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5963884 |
Predictive maintenance system
A predictive maintenance system for a plurality of machines is disclosed. The system includes vibration sensors connected to the machines and a plurality of data acquisition nodes, each node...
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5943634 |
Vibration data analysis based on time waveform parameters
An efficient vibration data collection, analysis, and storage system automates the analysis of time waveform data and optimizes use of available memory and minimizes data collection time by...
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5931441 |
Method of isolating vibration in exposure apparatus
A method is provided for suppressing vibration of a body supported by an anti-vibration mount having a predetermined damping coefficient and a predetermined spring constant. The method includes the...
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5903855 |
Acceleration sensor
An acceleration sensor includes a sensing unit for detecting impact acceleration and a signal processing unit for measuring the magnitude of the detected acceleration. The signal processing unit...
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5897606 |
Shock vibration storing method
In a method for storing vibration waveform data sequentially detected by a vibration sensor. The vibration storing method includes detection of a reference level terminal point (P 3 ) between a...
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5893048 |
Method and apparatus for identifying vibration level of previously tested CD ROM discs
The vibration level of a CD-ROM disc is determined in a computer system by installing the disc onto the disc drive. The disc is spun on the disc drive up to an identification speed. The table of...
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5873559 |
Adaptively tuned vibration absorber for reduction of aircraft cabin noise
An aircraft engine is attached to the fuselage by a mounting structure that has a vibration absorbing system which includes first and second sensors to produce signals indicating vibration along...
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5875420 |
Determining machine operating conditioning based on severity of vibration spectra deviation from an acceptable state
The operational condition of a machine is evaluated when the machine's vibration spectrum deviates from an acceptable state, where an acceptable state is defined by an alarm limit envelope. The...
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5854994 |
Vibration monitor and transmission system
An apparatus is disclosed consisting of one or more machine monitors which attach to one or more machines to sense a physical characteristic of the machine, such as vibration or temperature, and...
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5852793 |
Method and apparatus for predictive diagnosis of moving machine parts
For automatically predicting machine failure a transducer sensor, such as piezoelectric crystal, is applied to a machine for sensing machine motion and structure-borne sound, including vibration...
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5852351 |
Machine monitor
A monitor attaches to a mount proximate a machine to determine the health and operating status of the machine. The monitor is preferably self-contained, having its own internal power source,...
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5847658 |
Vibration monitor and monitoring method
The object of this invention is to produce a monitor which can correctly distinguish normal from abnormal vibration using automatically selected monitoring features and algorithms. The monitor can...
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5845236 |
Hybrid active-passive noise and vibration control system for aircraft
A hybrid active-passive system (20) for reducing noise within a passenger compartment and vibration of a fuselage of a vehicle, such as an aircraft (turboprop, turbofan, or helicopter). The hybrid...
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5841030 |
Process for the determining the vibration characteristics of a body
A process is disclosed for determining the vibration characteristics of a body by modal analysis. The body is made to vibrate at different frequencies and optical interference images of the body...
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5814733 |
Method of characterizing dynamics of a workpiece handling system
A method of characterizing dynamics of a workpiece handling system includes providing a workpiece or substrate (14), supporting the substrate (14) with a workpiece handler (13), providing a motion...
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5812958 |
Anti-vibration system
An anti-vibration system includes an anti-vibration table on which a precise machine, having a driving device and having directions of freedom, is mounted, a plurality of supporting mechanisms for...
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5805457 |
System for analyzing sound quality in automobiles using musical intervals
A computer-implemented system for analyzing sound quality in automobiles includes a noise spectrum generator that generates an actual or synthetic noise spectrum representative of the noise of an...
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5804726 |
Acoustic signature analysis for a noisy enviroment
A device for testing mechanical devices using acoustic signature analysis of the sonic signature of such devices by filtering out the frequencies of interest, recreating such frequencies from their...
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5805464 |
Dynamic balancer electronic angle finder
An apparatus for determining the placement of mass adjustment on a work piece by a centrifugal balancer includes a device incremented by pulses representing angular displacement of the work piece...
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5792948 |
Active vibration control apparatus for vehicle
A vibration control apparatus for a vehicle equipped with a power unit and a vehicle body is comprised of an active engine mount disposed between the power unit and the vehicle body. A controller...
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5784273 |
Method and system for predicting limit cycle oscillations and control method and system utilizing same
A data-driven method and system are provided for predicting limit cycle oscillations such as chatter to obtain a classifier signal which, in turn, may be utilized by a control method and system....
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5777228 |
Method and apparatus for measuring change in state of object to be measured using flexural and torsional vibrations
A method and apparatus for detecting a change in the state of a part of an object to be measured that has a section having a first plate part and a second plate part which has a plate surface...
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5774376 |
Structural health monitoring using active members and neural networks
A system for monitoring the structural integrity of a mechanical structure. The system utilizes a trainable adaptive interpreter such as a neural network to analyze data from the structure to...
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5771177 |
Method and apparatus for measuring dynamic load
A method and apparatus for measuring the mass of a dynamic load without being influenced by vibration caused by the apparatus itself or the environment. A dynamic load sensor that supports the...
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5767406 |
Method to specify random vibration tests for product durability validation
A method for determining the testing profile for accelerated laboratory random vibrational testing of a product, including the steps of (i) selecting the frequency range covered in the laboratory...
