Artikel
Rotorblätter, erklärt von den Ingenieuren, die sie untersuchen
Wie Rotorblätter versagen, wie sie gefertigt werden, was Schäden kosten und wie man sie findet. Geschrieben für Versicherer, Betreiber, Kreditgeber und Ingenieure, von Apex Wind.
Mohammed Fajar · 9 Min. Lesezeit
Rotorblattversagen: Ursachen, Warnzeichen und wie es untersucht wird
Was Rotorblattversagen an Windkraftanlagen verursacht, welche Warnzeichen ihm vorausgehen, und wie eine unabhängige Untersuchung einen Einzelfall von einem Serienfehler unterscheidet.
Artikel lesenMohammed Fajar · 8 Min. Lesezeit
Rotorblattschäden im Versicherungsfall: was Underwriter und Schadenregulierer von der Untersuchung brauchen
Woran ein Versicherungsfall nach einem Rotorblattschaden hängt: Ursache, Mangelausschlüsse, Serienrisiko und Regress. Was Underwriter, Schadenregulierer und Makler von der technischen Untersuchung verlangen sollten, und wann.
Artikel lesenMohammed Fajar · 7 Min. Lesezeit
Rotorblattreparatur: was am Turm möglich ist, was das Blatt nach unten bringt, und wer entscheiden sollte
Welche Rotorblattreparaturen am Turm per Seilzugang oder Plattform möglich sind, welche das Blatt am Boden oder im Werk erfordern, was eine Feldreparatur begrenzt, und warum die Reparaturentscheidung unabhängig vom Reparaturdienstleister getroffen werden sollte.
Artikel lesenMohammed Fajar · 7 Min. Lesezeit
Einen Rotorblatt-Inspektionsbericht richtig lesen: was die Schadenskategorien bedeuten und was man nachfordern sollte
Wie man einen Rotorblatt-Inspektionsbericht kritisch liest: was die Schadenskategorien 1 bis 5 tatsächlich bedeuten, was ein guter Bericht enthalten muss, wo Berichte typischerweise in die Irre führen, und was man vom Inspektionsdienstleister verlangen sollte, bevor man handelt.
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Weitere Artikel, auf Englisch
Mohammed Fajar · 10 Min. Lesezeit
Wind turbine blade inspection checklist: what to check, how, and what each finding means
A working blade inspection checklist for external, internal, root and post-event inspections, with the method for each item and what the finding means for the repair decision.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
When does blade damage require repair? Damage categories and the decision behind them
How blade damage categories work, when damage is cosmetic, when it is structural, and how owners and insurers decide between repair now, repair at the next campaign and monitor.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Erosion, lightning or a bond line crack? How to distinguish blade damage types
How to tell blade damage types apart from an inspection image: erosion against coating failure, lightning against impact, bond line cracks against laminate cracks, and defect against repair.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Trailing edge cracks: what causes them, how they are diagnosed, and when they are structural
Trailing edge cracks are the most common structural finding on wind turbine blades. What causes them, how to diagnose one from an inspection, and when the crack stops being a repair item.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Lightning damage to wind turbine blades: diagnosis, receptor testing and what IEC 61400-24 requires
How lightning damages a wind turbine blade, how a strike is diagnosed after the event, how the protection system is tested, and what IEC 61400-24 requires of it.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
IEC 61400-5 explained: what the blade standard requires, and what it does not
IEC 61400-5 is the first international standard dedicated to wind turbine blades. What it covers, how it relates to blade testing and certification, and what an owner or insurer can ask for under it.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Measuring blade aerodynamic flow state: what attached and detached flow cost in power
How a blade aerodynamic flow state sensor on two V27 turbines split the power curve: attached flow +15%, detached flow -30%, and a per-blade pitch trim method.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Wind turbine blade monitoring compared: drones, sensors, SCADA and satellites
Wind turbine blade monitoring compared: drones, robots, blade sensors, SCADA anomaly detection and Sentinel satellites. What each detects, misses and costs.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Wind turbine blade icing: production losses, loads and what owners can do
How wind turbine blade icing forms, what it costs in production and loads, how ice is detected and mitigated, and how icing damage is told from other causes.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Leading edge erosion: how much energy it costs, and when it turns structural
How leading edge erosion starts and progresses, what studies say it costs in energy and revenue, and when it becomes a structural and insurance question.
