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Large Cavitation Channel (LCC) Data Acquisition Application

CASE STUDY: TCSOOS

Claude Sweeton

Sr. Sales Engineer

TEVET

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www.tevetllc.com

CUSTOMER:

SOW:

DoD US Navy NAVSEA NSWC Carderock

N00167-14-T-1300422029-01

The DoD US Navy NAVSEA NSWC Carderock has operated the William B Morgan Large Cavitation Channel (LCC) since 1991. The LCC is one of the world's largest and most technically advanced high speed, variable-pressure closed-loop water tunnel facilities. This facility is designed for a wide variety of hydrodynamic and hydro-acoustic tests. Its overall size and capabilities allow test model Reynolds numbers to approach, or even achieve, those of full-scale air or water-borne transportation systems.

Reynolds number (Re) - is a dimensionless quantity that is used in fluid mechanics

to help predict similar flow patterns in different fluid flow situations. The Reynolds

number is defined as the ratio of momentum forces to viscous forces and

consequently quantifies the relative importance of these two types of forces for

given flow conditions. Reynolds numbers are defined when performing scaling of

fluid dynamics problems and determine dynamic similitude between two different

cases of fluid flow - laminar and turbulent flow.

• Laminar flow occurs at low Reynolds numbers where viscous forces are

dominant and is characterized by smooth, constant fluid motion

• Turbulent flow occurs at high Reynolds numbers and is dominated by inertial

forces which tend to produce chaotic eddies, vortices, and other flow instabilities.

Re = Inertial Forces

Viscous Forces

The LCC is capable of testing all types of ship and submarine propellers and

propeller-hull interactions with model scales sufficiently large to match the largest towing and turning basins in the world. The tunnel test section has a cross-section

area of 100 square feet (10 feet by 10 feet) and can accept models up to 40 feet in

length. Its sophisticated design permits the U.S. Navy to measure submarine and

surface ship power, efficiency, and propeller noise by using models in a controlled but realistic environment.

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The LCC is a closed vertical plane recirculating 1.4 million gallons at variable-speed,

variable-pressure, and has a channel with lower-half submerged in 2.5 million

gallons water-filled trench. The LCC has numerous other acoustic treatment

features, a 6:1 contraction ratio, aeration/deaeration system, filter system (5-

micron), temperature control, stainless-steel shell, models mounted on large

removable test top, and low turbulence (0.1%). It also has high-speed capability

up to 50 feet per second and a large test chamber with 10-foot by 10-foot cross-

section and a 13.1 meter (43 foot) working length. Pressure in the LCC test

section ranges from less than atmospheric to four times atmospheric pressure, the

equivalent of water approximately 100 feet deep.

OPERATING SPECIFICATIONS

• Test section pressure: 3.5 to 414 kPa (0.03 to 4 atmospheres, 0.5 to 60 psi)• Test section velocity: 2.6 to 18 meters per second (5 to 35 knots, 8.5 to 59 feet

per second)

• Test section size: 3 meters by 3 meters (10 foot by 10 foot) in cross section and

13 meters (43 feet) in length• Air content: 10% to 100% saturation

As a model is held stationary, water flows at speeds up to 35 knots and combines

with variable pressure to allow simultaneous measurements of propeller cavitation

and acoustics from the models propulsion, hull, and appendages. This facility is

capable of performing tests involving cavitation, force measurement, flow

visualization, and noise on complete hull-appendage propulsor models, bodies of

revolution, surface ships, submarines, and torpedoes; open water propeller tests;

basic and applied research requiring low background noise levels, large Reynold's

numbers, variable pressure, and low turbulence levels.

MINIMUM REQUIREMENTS

The US Navy Solicitation went out "Small Business - Set-Aside". In addition, the

Small Business was required to be SAM registered.

NSWC Carderock required a Data Acquisition (DAQ) system to meet the

requirements of the Very Large Test Apparatus (VLTA) experiments and testing at the LCC for the Ohio Class (SSBNs) Replacement Program (ORP).

The US Navy identified National Instruments (NI) CompactDAQ hardware and

software for use in this requirement because they were already familiar with their

instruments. This familiarity with Ni's products reduced setup and implementation

time, thus reducing cost associated with time and labor. The particular NI DAQ hardware selected met the stringent physical design constraints, necessary signal

conditioning requirements, and the compatibility with existing NI hardware. The US

Navy also conducted testing and evaluation on a subset of Ni's hardware they

already owned to verify operation within the required test environment and

conditions.

• Backwards Compatibility - with existing NI hardware and software at NSWCCarderock



NSWC Carderock, Large Cavitation Channel (LCC}

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• Lateral Hardware/Software Compatibility - with existing DAQ systems at

NSWC Carderock streamlining knowledge and resource sharing

• Hardware Performance Requirements - meet the physical characteristic, data processing speed, and data acquisition rates necessary to perform experiments, testing, and deliver data to support customer deliverables of agreed fidelity

MINIMUM TECHNICAL REQUIREMENTS

• Condition - New (no 2nd hand instruments)

• Data Acquisition (DAQ) system - Chassis

o Shall provide the ability to meet Backwards Compatibility, Lateral Hardware/Software Compatibility, and Hardware Performance Requirements

o Operating Temperature: -20° to 55° Celsius (IEC-60068-2-1 and

IEC-60068-2-2)

o Ingress Protection: IP 30

o Operating Humidity: 10 to 90% RH (IEC-60068-2-56)

o Measure up to 256 Channels of acoustic signals

o Support hot-swappable 1/0 Modules with integrated signal conditioning

o Simplify setup with zero configuration networking and a built-inweb-based configuration utility

• NI Developer Suite (779601-35) - English, include LabVIEW PDS,

LabWindows/CVI, Measurement Studio, Signal Express, and LabVIEW and

LabWindows/CVI add-on tools. Single License Seat. 3yrs Developer Suite

Standard Service Program.

