Auxiliary Turbine Generator Set Isolation System Design for US Naval Vessel

2012 ◽  
Author(s):  
Paul G. Jones ◽  
Steven L. Carmichael
Keyword(s):  
Finite Element Models ◽  
Component Level ◽  
Sea State ◽  
Turbine Generator ◽  
Full System ◽  
Naval Vessel ◽  
Isolation System ◽  
Actual Performance ◽  
Detail Design ◽  
Machinery Space

The RR4500 Auxiliary Turbine Generator (ATG) incorporates an isolation system addressing four main design requirement environments. These environments include high-impact shock, structureborne vibration, sea state motion, and installation/integration into the machinery space. Multiple design iterations were performed, beginning with a simplified system representation and expanding to full system finite element models. Specific resilient isolation mounts were selected to satisfy the competing criteria from the different requirement sets. Design resolutions passed specific requirements down to the component level and were addressed during detail design. Structures, system components, and flexible ship connections were adapted to meet the requirements needed by the isolation system. Testing of the system indicates good correlation between system predictions and actual performance.

A Practical Example of Simulation Assisted Engineering and System Integrated Test for ABWR RIP-MFG System

2009 ◽  
Author(s):  
Hitoshi Ochi ◽  
Atsutoshi Mizuide
Keyword(s):  
Power Supply ◽  
Rotational Inertia ◽  
Design Phase ◽  
Component Level ◽  
Simulation Code ◽  
Generator System ◽  
Recirculation Flow ◽  
Detail Design ◽  
First Case ◽  
Start Up

In Advanced Boiling Water Reactor (ABWR) the recirculation flow is controlled by Reactor Internal Pumps (RIP). For the new construction ABWR plant, Hitachi-GE applied a Motor Fluid coupling Generator system as a power supply of RIPs (RIP-MFG system). In RIP-MFG system, one MFG supplies electric power to five RIPs and controls the speed of RIPs simultaneously. MFG is the highly reliable power supply system and can sustain power supply to RIPs against grid perturbation due to its large rotational inertia [1]. Application for RIP-MFG system to ABWR is world’s first case although both MFG in BWR and RIP in ABWR are proven technologies. Since the recirculation flow system is the key system determining plant operational performance, Hitachi-GE applied Simulation Assisted Engineering (SAE) for RIP-MFG system to get higher reliability for designing RIP-MFG system and keep a plant constructional schedule due to avoid “trial and error” in the start-up test. The design process was broken down into 3 design phases and 7 design steps as follows. Basic design phase consists of step 1 through step 3. Step 1, a simulation code (RIP-MFG code) which contains electronic and hydraulics models for RIP and MFG was developed. Step 2, basic simulation was performed with RIP-MFG code and general inputs. It was concluded that RIP-MFG system would be basically applicable to ABWR recirculation flow control. Step 3, the System Requirements Specification for RIP-MFG system and the component design specifications were documented based upon the simulation. Detail design phase consists of step 4 through step 6. Step 4, The RIP-MFG components were produced and the component level tests were performed. Step 5, RIP-MFG system integrated tests were performed. The objective of the integrated tests was to verify the system design and the RIP-MFG code. The RIP-MFG code outputs have good agreement with both steady state and transient test data. It has concluded that RIP-MFG code is verified. Step6, the RIP-MFG controller parameters are now being evaluated with the verified code. Final test phase consists of step 7. Step 7, the performances of ABWR with RIP-MFG system will be evaluated finally in the plant start-up test.

scholarly journals Design and Realization of a Hybrid Excited Flux Switching Vernier Machine for Renewable Energy Conversion

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6060
Author(s):  
Haidar Diab ◽  
Yacine Amara ◽  
Sami Hlioui ◽  
Johannes J. H. Paulides
Keyword(s):  
Experimental Study ◽  
Renewable Energy ◽  
Energy Conversion ◽  
Original Structure ◽  
Finite Element Models ◽  
Direct Drive ◽  
Turbine Generator ◽  
Electromagnetic Design ◽  
Wind Turbine Generator ◽  
Tidal Turbine

This paper presents the design of a hybrid excited flux switching Vernier machine. This machine is designed to serve in renewable energy conversion applications, such as a wind turbine generator, or tidal turbine generator. After introducing this original structure, a design based on finite element models is conducted. The specifications correspond to relatively low power direct drive wind or tidal turbine applications. The rated power is set to 10 kW, with a rated speed of 300 rpm. Mainly the electromagnetic design is presented. Aspects related to the realization of a prototype are also presented, and an experimental study is included.

Global Strength Assessment for Semi-Submersible Column After Supply Vessel Collision Accident

2009 ◽  
Author(s):  
Zhiqiang Hu ◽  
Jianmin Yang ◽  
Longfei Xiao ◽  
Xiaomei Yan
Keyword(s):  
Direct Calculation ◽  
Finite Element Models ◽  
Sea State ◽  
Distinctive Character ◽  
Strength Assessment ◽  
Structure Damage ◽  
Collision Zone ◽  
Global Strength ◽  
Collision Force ◽  
Numerical Simulation Technique

The researches of the anti-collision characters of a semi-submersible column and its capability of surviving in severe sea state after collision accident are completed in the paper. Three collision cases are designed. A 5000 ton vessel hits the semi-submersible column in transversal, longitudinal and oblique direction. Numerical simulation technique is used to do the analysis, and anti-collision characters of the semi-submersible column are summarized by the curves of collision force vs. penetration, the energy absorption proportion and structural damages. It can be pointed out that the column show a distinctive character when the contact surface is large at the beginning of the collision. There is no rupture of outer shell, which means the column can sustain such kind of collision. Taking advantage of the direct calculation method with finite element models, the global strength of the semi-submersible is verified to assess the influence of structure damage by the collision on the semi’s survival capability in severe sea state. The structure damage caused by the collision is taken into consideration in the FE models. The code SESAM is used to do the calculation through the design wave method. Several assumptions are made to realize the comparison between collision cases. It is found that the collision influence is restricted within the scope of structural components around the collision zone. The collision damage caused by the hitting of 5000 ton vessel will not bring a serious threat to the global strength capability of the semi-submersible.

scholarly journals Detection of Isolated Vibration Spectrum Patterns Generated in Hull and Shafting Lines which Result Shipboard Faults

2018 ◽  
Vol 6 (2) ◽  
pp. 247-255
Author(s):  
Prasad Milinda Dasanayaka ◽  
Ranjan Perera
Keyword(s):  
Vibration Spectrum ◽  
Wind Condition ◽  
Channel Measurements ◽  
Sea State ◽  
Naval Vessel ◽  
Multiple Characteristics ◽  
Vibration Signature ◽  
Vibration Signatures ◽  
The Waves

The origin of shipboard hull vibrations is dominantly determined by vessels propulsion system, main machinery, auxiliary systems, pumps, breaking of the waves at the ship hull, etc. When the ships are classified on various sizes and limitations, they demonstrate multiple characteristics of vibration signatures mainly based on the functionality of main machinery and ships’ hull. The vibration signatures generated from hull is a clear representation of the ships health and crew habitability.  The paper is focused on to a case study that the hull of a naval vessel which had undergone a major repair was inspected for suitability for further use in terms of vibration and habitability. The transferred vibration signature of the vessel was analyzed using vibration spectra in machinery and hull aspects. The measuring was done simultaneously with multi-channel measurements of the vessels vibrations at few characteristic positions.  Sea trials at following variable conditions had been carried out onboard the selected vessel. Sea State : 2-3; Loading Condition : Half Load; Wind Condition : Moderate< 15 knots; Sea Direction : Ahead, Astern

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