258 results about "Axis–angle representation" patented technology

A mobile telecommunications device comprising: an inkjet printhead for printing to a media substrate; a drive shaft for feeding the media past the printhead; and, a print engine controller for operatively controlling the printhead; wherein during use, the print engine controller senses the number of complete and partial rotations of the media feed roller and adjusts the operation of the printhead in response to variations in the angular velocity of the drive shaft.

The invention relates to a multiturn absolute rotary encoder based on a rotary transformer, which is characterized in that: a sensor is displaced by taking the rotary transformer as a shaft angle; a shaft angle decoding circuit can be formed by adopting DSP as a core processor; a sine wave which can be controlled by frequency and phase in the method that the circuit is synthesized by direct digital frequency for the numerical control of an oscillator; and the sine wave is directly taken as an excitation rotary transformer signal via a power amplifier and a filter circuit; the rotary transformer signal is transferred to A / D converter after being run through a matching circuit of electronic transformer; after sampling, digital filtering and digital signal processing, the sine and cosine value for the actual angle of two channels is generated; the angle error change is tracked dynamically by the PI algorithm; the mechanical displacement of the rotating object is converted into digital shaft angle position and speed. The multiturn absolute rotary encoder based on a rotary transformer has the advantages of high tracking speed, high conversion accuracy, high reliability, simple structure, sensitive movement, low environmental condition, strong anti-interference capability, high measuring accuracy and speed voltage output.

A multi-axis accelerometer or a multi-axis angular rate sensor which can be made by an easy process and the size of which can be greatly reduced is provided. An inertia sensor has a substrate, a flat proofmass formed on the substrate and a stacked structure including at least a lower electrode, a piezoelectric film, and an upper electrode, an anchor unit formed in a cutout inside of the proofmass and fixed on the substrate, and a plurality of flat piezoelectric beams each having one end connected to the proofmass, the other end connected to the anchor unit, and a stacked structure formed in a cutout inside of the proofmass and including at least a lower electrode, a piezoelectric film, and an upper electrode, wherein the inertia sensor enables to detect an acceleration applied on the proofmass based on charges generated to the electrodes of the piezoelectric beams.

A failure monitor designed to monitor a failure in operation of a motor drive control system. The system works to drive a motor-driven member through an output shaft and an electric motor and includes an output shaft angular position sensor for determining an angular position of the output shaft and an encoder for determining an angular position of the motor for use in controlling the motor. The system works to discriminate among failures in operation of the output shaft angular position sensor and the encoder and another type of a failure using outputs of the sensors.

A subjective refraction technique uses a plane wave light source including substantially a point as a viewing target. The refraction method provide for a number of distinct identifiable end points. By finding such end points the process leads to an aberration-corrected vision. A defocus corrector assembly (DCA) includes a lens that is moveable along an optical axis between a patient's eye and the point light source for adjusting defocus power until the patient indicates that the blurry image has become a relatively focused line image. An astigmatism corrector assembly (ACA) which is capable of continuously variable in its amplitude is provided including a pair of astigmatism plates for adjusting astigmatism power and axis angle. The ACA is adjusted until the patient indicates that the line image has become a substantially round image. A reference marker provides displayed items including a sweep line overlapping at the point source and having an orientation which is adjustable. The patient may subjectively control the sweep angle of the sweep line and indicate that the sweep line is aligned with the sharp line image of the point source, thereby providing axis angle data of astigmatism errors of the patient's eye.

Without using a traveling velocity of a vehicular object mounted with a radar device, an off-axis angle which is an offset angle between a reference direction of the radar device and a traveling direction of the vehicular object is estimated. An off-axis angle estimation method for estimating an off-axis angle (φ) of a radar device (1) mounted on the vehicular object having a predetermined traveling direction includes that, from among reflection points of which a relative-velocity component (q) along the line of radar sight and an azimuthal angle (θ) are detected by the radar device (1), a plurality of reflection points of which the relative-velocity components in the traveling direction of the vehicular object being approximately equal to one another is selected without using the traveling velocity of the vehicular object; and based on the relative-velocity components along the line of radar sight, and on the azimuthal angles, of the plurality of reflection points having been selected, the off-axis angle (φ) is autonomously calculated solely from the observed values based on radar waves.

A method for operating a wind turbine generator includes generating at least one of a plurality of rotor shaft angular displacement values, a plurality of rotor shaft angular velocity signals, and a plurality of rotor shaft angular acceleration signals. The method also includes determining a torsional moment within a rotor shaft, and modulating at least one of a wind turbine generator yaw orientation and a blade pitch orientation as a function of the determined torsional moment.

