Author: pa

SVA Thruster Dynamometer

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LDA-System

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3D-PIV-System

3D_PIV_Konfigs3D_PIV_TurmCAD_PIV_Turm_forPrint3D_PIV_Rollanlage

With the 3D PIV system (TSI brand) the velocity fields in water can be measured. The possible field of view measures up to 800×1000 mm2 with a frequency of up to 14.5 Hz. At this maximum frequency up to 1200 frames can be recorded in one run. Beside the classical wake field data of velocity components along certain radii even the vorticity and turbulence intensity can be retrieved directly from the PIV results. Please refer to the table for more technical details. Read more about our 3D PIV system and its versatile applicability here.

Technical Specifications
Nd:YAG double pulse laser 190 mJ, max. Frequency 15 Hz
Resolution CCD cameras 2 Megapixel (1600×1200)
Colour depth/grey levels 12 bit
Max. recording frequency 14.5 Hz
Field of view 100×100 up to 800×1000 mm
Number of stereoskopic recordings per measurement run at 14.5 Hz 1200
Max. submersion depth of PIV probe 0.7 m
Max. submersion depth of single system components 4.5 m

Wave Generator

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Curabitur eu massa vitae turpis laoreet molestie in eu velit. Nunc in condimentum nisl. Suspendisse potenti. Nullam ante ex, varius nec dignissim faucibus, suscipit vel eros. Aliquam condimentum nisi sit amet est vestibulum tincidunt. Quisque nisl enim, tempor in porttitor sed, ornare ac massa. Mauris sed convallis nisl. Aenean volutpat finibus turpis. Ut porta sagittis ligula congue vestibulum.

Towing Tank

Rinne_CAD_small

SR_Schlepprinne_Zeichnung

SR_Lotsenboot

SR_SUBPMM_Traeger

The SVA Potsdam operates a towing tank which is 280 m long and has a rectangular cross-section of 9 m width and 4.5 m depth. The maximum towing speed is 7.5 m/s with an accuracy of 0.6 mm/s. The towing carriage is driven via two double stator linear motors.

At the front of the tank there is a wave generator which can produce regular and irregular waves and also wave packets up to a wave height of 0.30 m. At the back, the towing tank ends in a beach as a wave absorber.

In the towing tank, free running tests are carried out with propellers and propulsion systems as well as resistance and propulsion tests, wake field measurements and paint flow tests. Additional elements of the testing spectrum include maneuvering, seakeeping tests and experiments with submersibles.

The towing carriage is provided with a flexible carrier system that can accommodate all equipment and experiments. The support at the rear of the towing vehicle is hydraulically adjustable in height. For example, the open water dynamometer and the submarine planar motion system (SUBPMM) or the PIV system can be installed there.

The equipment of the towing carriage is completed with cameras for the QualiSys optical tracking system and video cameras as well as cameras for recording experiments and images of wave systems.

Technical Specifications
Towing Tank
Length [m] 280
Width [m] 9
Depth [m] 4.5
Towing Carriage
Max. Towing Velocity [m/s] 7.5
Precision Carriage Velocity [mm/s] 0.6
Wave Generator
Max. Wave Height [m] 0.3
Types of Waves regular, irregular, wave trains  

Sea Trial Evaluation

Prior to delivery and acceptance of new ships, the achievable speed for a given power and the power consumption for a given speed is determined in a trial (measured mile) with the full-scale version. Primarily, it is checked as to whether the contractual parameters have been achieved and, secondarily, whether the required EEDI is fulfilled.

To determine the delivered power, the torque and rotational velocity of the propeller for a given speed can be measured. This measurement can be carried out by the SVA onboard the ship with own measurement equipment.

Unlike model tests, the conditions in a measured mile are only in the rarest cases ideal. It can hardly be avoided that measured miles must be carried out in wind and waves, with shallow water effects, in areas of current, etc. To convert the environmental influences on the contract or experimental conditions, the measured mile results must be evaluated. The SVA Potsdam offers such calculations which are performed in accordance to the current standards of IMO and ITTC.