173results about How to "Eliminate Oscillation" patented technology

A system including methods and apparatus for treatment of a medical disorder such as obstructive sleep apnea or congestive heart failure. The system involves applying separate and independent gains to flow rates of pressurized gas delivered to a patient during inspiratory and expiratory phases of a respiratory cycle to deliver the pressurized gas in proportion to the respective gains during inspiration and expiration. A base pressure may be applied in addition to the gain-modified pressures and an elevated pressure profile may be employed to assist or control inspiration. The system may be fully automated responsive to feedback provided by a flow sensor that determines the estimated patient flow rate. A leak computer can be included to instantaneously calculate gas leakage from the system. The system may be utilized in connection with conventional continuous positive airway pressure (bi-level PAP) equipment to effect various beneficial treatment applications.

A system including methods and apparatus for treatment of a medical disorder such as obstructive sleep apnea or congestive heart failure. The system involves applying separate and independent gains to flow rates of pressurized gas delivered to a patient during inspiratory and expiratory phases of a respiratory cycle to deliver the pressurized gas in proportion to the respective gains during inspiration and expiration. A base pressure may be applied in addition to the gain-modified pressures and an elevated pressure profile may be employed to assist or control inspiration. The system may be fully automated responsive to feedback provided by a flow sensor that determines the estimated patient flow rate. A leak computer can be included to instantaneously calculate gas leakage from the system. The system may be utilized in connection with conventional continuous positive airway pressure (bi-level PAP) equipment to effect various beneficial treatment applications.

A system including methods and apparatus for treatment of a medical disorder such as obstructive sleep apnea or congestive heart failure. The system involves applying a gain to flow rate of pressurized gas delivered to a patient during inspiratory and / or expiratory phases of a respiratory cycle to deliver the pressurized gas in proportion to the respective gains during inspiration and / or expiration. A base pressure may be applied in addition to the gain-modified pressures and an elevated pressure profile may be employed to assist or control inspiration. The system may be fully automated responsive to feedback provided by a flow sensor that determines the estimated patient flow rate. A leak computer can be included to instantaneously calculate gas leakage from the system. The system may be utilized in connection with conventional continuous positive airway pressure treatments, such as CPAP or bi-level positive airway pressure equipment to effect various beneficial treatment applications.

A system including methods and apparatus for treatment of a medical disorder such as obstructive sleep apnea or congestive heart failure. The system involves applying a gain to flow rate of pressurized gas delivered to a patient during inspiratory and / or expiratory phases of a respiratory cycle to deliver the pressurized gas in proportion to the respective gains during inspiration and / or expiration. A base pressure may be applied in addition to the gain-modified pressures and an elevated pressure profile may be employed to assist or control inspiration. The system may be fully automated responsive to feedback provided by a flow sensor that determines the estimated patient flow rate. A leak computer can be included to instantaneously calculate gas leakage from the system. The system may be utilized in connection with conventional continuous positive airway pressure treatments, such as CPAP or bi-level positive airway pressure equipment to effect various beneficial treatment applications.

A gas charged spring supporting an elastomeric component and mounted to the archery bow riser. The gas charged spring applies a force against bowstring with the elastomeric component when bow is at a state of rest. Following the release of an arrow from its fully drawn position the device will decelerate the bowstring to a stop to suppress vibration and noise in the archery bow.

An accessory device described for use as a bowstring suppressor and held in place by a mounting rod fixed to the riser of a compound bow, recurve bow, long bow, or crossbow, so as to make contact with bowstring when bow is fired. Said device is made in two parts, one being a harder rubber or plastic material to mate with suppressor mounting rod for support, the second being a soft, flexible gel material that is over-molded the first part. Said over-molded gel comes into contact with bowstring upon firing of an arrow to suppress hand shock, vibration and noise in the archery implement. This arrangement was needed due to the physical properties of the gel material that prevents it from being used alone in a single molded part.

