409 results about "Fan noise" patented technology

An engine nacelle inlet lip includes both acoustic treatment and electric heating for ice protection. The inlet lip has a composite outer skin and a composite inner skin, with the composite outer skin having at least one integrated heater element embedded in the composite material. An acoustic cellular core positioned between the outer and inner skin acts to attenuate fan noise from the engine. Covering the outer skin and overlying the acoustic core is a perforated erosion shield having a first set of openings that pass entirely thorough its thickness. The composite outer skin includes a second set of openings such that sound waves can pass from an inner barrel portion of the inlet lip through the erosion shield, outer skin, and heater element to the underlying acoustic cellular core.

A temperature control system for an electronics system minimizes fan noise as much as possible. The system, which may be a computer, is capable of implementing a plurality of temperature control protocols. Each protocol generally specifies fan speed as a function of temperature. When the system initializes, a protocol is selected that, on average, is quieter than at least one other protocol, and preferably all other protocols. The system monitors its own temperature and, if the temperature reaches a threshold, the system causes the initial temperature control protocol to be changed to a different protocol that is better able to cool the system, albeit with a resulting louder sound level.

To provide a reliable high brightness and definition image display by inhibiting a possible increase in fan noise and promoting cooling of an upper, hot portion of a display panel module, various boards, and image processing electronic components, an image display includes a flat display panel module, a display surface side cover on a display surface side of the display panel module, a non display surface side cover on a non display surface side of the display panel module, a display driving board, a power supply board, and a cooling fan, wherein a case of the cooling fan is larger than a distance between the display panel module and the non display surface side cover in an area where the cooling fan is installed, and a first end of the case of the cooling fan closer to the non display surface-side cover is positioned above a second end of the case closer to the display panel module.

A multi-fan apparatus and method incorporates mutual active cancellation of fan noise and / or vibrations. The multi-fan apparatus includes two or more fans circuits, each comprising a fan, a fan speed controller and a separate tachometer, and a fan phase controller. The phase controller is connected to at least one fan speed controller and to each tachometer. Each fan's speed is independently and dynamically maintained at the same set speed by the fan speed controllers using an independent control loops. A noise and / or vibration cancellation phase difference between fans is determined in order to achieve destructive interference of pressure waves and, thus, noise and / or vibration reduction, in pre-determined region of a system incorporating the multi-fan apparatus. The phase controller establishes and maintains this cancellation phase difference between the fans based upon feedback from the tachometers.

An electronic equipment is provided, which comprises a liquid-cooling system and a cooling fan as a cooling system, efficiently cools the liquid-cooling system, and reduces fan noise. The electronic equipment is provided with a liquid-cooling system, in which heat generated in a heat generating portion is transmitted to a heat radiating portion with a liquid as a medium to achieve cooling, and an air-cooling system, in which heat transmitted to the heat radiating portion is forcedly cooled, and comprises a pump that circulates the liquid between the heat generating portion and the heat radiating portion, a fan that forcedly discharges heat of the heat radiating portion to an outside, a temperature sensor that detects temperature of the heat generating portion, and storage information that beforehand prescribes the relationship between temperature of the heat generating portion and voltages of the pump and the fan, the electronic equipment being constructed such that a pump voltage is raised without changing a fan voltage when the detected temperature exceeds a first temperature, and a fan voltage is raised when temperature detected by the temperature sensor exceeds a second temperature higher than the first temperature, thus further increasing a cooling capacity.

A temperature control system for an electronics system minimizes fan noise as much as possible. The system, which may be a computer, is capable of implementing a plurality of temperature control protocols. Each protocol generally specifies fan speed as a function of temperature. When the system initializes, a protocol is selected that, on average, is quieter than at least one other protocol, and preferably all other protocols. The system monitors its own temperature and, if the temperature reaches a threshold, the system causes the initial temperature control protocol to be changed to a different protocol that is better able to cool the system, albeit with a resulting louder sound level.

