Certain embodiments of the present disclosure provide an acoustic inlet barrel of an engine. The acoustic inlet barrel may include an inner barrel configured to provide a boundary for directing airflow through the engine. The inner barrel may include an inner face sheet separated from an outer face sheet by an acoustic core. The inner barrel may include a plurality of elongated, non-circular perforations formed through the inner face sheet.

Certain embodiments of the present disclosure provide an acoustic inlet barrel of an engine. The acoustic inlet barrel may include an inner barrel configured to provide a boundary for directing airflow through the engine. The inner barrel may include an inner face sheet separated from an outer face sheet by an acoustic core. The inner barrel may include a plurality of elongated, non-circular perforations formed through the inner face sheet.

An intelligent automatic processing apparatus for spoke holes of bicycle rims is revealed. The apparatus includes a seat pivotally connected to a machine body and provided with a rotary base. A rim is clamped and fixed by clamping jaws on the rotary base and a control unit drives an incline unit to incline the seat connected at an angle desired for control of slopes of holes being drilled. The control unit also drives a rotary indexing power source to rotate the rotary base at different angles according to the numbers and positions of spoke holes desired. Thus a drilling assembly drills the spoke holes on the rim. Thereby the spoke holes with various angles can be drilled on different positions of the rim by the control unit which adjusts positions and inclination angles of the rim accurately. Therefore, the drilling of the spoke holes is more convenient.

A drilling system includes a single robotic drilling unit having a drill end effector positioned inside a barrel section configured as a composite sandwich structure having an inner face sheet. The robotic drilling unit is operable to drill a plurality of perforations into the inner face sheet using the drill end effector. The robotic drilling unit is configured to index a hole pattern of the perforations to one or more cell walls of a honeycomb core of the composite sandwich structure. The robotic drilling unit is configured to form the hole pattern in the inner face sheet such that the perforations are located at a spaced distance from the cell walls of the honeycomb core.

A drilling system includes a single robotic drilling unit having a drill end effector positioned inside a barrel section configured as a composite sandwich structure having an inner face sheet. The robotic drilling unit is operable to drill a plurality of perforations into the inner face sheet using the drill end effector. The robotic drilling unit is configured to index a hole pattern of the perforations to one or more cell walls of a honeycomb core of the composite sandwich structure. The robotic drilling unit is configured to form the hole pattern in the inner face sheet such that the perforations are located at a spaced distance from the cell walls of the honeycomb core.

Method and equipment for repairing the roots of wind turbine blades, by drilling on the root of the blade, and through the ring thereof, radial bore holes located in positions that radially match the axial threaded blind holes of the ring; grinding and drilling the axial threaded blind holes to remove the thread, and to achieve the extension of the ground axial holes until they reach the matching radial bore hole; introducing, into each radial bore hole, a pin provided with a threaded diametral passage aligned with a threaded axial hole of the ring; screwing bolts into the axial threaded blind holes and threaded diametral passages, for fastening the blade to the hub of the wind turbine. The equipment has a support that can be fastened to the reinforcement ring and a head for carrying radial and axial drilling tools.

Method and equipment for repairing the roots of wind turbine blades, by drilling on the root of the blade, and through the ring thereof, radial bore holes located in positions that radially match the axial threaded blind holes of the ring; grinding and drilling the axial threaded blind holes to remove the thread, and to achieve the extension of the ground axial holes until they reach the matching radial bore hole; introducing, into each radial bore hole, a pin provided with a threaded diametral passage aligned with a threaded axial hole of the ring; screwing bolts into the axial threaded blind holes and threaded diametral passages, for fastening the blade to the hub of the wind turbine. The equipment has a support that can be fastened to the reinforcement ring and a head for carrying radial and axial drilling tools.

The present invention relates to an integrated processing machine for positioning, trimming and punching of the ceiling splicing structure, comprising a rack and a mounting base for processing at the lower part of the rack, which is provided with a lifting and clamping device passing through the rack cooperating with the splice plate, the upper part of the rack is provided with a processing port, which cooperates with a trimming and positioning device, the trimming and positioning device comprises a lifting cylinder for trimming and positioning disposed on the mounting base for processing, the lifting cylinder for trimming and positioning is connected with a mounting base for trimming and positioning, the mounting base for trimming and positioning is provided with a first trimming knife and a second trimming knife which cooperates with the two splice plates respectively, and the mounting base for processing is provided with a processing mechanism matching with the processing mating port and cooperating with two splice plates; In the present invention, the trimming and positioning device and the processing device are designed to cooperate with each other, the trimming and positioning device is able to complete the trimming of the side slits of the splice plates while positioning the two splice plates without interfering with the operation of the hole and groove processing device, which greatly improves the efficiency of integrated processing.

Certain embodiments of the present disclosure provide an acoustic inlet barrel of an engine. The acoustic inlet barrel may include an inner barrel configured to provide a boundary for directing airflow through the engine. The inner barrel may include an inner face sheet separated from an outer face sheet by an acoustic core. The inner barrel may include a plurality of elongated, non-circular perforations formed through the inner face sheet.

Certain embodiments of the present disclosure provide an acoustic inlet barrel of an engine. The acoustic inlet barrel may include an inner barrel configured to provide a boundary for directing airflow through the engine. The inner barrel may include an inner face sheet separated from an outer face sheet by an acoustic core. The inner barrel may include a plurality of elongated, non-circular perforations formed through the inner face sheet.