industrial fiber optic measurement
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fos4X Thalkirchner Str. 210, DE, 81371 München, T: +49 89 99 95 42-00, Email: [email protected]://www.facebook.com/fos4X-GmbH-600618833291489/https://www.youtube.com/user/fos4X
fos4Blade Research&Development
The perfect analysis tool for engineers to assess the mechanical performance of rotor blades.
The fos4Blade Reasearch&Development measurement system is successfully utilized by several blade manufacturers. The system is usually optimized according to the customer‘s needs in order to gather essential information about existing as well as newly designed rotor blades.
fos4X is enthusiastic about wind energy applications and is eager to support you with the setup, integration, installation and com-missioning of your fos4Blade Research&Development system.
If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeR&D
Edge and flapwise vibration analysis
edge-wise
flap-wise
Blade VibrationVibration AnalysisThe vibration analysis of a rotor blade is done using fiber optic acceleration sensors fos4Acc at different positions within the blade. Valuable information about the blade’s mechanical performance can be derived from the gathered data and a subsequent eigenfrequency analysis. This enables several interesting applications like ice detection, health monitoring and many more.
The gathered data is used to:+ Validation of the vibration characteristics+ Determination of eigenfrequencies+ Continuous data analysis over the blade’s entire lifetime
Measurement of Bending MomentsIn order to enable the measurement of bending moments at several cross section of a rotor blade, four strain sensors fos4Strain expert are applied at every desired radius.
The calibration can either be conducted at a test facility or later at the turbine. The fiber optic working principle allows to reliably determine flap and edgewise bending moments over the blade’s entire lifetime.
The gathered data is used to:+ Validation of theoretical models+ Evaluation of bending characteristics+ Flutter and imbalance recognition+ Continuous data analysis over the blade’s entire lifetime
Moment Edge Blade 1
Edge-wise bending moment at radius 35 m (green), 45 m (red) and 60 m (blue)
Dynamic TorsionThe torsion sensor fos4Twist (prototype) is able to measure the torsion angle at several cross sections of a rotor blade. Innovative fiber optic technology enables lightning-resistant twist measurements up to the tip of the blade.
The gathered data is used to:+ Validation of theoretical models+ Improved control of pitch angle+ Gathering data of correlated bending and torsion effects
Blade Angle during operation
Blade Angle
CERTIFICATE NO. TC-GL-013A-2014
Function: + User Interfaces and databases for continuous analysis+ Complication-free implementation of new functions (plugins) and new
applications as well as custom algorithms
Developed for:+ Fusion of gathered data
of mulitple sensors+ State of the art data analysis+ Machine control
Existing Plugins:+ Ice Detection+ Bending moment calculation+ Structural health monitoring
fos4Blade IceDetection
Ice accretion leads, due to the increased mass of the blade, to changes in the vibrational finger print of a rotor blade. These variations are reliably detected using the purely fiber optic fos4Acc 2D vibration sensors.
Whereas currently used systems estimate icing via instru-ments on the nacelle, the fos4Blade IceDetection system detects ice accumulation directly on the blade. This leads to a minimal down time with keeping maximal safety.
If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeIceDetection
fos4Blade StructuralHealthMonitoring
If rotor blades are damaged or weakend, a detectable shift in the eigenfrequencies occurs.
The fos4Blade StructuralHealthMonitoring system‘s high sensitivity allows the detection of minimal changes of the state of the blade. The system is therefore ideal for appli cations like early recognition of damage and overload protection.
If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeStructuralHealthMonitoring
fos4Blade LoadMonitoring
The real-time measurement of the in-situ load of a rotor blade opens up a completely new field of possibilities for sophisticated control strategies, optimized turbine operation and many more other applications.
The fos4Blade LoadMonitoring system offers reliable and high-available blade root load measurements and is ready to be integrated in all turbine types of every manufacturer.
If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeLoadMonitoring Schematic representation of the functionality of individual pitch control to
reduce lateral excitation
Individual Pitch Control
Innovative Fiber Bragg Grating (FBG) measurement technology
Fiber Bragg Gratings are interference filters incsribed into fiber optic cables that are able to translate mechanical strain into a shift in the reflected wavelength.
+ The reflected wavelength changes relative to the strain at the optical fiber.