A noise suppression system for an air-cooled internal combustion engine is disclosed. The system may include an acoustically designed shroud forming a cavity and configured for attenuating noise produced by a cooling air fan associated with the engine. In one system, the shroud is mountable on a housing of the air fan. A pair of air inlet passages may be provided which are operable to draw ambient cooling air into the shroud to the fan. The air inlet passages are acoustically configured and tuned to attenuate noise generated by the fan. In one system, the air inlet passages may each be formed in a rear quadrant of the shroud. Various configurations of the shroud may include quarter wave resonators and / or micro-perforated panels to further attenuate fan noise.

Systems and methods for improving the signal to noise ratio for audio input in a computing system are provided. Signal to noise ratio improvements are enabled for an input audio signal by incorporating a plurality of microphones into the PC environment, for example, to improve the processing of voice or speech input or other audio capture applications. In various embodiments, a plurality of microphones are spaced apart, e.g., attached to or within a PC housing, in such a way that noise from PC components can be “subtracted” or reduced from an input audio signal, which increases the signal to noise ratio and improves audio processing accuracy. The “subtraction” or reduction techniques applied by the present invention are unique to the PC environment wherein different noises having particular characteristics can be identified, including, but not limited to, rattle of device components, fan noise and disk noise.

The present invention is a liquid crystal projector device using a liquid crystal panel. The device mounts a liquid crystal panel (16) on a light incident plane of a polyhedral dichroic prism (23) in a bonded state so as to integrate the panel with the prism, and comprises a heat sink (29) and a heat pipe (31) which forcedly cools the integrated structure statically. The liquid crystal projector device comprising the structure describe above cools the liquid crystal panel efficiently without bringing any trouble caused by fan noise or raise of dust.

A wind power installation is provided having a pylon, a pod mounted rotatably on the pylon, a generator arranged within the pod and having a rotor and a stator, and at least one fan in the region of the pod. In order to reduce the entry of moisture, sand and other foreign substances into the pod and also to reduce the fan noise which reaches the exterior, the fan may suck in outside air through a downwardly open first air gap, in particular between the pylon and the pod. The fan may be adapted to blow air out of a rear part of the pod, through an air gap between the stator and the rotor and into a front part of the pod. A seal structure may be positioned in the pod in such a way that an air flow that bypasses the air gap between the stator and the rotor is substantially prevented.

A fan system includes a rotor supported for rotation about a fan axis. The rotor has a central hub and a plurality of blades each extending outwardly from the hub to a tip. The rotor blades define a rotor plane perpendicular to the fan axis. A first acoustic resonator has an opening disposed on a first side of the rotor plane and a second acoustic resonator has an opening disposed on a second side of the rotor plane. The acoustic resonators are configured to provide a dipole resonator system operable to at least partially reduce a blade pass frequency tone in an upstream and a downstream direction simultaneously.

The invention relates to a heat radiating device of flat water tank for computers and electrical apparatus, comprising the flat water tank, an impeller window component, a soft pipe, a water cooling head and a power supply module, wherein the impeller window component has three functions for observing the dynamic state of the impeller window component, observing the water level of cooling liquid and being used as a water injection port of the flat water tank; the flat water tank has two functions of being used as a tank shell and radiating; and the tank body is formed by bonding, sealing and welding a flat plate and a corrugated plate, wherein antifreezing cooling liquid can be contained in the convex space of the corrugated plate; after the convex space, the soft pipe, the water cooling head and the impeller window component are closed and assembled, a closed water circulation device is formed; and automatic circulation is realized by the characters of expansion and raise by heat and shrinkage and reduction by cold, without using a water pump as power. The heat of a computer CPU and the power supply module is brought to the flat water tank by water circulation; and the flat water tank is used for naturally cooling air and radiating the heat, thereby achieving the purpose for quietly cooling in an energy saving mode. The flat water tank is combined with the power supply module for saving a power fan of a desktop computer. The flat water tank can be also used for electrical equipment needing cooling and not needing fan noise and radiators used as refrigerating equipment, such as water machines, refrigerators and the like which have certain requirements on appearance.