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175 results about "Mechanical impedance" patented technology
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Mechanical impedance is a measure of how much a structure resists motion when subjected to a harmonic force. It relates forces with velocities acting on a mechanical system. The mechanical impedance of a point on a structure is the ratio of the force applied at a point to the resulting velocity at that point. Mechanical impedance is the inverse of mechanical admittance or mobility. The mechanical impedance is a function of the frequency ω of the applied force and can vary greatly over frequency.
High sensitivity noise immune stethoscope
ActiveUS20070165872A1Efficient couplingHigh elastic modulusTransducer detailsStethoscopeEngineeringActive systems
A physiological sensing stethoscope suitable for use in high-noise environments is disclosed. The stethoscope is designed to be substantially matched to the mechanical impedance of monitored physiological activity and substantially mismatched to the mechanical impedance of air-coupled acoustic activity. One embodiment of the stethoscope utilizes a passive acoustic system. Another embodiment utilizes an active Doppler system. The passive and active systems can be combined in one stethoscope enabling switching from a passive mode to an active mode suitable for use in very high-noise environments. The stethoscope is suitable for use in environments having an ambient background noise of 100 dBA and higher. The passive includes a head having a housing, a flexural disc mounted with the housing, and an electromechanical stack positioned between the housing and the flexural disc in contact with the skin of a patient. The active system detects Doppler shifts using a high-frequency transmitter and receiver.
Owner:ACTIVE SIGNAL TECH
Device and method for controlling robot arm, robot and program
ActiveUS20090105880A1Control be possibleProgramme-controlled manipulatorComputer controlEngineeringControl theory
In a robot arm controlling device, a mechanical impedance set value of the arm is set by an object property-concordant impedance setting device based on information of an object property database in which information associated with properties of an object being gripped by the arm is recorded, and a mechanical impedance value of the arm is controlled to the set mechanical impedance set value by an impedance controlling device.
Owner:PANASONIC CORP
Apparatus and method for controlling robot arm, and robot and program
ActiveUS20100087955A1Improve rigidityLimit its operationProgramme-controlled manipulatorComputer controlControl theoryData library
A control device for a robot arm is designed such that, based on information on a transportation state database in which information on a transportation state of a person operating the arm is recorded, an impedance setting unit sets a mechanical impedance set value of the arm, and an impedance control unit controls a mechanical impedance value of the arm to the mechanical impedance set value thus set.
Owner:PANASONIC CORP
Variable mechanical-impedance artificial legs
InactiveUS8551184B1Minimize power consumptionIncrease the number ofNon-surgical orthopedic devicesArtificial legsOn boardEngineering
In one aspect, the invention provides methods and apparatus facilitating an adjustable-stiffness prosthesis or orthosis (including approximations to arbitrarily definable non-linear spring functions). Spring rates may be varied under no-load conditions during a walking gate cycle to minimize power consumption. In another aspect, the invention provides methods and apparatus for outputting positive power from a prosthesis or orthosis, facilitating high-performance artificial limbs. In one embodiment of the invention, the positive power is transferred from a functioning muscle to the prosthesis or orthosis, which mimics or assists a non-functioning or impaired muscle. In another embodiment of the invention, the positive power comes from an on-board power source in the prosthesis or orthosis.
Owner:OTTO BOCK HEALTHCARE IP GMBH & CO KG
Impedance-matched vibration massager
A hand-held massager capable of self-excited, impedance-matched vibration for optimal massaging of each particular body part of each particular individual. The massager includes a hollow, open-ended contact piece to which is coupled a vibrator and which is to be held against a desired body part. A pressure sensor is mounted to the contact piece for sensing pressure variations in the cavity in the contact piece while the open end thereof is held against the body part, in order to ascertain the mechanical impedance of that body part. A closed-loop, electropneumatic vibration control system makes it possible for the mechanical impedance to be fed back to the vibrator, causing the latter to make self-induced vibration. Thus the desired body part is optimally massaged at its resonance frequency.
