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Structural Monitoring Offshore
airwerk GmbH · Südstr. 426897 Esterwegen · Germany
airwerk GmbH · Südstr. 426897 Esterwegen · Germany
Phone +49 (0)201. 125 169-10 Fax +49 (0)201. 125 169-29
Phone +49 (0)201. 125 169-10 Fax +49 (0)201. 125 169-29
Technical Solutionsby airwerk
Technical Solutionsby airwerk
Cost benefits from lower risk. About us
airwerk consists of a team of highly qualified, experienced engineers and technicians to assist you in all phases of your structural monitoring projects – from the planning stage to implementation and commis-sioning. Our comprehensive concepts, proven sensors and reliable, efficient data acquisition and transfer systems are the key to ensuring you get the structural information you need, when you need it. Interested in our innovative engineering services? Give us a call!
± Measurement campaign for the test of a new instal-lation procedure for OWEC rotor blades
± Specification & delivery of underwater acceleration measurement devices for a German offshore wind farm
± Application of strain gauge measurement for a OWEC prototype
± Concept for the implementation of a measurement campaign based on the observation method (DIN 1054) for 2 OWEC of a German offshore wind farm
± Pre-engineering of the structural monitoring system for 6 OWECs in a German offshore wind farm
± Measurement concept for structural monitoring for a German offshore wind farm consisting of
80 OWECs
± Engineering and implementation of measurement technology for the structural monitoring of 80 OWECs for a German offshore wind farm
± Engineering and implementation of measurement technology for the structural monitoring of 8 OWECs and an OSS in a German offshore wind farm
± Concept, engineering and implementation of meas-urement technology for indirect joint measurement on an OSS in a German offshore wind farm
Offshore ReferencesSample clients and projects
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Common sensors for Structural Monitoring
Dynamic Structural Behavior
Structural Loads and Material Stress
Grout Performance
MetOcean Data
Structural Inclination
Gas Composition
Corrosion Level
Scour Depth
Structure condition index for decision-making
Risk and asset management tool
Life cycle analysis
Fulfills legal requirements
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Engineers have been successfully designing robust structures for centuries. Given the fact that the first offshore wind farm was installed in Denmark in 1991, it is safe to say that we are still in the early stages of the learning curve regarding the industrialization of offshore wind energy.
Both the design environment and the extreme dimen-sions of offshore structures continue to challenge the industry. Engineers are striving to learn more about the load-bearing characteristics of offshore struc-tures, particularly in regard to cyclic loads. That’s why structural monitoring has become crucial not only for engineers but also for wind farm operators who need real-time information about the status of their offshore structures.
In addition, regulatory agencies also request verifica-tion of structural stability. In Germany, for example, the Federal Maritime and Hydrographic Agency (BSH) requires condition monitoring systems for 10% of all wind turbine supporting structures installed. If the offshore foundation structures cannot be sufficient-ly verified through conventional structural analysis, a wind farm operator may be required to apply the observation method according to DIN 1054/EC7. Furthermore, supplementary measurement devices
Lean offshore structures through monitoring
are required as part of a “case-specific approval” if the single members, joints or products making up the structure are not listed in the regulated construction products list.
Structural monitoring systems are the key to providing this information for a number of different stakehold-ers in the industry. An effective structural monitoring system provides online information about the integrity of the structure as well as information on the residual lifetime. It combines global structure characteristics with variations of local member parameters while taking into consideration the individual park character-istics and the operator’s information requirements.
With passion and dedication airwerk provides services to meet these challenges:
± Consulting
± Certifiable concepts
± Implementation planning
± Installation and maintenance
± Data evaluation and reporting
DAU
HDD Storage
Transition level
Top level
Sensors
OWEC
Model UpdatingSystem IdentificationSensitivity AnalysisRegular Reporting
OSS
Structural Monitoring System Services
WorldWideWeb
Operational Monitoring CenterOperational ManagementRisk IndexCondition IndexDecision support
System Maintenance Hardware DiagnosisData Availability
Mud line Raid Storage
SQL Database
Operator User groupWeb Server
Data Server
TCP/IP
SCADA Protocol
Optional: TCP/IP
Secure remote access
Optional
Optional: UMTS, VPN, DynDNS
hEmail ServiceStatus NotificationDataAlarms
Architecture & interfaces of a monitoring system
± Online and real-time information on the actual structural condition± Condition index suitable for decision-making± O&M risk-based asset management
Monitoring for Management Decisions
All airwerk structural monitoring concepts follow the principals, concepts and terminology related to risk and asset management as defined in ISO 55000 and ISO 31000. As a result, the Key Performance Indica-tors (KPIs) defined in our concepts can be seamlessly integrated into your risk and asset management decision-making.
Focus on the Essentials
With the multitude of sensors currently available on the market today it is possible to measure nearly every aspect of the structure‘s behavior individually. However, many sensors must be installed at difficult to access positions resulting in an increase in imple-mentation and maintenance costs. To keep the project budget under control it is crucial to follow a measure-ment strategy with clearly defined goals.
That’s why we recommend focusing on the essentials:
± Ultimate loads and fatigue± Few sensors at accessible locations± High reliability of equipment
Our focus on ultimate loads using just a few reliable sensors enables us to provide information on signifi-cant structural parameters, such as:
± Fatigue life± Crack detection± Performance of grouted and welded joints± Scour detection± Corrosion level
The key is ambient vibration monitoring. This moni-toring method has been used for decades in the struc -tural monitoring of robust structures. This method
is based on the fact that that every structure has an identifiable, unique vibration signature. Once this signature is known, statistical methods are applied to analyze the key performance indicators for an early indication of potential problems in the structure. This is a global approach, focusing on the behavior of the entire structure instead of on local “hot spots” alone.
Real-time condition index
Important structural parameters can be monitored online and in real-time in a condition index depicting a simple action scheme as a decision-making tool.
Getting to know your structure
Monitoring & asset management
ISO 31000Establishing the Context Frequency
Analysis
Mode Shapes
Vibration Intensity
Damping
Energy Dissipation
Spatial Trends
Loads
Simulation
Duhamel Integral
Condition Rating
Risk IndexDecision Support
Do Nothing
Intervention
Immediate Action
Fatigue Counting
Compare to Codes
KPi‘s
Permanent Monitoring(System Response)
Basic (detailed)Measurement
Compensation Environmental Influence
MONITORING IDENTIFICATION ACTION