A precision polishing grinding head with partition controllable deformation is disclosed, which belongs to the technical field of precision machining equipment, including a partition base, a positioning block is arranged in a center below the partition base, and a plurality of sets of connecting rod assemblies are arranged above the partition base, a curvature adjusting head is connected at a top end of the connecting rod assembly, a flexible polishing head is arranged above the curvature adjusting head, a protective shell is arranged outside the connecting rod assembly, and the flexible polishing head and the protective shell are connected through a grinding head frame, the device is integrally provided with a driving circuit.

The present disclosure relates to devices for wind turbine blades and methods for reducing vibrations in wind turbines. More particularly, the present disclosure relates to devices for mitigating vortex induced vibrations and stall induced vibrations, wind turbine blades comprising such devices, and methods for reducing wind turbine vibrations when the wind turbine is parked, especially during wind turbine installation and/or maintenance. A method for mitigating vibrations of a parked wind turbine comprises arranging a device in an inactive state with a wind turbine blade; and causing the device to transition to an active state in which the device grips the wind turbine blade more strongly than in the inactive state.

SMA actuators and related methods are described. One embodiment of an actuator includes a base; a plurality of buckle arms; and at least a first shape memory alloy wire coupled with a pair of buckle arms of the plurality of buckle arms. Another embodiment of an actuator includes a base and at least one bimorph actuator including a shape memory alloy material. The bimorph actuator attached to the base.

Provided is a film actuator. The film actuator includes a substrate, transformation wires disposed on the substrate to be spaced apart in a first direction parallel to the substrate, fixed wires disposed to be spaced apart from the transformation wires in the first direction and disposed on both sides of the transformation wires, respectively, and fixing blocks disposed on the transformation wires and the fixed wires to be spaced apart in a second direction parallel to the substrate and intersecting the first direction. The transformation wires include a shape memory alloy.