340 results about "Active compensation" patented technology

An electrical connector is provided for operation in a point-to-point application. The connector includes an insulated housing having first and second card interfaces configured to mate with associated first and second circuit cards. An electrical wafer is held in the housing and configured to operate in a point-to-point architecture. The signal traces end at signal contact pads located proximate to first and second edges, respectively. The signal contact pads receive a unidirectional signal. Each of the signal traces include a break section at an intermediate point along a length thereof to form a disconnect in the signal traces. The connector further includes an active compensation component bridging the break section in the signal traces. The active compensation component compensates the differential signal incoming from the input contact pads for signal degradation and transmits a compensated signal outward to the output contact pads. The active compensation component transmits the signal only in a single direction within the point-to-point architecture.

An ablation catheter system configured with a compact force sensor at a distal end for detection of contact forces exerted on an end effector. The force sensor includes fiber optics operatively coupled with reflecting members on a structural member. In one embodiment, the optical fibers and reflecting members cooperate with the deformable structure to provide a variable gap interferometer for sensing deformation of the structural member due to contact force. In another embodiment, a change in the intensity of the reflected light is detected to measure the deformation. The measured deformations are then used to compute a contact force vector. In some embodiments, the force sensor is configured to passively compensate for temperature changes that otherwise lead to erroneous force indications. In other embodiments, the system actively compensates for errant force indications caused by temperature changes by measuring certain local temperatures of the structural member.

Optical cells are non-actively compensated to ensure that a sample gap of a sample space remains nearly constant upon a change in temperature. Fluids can be flowed through the sample space of the optical cells.

A suspension system for a seat of a vehicle comprises a base, a linkage, and a seat attached to the base via the linkage. A pneumatic shock absorber provides a respective resistance level against movement of the seat with respect to the base based on a corresponding pressure level of air or gas within the pneumatic shock absorber. An output member of a linear motor is connected to the seat via a bracket. A first sensor is arranged to detect first sensor data associated with an instantaneous position of the seat versus time. A controller generates at least one of a first control signal for the linear motor to change a height of the seat in opposition to a change in the instantaneous position of the seat and a second control signal to change the pressure level.

Systems and methods for enhanced quantum key distribution (QKD) using an actively compensated QKD system. The method includes exchanging quantum signals between first and second QKD stations and measuring the quantum signal error. An error signal SE representative of the system visibility error is then generated. An error-signal threshold STH that defines a system visibility error limit is then selected. Those qubits measured with the condition SE>STH are called “above-threshold” qubits, while those qubits measured with the condition SE≦STH are called “below-threshold” qubits. Only below-threshold qubits are stored and used to form the final quantum key. This is accomplished by sending a blanking signal SB to the memory unit where the qubits are stored. The blanking signal prevents above-threshold qubits from being stored therein. The raw quantum key so formed has few errors and thus forms a longer final quantum key for a given number of exchanged quantum signals.

Active compensation techniques are used for control of temperature, wavelength, and other characteristics of lasers within a laser array. The laser array includes a plurality of lasers and a plurality of dissipation elements. The dissipation elements can be interstitial to the lasers and can be implemented as non-lasing diodes. The dissipation elements are selectively activated (i.e., turned “on” to dissipate power) to adjust the temperature at the laser junctions. The change in junction temperature allows the lasers to operate at their specified wavelengths. The dissipation elements can be individually controlled and two or more bits of resolution can be provided. Active compensation can be used to adjust (i.e., to compensate) the temperature of selected lasers when one or more lasers are deselected. Active compensation can also be used to adjust (i.e., “tweak”) the wavelengths of the lasers within the laser array to be within their specified wavelengths.

What is disclosed is an image processing method to reduce streaking on a printed sheet. The method uses a negative feedback system to reduce streaking. The feedback system consists of a scanner that scans a printed sheet corrected with an error signal. The error signal is obtained from the scanned image of a previous print off the same printer and the desired output. There are a number of error signals in different positions across the process direction which adjust TRC values. The present invention makes use of a spatial filter representing the spatial frequency sensitivity of the human eye such that only differences (errors) of importance in need of correction are those which can be seen by the human eye. More specifically, a spatially distributed controller is utilized to improve sensitivity to measurement and printer noise. The printer adjusts the incoming bitmap so that each column in the image gives the same response for the same gray level. The printer sacrifices the uniformity of the responses at low and high frequencies where the eye is not responsive so that it can achieve better control at mid-frequencies where the eye is more responsive. At each iteration and for a fixed desired gray-level, the controller processes differences between desired output gray-levels and the values of the gray-levels obtained on the printed output image. A spatial filter is used to emphasize ranges of spatial frequencies critical for a human observer. Then, from these filtered differences (errors), TRC corrections to be applied to the output image are computed using simple scalar integral controllers. Advantageously, since the present invention compensates for defects introduced by lower quality components in a printer, printers can be less tightly specified.

