99results about How to "Less noisy" patented technology

A wind turbine blade is situated on a wind turbine and includes a side and a tip. The blade is configured to rotate about an axis upon an impact of a wind flow on the blade. An active flow modification device is disposed on the blade. The active flow modification device is configured to receive active flow instructions and to modify the wind flow proximate to the blade. The resulting wind turbine blade uses these active flow modifications to achieve reduced loads, reduced aerodynamic losses, reduced noise, enhanced energy capture, or combinations thereof.

The present invention discloses a new type of extremely low-noise phase-frequency detector (PFD) 500, broadband from DC to multi-GHz RF frequencies for PLL synthesizer applications. Free of any feedback mechanisms, thus inherently fast, it operates close to transition frequency fT of IC processes or frequency limits of discrete mixers. The PFD 500 utilizes complex SSB conversion in both the in-phase and quadrature arms, delaying the in-phase arm in 530, beating the delayed signal 124 with the un-delayed quadrature signal 122 in mixer 126. The output 128 contains both the frequency difference and the phase difference information between the two signals 118 and 520, providing both the frequency-discrimination (FD) and the phase detection (PD) functions. Utilizing standard mixers the PFD 500 can achieve superior CNRs of 180 dBc / Hz at multi-GHz RF. Additionally, utilizing the FD / FM demodulation capability, the present invention improves phase noise of various signals and linearity of FM modulators.

An inline centrifugal mixed flow fan (20) includes an axially extending intake conduit (22). An inlet cone (28) is disposed at an intake end (24). An impeller (30) is disposed downstream of the inlet cone and includes a centrally disposed wheel-back (32) rotated by an electric motor (44), plural fan blades (34) extending radially outwardly from the wheel-back and a wheel cone fixedly (36) attached to and circumscribing the wheel blades. A driver chamber (48) downstream of the impeller includes plural radially extending straight vanes (50) to direct air to an outlet end (26). The fan is configured to achieve reduced sound level and increased efficiency.

This invention concerns a machine for the drying, polishing and burnishing cutlery and other metal tableware. It consists of a tank suspended upon a base and moved by a vibrating device, having a treatment channel (15) designed to receive a drying material and the articles for treatment. The treatment channel (15) rises in a spiral from an entrance chute at the loading mouth to an exit passage or chute for the articles and has, in a transverse cross-section, a U-shaped bottom (22) defined by a substantially cylindrical concave surface and, lengthways, by a series of straight segments (23) which alternate with and are joined to curved segments (24), without sharp edges or corners. Ideally, the channel has a steeper gradient towards the exit.

An electromagnetic machine with a deformable membrane (1) includes at least one fixed part which can direct a magnetic flow interacting with at least one moveable part (12) having regions which are magnetically polarized in order to ensure that alternative displacement of the moveable part (12) corresponds to an alternative variation of the magnetic flow in the fixed part, the moveable part (12) being kinetically linked to an edge (5) of the membrane (1) such that an undulation of the membrane (1) corresponds to an alternative displacement of the moveable part (12), wherein the fixed part and moveable part (12) are arranged in such a way that the moveable part (12) can be displaced in a rotating manner.

A system for pinpointing CDP sources in a two-way HFC CATV network comprises a headend CPD radar unit, a return path switch, and a computer. The radar unit is coupled to a headend combiner. The return path switch is coupled between the nodes of the CATV network and the radar unit. The computer is connected to the radar unit and the return path switch. The computer controls the radar unit and switch and causes them to perform constant sequential CPD monitoring of the nodes of the network. The system further comprises a portable radar-calibrator unit that is carried into the field and connected to various points along the coaxial cable portion of the network. The portable radar unit is used to detect CPD sources in the field and to calibrate the network as to time delay. The portable unit communicates with the headend radar unit through the CATV network.

A percussive massage device includes an enclosure having a cylindrical bore that extends along a longitudinal axis. A motor has a rotatable shaft that rotates about a central axis perpendicular to the longitudinal axis. A crank coupled to the shaft includes a pivot, which is offset from the central axis of the shaft. A transfer bracket has a first end portion coupled to the pivot of the crank. A flexible transfer linkage has a first end coupled to a second end portion of the transfer bracket. A piston has a first end coupled to a second end of the transfer linkage. The piston is constrained to move within a cylinder along the longitudinal axis of the cylindrical bore. An applicator head has a first end coupled to a second end of the piston and has a second end exposed outside the cylindrical bore for application to a person receiving treatment.

A stool includes a collapsible frame, a triangular seat and a back. The frame includes a bottom hub with three telescopingly adjustable legs and enlarged feet. A top hub is rotatably coupled to the bottom hub for 360 degree rotation, and includes three seat-supporting arms that extend from the top hub, and a pair of uprights that extend from two of the arms. The seat hook-attaches to loops on ends of the arms, and the back extends between the uprights. The legs and arms are pivoted to their respective hubs, but the pivots are slightly frictional so that the arms and legs remain in adjusted positions, with stops on the hubs stopping the legs and arms in their upwardly-pivoted use positions. The frictional pivots include lubricious plastic that facilitates quiet unfolding of the stool, which is important when hunting.

A system and method for harvesting the kinetic energy of a fluid flow for power generation with a vertically oriented, aerodynamic wing structure comprising one or more airfoil elements pivotably attached to a mast. When activated by the moving fluid stream, the wing structure oscillates back and forth, generating lift first in one direction then in the opposite direction. This oscillating movement is converted to unidirectional rotational movement in order to provide motive power to an electricity generator. Unlike other oscillating devices, this device is designed to harvest the maximum aerodynamic lift forces available for a given oscillation cycle. Because the system is not subjected to the same intense forces and stresses as turbine systems, it can be constructed less expensively, reducing the cost of electricity generation. The system can be grouped in more compact clusters, be less evident in the landscape, and present reduced risk to avian species.

A projection display apparatus comprises a liquid crystal unit assembly which includes a liquid crystal panel, an incident side polarizing plate and an emitting side polarizing plate which are arranged on an incident side and on an emitting side of the liquid crystal panel, respectively, and a color combining prism. The apparatus further comprises a fan; a duct which is connected to the fan and which is provided with an opening for supplying cooling air, wherein the opening is arranged near the liquid crystal panel and the incident side polarizing plate; a holder for holding the emitting side polarizing plate and the color combining prism; and a heat exchanger which is connected to the holder, wherein the heat exchanger uses liquid coolant.