Blade Test Center A/S (BLAEST) - full-scale test of wind turbine blades up to 85 meters
At BLAEST, we conduct full-scale tests of wind turbine blades with extreme loads as well as accelerated fatigue tests.
Dedicated and extensive testing
It is crucial for your market position to deliver fully functional and high quality blades fast and continuously. Therefore, blades testing requires efficient processing, fast and without any disruption. The employees at BLAEST have both extensive experience and total dedication to contribute to your production efficiency.
Transport of elements to the test site is carried out according to client agreement. However, there is also the possibility of establishing test facilities on-site.
Blade certification and testing
Flexible testing is the key to satisfied customers. We make every endeavour to match exactly your need for blade testing with the goal to facilitate your focus on production efficiency.BLAEST is accredited by DANAK in compliance with ISO17025 for testing of wind turbine rotor blades. Reference methods:
- EN61400-23 : 2014
- GL Wind 2010
The test centre offers a wide range of tests and services.Accredited services
- Static load test (read more in the FAQ)
- Fatigue load test (read more in the FAQ)
- Modal analysis (read more in the FAQ)
- Determination of natural frequencies
- Ultimate strength test
- Resistance measurements of Lightning Protection Systems.
- Thermographic (IR) investigation
- Acoustic emission (AE) investigation
- Mechanical stiffness tests
- Mass distribution measurements.
What is a static load test?
Static tests are carried out as a multipoint load application in vertical direction or in other angles as the customer may require. BLAEST uses a mechanical load system which introduces loads in multiple points simultaneously. The load introduction system works with very small deviations between the individual load points and can complete a static test within few minutes. Data are recorded with a sample rate of up to 250 Hz.
What is a fatigue test?
Fatigue load blade tests are performed to determine inherent fatigue properties of a blade, predicting the long-term performance during the designed blade lifespan. The reported data enables certifying bodies to compare measured data to the calculated data of the design criteria. Thus full-scale blade fatigue tests are often an essential part of the approval process. Fatigue tests may be performed in different ways.
Edgewise fatigue load testing is normally performed in horizontal orientation and excitations are forced by rotating eccentric masses. For smaller blades, fatigue testing can be executed by using rotating eccentric masses as well. Mainly for larger blades, BLAEST has two types of exciters mounted on the floor: An electric driven exciter with rotating masses, mounted on a seesaw. Furthermore, BLAEST has a newly developed lightweight electrically driven exciter with a pushrod connection to the blade.
What is modal analysis?
Modal analysis is the process of determining the modal parameters, which are then sufficient for formulating a mathematical dynamic model. Modal analysis can be accomplished through experimental techniques. It is the most common method for characterization of the dynamic properties of a mechanical system.
The free dynamic response of the wind turbine blade may be reduced to a discrete set of modes. The modal parameters are:
- the modal frequency
- the modal damping
- the mode shape.