The invention particularly relates to a design and setting method for an active disturbance rejection control system of a time delay system. According to the method, based on the active disturbance rejection technology, firstly, complex controlled objects are fit into a one-order inertial element plus dead time delay mathematic model, meanwhile, time delay comes down to the disturbance quantity, a time delay reduction linear extended state observer is applied to estimation of unknown total disturbance including the time delay, active compensation for the influences of the total disturbance on the system is achieved, the time delay system is restored into a system in an integrator tandem type in an ADRC standard, and then compensation for the time delay system is achieved; finally, a closed-loop transfer function of the system is deduced, a dead time delay link in a characteristic equation is eliminated, and the numerical relationship between an ADRC single-parameter setting formula with universality and adjustable parameters is correspondingly provided. The simulation result verifies that designed practical ADRC has good stability, rapidity, accuracy and disturbance rejection.

The invention discloses a movable cold atom absolute gravitational acceleration sensor, which belongs to the field of precise measurement of absolute gravitational acceleration. The sensor is composed of a vacuum unit, an optical path unit, a magnetic shielding unit, a passive vibration isolation platform, an accelerometer, an inclinometer and the like. Among them, the vacuum unit is mainly made of glass materials, and it is directly connected with the optical path unit in free space; the magnetic shielding unit is used to reduce the influence of the external magnetic field on the absolute gravity measurement; the passive vibration isolation platform is used to suppress Interference from ground vibration and noise; in addition, the accelerometer and inclinometer are mainly used for active compensation of random vibration and acquisition of vertical lines, and are assisted in absolute gravity measurement. The present invention is characterized in that the vacuum unit has a high degree of freedom for light transmission, is small in size and light in weight, and is directly connected with the optical path unit so that the measurement system is compact, stable and highly adaptable to the environment. The invention mainly solves key technical problems such as miniaturization, light weight and mobility of the cold atom absolute gravimeter.

The invention discloses a marine dining table with a six-DOF (degree of freedom) wave active compensation function and a compensation method. The marine dining table is characterized in that a rotary platform parallel to an upper platform is arranged right above the upper platform, and a table top is fixedly connected right above the rotary platform through table legs; the center of the rotary platform is connected with an upper end of a vertical transmission shaft, the lower end of the transmission shaft extends out of a center hole in the upper platform with clearance and is coaxially and fixedly connected with an output shaft of a hydraulic motor; an angle sensor is arranged the lower end of the transmission shaft, five servo cylinders are connected between the upper platform and a lower platform, one servo cylinder is vertically connected to centers of the upper platform and the lower platform, and the other four servo cylinders are uniformly arranged in the circumferential direction of the edges of the upper platform and the lower platform and are mounted in an inclined manner; the vertical servo cylinder compensates heaving motion, the four inclined servo cylinders compensate swaying motion, surging motion, heaving motion, rolling motion and pitching motion, and the hydraulic motor compensates yawing motion, therefore, one safe and stable dining table is provided when a ship is in a swinging state.

The invention discloses an active heave compensation control system comprising a ship kinematic parameter detection module, a DSP control module and an execution module, wherein the kinematic parameter detection module comprises an accelerated speed sensor, a dip angle sensor, a first rotary encoder, a second rotary encoder and a signal conditioning circuit; the execution module comprises a main hydrauservo system, a secondary hydrauservo system and a differential planetary drive windlass. The invention has the following characteristics: 1. a feedback control mode is combined with a feed-forward control mode; 2. the active compensation of weight lowering speed is realized by detecting and predicting the ship kinematic parameter; 3. the heeling movement and the trimming movement of the ship are converted into heaving movement by the dip angle sensor to realize the heave compensation in three degrees of freedom, namely, heeling, trimming and heaving; and 4. the differential planetary drive windlass is used to realize speed composition of the feedback control and the feed-forward control.