Owner:M I LABIRIES
Device and method for controlling robot arm, robot and program based on object-dependent impedance
ActiveUS7558647B2Sampled-variable control systemsProgramme-controlled manipulatorEngineeringControl theory
Owner:PANASONIC CORP
Method and system for external assessment of hearing aids that include implanted actuators
InactiveUS6879693B2Simple wayIntuitive evaluationElectrotherapyPiezoelectric/electrostriction/magnetostriction machinesElectrical resistance and conductanceTransducer
A noninvasive method and system are provided for assessing the performance of implanted actuators of semi or fully-implantable hearing aid systems. The invention utilizes an externally positioned test measurement device to obtain measurements of the electrical impedance of an implanted actuator when driven by a test signal of predetermined characteristics. In one embodiment, the test measurement device may comprise a signal generator for generating the test signal for the actuator, a signal processing unit to compute the electrical impedance from voltage and current measurements, and a user interface to provide an output that is usable to asses the performance of the actuator. The electrical impedance is computable from the voltage and current of the signal passing through the actuator. The electrical impedance is directly related to the mechanical impedance present at the interface between the actuator and middle ear of a patient. As such, by driving the actuator at one or more predetermined frequencies the resultant voltage and current measurements may be utilized to assess whether the implanted transducer is operative and whether a desired interface between the transducer and the middle ear of patient (e.g. the ossicular chain) is present.
Owner:COCHLEAR LIMITED
High sensitivity noise immune stethoscope
ActiveUS8265291B2Improvement factorEnhanced couplingTransducer detailsStethoscopeAir coupledEngineering
Owner:ACTIVE SIGNAL TECH
Low frequency electro-mechanical impedance tuner
InactiveUS7646267B1Small sizeEasy to manufactureMultiple-port networksResistance/reactance/impedenceEngineeringElectric cables
A segmented, electro-mechanical, remotely controlled programmable impedance tuner for the frequency range between 10 and 200 MHz uses a cascade of three continuously variable mechanical capacitors interconnected by a set of two low loss flexible or semi-rigid cables; the electrical length of the interconnecting cables between the capacitors determines the frequency at which tuning coverage of the entire area of the Smith chart is optimum; for maximum impedance coverage the length is to be chosen such as to generate a transmission phase shift of 60 degrees at the center frequency between each capacitor stage. Remote tuning is possible by changing the value of the capacitors using electrical stepper motors. The tuner is calibrated using a vector network analyzer and the data are saved in the memory of the control computer, which then allows tuning to any user defined impedance within the tuning range. Reflection factor values between 0 and higher than 0.9 can be obtained using this tuner.
Owner:TSIRONIS CHRISTOS
Welding gun and methods conducted using the same
InactiveUS6313427B1Decreased in size and rigidityEliminate gapsResistance electrode holdersArc welding apparatusEngineeringWeld strength
Owner:TOYOTA JIDOSHA KK
Augmented RIC model of respiratory systems
The present invention generally relates to an apparatus and method analyzing the respiratory characteristics of a human respiratory system from impulse oscillometry data, through the use of a linear network of electrical components. The present invention offers an improved alternative to the RIC respiratory circuit model, with an addition of a peripheral resistance to account for the resistance presented by the respiratory system's small airways and of a capacitor to account for extrathoracic compliance. After air pressure and air flow measurements are obtained from the subject by performing Impulse Oscillometry System testing, a graphical representation of a mechanical impedance characteristic may be derived. This allows for the estimation and adjustment of parameter values of the linear network whose components correlate to the resistances, compliances and inertances inherent in the respiratory system. Additionally, the linear network of electrical components may be configured as a virtual network represented in graphical form wherein the parameter values are estimated and adjusted according to program instructions operating on a computer system. The linear network of electrical components serves to provide parametric means for detection, diagnosis and treatment of various pathologies in the human respiratory system.
Owner:TEXAS CHRISTIAN UNIVERSITY
Structural Health Monitoring Apparatus and Methodology
ActiveUS20100042338A1Plug gaugesAnalysing solids using sonic/ultrasonic/infrasonic wavesStructural health monitoringPhased array
Disclosed is an apparatus and methodology for structural health monitoring (SHM) in which smart devices interrogate structural components to predict failure, expedite needed repairs, and thus increase the useful life of those components. Piezoelectric wafer active sensors (PWAS) are applied to or integrated with structural components and various data collected there from provide the ability to detect and locate cracking, corrosion, and disbanding through use of pitch-catch, pulse-echo, electro / mechanical impedance, and phased array technology. Stand alone hardware and an associated software program are provided that allow selection of multiple types of SHM investigations as well as multiple types of data analysis to perform a wholesome investigation of a structure.
