A turbofan engine according to an example of the present disclosure includes, among other things, a fan, a compressor section, a turbine section including a fan drive turbine and a second turbine, an epicyclic gear system with a gear reduction, first and second bearings, and a fan drive shaft interconnecting the gear system and the fan. The fan drive turbine has a first exit area at a first exit point and is rotatable at a first speed. The second turbine has a second exit area at a second exit point and is rotatable at a second speed. A first performance quantity is defined as the product of the first speed squared and the first area. A second performance quantity is defined as the product of the second speed squared and the second area.

Implementations of the present invention relate to devices, systems, and methods for isolating electronic components from input vibrations. The vibration isolation device may passively isolate the housed electronics from substantially all input vibrations. The vibration isolation device may include elastic members to suspend the electronic components within a support frame such that input vibrations are unable to directly influence the electronic components.

The present disclosure relates to a fan blade for a gas turbine engine, the fan blade comprising an aerofoil portion having a leading edge extending from a root to a tip, the radial distance between the leading edge at the root and the leading edge at the tip defining a blade span. A maximum thickness of the cross-sections through the aerofoil portion from a suction surface of the aerofoil portion to a pressure surface of the aerofoil portion perpendicular to the camber line decreases along the blade span from the root to the tip. There is a discontinuity in the rate of decrease of maximum thickness between a radius at 30% of the blade span from the aerofoil root and 70% of the blade span from the aerofoil root. The rate of decrease of the maximum thickness before the discontinuity is less than the rate of decrease of the maximum thickness after the discontinuity.

The present disclosure provides a hair dryer including: a housing, having an air duct, an air inlet and an air outlet both communicated with the air duct; a fixing sleeve, arranged in the air duct of the housing, an inner wall surface of the fixing sleeve being provided with an elastic contact layer; and a fan, embedded in the fixing sleeve and abutted against the elastic contact layer. The present disclosure aims to reduce the fan vibration during the operation of the hair dryer, so as to reduce the noise generated by the hair dryer, thereby mitigating the impact of the noise on users.

Described herein is a blade unit for industrial fans, which comprises: a blade; and a tubular bar, fixed on which is said blade and which has a root portion configured for being engaged by means for connecting said bar to the rotor of a fan. The unit is characterized in that it comprises a further bar mounted within said first tubular bar so as to present a first portion axially constrained to said first bar, and a second portion that is, instead, able to slide with respect to said first bar, in a condition of sliding friction, following upon a deformation due to bending of said first bar.

The present invention relates to a turbomachine blade or vane arrangement having a first turbomachine blade or vane (10), a second turbomachine blade or vane (20) adjacent to it, and at least one tuning element guide housing (30) with at least one cavity, in which at least one tuning element (5) is arranged with play of movement for impact contact with the tuning element guide housing, with the tuning element guide housing being arranged at least in part in a recess (11), in particular in a frame (12), of the first turbomachine blade or vane (10), where the second turbomachine blade or vane (20) has at least one first rib (21) for securing the tuning element guide housing (30) arranged in the recess (11).

A method to increase the damping of a substrate using a face-centered cubic ferromagnetic damping material.

An in-refrigerator blower configured to drive cold air to refrigerator storage rooms with reduced vibration and reduced noise. The in-refrigerator blower includes a drive device, a drive device accommodation portion, and a support portion coupled to the drive device accommodation portion and configured to extend in a radial direction. A plurality of blades extend in a direction different from an extension direction of the support portion. Each of the blades has an entrance angle in the range of 39°-49°, an exit angle in the range of 29.5° to 34.5° in one example. The number of the blades is greater than seven and smaller than nine.

A heat dissipating blower for cooling a condenser in a refrigerator with reduced vibration and reduced noise. The heat dissipating blower includes a drive device configured to generate a rotational force, a fan coupled to the drive device, a support member configured to support the drive device, and a support frame coupled to the support member. The support member includes a fastening portion coupled to the drive device, and a connection frame spaced apart from the support frame. The heat dissipating blower further includes one or more vibration-attenuation members disposed between the connection frame and the support frame.

The invention includes a disc-shaped disc section (30) that is attached to a rotating shaft (6), and blade sections (40) that are provided on a front surface (31) that is one side in an axial direction of the disc section (30). Balance holes (33) for attaching weight-adjusting weight members W thereto are provided at positions where the blade sections (40) are provided in a radial direction, in a rear surface (51) that is the other side in the axial direction of the disc section (30).