Services - HANN-OCEAN

SERVICES

Engineering Design

Computer Simulation

Site Survey and Data Collection

Ocean Energy Resource Assessment

Model Making and Tank Testing

Prototype Building and Performance Testing

Facilities

Engineering Design

Design of Marine Vessels, Floating Platforms, Pontoons, Fastening Systems and Connectors, Station Keeping and Mooring Systems

The team comprises naval architects, structural engineers and mechanical engineers with over 20 years of experience in naval architecture and ocean engineering. We are capable of designing conventional and unconventional marine vessels and floating platforms based on ship class rules or from first principles. Using our proprietary securing system – Rigid Pontoon Connector, our engineers excel at designing floating platforms which are linked to modular pontoons. The entire floating system can also be moored using a unique station keeping system devised by the company.

Hann-Ocean offers a full spectrum of design services – from feasibility studies through basic design to detailed technical design.

Research & Development: Products, Systems, Structures and Mechanisms

Hann-Ocean is a technology developer as well as a product designer. Our engineers not only develop our patented technology and relevant commercial products but also provide design solutions for mechatronic systems, mechanical devices, structures and rapid prototyping services to clients.

Measure, Evaluate and Resolve Impact of Noise, Vibration and Underwater Shock

With 11 years of experience in defence engineering, our team is capable of resolving noise and vibration problems in steel structures and marine vessels. We are also equipped to conduct a shock hardening program to assess and improve survivability of marine vessels, structures and critical onboard equipment against underwater explosions.

Computer Simulation

Hann-Ocean is in possession of high-performance workstations for performing computational fluid dynamics simulations and structural analyses. Our workstations are capable of running OpenFoam for wave simulations, SolidWorks Flow for turbine analyses and SolidWorks Finite Element Analyses of structures.

We have considerable expertise in steady state flow (turbines) and two-phase VOF wave simulations, accrued over several years of application. For instance, the company’s two wave flumes – ‘Hann-Ocean 01’ and ‘Hann-Ocean 02’ were designed and validated using wave simulations performed by our engineers. We have also leveraged our simulation expertise into validating Drakoo’s performance, which will be endorsed by DNV GL.

The team has extensive experience in performing finite element analysis using SolidWorks for the company’s products such as floating platforms, connectors, mooring systems, wave makers/converters and tidal devices.

Hann-Ocean is capable of translating this experience into meaningful, bespoke solutions to meet our clients’ design needs.

Site Survey and Data Collection

Site survey and data collection are important procedures for customizing Drakoo WEC systems and RigiFloat platforms to ensure optimal return on investment for the client. We have advanced instruments to measure water depth, current speed, tidal changes, wave height, time period and temperature. We also employ data loggers to collect environmental statistics 24/7, which can be transmitted to FTP servers located in our office via 3G/4G mobile broadband for monitoring and analysis purposes.

Our experience and instruments for survey and data collection can be used in several areas of offshore engineering for clients seeking expertise in these fields.

Ocean Energy Resource Assessment

In order to shorten the rate of return for any project and to forecast annual power production, we carefully analyse wave statistics such as wave height, period, probability of occurrence, directional distribution and seasonal effects. Drakoo WEC’s verified performance spectrum is projected onto the data at hand and software developed in-house processes the information to produce annual energy output and cost of electricity for the client.

Model Making and Tank Testing

Our engineers have extensive experience in building and performing wave tank tests for prototypes and scaled models. Drakoo WEC, which has seen 10 years of development, is now a robust and highly efficient device because of the considerable number of tests it has undergone. Several iterations of prototype tests, scaled and full model tests, numerical models and simulations have accompanied Drakoo’s growth at every stage of its development. As a direct consequence of the time spent testing, its performance has been verified both internally and externally by independent bodies such as NAREC, UK.

Hann-Ocean seeks to leverage this experience and the infrastructure that it owns (more under ‘Facilities’) into wave tank testing services for its clients.

Prototype Building and Performance Testing

It is essential to evaluate the true potential of any wave energy converter technology including Drakoo through building and testing of real/full scale prototypes. Facing the complexity of full scale and full system prototypes, as well as the challenge of random occurrence of ocean waves, Hann-Ocean has designed, invested and built a true scale ocean wave flume that can generate regular waves of between 2 to 8 sec period and up to 1.4m in wave height at a water depth of up to 5m. It can also generate random waves.