Owner:UNIVERSITY OF SOUTH CAROLINA
Apparatus and method for controlling robot arm, and robot and program
ActiveUS7747351B2Improve rigidityProgramme-controlled manipulatorComputer controlControl theoryImpedance control
Owner:PANASONIC CORP
Acoustic device and method of making acoustic device
ActiveUS7916878B2Improve performanceEnhanced radiationSound producing devicesPlane diaphragmsEngineeringOperating frequency
Owner:TECTONIC AUDIO LABS INC
Loudspeakers
InactiveUS6839444B2Improving off-axis powerIncreased bending stiffnessPlane diaphragmsTransducer casings/cabinets/supportsTransducerEngineering
A loudspeaker comprising a panel-form acoustic member adapted for operation as a bending wave radiator and an electrodynamic moving coil transducer having a voice coil mounted to the acoustic member to excite bending wave vibration in the acoustic member. The junction between the voice coil and the acoustic member is of sufficient length in relation to the size of the acoustic member to represent a line drive such that the acoustic member has a mechanical impedance which has a rising trend with bending wave frequency.
Owner:NEW TRANSDUCERS LTD
Servo-controlled pneumatic pressure oscillator for respiratory impedance measurements and high-frequency ventilation
Owner:TRUSTEES OF BOSTON UNIV
Structural health monitoring apparatus and methodology
ActiveUS7881881B2Material analysis using sonic/ultrasonic/infrasonic wavesSpecial data processing applicationsStructural health monitoringPhased array
Owner:UNIVERSITY OF SOUTH CAROLINA
Mechanical implement utilizing active material actuation
ActiveUS20110071670A1Avoid damageHigh impedanceProgramme-controlled manipulatorSpecial data processing applicationsEngineeringShape-memory polymer
A mechanical implement adapted for use in an autonomously functioning device, such as a robot arm, and including an active material, such as shape memory polymer, element that when activated and / or deactivated is operable to modify the mechanical impedance of a joint or link in the device.
Owner:GM GLOBAL TECH OPERATIONS LLC
Multilayer interlayer having sound damping properties over a broad temperature range
ActiveUS20160111077A1Improve sound insulationWallsSynthetic resin layered productsSoft layerPlasticizer
A polymer interlayer having improved sound insulation is disclosed. The polymer interlayer comprises at least one soft layer wherein the soft layer comprises: a first poly(vinyl butyral) resin having a first residual hydroxyl content and a first glass transition temperature (Tg); a second poly(vinyl butyral) resin having a second residual hydroxyl content and a second glass transition temperature (Tg), wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 1.0 weight percent; wherein the difference between the first glass transition temperature (Tg) the second glass transition temperature (Tg) is at least 1.5° C.; and a plasticizer; at least one stiffer layer comprising a third poly(vinyl butyral resin) having a third residual hydroxyl content; and a plasticizer, wherein the polymer interlayer has a damping loss factor (q) (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.16 measured at two or more different temperatures selected from 10° C., 20° C. and 30° C.
Owner:SOLUTIA INC
Apparatus and method for controlling robot arm, and robot and program
ActiveCN101646534ASafe and reliable controlImprove rigidityProgramme controlProgramme-controlled manipulatorSimulationTransfer status
Provided is a robot arm control apparatus. In the apparatus, an impedance setting section (23) sets a mechanical impedance setting value of an arm, based on information obtained from a transfer statusdatabase (21) wherein information relating to transfer status of a person operating the arm is recorded, and an impedance control section (24) controls the mechanical impedance value of the arm to the set mechanical impedance setting value.
Owner:PANASONIC CORP
Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates
InactiveCN103700366ASatisfy medium and high frequencyFulfil requirementsSound producing devicesEnvironmental noiseHelmholtz resonator
The invention relates to a wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates, and belongs to the technical field of environmental noise control. The wideband sound absorption structure comprises one or more layers of micropunch plates in the front of the structure and a mechanical impedance plate at the rear part of the structure, wherein the micropunch plates and the mechanical impedance plate are all fixed on a bracket; the mechanical impedance plate is formed by an elastically supported thin plate; Helmholtz resonance cavities are compositely arranged on the mechanical impedance plate; each Helmholtz resonance cavity consists of a cavity body and an insertion tube. According to the wideband sound absorption structure, Helmholtz resonance units are designed on the mechanical impedance plate, and the thicknesses of the resonance cavities are smaller, thus the whole structural thickness does not change too much. The micropunch plates can have good sound absorption effect for middle-frequency and high-frequency noises, and a plurality of absorption peaks can be generated at low frequency through a mechanical impedance unit and the Helmholtz resonance units, so that the whole structure can ensure good middle-frequency and high-frequency sound absorption performance and also has good sound absorption effect at low frequency.