The invention provides a soft switching conversion device based on a flyback converter. On the basis of the conventional Flyback converter power topology, a clamp branch consisting of a controllable power clamper tube and a clamp capacitor is connected to a drain end of a main power tube in series; a primary side chip of the conversion device receives information such as the peak excitation current, the valley bottom excitation current and the maximum voltage of switching nodes of a converter power loop and generates ideal drive dead time varying with an input voltage and a load condition to control the main power tube and the clamper tube, so that the voltage oscillation of the drain end of the power tube caused by leakage inductance can be completely eliminated. Owing to the basically loss-free soft switching technology of the MOS tube active clamp, the stable clamp voltage value and the primary-side and auxiliary-side full working conditions, the device can work at a high frequency(> 1MHz) and can greatly increase the power density of a power adapter when being applied to the adapter.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

To determine the proper throttle amount without performing the feedback control, and to stabilize a refrigerating cycle in controlling an electronic expansion valve of an air conditioner. The optimum throttle valve opening to maximize the evaporator heat exchanging efficiency is calculated in a calculation block 71 on the basis of a calculating formula determined in advance by the experiment on the basis of an indoor temperature, an outdoor temperature, an indoor fan speed and a rotating frequency of a compressor 1, to control the electronic expansion valve 5.

A method and system for calculation of rotation dependent parameters in a system that senses shaft rotation of a toothed speed wheel. The method includes determining the passing edges of multiple gear teeth on a rotating speed wheel; calculating rotational speed of the rotating machine based on the passing edges of multiple gear teeth of the speed wheel; calculating a rotation independent tooth spacing correction factor for each gear tooth on the rotating wheel; and correcting the calculated rotational speed of the rotating machine using the tooth corrections.

The invention discloses a maximum power point tracking control method and a system thereof of photovoltaic electrical energy optimization. The maximum power point tracking control method comprises the following steps of: step one, sampling output voltage and output current of a photovoltaic electrical energy optimized photovoltaic module to obtain the output voltage and the output current, and calculating and obtaining voltage variable quantity and current variable quantity in a default time period; step two, calculating slope of the output power to the output voltage curve based on the output voltage, the output current, the voltage variable quantity and the current variable quantity; step three, determining whether the slope is less than or equal to a default error threshold, if so, executing step four, otherwise, executing step five; step four, determining whether the mean value of the slope in the default time period equals to zero, if so, determining that the system works at the maximum power point, and returning step one; and step five, changing the value of the photovoltaic electrical energy optimized reference voltage by determining sign symbol of the slope and returning the step one.

The invention provides a self-adaptive radar antenna position oscillation treating method and aims to provide a method capable of detecting characteristics of a radar antenna position automatically and eliminating position oscillation when the radar antenna position is found out. The technical scheme includes that in a tracking radar servo control system, motor current of a servo controller is taken as negative feedback of an electric current ring, motor speed is taken as negative feedback of a speed ring, a position ring is designed to be controlled proportionally and integrally, and the current ring and the speed ring are designed into servo system loops which are controlled proportionally, integrally and differentially; an operation processor arranged inside the servo controller is used for receiving and executing control commands transmitted by a radar terminal system and error information transmitted by a radar information processing system and regularly detecting errors of tracking positions of a radar antenna. When oscillation of the radar antenna position is detected, the proportionality coefficient and the integration coefficient of a servo control position loop are gradually decreased during every calculation period, and output voltage is lowered to eliminate the oscillation.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

The invention provides a multimode switching control method for body height of an electronic-control air suspension. The method includes defining the body height as three modes including 'body high position', 'body middle position' and 'body low position', utilizing a vehicle speed sensor and a body height sensor to online extract related signals reflecting actual traveling conditions of a vehicle, and determining the height mode of the vehicle according to the above signals; adjusting target modes according to different body heights, adjusting related parameters of body height control models to form three different body height control models, and respectively designing body height PID (proportion integration differentiation) controllers with different control parameters on the basis of the body height control models; establishing a switching control unit, and selecting corresponding PID controllers according to different body height adjusting target modes to perform body height control by the switching control unit. According to difference, in body height control, caused by difference in the body height adjusting target modes, targeted PID controllers are adopted for controlling respectively, so that body height control can be more accurate and more efficient.

