Honda Motor Co., Ltd.

Shu Taguchi

Yuta Ito

Ken Ito

Daiki Hama

Tatsuro Akasaka

In an impeller comprising a rotatable hub and a plurality of blades provided circumferentially on the rotatable hub at regular intervals, the blades including first blades each having a first vibrational eigenvalue and second blades each having a second vibrational eigenvalue, the first blades and the second blades are circumferentially arranged with a predetermined regularity in a circumferential direction in an alternating manner and with a mistune distribution that does not include a mistune component having a wavenumber twice a number of nodal diameters computed fromwhere H is a rotational order of resonance under harmonic forced vibration, ND is a nodal diameter number in a traveling wave mode, n is an integer and N is a number of the blades.

Method for manufacturing impeller

Provided is a vibration reduction device for stator vanes () positioned behind rotor blades () in a turbo machine, comprising an annular base member () having a cylindrical shape concentric around a central axis of the casing and supporting base ends of the stator vanes which extend radially inward from an inner circumferential surface of the base member, an elastomeric damping member () surrounding and in slidable contact with an outer circumferential surface of the base member, and a preloading member () surrounding an outer circumferential surface of the elastomeric damping member and configured to apply a preload directed radially inward to the elastomeric damping member.

Turbo machine with vibration reduction device for stator vanes

A turbomachinery includes a casing, a rotor shaft rotatably attached to the casing, a first blade row fixed to either one of the rotor shaft or the casing, and a second blade row fixed to either one of the rotor shaft or the casing and arranged adjacent to the upstream side or downstream side of the first blade row, wherein the turbomachinery sets the number of first blades and the number of second blades in a manner that the interblade phase angle difference of the second blade row is &#xb1;180&#xb0;.

Turbomachinery and method for designing turbomachinery

A vibration reducing device for a gas turbine engine includes a rotating shaft containing a first mass member, a plurality of bearings rotatably supporting the rotating shaft, and a stationary body supporting the bearings. An annular second mass member having an internal diameter thereof larger than an external diameter of the rotating shaft is rotatably supported in a contact state at a position on the rotating shaft, at which position centrifugal whirling vibration is generated due to imbalance of the first mass member. Therefore, due to the second mass member being eccentric in an opposite phase with respect to the rotating shaft eccentrically undergoing centrifugal whirling, it is possible to counterbalance a centrifugal force acting on the first mass member with an inertial force acting on the second mass member, thus enabling a damping effect to be exhibited and reducing effectively the centrifugal whirling vibration of the rotating shaft.

Vibration reducing device for gas turbine engine

In an axial compressor including a row of rotor blades () provided on a rotational shaft () around a central axial line of the rotational shaft at a prescribed pitch, and a row of stator vanes () provided on a casing around the central axial line at a prescribed pitch so as to adjoin the row of rotor blades on an upstream or downstream side thereof, the rotor blades each extend along a radial line (R) emanating from the central axial line, and the stator vanes each extend along a slanted line (I) that is slanted with respect to a corresponding radial line in a circumferential direction.

Variable stator vane structure of axial compressor

In a bearing device, a squeeze film damper includes an annular oil chamber forming an oil film between an outer periphery of an outer race and an inner periphery of a bearing retaining member. A film thickness adjustment portion adjusting a film thickness of the oil film is provided in at least one location in a peripheral direction of the oil chamber. Therefore, it is possible, by changing a distribution in a peripheral direction of dynamic characteristics of the oil film of the squeeze film damper with a simple structure to thus freely adjust a forward mode tendency or a backward mode tendency for centrifugal whirling, to enhance damping performance of the squeeze film damper. Accordingly, centrifugal whirling of a rotating shaft is suppressed effectively by the squeeze film damper with a simple structure.

Bearing device

In a centrifugal compressor including an impeller () having rotor blades (), a shroud () surrounding the impeller, and a diffuser () having stator vanes (), the shroud () includes a plurality of openings () opening toward the impeller () in a part thereof adjacent to an impeller outlet portion (B), and a communication passage () communicating the openings () with one another, the openings including first openings (A) that are arranged at a same interval as the stator vanes, and second openings (B) arranged intermediately between the adjacent first openings.

Centrifugal compressor

In a bearing device, a squeeze film damper includes an annular mass member disposed in a floating state between an outer periphery of an outer race and an inner periphery of a bearing retaining member, a first squeeze film damper part formed between the outer periphery of the outer race and an inner periphery of the annular mass member, and a second squeeze film damper part formed between an outer periphery of the annular mass member and the inner periphery of the bearing retaining member. Therefore, due to the floatingly supported annular mass member being eccentric with the opposite phase to a rotating shaft, which is eccentric and undergoes centrifugal whirling, an inertial force acting on the annular mass member counteracts the centrifugal force acting on the rotating shaft, thus enabling a damping effect to be exhibited.

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Wako, Japan

Shu Taguchi