The invention relates to a method and a device for detecting the position of a rotor of a brushless motor, which are characterized in that a rotary transformer and the rotor of a tested brushless motor are arranged coaxially, the rotary transformer outputs two paths of orthogonal high-frequency sine-cosine signals containing information about the position of the rotor, and the information about the position of the rotor is obtained by the methods such as signal conditioning or resolving and the like. The most widely applied integrated chip at present adopting a special Resolver-to-Digital converter (RDC for short) and the like and a peripheral configuration circuit are used for performing resolving, and a special resolving chip of the type is sensitive to signals and has no fault-tolerant function, so the reliability is difficult to guarantee. The device of the invention is provided with a simple signal conditioning circuit on the basis of an RDC functional circuit to realize the detection of the position of the rotor of the brushless motor with self-monitoring and fault tolerance functions.

A calibration compensation method of angle-measurement error of a rotating transformer based on a rate rotary table; the calibration method obtains the dynamic continuous output of the rotating transformer through a dynamic calibration test of a digital calibration system, so as to calibrate the cycle error term coefficient of the rotating transformer; calibrates the one degree term and zero degree term errors of the rotating transformer through a static calibration test; completes precise error calibration of the rotating transformer through the dynamic and the static tests; and later, builds a model to compensate the calibrated rotary error. The invention integrates the advantages of the dynamic and the static calibration methods, is not restricted by precision of an angle measuring device, is easy and simple; the built error compensation model of the rotating transformer greatly improves the angle-measuring precision of the rotating transformer. The method is also applicable in calibration and compensation of all other shaft angle sensors as well as the angle-measuring precision.

The invention relates to the precision shaft angle measuring instrument precision detection filed, more particularly to an angle measurement precision detection apparatus of an encoder and a detection method thereof. The apparatus comprises a coupling assembly, a precision main shaft, a motor, a precision encoder, a connection base, a rotary table, a workbench, and a computer system. The precision encoder is employed as a reference and is connected with the precision main shaft coaxially. The precision main shaft is driven by the motor; and an output shaft of the precision main shaft is connected with a detected encoder. The computer controls the rotating speed and the position of the motor as well as simultaneously collects angle measurement data of the precision encoder and the detected encoder; and an error value representing deviation of the position output of the detected encoder from the position output of a reference precision encoder is obtained in rotation angles from 0 degree to 360 degrees of the precision main shaft. And processing is carried out by the computer to provide various measurement errors of the detected encoder and error frequency spectrums. According to the invention, beneficial effects are as follows: there are lots of measurement points and measurement can be carried out continuously, so that various errors of a detected encoder can be reflected; a frequency spectrum analysis on an error source can be carried out; automatic measurement is carried out, the measuring period is short and efficiency is high; and electronization of data processing is realized as well as detection data are filed.

The present invention provides an attitude sensing device and an attitude sensing method, and in particular techniques for determining an attitude in three-dimensional space of a reference axis of a package with which the attitude sensing device is associated. The attitude sensing device comprises an electromechanical sensor having a rotatable shaft operable to rotate about its axis to any shaft angle and a mass coupled to the shaft. The mass causes the shaft to rotate as the mass adopts a gravity-induced position. The electromechanical sensor is operable to provide an electrical signal in dependence on the shaft angle. The attitude of the reference axis being derivable from the electrical signal. By this approach, a simple arrangement is provided by which the attitude of the reference axis may easily be determined over the required operating range.

A vibrating inertial rate sensor has operational elements that define axes that are rotationally offset or “skewed” from a node or anti-node reference axis. The skew may be relative to separate node or anti-node reference axes, or take the form of an element that is “split” about the same node axis. Both the drive signal and the sense signal may be resolved from a common set of sensing elements. The drive elements may also operate on a skewed axis angle to rotationally offset the vibration pattern to affect active torquing of the gyroscope. Skewed drive elements may be combined with skewed or split elements on the same device. The skewed sensing scheme may be applied to vibratory systems having one or more node axes. The skewed drive scheme may be applied to vibratory systems having two or more node axes to affect active torquing.

The invention allows orientation of the platform (1) in order to obtain conditions of maximum efficiency in the wind turbine (16). It comprises first sensors (8) for detecting an effective rotation axis angle (δ) formed between the rotation axis (2) and a horizontal plane (24); second sensors (9) for detecting wind direction (23); platform orientation means (11) for modifying the effective rotation axis angle (δ); and at least one control unit (12) adapted for receiving a first input (13) from the first sensors (8) and a second input (14) from the second sensors (9) and, based on said inputs (13, 14), transmitting orders to the platform orientation means (11) and yaw mechanism.

An input device includes a main body and a motion sensor unit. The main body has a longitudinal axis. The motion sensor unit is configured and arranged to detect rotation of the main body about the longitudinal axis. The motion sensor unit has an X-axis angular velocity sensor configured and arranged to detect an angular velocity of the main body about an X-axis in a three-dimensional orthogonal coordinate system defined by the X-axis, a Y-axis and a Z-axis. The X-axis coincides with the longitudinal axis of the main body and the Y-axis and the Z-axis being orthogonal to each other in a first plane perpendicular to the X-axis.

