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Class 700/280 - Vibration or acoustic noise control


Subclass of Class 700 - Data processing: generic control systems or specific applications
Definition: Subject matter comprising means for canceling undesired
No. of patents: 217
Last issue date: 12/06/2011


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NumberTitleIssue Date
8073571Method and device for frequency-response correction in vibration isolation systems
To achieve improved frequency-response correction of a vibration-signal transmitter in a vibration isolation system, the invention proposes a method in which an analog sensor signal representing vibrations is generated through the use of a vibration-signal transmitt...
12/06/2011
8014903Method for suppressing vibration and device therefor
The vibration suppressing device includes vibration sensors, a FFT calculating unit, a store device, a calculating unit, and a NC device. The vibration sensors detect a time-domain vibrational acceleration of a rotary shaft during rotating. The FFT calculating unit ...
09/06/2011
8005574Vibration suppressing method and device
A stable rotation speed is acquired by finely changing a rotation speed of a rotary shaft 3 based on an expected stable rotation speed, and calculating an amount of change of a k′ number, and the like. Therefore, a more accurate rotation speed can be acquir...
08/23/2011
8000839Method and apparatus for actively canceling vibrations in a computer system
One embodiment of the present invention provides a system actively cancels vibrations in a computer system. During operation, the system monitors vibrations in the computer system. Next, the system analyzes the vibrations to identify one or more harmonics in the vib...
08/16/2011
7945350Wind turbine acoustic emission control system and method
A system and method for controlling noise generated from a wind turbine is disclosed. The method includes selectively adjusting the angle of pitch of the blade in response to an amount of noise generated being above a predetermined amount and maintaining the amount ...
05/17/2011
7917248Dynamic marking system
A method for configuring a marking device includes, at a control system, establishing communication with the marking device; receiving, from the marking device, information about capabilities of the marking device; presenting the received information about capabilit...
03/29/2011
7908033Built-in swept-sine testing for a computer system to assure vibrational integrity
Embodiments of the present invention provide a system that performs vibration testing in a computer system. The system starts by generating a vibration at a predetermined frequency in a computer system. The system then determines if the computer system has a resonan...
03/15/2011
7904210Vibration control system
A vibration control system and a method for controlling vibration in a material surface are disclosed, wherein the vibration control system provides a desired motion of the material surface while militating against any undesirable motion of the surface. The vibratio...
03/08/2011
7877167Reducing vibration in an electronic system
In a method for reducing vibration in an electronic system, at least one component of interest that is subject to vibration is identified, at least one component that is a source of the vibration is identified, a resonant frequency of the at least one component of i...
01/25/2011
7822509Control system for active vibration isolation of a supported payload
The invention relates to a control system for active vibration isolation of a supported payload with a control device that comprises a processing unit (41) for processing position data and orientation data of all available sensors to supply a sensor control m...
10/26/2010
7747353Method of setting control data in an active vibration isolation control system and a control method thereof
A method of setting control data by an active vibration isolation control system includes the steps of selecting, when a frequency of a pulse signal actually detected is superior to a predetermined frequency, appropriate control data selected from among predetermine...
06/29/2010
7715949Vibration reducing device
A vibration reducing device that reduces the vibration of a control object includes a digital controller. A vibration state detection device detects the vibration of the control object and generates an analog signal of the vibration of the control object. An input-s...
05/11/2010
7715948Method and apparatus for regulating vibration isolation systems
The invention relates to the control and regulation of a vibration isolation system with a number of vibration signal transducers for providing analogue sensor signals and a number of actuators for suppressing vibrations by processing the sensor signals to form actu...
05/11/2010
7711452Characterizing vibrational health in computer systems with variable component configurations
One embodiment of the present invention provides a system that efficiently conducts vibrational characterizations for a computer system having variable component configurations. During operation, the system receives a given component configuration associated with th...
05/04/2010
7706924Vibration controller for active vibration insulators and method for controlling vibrations for the same
A vibration controller includes a map controller, an adaptive controller, a set-up frequency judge/switcher, and an actuator. The map controller includes a data map storage for storing data on control signals determined in advance for a vibration insulator, and a si...
04/27/2010
7596428Methods and apparatuses for monitoring steam turbine valve assemblies
The present application provides for apparatuses and methods for monitoring steam turbine valve assemblies. In one embodiment of the present application a method for monitoring valve assemblies is provided. First, the vibration characteristics of at least one valve ...
09/29/2009
7567857Control device and method for a vibratory machine
This invention relates to a control unit for an unbalanced mass adjusting device in a vibration generator, in particular in a soil compaction machine, having an adjusting cylinder which is hydraulically adjustable to adjust a relative position of contrarotating unba...
07/28/2009
7565226Determining operating fan speed for systems containing disk drives to minimize vibrational impact
A method and an apparatus for determining cooling fan speeds that should be avoided to prevent vibational resonance with system enclosures, given ambient conditions, and/or current geographic altitude. An exemplary method to determine one or more ranges of fan speed...
07/21/2009
7532951Method of automatically setting vibration suppression filter
A filter is set by a control apparatus automatically detecting a vibration frequency and determining a filter to be needed, in a simple method that does not require a special process. A servo control apparatus which drives a servo motor includes a vibration d...
05/12/2009
7489987Control of an active vibration isolation system
Control of an active vibration isolation system with a digital controller, which includes an FPGA system (5) as the control unit. The FPGA system (5) is made up of freely programmable gate arrays with a sensor control matrix (51), which calculat...