+ The fiber typically has a diameter of 250 µm+ The length of a FBG sensor is 3 – 8 mm+ FBG sensors are insusceptible to electromagnetic interference
fos4X revolutionized fiber optic measure- ment technology with a groundbreaking patent over 10 years ago. Fiber optic strain, temperature and acceleration sensors can withstand over 1000 times more load cycles than comparable electrical sensors.
Measuring signal
“White” Light
ε
Strain
Fiber-Bragg-Grating
Fiber optic measurement technology therefore offers perfect solutions for many areas and applications such as process control, test benches, structure monitoring, prototype testing and many more…
If you want to find out more about fiber optic measurement technology visit us at www.fos4x.de
Data analysis and algorithms
Step IData aquisition
fos4Strain
fos4Temp
fos4Acc
Step IIData processing
Optional Data of WEC
Bending
Vibration Ice Detection
Structural HealthMonitoring
Overload Protection
Eigenfrequency Analysis
Active LoadReduction
Step IIIComputation
Pitch Angle
Rotor Speed
Calibration
Step IVThreshold analysis
Ice?Damage?Overload?
fos4Test & Cabinet
Standard Interface
industrial fiber optic measurement
CERTIFICATE NO. TC-GL-013A-2014
fos4X Thalkirchner Str. 210, DE, 81371 München, T: +49 89 99 95 42-00, Email: [email protected]
fos4Blade StructuralHealthMonitoring
+ Online monitoring of rotor blade condition+ Detecion of typical blade failures+ Available as retrofit solution for different types
of wind turbines
fos4Blade LoadMonitoring
+ Reliable measurement of load at the root of the blade+ Suitable for active load control + Life time estimations
Cabinet
+ Protection of measurement equipment against lightning, humidity, salty fog and thermal impact+ Stainless steel cabinet suitable for wind turbine applications+ 110 V or 230 V (AC) or 24 V (DC) power supply+ Extended temperature range (-40°C to 65°C)+ Wireless interface available
Break-Out-Box
+ Box for joining optical cables+ Mounted at bulk of the blade+ IP65, offshore capability
fos4Test dyn
+ Fiber-optic measurement device for dynamic measurements
+ Up to 50 kHz sampling rate + Standardized measurement in accordance with
IEC 61400-13
Blade Hub Connection
+ Connection between bulkhead and hub in order to reliably transmit optical data+ Suitbable for pitch angles from ± 540°+ In compliance with industry specific HSE regulations
fos4Blade Research&Development
+ Platform to gather all relevant mechanical rotor blade loads
+ Customer specific measurement system setup+ Qualification of simulation models, distributed blade
load measurements, flutter and mass imbalance recognition, overload protection
fos4Blade IceDetection
+ Certified by DNV-GL+ Precise ice detection (Minimum 10 kg)+ Resumes operation automatically when ice-free+ Available as retrofit solution for different types
of wind turbines
fos4Twist
+ Dynamic and total torsion angle from hub to tip of the blade
+ Measurement at any radius+ Measurement range ± 30°
fos4Strain
+ Fiber-optic strain sensor insusceptible to electro-magnetic interference
+ Longer Life-cycles and larger measurement range than conventional strain sensors (>>108 Load cycles
at 0,2 % strain)+ Athermal design+ Very compact design available
Data processing capabilities
+ Realtime data processing (for control systems)+ Framework for customer specific algorithms+ Webserver for configuration and visualization+ Internal SSD storage (up to 1TB)+ WIFI bridge for connectivity between nacelle and hub
fos4Test nSens
+ Fiber-optic measurement device for distributedmeasurements
+ With the ability to measure up to 72 sensors per device+ Up to 100 Hz sampling rate per sensor
fos4Temp
+ Fiber-optic temperature sensor insusceptible toelectromagnetic interference
+ Temperature range -40°C to 600°C
fos4Acc
+ Fiber-optic acceleration sensor insusceptible to electromagnetic interference+ Enables 3D accelerations measurements at the tip of the blade+ Suitable for vibration analyses+ Very compact design available
Possible Interfaces
+ Ethernet+ CAN & CANopen+ PROFINET+ Modbus TCP/IP+ Fast implementation of customer specific interfaces
