A rotor arresting device, to a wind turbine and to a method for arresting and/or rotating a rotor. The rotor arresting device comprises a rotor, a rotational assembly, and a static assembly fixed in position, comprising a toothed disk, which can be arranged on the rotational assembly, having a plurality of arresting recesses arranged along a circumference, wherein two adjacent arresting recesses form a tooth, a first arresting module having at least one first arresting element, a second arresting module having at least one second arresting element, wherein the first and the second arresting module can be arranged on the static assembly, wherein the first and the second arresting element are arranged and designed to engage in arresting recesses of the toothed disk, wherein the spacing of the first arresting element from the second arresting element in the circumferential direction of the toothed disk is a non-integral multiple of a tooth tip spacing of the toothed disk.

Provided is a dismantling method of a tower-type wind power generation system in which scaffolding is not required around a tower body. After climbing on a work bench set outside an outer wall of a tower body and removing a lower end part of an upward-tapering part in an upper end part of the tower body over the entire periphery of the tower body, the tower body is sequentially removed from an uppermost part of a cylindrical part of the tower body below the upward-tapering part to gradually dismantle the tower body from the top. The remaining upward-tapering part of the tower body from which the lower end part is dismantled first is supported by a jack provided in an inner column while being lowered, along with the dismantling, into an internal cavity of the cylindrical part of the tower body below the upward-tapering part and is placed on a placement protrusion provided on an inner wall of the tower body. In a case where a low inner column is set, the inner column is suspended from the remaining upward-tapering part, a lower end part thereof is removed, and then the inner column is lowered on the ground in the tower.

A nacelle-mountable lift system for mounting and dismounting a rotor blade of a wind turbine involves a jib crane mountable on the nacelle and a blade sheath. The blade sheath is connectable to the hook of the jib crane by lines attachable to the top end of the sheath. The holder is raiseable and lowerable by a winch mounted on the crane to raise and lower the sheath with the rotor blade retained therein when the rotor blade is disconnected from the hub or to raise and lower the sheath to retain the rotor blade in or release the rotor blade from the sheath when the rotor blade is connected to the hub.

A method for using a vehicle-mounted wire saw for cutting an object (such as a wind turbine blade) includes coupling a wire saw having a continuous abrasive wire to a vehicle, engaging a wire tension to between about 100 PSI and about 5000 PSI, engaging a speed of an engine of the vehicle to between about 500 RPM and 4000 RPM, and cutting the object with the wire saw.

A disassembled wind turbine under repair includes a tower secured to a foundation and a nacelle mounted atop the tower. The nacelle includes a base wall, side walls, a front wall, a rear wall, and a top wall. The front wall includes an opening configured to receive a main shaft of the wind turbine; however, the main shaft and a rotor of the wind turbine have been removed from the nacelle during a repair procedure. As such, the disassembled wind turbine further includes an external platform assembly secured at the opening of the front wall of the nacelle during the repair procedure.

A method for assembling and disassembling a module of gas turbine engine is provided, along with a gas turbine engine configured for modular assembly/disassembly. The engine includes a first shaft and a second shaft. The first shaft connects a compressor section and a first turbine section. The second shaft is connected to the second turbine section. The first and second shafts are rotatable about the engine rotational axis. The second shaft and the second turbine section together form a module that can be assembled, or disassembled, or both from the engine.

An assembly for use in a drive-train of a wind turbine having a transmission, a generator and a module. The module includes a shaft or hub, at least one bearing and a support structure. The shaft of the module or the hub is mounted by the bearing so as to rotate in the support structure. The shaft or the hub can be connected in a rotationally fixed manner to a shaft of the transmission. A rotor of the generator can be fixed to the shaft of the module or to the hub. The support structure can be fixed to a housing of the transmission or the generator. At least one assembly safety device is provided in order to be able to fix the rotor of the generator. When the rotor of the generator is fixed by way of the assembly safety device, the module can be fitted and removed.

A nacelle for a wind turbine includes a nacelle roof and a first wind turbine component, wherein the nacelle roof is configured to cover the first wind turbine component, the nacelle roof including a first sliding section and a second sliding section, wherein the first sliding section and/or the second sliding section is configured to slide over at least a part of the surface of the nacelle roof, wherein the first sliding section and the second sliding section are moveable between a closed position, in which the first wind turbine component is covered by the nacelle roof, and an opened position, resulting in an opening of the nacelle roof through which the first wind turbine component is hoisted.

A fluid film bearing for a rotor hub of a wind turbine is provided including a first part and a second part rotatably coupled to each other about a longitudinal axis. The first part includes an annular first sliding surface extending in the circumferential direction of the fluid film bearing along the first part. In addition, the second part includes a support structure and a first group of bearing pads coupled to the support structure and having a bearing pad sliding surface configured to slide on the first sliding surface. In addition, the support structure includes a plurality of openings for replacing the bearing pads.

A fluid film bearing for a rotor hub of a wind turbine includes a first part and a second part rotatably coupled to each other about a longitudinal axis. The first part includes an annular first sliding surface extending in the circumferential direction of the fluid film bearing along the first part. In addition, the second part includes a support structure and a first group of bearing pads coupled to the support structure and having a bearing pad sliding surface configured to slide on the first sliding surface. In addition, the fluid film bearing further includes a seal arranged between the first part and the second part.