• Chassis Synchronization Module

o Cabled timing and synchronization C-Series Module used to route clocks and triggers between multiple chassis.

o Synchronize all system module types across multiple CompactDAQ chassis, including analog input (Al) tasks with any Al module type, analog output(AO) tasks, and digital 1/0 and counter tasks.

• 4-Channel, 16-Bit, ±10V, 100kS/s per Channel, C-Series AO Moduleo 250 Vrms, CAT II isolation

o -40 °C to 70 °C operating range, 5 g Vibration, 50 g Shocko Module to include a channel-to-earth ground double isolation barrier for

safety and noise immunity

• 4-Channel (Differential), 24-Bit, ±10V, 50kS/s per Channel, C-Series Al Module

o 250 Vrms ch-ch, CAT II (screw terminal), or 60 VDC ch-ch, CAT I (BNC) isolation

o Anti-alias Filter

o -40 °C to 70 °C operating range, 5 g Vibration, 50 g Shock

o Channel-to-Channel Isolation

• 4-Channel, 24-Bit, ±5V, 51.2kS/s per Channel, 102dB Dynamic Range,C-Series Signal Acquisition Module

o Software-selectable IEPE signal conditioning (O or 2 mA)

o Software-selectable AC/DC coupling; AC-coupled (0.5 Hz)

o Anti-alias Filter

o -40 °C to 70 °C operating range, 5 g Vibration, 50 g Shock



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T 20m

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William B. Morgan Large Cavitation Channel

TEVET RESOLUTION

TEVET engaged directly with the engineering team at NSWC Carderock to gain a

full understanding of the application and the test challenges they were faced with.

TEVET conducted a full gap analysis to gain further insight to what was required for

not only today's need but also future capabilities the customer may have.

Determining factors of the gap analysis for identifying the best COTS solution

included selecting a DAQ system that had not only the current requirements, but

had the capability to easily expand to address future DAQ requirements. After

evaluating several technologies from different instrumentation providers, TEVET

concurred that Ni's hardware and software was best suited.

NI cDAQ-9188 (CompactDAQ 8-Slot Chassis) - with

NI 9469 (Synch Module for Delta-Sigma Al)

(Qty 3) NI 9234 (4 BNC Input, 24-Bit. 51.2kS/s, SW Selectable IEPE & AC/DC Modules)

(Qty 2) NI 9239 (4-Ch ±10 V, 50kS/s/Ch, 24-Bit, Ch-Ch Isolated Al Modules)+ NI 9971

(Backshell for 2-position connector blocks)

(Qty 1) NI 9263 (Screw Term, ±10 V, 16-Bit, 100kS/s/ch, 4-Ch AO Module)

The NI cDAQ-9188 is an 8-slot Ethernet chassis designed for

remote or distributed sensor and electrical measurements. A

single cDAQ-9188 chassis can measure up to 256 channels

of electrical, physical, mechanical, or acoustic signals. By

combining more than 50 sensor-specific NI C Series 1/0

modules with patented NI Signal Streaming technology, the

cDAQ-9188 platform delivers high-speed data and ease of

use in a flexible, mixed-measurement system.



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• The above NI Hardware was configured with NI Developer Suite (779601-35) – include LabVIEW PDS, LabWindows/CVI, Measurement Studio, Signal Express, and LabVIEW and LabWindows/CVI add on tools. Single License Seat. 3 yrs Developer Suite Standard Service Program. ENGLISH

• NI soluon comes with 1-year standard warranty

The NI 9234 is a 4-channel C-Series dynamic signal acquision module for making high-accuracy audio-frequency measurements from integrated electronic piezoelectric (IEPE) and non-IEPE sensors with NI CompactDAQ or CompactRIO systems. The NI 9234 delivers 102 dB of dynamic range and incorporates soware-selectable AC/DC coupling and IEPE signal condioning for accelerometers and microphones. The four input channels simultaneously digize signals at rarates up to 51.2 kHz per channel with built-in an-aliasing filters that automacally adjust to your sampling rate.

The NI 9239 is a 4-channel, 24-bit C Series analog input (AI) module for use in any NI CompactDAQ or CompactRIO chassis. With channel-to-channel isolaon, your enre system, including the device under test, is protected from harmful voltage spikes up to the isolaon rang. In addion to safety, isolaon eliminates measurement errors caused by ground loops because the front end of the module is floang. The NI 9239 uses a combinaon of analog and digital filtering to pto provide an accurate representaon of in-band signals while rejecng out-of-band signals. The filters discriminate between signals based on the frequency range, or bandwidth, of the signal.

The NI 9263 is a 4-channel, 100 kS/s simultaneously updang analog output (AO) module for any NI CompactDAQ or CompactRIO chassis. It also features ±30 V overvoltage protecon, short-circuit protecon, low crosstalk, fast slew rate, high relave accuracy, and NIST-traceable calibraon. The NI 9263 module includes a channel-to-earth ground double isolaon barrier for safety and noise immunity.

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