Artikel lesenMohammed Fajar · 10 Min. Lesezeit
The wind turbine blade manufacturing process, and where defects enter
How the wind turbine blade manufacturing process works, the defect each stage can introduce, from wrinkles to kissing bonds, and what a factory audit looks for.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
Laminate wrinkle wind turbine blade: how one defect becomes a serial defect
How a laminate wrinkle wind turbine blade defect forms in the spar cap, why it cuts compressive strength, how it is found, and when it becomes a serial defect.
Artikel lesenMohammed Fajar · 8 Min. Lesezeit
End-of-warranty blade inspection: what to require, and what the OEM's own inspection will not tell you
What an end-of-warranty blade inspection must cover before the manufacturer's liability ends: scope, method, internal survey, baseline comparison, known-issue lists, and the claims list. Why the OEM's own inspection is not enough, and when to start.
Artikel lesenMohammed Fajar · 7 Min. Lesezeit
Edgewise vibrations in wind turbine blades: causes, the damage they do, and what SCADA shows
What edgewise vibration of a wind turbine blade is, why edgewise modes are lightly damped, when they occur in operation and at standstill, the trailing edge and root damage they cause, and how to see them in SCADA and inspection data.
Artikel lesenMohammed Fajar · 8 Min. Lesezeit
Wind turbine blade lifetime extension: what the blade assessment must cover
What a blade assessment for wind turbine lifetime extension has to include: the design fatigue basis against site loads, the as-built and as-inspected defect state, repair history, known serial issues, erosion, lightning protection, root condition and material ageing. Why a loads-only analysis is not enough.
Artikel lesenMohammed Fajar · 7 Min. Lesezeit
Wind turbine blade delamination: causes, detection, and when it is structural
What wind turbine blade delamination is, where it comes from in manufacture, impact and fatigue, how it is detected by tap test, ultrasound, thermography and internal inspection, and when a delamination is a structural finding.
Artikel lesenMohammed Fajar · 8 Min. Lesezeit
Wind turbine blade cracks: edge, transverse and shell cracks, and what each means structurally
How to read a wind turbine blade crack: transverse cracks over the spar cap, longitudinal cracks along bond lines, trailing and leading edge cracks, root transition cracks and coating cracks. Which are structural, which are cosmetic, and how to tell.
Artikel lesenMohammed Fajar · 8 Min. Lesezeit
Offshore blade failures: what differs from onshore, and what an independent investigation covers
Why offshore wind turbine blade failures cost more, are harder to investigate and carry larger fleet exposure than onshore. Access, evidence recovery, very large blades, serial risk, and what an independent expert investigation covers offshore.
Artikel lesenMohammed Fajar · 8 Min. Lesezeit
IEC 61400-23 explained: what full-scale blade testing proves, and what it does not
IEC 61400-23 governs full-scale structural testing of wind turbine blades: static tests, fatigue tests and property measurements. What a passed test proves about the design, what it cannot prove about production blades, and what an owner or insurer should ask for.
Artikel lesenMohammed Fajar · 10 Min. Lesezeit
Blade root insert failure: why root connections fail and how to catch it early
How blade root insert failure develops in bonded inserts and T-bolt roots, what inspection can find before blade detachment, and how the cause is established.
Artikel lesenMohammed Fajar · 8 Min. Lesezeit
Blade condition monitoring systems: what root sensors, strain gauges and acoustic monitoring detect, and when they are worth installing
Blade condition monitoring systems compared by what they physically measure: root load sensors, strain gauges, accelerometers, acoustic emission and cavity microphones. What each detects, what it misses, when it pays, and what to ask a vendor.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
The cable-stayed rotor: what the Vestas patents cover and why it matters for large blades
How the cable-stayed rotor works, what the Vestas patents co-invented by Mohammed Fajar cover, what is publicly known, and what it means for large blades.
Artikel lesenMohammed Fajar · 9 Min. Lesezeit
The technology qualification wind turbine blades over 100 m will need: an FMECA-based plan
What technology qualification wind turbine blades over 100 m need: a full FMECA mapped to DNV-RP-A203 evidence, from a 2026 paper Mohammed Fajar co-authored.
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