A suspension system for a seat of a vehicle comprises a base, a linkage, and a seat attached to the base via the linkage. A pneumatic shock absorber provides a respective resistance level against movement of the seat with respect to the base based on a corresponding pressure level of air or gas within the pneumatic shock absorber. A set of cylindrical members are spaced apart beneath the seat. A tension member is arranged to engage the cylindrical members. The tension member is attached to the seat via a bracket. An electric motor is capable of driving one of the cylindrical members. A first sensor is arranged to detect first sensor data associated with an instantaneous position of the seat versus time. A controller generates a first control signal for the electric motor to change a height of the seat in opposition to a change in the instantaneous position of the seat and a second control signal to change the pressure level.

The invention relates to a winch heave compensation device for an ocean floating drilling platform. The device comprises an active compensator and a passive compensator which are arranged on one side of a winch in parallel. The active compensator comprises a first single-rod piston cylinder with a piston rod stretching upwards and a force transducer, wherein two chambers of the first single-rod piston cylinder are connected to a hydraulic system through a three-position four-way magnetic exchange valve, and the force transducer is used for detecting force on a steel wire rope and electrically connected with a force feedback controller which controls exchange actions of the three-position four-way magnetic exchange valve. The passive compensator comprises a second single-rod piston cylinder with a piston rod stretching upwards. Tops of the piston rods of the first piston cylinder and the second piston cylinder are connected onto a movable pulley, a fixed pulley is further arranged on the drilling platform, and the steel wire rope on the winch is connected with a crown block and a traveling block after bypassing the movable pulley and the fixed pulley sequentially. According to the device, the compensation effect that active compensation and passive compensation are mutually synchronous and promoted can be achieved.

A two-way actively stabilized QKD system that utilizes control signals and quantum signals is disclosed. Because the quantum signals do not traverse the same optical path through the system, signal collisions in the phase modulator are avoided. This allows the system to have a higher transmission rate than a two-way system in which the quantum signals traverse the same optical path. Also, the active stabilization process, which is based on maintaining a fixed relationship between an intensity ratio of interfered control signals, is greatly simplified by having the interferometer loops located all in one QKD station.

The invention discloses a magnetic field stabilizing method and device for a magnetic resonance imaging system. According to the magnetic field stabilizing method, a group of active compensating coils is arranged in a magnet, real-time magnetic field frequency drift amount is acquired, the current magnitudes and change rates of the active compensating coils are set, and the magnetic field change of a main magnet is compensated in real time by using a generated magnetic field, so that a total magnetic field is kept stable, and drift of the magnetic field is eliminated. The magnetic field stabilizing device comprises a group of active compensating coils (201) for generating a compensating magnetic field, a constant-current source (205) for driving the active compensating coils, and a constant-current-source controller (204) for controlling the current magnitude and direction of a constant current source. By adopting the method, the main magnetic field of the magnetic resonance imaging system can keep stable in a scanning process, and the quality of images is improved greatly.

The inventions presented herein provide a electronically controlled phase shifters that incorporate analog and digital phase shift architectures in a novel manner that realizes the best advantages of each architecture. This combination of complementary phase shift architectures provides the high-performance and low loss characteristics of switched digital phase shift architectures with the high resolution and precision of continuous analog phase shift architectures. The circuit embodiments are electronically controlled, which simplifies implementation of what is a complex circuit. The analog phase shift elements comprise electronically-tuned varactors, which provide fine resolution and enables the incorporation of active compensation for manufacturing variation before use or for environmental conditions during use.

The technology described herein provides an active driver control system. Additionally, in various example embodiments, this technology provides methods for optimizing fuel economy (or energy consumption) through active compensation of driver controlled inputs. The active compensation functionality is used to moderate ‘sweet spot’ vehicle response with driver desired performance. In particular, the active compensation functionality can be used to smooth the vehicle response and attenuate undesired frequency content from the driver input. One of the benefits to this technology is that it assists all drivers in achieving better fuel economy in real world driving. Another benefit is that active compensation of driver controlled inputs can mitigate some of the negative effects of more aggressive driving styles. In addition to active compensation functionality, the technology described herein is also capable of generating a Green Driver Index which is derived by quantifying the driver's control ability and normalizing the result against desired fuel economy and performance targets.

