TESTING & RESEARCH

Thruster Dynamometer Test Stand
NAIAD thrusters are rigorously tested under full load on our unique Dynamometer Test Stand. Before delivery each thruster is cycled in continuously reversing rotation against a propeller shaft load to dynamically test the performance of the bearings, seals, and hydraulic motor in a full load controlled real world test. NAIAD Thruster output, performance and quality are proven before launch!

 
Integrated Hydraulic System Test Apparatus  
NAIAD Integrated Hydraulic Systems are custom-configured to exactly suit a vesselís unique array of hydraulically operated devices. Bringing a unique group of hydraulic consumers together can cause uninteded peculiarities. Thatís why NAIADís in-house full system test capability utilizing our unique 285 HP Variable Speed Hydraulic Load-Sensing Test Apparatus is so special. 

Introduced in 2001, the full system IHS Test Apparatus definitively ensures that the systemís original design engineers, under measurable factory test conditions, solve any undesirable hydraulic anomalies such as ďcross talkĒ among the various combinations of hydraulic consumers. This avoids wasteful post-installation troubleshooting by field service personnel operating under pressure and time constraints. The actual deliverable stabilizer, thruster, windlass, capstan, water pump, deck crane and all hydraulic consumers and components including main pumps contained in NAIAD IHS are tested together under real-world load conditions exactly as they will function in service. NAIADís system wide, Factory Acceptance Testing procedures raise the industry standard for proven and reliable IHS performance.

Stabilizer Roll Simulation Test Platforms
Every NAIAD stabilizer is factory tested as a full system on one of four Variable Frequency Roll Simulation Test Platforms. In addition to calibrating and optimizing controller settings to suit the vessel application, the entire system is hydraulically powered and fully operated. This pre-delivery functional test ensures absolute compatibility, harmonization and proven performance among all system components.
 

While time and labor intensive, our Factory Acceptance Testing ensures our customerís actual deliverable system has met or exceeded all specifications and our demanding quality standards. Customers are invited to attend the FAT of their system.

Research & Development
In addition to full-scale field tests, NAIAD thruster propellers, stabilizer fins, T-Foils and other control surfaces have been evaluated and optimized in a Hydrodynamic Research and Test Facility by professional hydrodynamists. Our cavitation tunnel testing, combined with our highly refined and adapted capability in Computational Fluid Dynamics, yields highly reliable data and ensures optimum underwater design configurations. 


Motion Simulation and Analysis
NAIAD can provide an analysis of a vessel's motion and assess the requirement for the stabilization of pitch, heave, roll, and yaw motions by means of trim tabs, interceptors, fins, T-foils, rudders or any similar control device. The programs predict the statistical properties of a vessel's motions with and without active ride control while the vessel is running at any heading relative to a unidirectional random seaway.

The NAIAD simulation program first models the bare hull and simulates the design's uncontrolled state. The predicted uncontrolled motions can be compared to model test results to validate the simulation program. At this time adjustments to the mathematical model are made, if necessary. Next, using the active roll, pitch and yaw control devices driven by a NAIAD controller, the motions are predicted for the same sea conditions.

A technical memorandum summarizing the results of the simulations and discussing any design recommendation for improving seakeeping or directional control problems is provided to the customer. The results can be presented in graphical presentation for the standard deviation of heave, pitch, roll, sway and yaw motions, as well as vertical and lateral accelerations at customer selected locations. The vertical and lateral acceleration results may be used to calculate the Motion Sickness Incidence (MSI) and Motion Induced Interruption (MII). In addition, Response Amplitude Operators (RAO) of the vessel motions can be presented.

More Details on Motion Simulation and Analysis

Estimations of the control surface resistance and power requirements are also available. If ride control is deemed necessary, a technical specification and quotation of the recommended system is provided.

NAIAD simulation programs have been validated against both model and full-scale test data both with and without active ride control for a variety of hull forms.