Owner:JIANGSU UNIV
Welding gun and methods conducted using the same
InactiveUS20010045413A1Decreased in size and rigidityResistance electrode holdersWelding/cutting auxillary devicesEngineeringWeld strength
Owner:TOYOTA JIDOSHA KK
Apparatus for generating an enhanced vibrational stimulus using a rotating mass motor
ActiveUS9474683B1Low costMaximize actuator displacementDiagnosticsVibration massageElectricityTransducer
A low cost eccentric mass motor vibrotactile transducer provides a point-like vibrational stimulus to the body of a user in response to an electrical input. Preferably the eccentric mass and motor form part of the transducer actuator moving mass. The actuator moving mass is constrained into vertical motion by a spring between the actuator housing and moving mass. The actuator moving mass is in contact with a skin (body) load. The actuator housing is in simultaneous contact with the body load. The mass of the motor / contactor assembly, mass and area of the housing, and the compliance of the spring are chosen so that the electromechanical resonance of the motional masses, when loaded by the typical mechanical impedance of the skin (body), are in a frequency band where the human body is most sensitive to vibrational stimuli 150-300 Hz.
Owner:MORTIMER BRUCE J P +2
Acoustic Device And Method Of Making Acoustic Device
ActiveUS20070278033A1Prevent leakageImprove performanceSound producing devicesPlane diaphragmsEngineeringOperating frequency
An acoustic device comprising a diaphragm (10) having an area and having an operating frequency range and the diaphragm (10) being such that it has resonant modes in the operating frequency range, an electromechanical transducer having a drive part coupled to the diaphragm (10) and adapted to exchange energy with the diaphragm, and at least one mechanical impedance means (20,22,24) coupled to or integral with the diaphragm, the positioning and mass of the drive part (26) of the transducer and of the at least one mechanical impedance means (20,22,24) being such that the net transverse modal velocity over the area of the diaphragm (10) tends to zero. A method of making an acoustic device having a diaphragm having an area and having an operating frequency range which includes the piston-to-modal transition, comprising choosing the diaphragm parameters such that it has resonant modes in the operating frequency range, coupling a drive part of an electro-mechanical transducer to the diaphragm to exchange energy with the diaphragm, adding at least one mechanical impedance means to the diaphragm, and selecting the positioning and mass of the drive part of the transducer and the positioning and parameters of the at least one mechanical impedance means so that the net transverse modal velocity over the area tends to zero.
Owner:TECTONIC AUDIO LABS INC
Compact multi frequency-range impedance tuner
An automatic multi frequency-range electro-mechanical impedance tuner covers frequencies from a low megahertz to a high gigahertz range, by combining a high frequency with one or two a low frequency tuner modules; the low frequency module is made using either variable phase shifter-capacitor or multi-capacitor-transmission line tuner structures. The high frequency module is a single, double or triple probe slide screw tuner covering up to 1.5 decades in frequency; the low frequency tuner is using cascades of three or more capacitor-coax cable tuning sections or a low frequency phase shifter combined with a variable shunt capacitor; the low frequency tuner can operate as low as a few megahertz whereas the high frequency tuner can operate up to several gigahertz. Depending on the application, low frequency parallel-blade capacitors or high frequency coaxial trimmers are used. Typical cross-over frequencies between low and high frequency modules range from 200 to 800 megahertz, lowest frequencies can reach below 10 megahertz and highest frequencies 26 to 40 gigahertz. Appropriate calibration, control and tuning procedures allow for a fully integrated operation.
Owner:TSIRONIS CHRISTOS
Thin broadband sound-absorbing structure of composite multi-layer mechanical impedance plates
InactiveCN102968985AIncreasing the thicknessSound absorption frequency bandwidthSound producing devicesWater-setting substance layered productAdhesiveCavity resonance
The invention provides a thin broadband sound-absorbing structure. The structure comprises a sound-absorbing material, a support and at least two layers of mechanical impedance plates, wherein the sound-absorbing material is installed on the inner side of one end of the support, a supporting plate is arranged on the inner wall of the other end of the support, each of the mechanical impedance plates consists of a back plate and sticky elastic rings at two ends of the back plate, adjacent back plates are not in contact, sticky elastic rings are stuck to the supporting plate through an adhesive, the sticky elastic rings, the support inner wall and the back plates are attached tightly, a hollow is formed among the sound-absorbing material and the mechanical impedance plates, and the back plate on the outermost side is recessed towards the support end face by certain distance. Mechanical impedance is coupled to a traditional sound-absorbing material and a cavity resonance absorption mechanism, a novel thin broadband sound-absorbing mechanism is formed, the structure thickness is not increased basically based on the acoustic performance, the middle / high-frequency sound absorption performance is good, the low-frequency sound absorption effect is improved greatly and the sound-absorbing structure of which the thickness is thin and the sound-absorbing frequency band is wide is produced.
