PERFORM 3-D LASER SCAN OF HULL

WORK ITEM 1: Structural Analysis, 3D Laser Scan, Perform 1. SCOPE 1.1 Intent. This work item describes the requirements for the Contractor to perform 3D laser scan of the cutter's exterior hull shell, deck and dock floor locations/deformations and provide results in 3D CAD format. 1.2 Government-furnished property. None 2. REFERENCES COAST GUARD DRAWINGS Coast Guard Drawing 110 WPB 085-007, Rev D, Booklet of General Plans Coast Guard Drawing 110 WPB 085-002, Rev -, Docking Plan Coast Guard Drawing 110 WPB 111-001, Rev B, Shell Expansion COAST GUARD PUBLICATIONS Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2012, General Requirements OTHER REFERENCES None 3. REQUIREMENTS 3.1 General. The Contractor shall use the Coast Guard drawings listed in Section 2 (References) as reference to conduct the 3D laser scan of the vessel. 3.1.1 CIR. None. 3.1.2 Tech Rep. The Contractor shall provide the services of qualified personnel with the experience and knowledge to conduct a three-dimensional laser scan model identifying hull and deck deformations in 3D CAD format. 3.1.3 Protective measures - general. The Contractor shall furnish and install all protective coverings to seal off and protect all non-affected vessel's components, equipment, and spaces in the vicinity of the work area against contamination during the performance of work. Upon completion of work, the Contractor shall remove all installed protective measures, inspect for the presence of contamination, and return all contaminated equipment, components, and spaces to original condition of cleanliness. 3.1.4 Interferences. The Contractor shall handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences). None. NOTE The USCG conducts structural analysis efforts requiring accurate measurement of the hull shape including both global and local deformations. Measurements of hull global and local deformations are evaluated relative to the design hull lines is a key part of this hull strength analysis and implications on shafting alignment . 3.2 Three dimensional laser scan. The Contractor shall perform a 3D laser scan of the cutter's hull (sides, bottom and transom) deck, shaft struts (and shafting if in place) and the dock floor to obtain the 3D point cloud and provide a registered, reduced point cloud data set. 3.2.1 The 3D laser scan point cloud accuracy shall be within +/- 2 mm local scans and 5mm global scan alignment for the hull and deck surfaces. A point cloud reduction process shall be conducted to determine the shell plating deformations including an average of the deck nonskid covering to show the underlying plate deformations by averaging points over a 20mm grid on the hull. The point cloud of hull appendages shall be reduced over a 1mm grid. 3.2.1.1 The Contractor shall convert the 3D laser scan (3D Point cloud) to a point cloud format that can be used in Rhino 3D version 5.0. The Contractor shall digitally remove staging interferences located around the hull of the Cutter. 3.2.1.2 The Contractor shall compare the measured 3D point cloud and meshed surfaces to the hull lines based NURBS surface developed by US Coast Guard SFLC to determine dimensional deviations from the lines based NURBS surface. The dimensional deviations shall be rendered in the Rhino 3D in 1mm increments and colors to show the dimensional gradients. The Contractor shall position the hull relative to the 3D hull surface in coordination with the US Coast Guard. 3.3 The Contractor shall travel to a designated shipyard location to perform the 3D laser scan. The Contractor shall coordinate dates of performance with the US Coast Guard Inspector. 3.4 Report. The Contractor shall provide a neatly organized model using layers and color contour images of the surface comparisons. The Contractor shall provide the 3D point cloud in Rhino 3D 5.0 format files and deliver them in electronic format by ftp or mailed CDs to the COR within 2 weeks after conducting the 3D Laser Scan. 3.4.1 The report shall include all photographs, illustrations, charts, graphs, tables, calculations, text, analyses, algorithms, conclusions and recommendation deliverables developed as a part of this project. The Coast Guard will review the report, and may provide feedback or conduct discussions with the Contractor prior to acceptance. 3.4.2 The report shall be delivered to USCG with a document cover letter to the following address: USCG Surface Forces Logistics Center (Mail Stop 25) 2401 Hawkins Point Road Baltimore, MD 21226-5000 Attn: Mr. Karl Stambaugh 3.4.3 Data rights. All data regardless of form or medium shall be the sole property of the US Coast Guard and shall not be released without the written consent of the US Coast Guard. 4. NOTES This section is not applicable to this work item.