The invention provides a time domain analysis method for a transient response of lossy nonuinform multi-conductor transmission lines and aims to solve the problem that the coupling among the lossy nonuniform multi-conductor transmission lines interferes with the computation in the field of integrity of electronic circuit signals. The method comprises the following steps of: performing differential dispersion on space differential operators in an electric wave equation; and integrating time differential operators in the electrical wave equation by a trapezoidal integration method to ensure that the oscillation, which is caused by a central difference method, of a computed result can be eliminated effectively, voltage and current transient response waveforms of any point on the transmissionlines can be acquired; and the transient analysis of the transmission lines in a longer time period is effective, the waveforms can be analyzed in a longer duration without large errors, and the coupled transmission lines are not needed to be decoupled when a model of the transmission lines is built. By the method, the computational load is reduced, and the simulation efficiency is improved. The method can be used for analyzing the transient response of the lossy nonuinform multi-conductor transmission lines.

A method for controlling dynamic response of switch power is based on a closed-loop control system including a sampling module, a dynamic control module, an error calculating module, a PID module, a mode control module and a PWM module, wherein the sampling module samples output voltage Vo, and the dynamic control module compares the Vo with set Vo max, Vo min and V ref. Whether a dynamic mode is employed is determined. When the output voltage Vo changes greatly under the dynamic mode, the voltage Vo is rapidly restored to a stable voltage by inputting large power or small power, and the load is detected by voltage change gradient to determine the working state and reduce voltage resonance. The dynamic response effect is improved.

A multi-level over-current electronic protection system for protecting a plurality of outputs includes a first solid state reversibly interruptible electronic switch including first output control logic and a plurality of first controlled output channels controlled by the first control logic. The first switching device is coupled to receive power from at least one power supply selected to power a plurality of loads. The first switching device provides power at its plurality of first output channels under normal operating conditions, wherein the first output control logic is operable for reversibly interrupting power at any of the first output channels when current in any of the first output channels exceed limits for the first output channels. At least one second solid state reversibly interruptible electronic switch including second control logic and a plurality of second controlled outputs control by the second control logic is also provided. A power supply input of the second switch is coupled to one of the plurality of first controlled output channels to receive the power, wherein the second controlled outputs are coupled to provide the power to the plurality of loads under normal operating conditions and reversibly interrupting the power for any of the second output channels when current in any of said second output channels exceeds limits for the second output channels. A CPU having associated firmware can be coupled to the second output channels and external inputs of the second switches via an isolation device to provide a supervisory and monitoring function.

The invention relates to the field of integrated navigation systems, in particular to a method for compensating external measurement information based on a SINS / DVL integrated navigation system. The method comprises the following steps of obtaining initial position information of a carrier according to the global positioning GPS system, importing the information into a navigation computer to perform preheating of the fiber optic gyro strap-down inertial navigation SINS system, obtaining a carrier attitude angle according to the fiber optic gyroscope and the quartz accelerometer, carrying out initial alignment and establishing an initial strap-down matrix, obtaining the information about angular motion and linear motion of the carrier according to an inertial component IMU, carrying out navigation solution to obtain a strap-down matrix, establishing a Kalman filter model, correcting to obtain a strap-down matrix corrected by the Kalman filter model, and compensating the strap-down matrix corrected by the Kalman filter model in the step four to the DVL speed measurement according to the SINS / DVL measurement equation of DVL speed measurement. The method provided by the invention can suppress errors during the DVL speed measurement and improve the accuracy of the DVL speed measurement by estimating the attitude of the carrier during the navigation process of the carrier and compensating the attitude to errors of the DVL speed measurement, and is simple and easy to operate.

The invention provides a simulation method of multistep variable step size which is capable of considering any multiple events in electromagnetic transient calculation, namely, event search is carried out to every step of calculation; precise occurrence time of an event is obtained; re-calculation is carried out till the position of a break point, the event is solved, the sequencing problem of the multiple events happening synchronously or within a simulated step size is solved; and then multistep variable step size backward Euler method is adopted to completely eliminate numerical oscillation occurring in electromagnetic transient simulation. The method precisely calculates the occurrence time of the event, can completely eliminate the numerical oscillation and process event sequence with arbitrary combination, and is suitable for the electromagnetic transient technology of a system of a power electric device provided with mass quick break.

