation, Cross-power, and Auto-power S22. Modal Analysis (Minimum of 1 license to meet the following):

S22.1. Test geometry creation and visualization with ability to define structure on a component basis S22.2. Data input from finite element model (modal parameters for comparison and Cross MAC/Ortho). Sources either universal file format or PATRAN/NASTRAN.

22.2.1. Read analytical derived mass matrix for calculation of Cross-Orthogonality

22.2.2. Import geometry and modes from an analytical model in universal file format

22.2.3. Comparison of test data with pretest analytical data (FRF’s, modal freqs., Cross MAC) S22.3. Source signal definition: fixed sine, multi-phase stepped sine, random, burst random, periodic random, user defined.

S22.4. Multi-input/multi-output capability and support for time data acquisition, impact testing (both roving and fixed reference), and integrated MIMO shaker control.

S22.5. Mode shape display and animation on geometry.

S22.6. Operational Deflection Shape and Time animation from acquired test data S22.7. Comprehensive view of acquired data to facilitate selection and de-selection in use for modal analysis S22.8. MIMO FRF analysis to determine frequency, damping, and modes shapes, modal scaling.

S22.9. At least one frequency and one time domain algorithm for modal extraction, with real-time feedback on quality of curve-fitting results.

S22.10. Calculation of mode indicator functions including complex and multivariate.

S22.11. Comparison of original and synthesized FRFs and model FRFs.

S22.12. Modal validation tools such as Modal Assurance Criterion (auto and cross MAC), modal phase co-linearity, and mean phase deviation.

S23. Post Processing S23.1. Time history processing:

23.1.1. Editing of groups of measurements including selection of portions of the time histories.

23.1.2. Support for following individual math functions on groups of measurements: offset, scale, addition, multiplication, raising to a power, high-,low, and band-pass filtering, decimation, statistics, auto-correlation.

23.1.3. Support for following multi-function math functions: addition, multiplication, power, cross-correlation.

23.1.4. Ability to run user-defined post-processing in a batch mode.

S23.2. Frequency Domain Processing:

23.2.1. Windowing: Force-exponential, exponential uniform, Hanning, flattop

23.2.2. Ability to choose recorded data and sections of time histories for data analysis.

23.2.3. Spectra, FRF, coherence, auto-power, cross-power, 1/n octave bands functions.

23.2.4. Spectrograms

23.2.5. RMS and peak amplitude scaled spectrum, power, power spectral density, and energy spectral density spectral processing options.

23.2.6. FRF’s calculated with H1/H2/Hv options

23.2.7. Multi and partial coherence, Principal (virtual) force spectrums for MIMO uncorrelated input evaluation, Cross-power, and Auto-power.

23.2.8. Support addition, multiplication of functions with each other.

23.2.9. Support complex math operations such as conjugate, scale by real or imaginary or magnitude.

23.2.10. Support for single function operations including integration, differentiation, raising to a power.

23.2.11. Ability to run user-defined post-processing in a batch mode.

Optional Capabilities

The following capabilities are desired for this system for future use. These upgrade capabilities of the proposed hardware/software system will be considered as advantageous:

U1. Vibration test acquisition and closed loop shaker control for random, sine sweep, and shock testing. Real-time closed loop vibration control capability must be acceptable for 32 channels – and a single source - with remaining channels executing simultaneous monitoring and acquisition. Metrics such as force level control and abort limit protections will be evaluated based on sine control, and random type environmental style testing.

U2. Modal test acquisition and closed loop shaker control capability including impact, multi-input/multi-output random, and stepped sine. Capabilities to provide force level control and abort limit protections shall be included. Modal data analysis software shall provide geometry import and creation, single-input/multi-output and multi-input/multi-output modal parameter estimation, operational modal analysis, and operational and deflection shape.

U3. Pricing for additional Single and Multi-year maintenance agreement options and hardware calibration services shall be provided and will be considered in total system life cycle costing.