We have also designed and built 1kWp, 4kWp and 10kWp full scale prototypes of Drakoo and tested in the sea of Singapore and our Wave flume "Hann-Ocean 01". Building of the full-scale turbines and using commercial grade MPPT controllers, inverters and other components have enabled us to obtain experience and gain high efficiency of final products. Many lessons learnt from the sea trials of the Drakoo has provided us effective solutions to handle sea loads and anti-fouling issues in the most challenging tropical sea environment like Singapore. We are committed to deliver cost-effective and reliable wave energy converters to the end users. We can also help other wave energy device developers to evaluate their technologies in the most efficient way.

Facilities

Hann-Ocean has its own R&D facilities established with the primary goal of developing Drakoo wave technology. All infrastructure owned by the company can be customized to suit other functions, in addition to being available for lease.

Hann-Ocean 01 Twin Wave Flume at HOENT

Hann-Ocean Energy, Nantong (HOENT) owns the large-scale, deep-water wave flume, ‘Hann-Ocean 01’ at its factory in Su-Tong Science and Technology Park, Nantong, China. Designed and constructed by the company with the aim of testing Drakoo WEC systems prior to deployment, it can also be used for testing other WECs, fixed and floating anchored marine structures.

The wave flume structure is 45 meters long and 10 meters wide, with a built-up height above the ground restricted at 4 meters so as to accommodate a 5 ton over head crane installed at the site. A unique U-bend design allows for longer wave propagation by splitting the structure into a twin flume consisting of: (a) a primary flume, 3 meters wide, 5 meters deep and 42 meters long and (b) a secondary flume which is 5.5 meters wide, 3.5 meters deep and 42 meters long. Thus, a WEC deployed in the primary flume would have a longer hind flume and experience considerably less secondary reflective wave action. This unique U-bend, twin flume design can accommodate a large-scale fixed WEC array in the primary flume as well as a model-scale floating anchored WEC within the wider, secondary flume.

Hann-Ocean 02 Wave Flume

Hann-Ocean is also in possession of a 5.6 meter modular wave flume made of acrylic panels, named ‘Hann-Ocean 02.’ It was used extensively in the early stages to test two types of model-scale Drakoo WECs. Additionally, the flume is also used by the company to do small-scale wave tests on floating and fixed models. Installed on one end of the flume is an automatic wave maker which is actuated by a stepper motor. The latter is controlled using a program in C# language to generate waves over a wide range of wave heights and periods. When performing tests, a Drakoo-B WEC model is placed downstream of the flume to process the incoming waves.

Hann-Ocean 01 can be leased to other parties who may be interested in performing small-scale tests for their own devices . We also offer consultation services to design and fabricate customized, small-scale wave flumes.

Wave Maker

The Hann-Ocean 01 wave flume facility at Hann-Ocean Energy, Nantong (HOENT) is equipped with a custom made flap-type wave maker at the front-end of the primary flume. The design process of this wave maker involved detailed wave-hydraulic analyses and structural finite element analysis to verify its performance and durability.

With a nominal input power rating of 120kW, the wave maker is capable of generating waves up to 1 meter high with a time period range of 2 to 8 seconds. It has a total flap width of 3 meters with four independently controlled paddles. Other components include pistons, actuators, servo motors, control cabinets, support structures and one water level sensor positioned 5 meters ahead of the paddles.

For any given wave height-time period combination at the desired surface elevation, paddle position and motor rotation time series are derived in a controller and forwarded to the motors. Several parameters in the controller program are manually adjustable, such as compensation factors to account for differences between desired waves and actual waves. Furthermore, the wave maker is calibrated for active absorption – it uses feedback from elevation measurements to correct the motor’s operation.

Mechanical and Electrical Workshops at HOENT

Hann-Ocean Energy, Nantong (HOENT) currently has the capacity to assemble and store all its equipment, products and other experimental resources. It can easily accommodate the installation of a mass production line for large-scale Drakoo projects. The site also functions as a workshop for testing complete Drakoo systems and other mechanical/electrical equipment. Furthermore, HOENT is equipped with the Hann-Ocean 01 wave flume to conduct full-scale performance tests of Drakoo WEC as well as to perform more specialized tasks, including steady state hydrodynamic tests of Drakoo elements such as the custom made Kaplan turbine.

High Performance Computers

Hann-Ocean has large computing resources at the Singapore headquarters as well as in the R&D centre and factory located in Nantong, China. These can be used for Computer Aided Design, Finite Element Analysis and Computational Fluid Dynamics (Solidworks and OpenFoam are used by the company for the latter purposes).