Embodiments provide a lens moving apparatus including a housing for supporting a first magnet, a bobbin including a coil disposed on an outer surface thereof and inside the first magnet so as to move in the housing in a first direction parallel to an optical axis by electromagnetic interaction between the first magnet and the coil, and upper and lower elastic members, each of which is provided at the bobbin and the housing and includes an inner frame coupled to the bobbin and an outer frame coupled to the housing, wherein at least one of the upper and lower elastic members is constituted by a printed circuit board.

External-cavity optically-pumped semiconductor lasers (OPS-lasers) including an OPS-structure having a mirror-structure surmounted by a surface-emitting, semiconductor multilayer (periodic) gain-structure are disclosed. The gain-structure is pumped by light from diode-lasers. The OPS-lasers can provide fundamental laser output-power of about two Watts (2.0 W) or greater. Intracavity frequency-converted arrangements of the OPS-lasers can provide harmonic laser output-power of about one-hundred milliwatts (100 mW) or greater, even at wavelengths in the ultraviolet region of the electromagnetic spectrum. These high output powers can be provided even in single axial-mode operation. Particular features of the OPS-lasers include a heat sink-assembly for cooling the OPS-structure, a folded resonator concept for providing optimum beam size at optically-nonlinear crystals used for frequency conversion, preferred selection of optically-nonlinear materials for frequency-conversion, and compound resonator designs for amplifying second harmonic-radiation for subsequent conversion to third or fourth harmonic radiation.

A clean out sub for use in a drill string having a tool body with a cavity for passage of drilling fluid and annular fluid circulation ports extending through the tool body, a valve spool is positioned within the tool body cavity having a reduced diameter orifice, a compression spring is located within the tool body cavity adjacent the valve spool, wherein a drop in fluid pressure created by the orifice imparts a downhole force on the valve spool and at a predetermined force overcomes a set resistive force of the compression spring thereby moving the valve spool to open the annular fluid circulation ports.

The invention discloses a maximum power point tracking controller for a three-phase photovoltaic power generation system. The controller mainly comprises a BOOST type DC / DC converting circuit, a three-phase inversion circuit, a control circuit and a power circuit. The technical scheme includes that a variable-structure fuzzy control method is applied to MPPT (maximum power point tracking) of photovoltaic power generation so that tracking precision can be improved, and the method can effectively realize maximum power point tracking when illumination and temperature vary. By means of variable-structure fuzzy control, different fuzzy sub-controllers are designed according to different working conditions, the discourse domain range, control rules, parameters and the like of the fuzzy sub-controllers are different, the fuzzy sub-controllers form a variable-structure fuzzy controller, and accordingly one fuzzy sub-controller constantly enables the system to achieve the optimal control quality in system running.

The invention discloses a solar photovoltaic maximum power tracking control method. The solar photovoltaic maximum power tracking control method comprises the following steps that step 1, maximum power tracking is carried out by adopting a variable step perturbation observation method; step 2, after entering a parabola fitting region R, a maximum power point is tracked and determined according toa parabola approximation method; step 3, according to the change of the external environment, the step length is adjusted in real time, the size of the step length is changed dynamically, and maximumpower tracking control is carried out. The solar photovoltaic maximum power tracking control method has the advantages that the position of a working point of a solar photovoltaic system is judged byadopting the perturbation observation method; firstly, it is judged whether or not fitting voltage enters the fitting region R and satisfies fitting conditions, finally, a parabola curve equation is obtained, the voltage and maximum power of the maximum power point are solved, the method eliminates the occurrence of oscillation and misjudgment of a traditional algorithm near the maximum power point, so that a system can accurately track the maximum power, the response time is short, the oscillation is small, and the dynamic error is also smaller.