The invention discloses a linear active-disturbance-rejection control method and device for an electro-hydraulic position servo control system. The method comprises the steps: obtaining a dynamic active compensation control law at a next moment in a linear active-disturbance-rejection controller through an inputted current piston displacement quantity and a current dynamic active compensation control law via the joint effect of a tracking signal generator, a linear expansion state observer and a state feedback controller according to an electro-hydraulic position servo system mathematic model,and inputting the data into a proportional valve, and performing the above steps in a periodic manner, thereby achieving the real-time dynamic compensation for the total disturbance. The method is high in precision, is good in stability, is strong in anti-interference capability, solves a problem that the PID parameter setting is difficult, and avoids the impact on the performances of a control system from the nonlinearity and uncertainty.

A metrology system includes a laser, a position sensitive detector array, a first collimator, a second collimator, and a mirror. The position sensitive detector array and the first collimator are positioned at a reference point. The second collimator and the mirror are positioned at a point target at a distance from the reference point. A laser beam is alternately provided to the first collimator and the second collimator by optical fiber. The position sensitive detector array measures position data from a first laser crosshair generated by the first collimator and from a second laser crosshair generated by the second collimator. By alternating the activation of the first collimator and the second collimator it is possible to measure 5 degrees-of-freedom for the point target. A metrology system processing unit provides analog data processing. The metrology system that is suitable for, but not limited to, facilitating active compensation of large spacecraft structures.

A metrology system includes a laser, a position sensitive detector array, a first collimator, a second collimator, and a mirror. The position sensitive detector array and the first collimator are positioned at a reference point. The second collimator and the mirror are positioned at a point target at a distance from the reference point. A laser beam is alternately provided to the first collimator and the second collimator by optical fiber. The position sensitive detector array measures position data from a first laser crosshair generated by the first collimator and from a second laser crosshair generated by the second collimator. By alternating the activation of the first collimator and the second collimator it is possible to measure 5 degrees-of-freedom for the point target. A metrology system processing unit provides analog data processing. The metrology system that is suitable for, but not limited to, facilitating active compensation of large spacecraft structures.

The invention discloses an active compensation method for power grid grounding capacitance current. The method is realized through arranging a power electron commutation assembly and a corresponding detection and control assembly between a three-phase bus and the ground in a neutral-point small-current grounding mode power grid. When single-phase grounding fault happens to the power grid, the power electron commutation assembly compensates ungrounded phase-to-ground capacitance current to enable current through a grounding point to be close to zero, system overvoltage caused by interrupted arcs can be avoided, a neutral-point grounding transformer and an arc suppression coil are replaced, and the asymmetric power frequency component and the high-frequency component of the capacitance current can be compensated.

The invention relates to ocean exploration equipment, which belongs to the field of ocean exploration. A heave compensating control system of the ocean exploration equipment comprises exploration equipment, a lifting truck, a guide pulley and a compensating oil cylinder, wherein the lifting truck and the exploration equipment are connected by steel wires, and the guide pulley and the compensating oil cylinder are arranged between the exploration equipment and the lifting truck, the steel wires connecting the exploration equipment and the lifting truck lead out from the lifting truck and are wound on the guide pulley and connected with the exploration equipment after being wound on the compensating oil cylinder, a steel wire tension sensor is mounted on the guide pulley, the compensating oil cylinder is connected with an energy storage device, the steel wire tension sensor transmits signals to a heave compensating controller, the heave compensating controller is connected with the lifting truck and controls the lifting truck to adjust the exploration equipment. By combining the oil cylinder and tension compensation and combining active compensation and passive compensation, the heave compensating control system is applicable to various wave conditions, energy-saving and high in efficiency, can be closer to field conditions and high in control speed due to real-time feedback.

The invention relates to a voltage control method in a power system with a non-effectively earthed neutral. Power current with adjustable amplitude value and phase position is injected in a system neutral, and three phases of voltage to earth and zero sequence voltage of the system are adjusted and controlled. The recovery degree and the recovery speed of the three phases of voltage and the zero sequence voltage can be delayed by the technology after the arc blowout of a small current grounding fault point, and enough time is provided for the insulation recovery of the fault point, so that the restriking probability is reduced, and the self-recovery (self-healing) probability of fault is improved. When the system is in normal operation, unbalanced voltage caused by the imbalance of the three phases of parameters to earth such as untransposition of circuits or incomplete transposition of the circuits is eliminated. The technology can be realized by an independent device, and also can be realized by an active compensation device platform for full electrical capacity compensation in a small current grounding fault. The voltage control method in the power system with the non-effectively earthed neutral disclosed by the invention is used as a main technical measure of a smart distribution grid, and the power quality and the self-healing level of the fault of a medium voltage distribution grid can be observably improved.