A control apparatus for an induction motor is provided and includes a rotating-speed locked loop and a feed-forward magnetizing-axis angular position emulator. The rotating-speed locked loop emulates a speed control loop of the induction motor for producing an emulated torque current and an emulated rotor angular speed. The feed-forward magnetizing-axis angular position emulator receives the emulated torque current and the emulated rotor angular speed for producing a feed-forward estimated magnetizing-axis angular position, wherein according to the feed-forward estimated magnetizing-axis angular position, a first voltage controlling the induction motor is transformed from a synchronous reference coordinate system of the induction motor to a static reference coordinate system of the induction motor, and a two-phase current detected from the induction motor is transformed from the static reference coordinate system to the synchronous reference coordinate system. The state the stator angular frequency is at zero can be skipped through the apparatus.

The invention discloses a non-similar dual-redundancy integrated navigation device applied to an unmanned plane, comprising main and standby combined navigation systems and a difference data transmission radio, wherein a laser strapdown inertia-satellite combined navigation system is adopted as the main combined navigation system which comprises a laser strapdown inertia navigation part and a satellite receiver; an optical fiber strapdown inertia-satellite combined navigation system is adopted as the standby combined navigation system which comprises an optical fiber strapdown inertia navigation part and a satellite receiver; the satellite receivers are both used for receiving GPS difference information, carrying out difference correction resolving and outputting satellite positioning information; the strapdown inertia navigation parts are both used for receiving atmosphere information and control commands and simultaneously outputting navigation information; the main and standby combination navigation systems transmit respectively received atmosphere information and satellite positioning information via serial interfaces. The device has the advantages of high reliability, good maintenance and lowering of requirements on a power supply caused by volume, weight and cost, providing of plane shaft angular rate information, high navigation precision and practicability.

The invention relates to a double speed axial angle digital converter that uses DSP as central process unit. The process includes the following steps: the excitation signal of rotating transformer accessing to DSP through synchronizing signal generating circuit, and the rotating transformer signal of raw and fined channels accessing to DSP through signal adjusting circuit, the DSP first gaining compounding axial angle location and speed, and realizing digital quantity output through interface circuit after taking angle error correction and combining, the random dither signal generated by DSP would be accessed to signal adjusting circuit through filtering circuit and rotating transformer. The speed ratio and converting accuracy could be adjusted. The whole converting process could be realized by software arithmetic. Thus, it could not only reduce hardware circuit, lower cost, but also could adjust diameter by software and improve adaptability.

The invention provides an open-loop control method for the rotation speed change of reaction wheels (hereinafter referred to as flywheels) and an unloading method. The open-loop control method for the rotation speed change of the reaction wheels and the unloading method comprise the following specific steps that 1, controlling is conducted through the four flywheels, and the instruction of the magnitude of the reaction wheel control torque of the fourth flywheel is adjusted to be consistent with the magnitude of the theoretical nominal rotation speed friction torque; 2, a control instruction output by a controller is limited within the maximum output torque, the control torque of each flywheel is distributed according to a flywheel distribution matrix, after the control torque of each flywheel is distributed, the flywheel with the maximum output torque is limited within the maximum torque, and the control torque of the other two flywheels is decreased and increased proportionally; 3, the momentum of a synthetic angle of the four flywheels is calculated, and when any axial angle momentum reaches the unloading threshold range and the relationship between the magnetic field intensity and an angular momentum included angle during unloading is met, magnetic torquers are started to be uninstalled; and 4, the magnetic torquer with the maximum unloading capacity is selected to work, and the flywheels are unloaded by adopting a switch control mode.

An internal gear shaving machine 1 which brings a shaving cutter 3 and an internal gear held by a workpiece chuck 2 into engagement with a crossed axes angle, and subjects the tooth flanks of the internal gear to final machining while it rotationally drives at least one of the shaving cutter 3 and the workpiece chuck 2. The workpiece chuck 2 and shaving cutter 3 are supported movably toward and away from each other in a vertical direction with the workpiece chuck 2 higher and supported movably in the horizontal direction relative to each other. The workpiece chuck 3 is constituted to hold the outer circumferential surface of the internal gear with the axis of rotation of the internal gear oriented in a up-down direction so that shavings produced during processing by the shaving cutter can fall downwardly from the internal gear.