The invention relates to a servo controller, a servo control system and a servo control method. The servo controller comprises a Kalman filtering operation module used for acquiring error signals and conducting data forecasting smoothing treatment on the error signals so as to smooth the error signals within the processing period to be linear, and a fuzzy-PID module used for formulating a fuzzy rule list, adjusting PID operation parameters according to the fuzzy rule list, and conducting PID operation on the error signals subjected to data forecasting smoothing treatment according to the PID operation parameters so as to obtain servo driving signals. Compared with the prior art, the servo controller has the advantages that realization is easy, hardware requirement is low, automatic target signal tracking precision and efficiency can be effectively improved, and orbital tracking simulation can be conducted.

The drum pedal stabilizer is designed to eliminate the problems of beater dropout, pedal and beater oscillation, drum head retrigger, tempo influence and jitter feel on drum pedals and beaters. Specifically, the present invention is directed to a stabilizer having a mounting plate and a gas spring adapted for attachment to a drum pedal to counteract oscillation of the conventional helical spring. The stabilizer may be an aftermarket attachment to conventional drum pedals, or may be incorporated as original equipment in new drum pedal assemblies.

A system for insertion of a probe into a pressurized fluid stream by means of a threaded body formed to engage an elastomeric seal employed to form a fluid barrier thereabout. The present invention contemplates a system which effectively lessens resonance vibration effects and associated damage resulting there from in fluid sampling probes operating in high velocity fluid streams and the like, utilizing mechanical dampening properties associated with its seal(s) and insert(s), forming non-rigid attachment to support the length of the probe in a manner which facilitates resonance absorption and dampening, so as to lessen associated vibration / oscillation in the system. The threaded body forms, in effect, helical strakes to facilitate aerodynamic stabilization and reduce oscillations / vibration, as well as reduce force and deflection caused by high velocity fluid flow passing thereby.

A gas concentration measuring apparatus is provided which may be employed in measuring the concentration of oxygen contained in exhaust emissions of automotive engines. The apparatus includes a gas sensor equipped with a solid electrolyte body and a pair of electrodes affixed to opposed surfaces of the solid electrolyte body. The apparatus includes an applied voltage controller which works to apply the voltage to the electrodes of the gas sensor to create an electric current as a function of a concentration of gas to be measured. The applied voltage controller is designed to have an enhanced gain of the voltage to the value of the current, as produced by the gas sensor, in a predetermined frequency band, thereby increasing the response of the gas sensor without inducing the oscillation of the voltage to be applied to the gas sensor.

A highly sensitive low loss and low flow fluid flow switch is coupled with an automatic timer and / or optional transmitter to indicate the flow of gas to an appliance and to automatically start a reminder timer to turn the appliance off. After a preset time limit has expired, the timer either sounds an alarm or wirelessly triggers an alarm in a remote location. The receiver portion of the wireless timer may be mounted directly to the appliance (grill handle), so that the timer automatically resets when activity (cover opening or closing) is detected, indicating the appliance is still in use. An alarm can also be configured to sound when the grill is attempted to be ignited with the cover closed, thereby avoiding a potential explosion. A biasing attraction magnet is incorporated in the fluid flow switch to offset either the force of gravity or a return spring in order to extend performance to low pressure and low flow applications. The piston is sealed for use in high pressure / low flow applications, and provided with a vent hole for residual gas bleed-off upon a stoppage of gas flow.

The invention discloses a multi-model integrated intelligent controlling method of a heavy-duty generator unit. The method comprises (1) constructing a model library and a controller library, wherein the model library comprises N submodels corresponding to the N operation conditions of the generator unit, the controller library comprises N submodel fuzzy controllers, each is designed a control rule corresponding to one submodel; each submodel fuzzy controller is the controller with double inputs and double outputs, the inputs are power angle deviation amount e delta and terminal voltage deviation amount u2, and the outputs are excitation regulation amount uf and valve opening regulation amount u2; (2) acquiring the real-time operating conditions data of the generator unit, and judging the actual operating conditions value based on the variable (delta, Vt); and (3) calculating the matching degree fn of the actual operating conditions value (delta, Vt) and N submodels in the model library, which is used as a weighting coefficient wn (n is an integer) of the integration of the integrated controller. The invention has the advantages of simplicity, good reliability, good real-time performance, high control accuracy, and good practical performance.