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A filament winding apparatus winds yarn impregnated with resin around the surface of a mandrel with a guide member that moves back and forth axially. Yarn winding is initiated while an end of the yarn is held by a holding device provided in a relatively rotatable manner on a rotary shaft. After wind

A filament winding apparatus winds yarn impregnated with resin around the surface of a mandrel with a guide member that moves back and forth axially. Yarn winding is initiated while an end of the yarn is held by a holding device provided in a relatively rotatable manner on a rotary shaft. After winding is started, the yarn extending from the mandrel to the holding device is cut. When winding is finished, the yarn is held with the holding device and the yarn is cut between the mandrel and the holding device with a yarn cutting device.

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A filament winding apparatus winds yarn impregnated with resin around the surface of a mandrel with a guide member that moves back and forth axially. Yarn winding is initiated while an end of the yarn is held by a holding device provided in a relatively rotatable manner on a rotary shaft. After wind

A filament winding apparatus winds yarn impregnated with resin around the surface of a mandrel with a guide member that moves back and forth axially. Yarn winding is initiated while an end of the yarn is held by a holding device provided in a relatively rotatable manner on a rotary shaft. After winding is started, the yarn extending from the mandrel to the holding device is cut. When winding is finished, the yarn is held with the holding device and the yarn is cut between the mandrel and the holding device with a yarn cutting device. s defining the chamber and having a plurality of through openings extending from one surface of the plate to another surface thereof; the one wall capping one end of the openings; and a second plate mounted to the first plate and having a plurality of through openings extending from one surface of the second plate to another surface thereof; the openings attenuating the acoustic energy generated in the chamber. 2. The device of claim 1 wherein the openings of the second plate extend in alignment with the openings of the first plate. 3. The device of claim 1 wherein the openings in the first plate comprise a plurality of cavities extending from one surface of the first plate which are capped by the one wall; and a plurality of orifices extending from the opposite surface of the plate to each cavity. 4. The device of claim 3 wherein the openings in the second plate comprise a plurality of cavities extending from one surface of the second plate, and a plurality of orifices extending from the opposite surface of the plate to each cavity. 5. The device of claim 4 wherein the cavities of the second plate are aligned with the orifices of the first plate. 6. The device of claim 4 wherein the diameters of the orifices are smaller than the diameters of the cavities. 7. The device of claim 1 wherein the openings are uniformly dispersed in each plate. 8. The device of claim 1 wherein the number and size of the openings of each plate are selected to tune the plates to attenuate the dominant noise component of the acoustic energy. 9. The device of claim 1 wherein one of the surfaces of the first plate abuts the one wall. 10. The device of claim 1 wherein the impeller has a plurality of flow passages in fluid flow communication with the chamber, so that the fluid flows through the passages. 11. The device of claim 1 wherein the chamber includes an area for receiving the impeller and a diffuser channel communicating with the area, wherein the first plate is mounted on a wall defining the diffuser channel; and wherein the fluid flows from the area to the diffuser channel. 12. The device of claim 1 further comprising a third plate mounted to another wall extending opposite the one wall and having a plurality of relatively through openings extending from one surface of the third plate to another surface of the latter plate; the other wall capping one end of the latter openings to further attenuate the acoustic energy generated in the chamber. 13. The device of claim 12 further comprising a fourth plate mounted to the third plate and having a plurality of through openings extending from one surface of the fourth plate to another surface thereof to further attenuate the acoustic energy. 14. The device of claim 13 wherein the openings of the fourth plate extend in alignment with the openings of the third plate. 15. The device of claim 13 wherein the openings in the third and fourth plates include a plurality of cavities extending from one surface of each plate and a plurality of orifices extending from the opposite surface of each plate to each of the latter cavities. 16. The device of claim 15 wherein the cavities of the fourth plate are aligned with the orifices of the third plate. 17. The device of claim 15 wherein the diameters of the orifices of the third and fourth plates are smaller than the diameters of the cavities of the third and fourth plates. 18. The device of claim 1 further comprising a conduit connected to the inlet, and a third plate formed on the inner wall of the conduit and having a plurality of relatively through openings extending from one surface of the latter plate to the other; the inner wall of the conduit capping one end of the openings to form an array of resonators to attenuate the acoustic energy generated in the conduit. 19. The device of claim 18 further comprising a fourth plate mounted to the third plate and having a plurality of through openings extending from one surface of the fourth plate to another surface