The invention relates to an unmanned aerial vehicle-based guided missile attack route planning method which comprises the following steps: calculating to obtain the wind speed and the wind direction according to fight parameters of an unmanned aerial vehicle, and determining the sun illumination azimuth angle according to local time; calculating track angles of the unmanned aerial vehicle attacked by guided missiles from the left side and the right side according to the wind speed and the wind direction, and selecting the side having the relatively small absolute value of the difference value between the track angle of the unmanned aerial vehicle and the sun illumination azimuth angle to be used as the side suitable for being attacked by the guided missiles; determining the launching off-axis angles and launching axial distances of the guided missiles according to launching requirements and trajectories of the guided missiles so as to obtain the laterodeviation of the unmanned aerial vehicle; and calculating to obtain the coordinate of laterodeviation point stroke according to the track angle, at the side suitable to be attacked by the guided missiles, of the unmanned aerial vehicle, the laterodeviation of the unmanned aerial vehicle, and known impact point coordinates and further to obtain the attack route of the guided missiles, so that the unmanned aerial vehicle flies for attacking according to the attack route. According to the unmanned aerial vehicle-based guided missile attack route planning method, use requirements of all-weather attack of the unmanned aerial vehicle are met, and the automation degree, the rapidity and the real-time performance of the attack can be improved to the greatest extent.

The present invention relates to a z-axial solid-state gyroscope. Its main configuration is manufactured with a conductive material and includes two sets of a proof mass and two driver bodies suspended between two plates by an elastic beam assembly. Both surfaces of the driver bodies and the proof masses respectively include a number of grooves respectively perpendicular to a first axis and a second axis. The surfaces of the driver bodies and the proof masses and the corresponding stripe electrodes of the plates thereof are respectively formed a driving capacitors and a sensing capacitors. The driving capacitor drives the proof masses to vibrate in the opposite direction along the first axis. If a z-axial angular velocity input, a Coriolis force makes the two masses vibrate in the opposite direction along the second axis. If a second axial acceleration input, a specific force makes the two masses move in the same direction along the second axis. Both inertial forces make the sensing capacitances change. Two z-axial solid-state gyroscopes and two in-plane axial gyroscopes can be designed on a single chip to form a complete three-axis inertial measurement unit.

A theoretical expression of a workpiece (W) the curved surface of which is measured by a measuring probe (110) equipped with a stylus (111) is specified, a measuring area where the measurement is executed on the measuring surface of the workpiece (W) is determined, and the axis angles of the stylus (111) are determined based on the coordinate values and the normal vector of a representative point determined in the measuring area.

The invention discloses a three-axis miniature pan-tilt and its control method. The miniature pan-tilt includes a roll axis assembly, a pitch axis assembly and a yaw axis assembly, and is characterized in that the roll axis assembly, the pitch axis assembly and the The yaw axis components are respectively equipped with micro DC motors and IMU sensors for collecting the angular velocity and acceleration of each axis. The three micro DC motors and the three IMU sensors are respectively electrically connected to the processing circuit device; the control method is through the processing circuit The microprocessor of the board receives the three-axis angular velocity and acceleration data collected by the three IMU sensors in real time, so as to control the rotation of the micro DC motor on the roll axis assembly and the pitch axis assembly in real time. The three-axis miniature pan / tilt of the present invention is small in size, realizes miniaturization, can be mounted on a miniature unmanned aerial vehicle or a pocket unmanned aerial vehicle, provides clear and stable video images for users, and its control mode is simple at the same time.

The invention belongs to the technical field of high-quality and high-efficiency milling of complex curved surface parts, and relates to a global optimization method for a cutter-axis vector based onthe minimum angular acceleration of a machine tool rotating shaft. The method comprises the steps of generating a cutter track by using an equal residual height method according to the curved surfaceand cutter characteristics; establishing an inverse kinematics relation of a five-axis machine tool; converting the cutter-axis vector under the workpiece coordinate system into a rotation angle valueof rotary feeding shaft of the machine tool, calculating the angular speed and the angular acceleration of the rotary feeding shaft of the machine tool by using a finite difference method; calculating a feasible space of the cutter axis at the position of a cutter contact point by means of a C space method according to an interference judgment criterion, judging the concavity and convexity of a cutter path curve, and determining a key cutter-axis vector on the cutter path curve; and optimizing the cutter-axis vector by taking the minimum angular acceleration in each interval as an objective.The method can effectively reduce the angular acceleration of the rotary feeding shaft of the machine tool in the machining process, realize the stability of the machining process, improve the surfacemachining quality and reduce the machining contour error.

In an axis angle determination method, an angle or a position of each axis of a six-axis robot is determined. The robot is capable of taking an attitude of a singular point being a state in which rotation axes of fourth and sixth axes match. Based on teaching results of a position and attitude of a hand by point-to-point teaching, the method judges whether an attitude of the robot in which the angle or the position of each angle is to be determined next is a singular point. If judged that the attitude is the singular point, angles of the fourth and sixth axes required for the six-axis robot to move to the singular point are determined such that an angle of one of the fourth and sixth axes is fixed to a current value and an angle of the other axis is determined based on the fixed angle.