Owner:JIANGSU UNIV
Apparatus for generating a vibrational stimulus using a rotating mass motor
ActiveUS8398569B1Low costMaximize displacementDiagnosticsChiropractic devicesElectromechanical resonanceTactile sensor
The present invention provides a novel implementation of a low cost eccentric mass motor vibrotactile transducer providing a point-like vibrational stimulus to the body of a user in response to an electrical input. Preferably the eccentric mass and motor form part of the transducer actuator moving mass. The actuator moving mass is constrained into vertical motion by a spring between the actuator housing and moving mass. The actuator moving mass is in contact with a skin (body) load. The actuator housing is in simultaneous contact with the body load. The body load, actuator moving mass, spring compliance and housing mass make up a moving mass resonant system. The spring compliance and system component masses can be chosen to maximize the actuator displacement and / or tailor the transducer response to a desired level. The mass of the motor / contactor assembly, mass and area of the housing, and the compliance of the spring are chosen so that the electromechanical resonance of the motional masses, when loaded by the typical mechanical impedance of the skin, are in a frequency band where the human body is most sensitive to vibrational stimuli 150-300 Hz. This configuration can be implemented as a low mass wearable vibrotactile transducer or as a transducer that is mounted within a soft material such as a seat. A particular advantage of this configuration is that the moving mass motion can be made almost independent of force loading on the transducer housing.
Owner:ENG ACOUSTICS
Golf ball with soft core
Disclosed herein is a golf ball with a solid core having a PGA compression of 55 or less and an outer cover layer having a Shore D hardness of at least 60, the ball having a PGA compression of 80 or less. In another embodiment of the invention, the ball has a mechanical impedance with a primary minimum value in a frequency range of 3100 Hz or less after the ball has been maintained at 21.1° C., 1 atm. and about 50% relative humidity for at least 15 hours. A further embodiment of the invention is a golf ball having a core, and a cover with a Shore D hardness of at least 58, the ball having a mechanical impedance with a primary minimum value in the frequency range of 2600 Hz after the ball has been maintained at 21.1° C., 1 atm. and about 50% relative humidity for at least 15 hours. The balls of the invention have good distance while providing a soft sound and feel.
Owner:CALLAWAY GOLF CO
Steering apparatus for vehicle
InactiveUS7520365B2Reduce loadPrecise angle controlSteering initiationsDigital data processing detailsSteering wheelDriver/operator
Owner:MAZDA MOTOR CORP
Wide band sound absorption structure of film mechanical impedance combined with micropunched plate acoustic impedance
The invention discloses a wide band sound absorption structure of film mechanical impedance combined with micropunched plate acoustic impedance, which comprises an upper support and a lower support which are fixedly and perpendicularly connected with a wall. A front micropunched plate and a rear micropunched plate are fixedly and perpendicularly connected between the two supports. A rectangular cavity is formed respectively between the front micropunched plate and the rear micropunched plate and between the rear micropunched plate and the wall. In the rectangular cavity formed by the rear micropunched plate and the wall, the inner side faces of the two supports are respectively and fixedly connected with a groove structure with the front face of a groove mouth facing the rear micropunchedplate in a vertically symmetrical mode. An elastic ring is closely bonded in the groove mouth of the groove structure in an adhesive mode and bonded with a composite film in an adhesive mode, and thecomposite film is formed by evenly pasting an elastic film and a sound insulation film. A mechanical impedance unit formed by films is added in a rear cavity. The micropunched plate is combined with mechanical impedance of films, the micropunched plate structure is utilized to absorb sound energy at middle and high band, and mechanical impedance of films is utilized to absorb sound energy for lowfrequency. The broadband sound absorption structure has the advantage that sound absorption frequency band is wide.
Owner:JIANGSU UNIV
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