Propulsion Software May Allow Ferry to Begin Service

Tuesday, August 17, 2010

Officials with the Washington State Department of Transportation Ferries Division said that changes to software controlling the propeller system on the new Chetzemoka ferry may provide a temporary solution to vibration issues first discovered last month.

Additional sea trials are scheduled for the middle of next week after representatives of the propulsion-control company write software exerting greater control over the engine “ramping,” which allows the bow propeller to slow the ship as it approaches the dock. The goal is to ramp up the propeller speed over a period of a few seconds longer, as opposed to a more sudden and quick thrust of power.

“The good news is that we have identified software changes that may prevent the engine from overpowering the propeller used to stop the vessel,” said David Moseley, assistant secretary of the Washington State Ferries. “These new operating guidelines could allow us to operate the Chetzemoka safely and reliably while we continue working to permanently resolve the vibrations.”

If the sea trials show that the propulsion-system changes eliminate the vibrations and also meet the required standards for stopping distances, Moseley said decisions will be made on when to schedule the inaugural launch of the 64-vehicle ferry between Port Townsend and Coupeville. The planned first sailing on Aug. 29 was postponed when excessive vibrations were discovered.

“The whole purpose of sea trials, which we began in late July, is to test every system on a new boat to ensure that it can operate safely and reliably,” Moseley said, noting that sea trials and extensive analysis over the past week have helped eliminate internal components of the drive train, such as engine mounts and couplings and the gearbox, as causes of the vibration.

The state continues to work with Todd Pacific Shipyards, builder of the vessel, as well as the vessel design firm and other marine experts to resolve the vibration issues before formally accepting delivery of the Chetzemoka.
 

Maritime Reporter January 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Passenger Vessels

GE Powers Diadema Cruise Ship

Fincantieri shipyard to equip in-board propulsion for Carnival and Costa vessels, GE’s Power Conversion business has helped the shipyard successfully deliver the

Carnival, China Merchants Sign MOU

MOU will explore both Port & Destination Development and Ship-Owning joint ventures with the goal of potentially launching China’s first world-class domestic cruise brand.

ms Veendam Rescues Pilot Off Maui Coast, Hawaii

On Sunday, Jan. 25, 2015, at 5:21 p.m. local time while en route to Lahaina, Hawaii, Holland America Line’s ms Veendam answered a request for assistance from

 
 
Maritime Careers / Shipboard Positions Maritime Standards Navigation Offshore Oil Pipelines Pod Propulsion Port Authority Salvage Ship Simulators Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1658 sec (6 req/sec)