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5761087 |
Coordinate input device and a control method therefor
Disclosed is a coordinate input device, having a vibration transmission plate, that simplifies the measurement of a vibration transmission speed, which is used as a known constant to calculate a...
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5758312 |
Apparatus for eliminating noises accompanying the knocking signal of an automobile engine
A knocking control system for an engine comprising a knocking sensor for producing a knocking signal representing the extent of knocking in the engine; reference signal circuitry for producing a...
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5754497 |
Method for locating structure-borne sound events in pressure enclosures to be monitored in power plants
A method for locating structure-borne sound events in pressure enclosures to be monitored in power plants, includes positioning sensors at various locations on a pressure enclosure. Signals are...
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5754432 |
Apparatus and method for estimating chip yield
A high speed device and method for estimating the yield of semiconductor chips without requiring a large data storage area. The noise particles which adhere to a number of semiconductor chips are...
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5748503 |
Apparatus for estimating vehicle speed based on detected wheel speed, without influence of noise included in the detected wheel speed
A vehicle speed detecting apparatus wherein the speeds of vehicle wheels are detected by wheel speed detecting devices, and the vehicle running speed is estimated by a vehicle speed estimating...
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5748491 |
Deconvolution method for the analysis of data resulting from analytical separation processes
An improved signal processing method in a signal processor for performing the deconvolution of a signal resulting from an analytical separation process is disclosed. In a first aspect, a signal...
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5744723 |
Method for determining rotational speed from machine vibration data
A method of determining the rotational speed of a rotating shaft from machine vibration data. The vibration produced by the shaft is sensed to produce a test vibration signal at an unknown...
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5737239 |
Shaking test method and system for a structure
A shaking test system for testing a structure including a shaking device for shaking the structure, measuring devices mounted on the shaking device for shaking the structure, external signal input...
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5734579 |
Rotational-device method and system
A rotational-device test system and method is provided to classify a rotational device according to the type of drive sound thereof. A divider divides the time-series data of an amplitude of the...
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5727900 |
Control of a compacting machine with a measurement of the characteristics of the ground material
A compacting machine having a vibrating drum for compaction of ground material includes a controller. The drum is moved over a segment of the ground while a shear modulus and a plastic parameter of...
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5719338 |
Method and apparatus for providing an indication of compaction in a vibration compaction vehicle
A vibratory compactor includes front and rear frame portions driven by a hydraulic motor and a vibration mechanism on at least one of the frame portions also driven by a hydraulic motor. Speed...
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5712805 |
Noise diagnostic system
A method for reconstructing the acoustic field on the surface of a vibrating object based on measurements of the radiated acoustic pressure includes solving the Helmholtz equation directly using...
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5710714 |
Electronic controller for an adaptively tuned vibration absorber
An apparatus for absorbing vibrations in a structural member has a mass suspended between two mounting plates by a separate springs. The mass has two sections and a mechanism for adjusting the...
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5710715 |
Vibration analysis method
A vibration analysis method for detecting abnormalities by analyzing a vibration waveform. The method includes the steps of, in a plurality of observation time points {t j } composed of a number n...
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5701257 |
Shock measuring method in goods transportation
A shock measuring method for detects shocks during transportation by a sensor and stores such detected shock data. The shock measuring method in goods transportation being characterized in that...
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5698788 |
Method for analysing regularly recurring mechanical vibrations
A method for analysing regularly recurring mechanical vibrations comprises the steps of plotting an amplitude/time spectrum associated with the vibrations, dividing the amplitude/time spectrum into...
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5684718 |
Method and apparatus for monitoring the operation of an electric generator
A method and apparatus are provided for monitoring the operating conditions of an electric generator by producing a signal representative of vibration amplitude in end turns of stator windings of...
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5679900 |
Envelope enhancement system for detecting paper machine press section anomalous vibration measurements
A vibration detecting and condition monitoring system for the press section, including felts, rollers and presses, employing a feature extracting circuit having a selectable plurality of Bessel...
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5675505 |
Sine on random data analysis method for simulating engine vibration
A computer-implemented apparatus and method for operating vibrational testing equipment which conducts vibrational testing upon automobile components. Raw engine acceleration data is gathered from...
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5663894 |
System and method for machining process characterization using mechanical signature analysis
A system and method for characterizing a machining process using techniques of mechanical signature analysis produces discriminants based on vibrational activity, measured at various positions on a...
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5661659 |
Instrumentation power supply and read unit for testing gearboxes through various speeds and gears
An electronic board for cooperation with a computer and a group of noise measuring instruments, for displaying side by side noise curves for various gear pairs of a gearbox for differing...
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5652710 |
Solid/liquid determination apparatus
A turntable having a food of solid or liquid put in a container is rotated during a predetermined time period and then the rotation of the turntable is suspended. After the turntable is suspended,...
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5652386 |
Method and apparatus for predicting sturctural integrity by estimating modal damping factor
The integrity of structures may be determined by either one of two methods. In a first method, an impulse of energy is introduced into the structure, such as by striking the structure, and the...
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5650943 |
Apparatus and method for testing for valve leaks by differential signature method
A portable computing device is used for acoustic testing of valve systems for valve leaks. Transducers are applied to appropriate locations in the valve system to obtain sound signals, which are...
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5647579 |
Control type vibro-isolating support
A control type vibro-isolating support includes a pulse signal generator for generating reference signals x, which represent the state of the vibration being generated by an engine. An acceleration...
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