02/10/2009
7426426System and method for simultaneously controlling spectrum and kurtosis of a random vibration
A system and method for producing and controlling a random signal with simultaneous control of both the power spectral density (PSD) and kurtosis (100) where a controlled signal is measured from a transducer, and converted to a PSD (111) using a Fast F...
09/16/2008
7409268Method for actuating active vibration insulators
A method for actuating active vibration insulators includes the steps of generating an idling control signal in an idling range of a vehicle, generating a running control signal in a running range of the vehicle, and actuating an electromagnetic actuator of an activ...
08/05/2008
7409269Methods of analyzing the vibro-acoustic optimization potential and optimizing the vibro-acoustic behavior of a structure
A method of analyzing the vibro-acoustic optimization potential of a structure of vibro-acoustically coupled subsystems having internal and coupling loss factors by means of statistical energy analysis (SEA). The method optimizes the vibro-acoustic behavior of the s...
08/05/2008
7400943Methods and systems for analyzing engine unbalance conditions
Methods and systems for analyzing engine unbalance conditions are disclosed. In one embodiment, a method includes receiving vibrational data from a plurality of locations distributed over an engine and a surrounding engine support structure, and inputting the vibrat...
07/15/2008
7387017Digital Q control for enhanced measurement capability in cantilever-based instruments
A digital system for controlling the quality factor in a resonant device. The resonant device can be any mechanically driven resonant device, but more particularly can be a device that includes a cantilever within its system, such as an atomic force microscope. The ...
06/17/2008
7381017Detecting and suppressing methods for milling tool chatter
A detecting and suppressing control method for milling tool chatter. Milling parameters are defined. A milling device is initiated using the milling parameters. Milling signals are extracted using a sensor installed on the milling device. It is determined whether ch...
06/03/2008
7370829Method and system for controlling helicopter vibrations
A method/system for controlling helicopter vibrations is provided that includes a vibration canceling force generator for actively generating a vibration canceling force. The system includes a resonant actuator having a natural resonant frequency and a resonant actu...
05/13/2008
7363111Methods and systems for analyzing engine unbalance conditions
Methods and systems for analyzing engine unbalance conditions are disclosed. In one embodiment, a method includes receiving vibrational data from a plurality of locations distributed over an engine and a surrounding engine support structure, and inputting the vibrat...
04/22/2008
7359789Control system for an internal combustion engine and a vehicle having the same
The invention provides a control system for an internal combustion engine of a vehicle. The control system includes a sensor controller and an engine controller. The sensor controller includes a first interface configured to be connected to a sensor coupled to the e...
04/15/2008
7350394Zero-g offset identification of an accelerometer employed in a hard disk drive
A method is provided for identifying offsets of accelerometers integrated into hard disk drives. More specifically, often, disk drives employ accelerometers that constantly monitor the acceleration felt by the disk drive. Once the accelerations are less than a prede...
04/01/2008
7352869Apparatus for and method of actively controlling vibratory noise, and vehicle with active vibratory noise control apparatus
The filter coefficients of an adaptive notch filter are sequentially updated to minimize an error signal based on the error signal and a first reference signal which is produced by subtracting a signal which represents the product of a sine corrective value C1
04/01/2008
7340064Active noise control system
An active noise control system is provided which cancels a noise using a secondary noise from a speaker that is operated in accordance with an output from an adaptive controller. The system is configured such that microphone monitor interrupts a switch to thereby st...
03/04/2008
7340065Active noise control system
An active noise control system is provided which cancels a noise using a sound radiated from a speaker driven by an output from an adaptive notch filter. The system employs output signals from an adder or simulation cosine-wave and sine-wave signals, an error signal...
03/04/2008
7328621Method of processing oscillatory data
A method of processing oscillatory response data from a resonant system includes: obtaining data measuring an oscillatory response of the system at a plurality of evenly spaced time intervals; obtaining a plurality of reference frequencies from the data at a plurali...
02/12/2008
7321809Methods and systems for analyzing engine unbalance conditions
Methods and systems for analyzing engine unbalance conditions are disclosed. In one embodiment, a method includes receiving vibrational data from a plurality of locations distributed over an engine and a surrounding engine support structure, and inputting the vibrat...
01/22/2008
7319954Multi-channel codebook dependent compensation
Methods and apparatus, in the context of speech recognition, for compensating in the cepstral domain for the effect of an interfering signal by using a reference signal. ...
01/15/2008
7317260Wind flow estimation and tracking using tower dynamics
A turbine control system for a variable speed electrical generator in a wind turbine mounted atop a support tower. The wind turbine converts wind energy into a driving torque applied to the generator. The control system includes a turbine support tower position sens...
01/08/2008
7311300Actuator drive control device for active vibration isolation support system, and method of using the same
An actuator of an active engine vibration isolation support system is driven based on the first, second, third . . . duty groups calculated corresponding to the vibration periods t1, t2, t3 . . . of the engine. When the engine rotational speed v...
12/25/2007
7305094System and method for actively damping boom noise in a vibro-acoustic enclosure
A system and method for actively damping boom noise within an enclosure such as an automobile cabin. The system comprises an acoustic wave sensor, a motion sensor, an acoustic wave actuator, a first electronic feedback loop, and a second electronic feedback loop. Th...
12/04/2007
7305297Controller for controlling a plant
The present invention provides a controller for controlling a modeled plant robustly against disturbance. The controller comprises an estimator and a control unit. The estimator estimates disturbance applied to the plant. The control unit determines an input to the ...
12/04/2007
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