The invention discloses an injection current two-point calculation method employing active inverter to control a fault phase voltage to be zero after a small-current grounding fault. The method can calculate the transitional resistance of a fault point and the injection current, which enables the fault phase voltage to be zero, according a fault phase power voltage, two different injection currents and corresponding bus zero sequence voltages. The method can adapt to the dynamic change of a line structure, is high in precision when the transitional resistance is larger, and solves a problem that a conventional active arc-distinguishing technology (active compensation technology or flexible grounding technology) cannot reflect the dynamic change of the line structure in real time during the calculation of the injection current.

The invention relates to a daylight illumination apparatus. A daylight collector (3) collects daylight (4), which is guided to an illumination location to be illuminated along an optical path by a light guide (5), wherein the daylight is absorbed by the light guide. A photoluminescent material (6, 8) is arranged within the optical path and emits photoluminescent light that compensates for the absorption of the daylight by the light guide. Absorption losses of the daylight can therefore effectively be compensated, without necessarily needing, for example, an active compensation light source. This allows providing compensated day-light illumination in a technically relatively simple way.

The invention relates to the arc quenching and voltage stabilization technology of a power distribution network neutral point grounding fault point and particularly relates to an intelligent power distribution network neutral point grounding active full-compensation control system. The intelligent power distribution network neutral point grounding active full-compensation control system is characterized in structure by comprising a data acquisition system, a control circuit, a driving circuit, an inversion circuit, a filter circuit, an access circuit and a control power source, wherein a data acquisition end of the data acquisition system is connected with an electric power system, an output end of the data acquisition system is connected with the control circuit, a control output end of the control circuit is respectively connected with the driving circuit and the control power source, and the inversion circuit is connected with an input end of the electric power system respectively through the filter circuit and the access circuit. The system is advantaged in that a voltage recovery open loop and closed loop control method taking a dissonance degree, a damping rate, reactive compensation current and active compensation current as parameters is provided according to analysis, timely self-healing of a fault is guaranteed, moreover, the system voltage can recover to a normal state rapidly.

Systems and methods for performing quantum key distribution (QKD) that allow for an improved signal-to-noise ratio (SNR) when providing active compensation for differences that arise in the system's relative optical paths. The method includes generating at one QKD station (Alice) a train of quantum signals having a first wavelength and interspersing one or more strong control signals having a second wavelength in between the quantum signals. Only the quantum signals are modulated when the quantum and control signals travel over the first optical path at Alice. The quantum and control signals are sent to Bob, where only the quantum signals are modulated as both signal types travel over a second optical path at Bob. The control signals are directed to two different photodetectors by an optical splitter. The proportion of optical power detected by each photodetector represents the optical path difference between the first and second optical paths. This difference is then compensated for via a control signal sent to a path-length-adjusting element in one of the optical paths. The control signals provides a high SNR that allows for commercially viable QKD system that can operate with a high qubit rate and a small qubit error rate (QBER) in the face of real-world sources of noise.

The invention relates to a distributed energy grid connection and reactive compensation composite control method, which comprises the following processes of obtaining real-time grid voltage VS, system current IS and DC bus voltage Vdc through a collection module and then transmitting the real-time grid voltage VS, the system current IS and the DC bus voltage Vdc to a digital signal processor DSP; and obtaining reactive current and grid-connected current in a load through calculation, comparing the reactive current and the grid-connected current with a set adjustment target value, generating a fixed-frequency PWM pulse through a PI controller to drive an inverter power tube IGBT to be turned on and turned off, controlling output of each phase of grid-connected current and compensation current of a system, and outputting the maximum grid-connected power by the system in an active priority mode, firstly compensating the reactive current of the system in a regional reactive priority mode and providing the system with active compensation and reactive compensation in a regional balance mode. Through controlling output of each phase of grid-connected current and compensation current of the system, a distributed energy access device can be more intelligently used for a regional power grid and has the characteristic of high grid-connection efficiency.