195 results about "Axis system" patented technology

The present invention is primarily directed to cost-effective systems for using large reflective elements that track the sun on two axes to concentrate solar energy onto a receiver that can convert the sun's optical energy to a form usable for extensive displacement of combustion of fossil fuels. The structures of the tracker frame, tracking mechanism and tracker supports are co-optimized with the optical elements and the receiver for high efficiency, low cost, and ease of assembly, making moderate and large-scale implementations cost-competitive with fossil fuels for peak power, and, with suitable storage, for base-load power and dispatchable peaking power in sunny locations. Improvement to small-tracker two-axis systems and one-axis tracking systems that focus in two dimensions are also included, as are improvements in systems for space-based solar power.

It is a common practice with orthodontists in planning treatment for a patient to prescribe dental changes to cure the malocclusion condition of the patient in terms of mesial or distal, buccal or lingual, and occlusal (coronal) or gingival translational displacements; and facial or lingual torque; mesial or distal angulation and mesial or distal rotation displacements. A method and workstation for measuring the dental displacements, or conversely placing the dental elements in desired positions as per the prescriptions for their displacements in a consistent, reproducible and accurate manner is disclosed. A novel orthogonal curvilinear coordinate system is disclosed that enables the measurement of the tooth displacements in conjunction with the individual tooth axes system.

A method and system are disclosed for finding virtual tooth features on virtual three-dimensional models of the teeth of patients. The tooth features comprise marginal ridges, cusp tips, contact points, central groove and buccal groove. Tooth axes system plays a key role in identifying the tooth features. An iterative method is disclosed for improving the accuracy of the tooth axes system. A virtual three-dimension model preferably obtained by scanning the dentition of a patient forms the basis for determining the tooth features. Tooth features are derived for all categories of teeth including molars, premolars, canines and front teeth. Tooth features are very helpful and used in planning orthodontic treatment. The tooth features are determined automatically using the computerized techniques; and can be manually adjusted when necessary.

An airborne reconnaissance system comprising: (1) Gimbals having at least two degrees of freedom; (2) At least one array of light sensors positioned on the gimbals, for being directed by the same within at least two degrees of freedom; (3) Map storage means for storing at least one Digital Elevation Map of an area of interest, divided into portions; (4) Inertial Navigation System for real-time providing to a gimbals control unit navigation and orientation data of the aircraft with respect to a predefined global axes system;(5) Portion selection unit for selecting, one at a time, another area portion from the area of interest; and (6) servo means for directing the gimbals. The system uses data from the inertial navigation system and from the digital elevation map for real-time calculating direction to selected area portions, and for maintaining the direction during integration of light from the terrain, and for producing corresponding images of area portions.

A satellite laser communication compound axis light tracking device and a control method thereof are disclosed, which are mainly used for satellite laser communication terminal collimation and capture and high precision large scale tracking of a tracking system. The device adopts a compound axis system by combining a coarse tracking system and a fine tracking system, and a control method of the coarse tracking system unloading the fine tracking system. The coarse tracking system adopts a unique rotary biprism structure and has the characteristic of scanning with higher precision in a larger angel range. A capture tracking sensor adopts single CMOS sensor to carry out ternary form window with changeable view field and changeable sampling rate, and a communication tracking detector adopts a 4-quadrant detector. The invention adopts the low bandwidth rotary biprism coarse tracking system and the high bandwidth fine tracking system to carry out dynamic and self-adaptive bandwidth match to realize high dynamic range stable tracking of the compound axis system, thus having extensive application prospect in a satellite laser communication high precision laser link system.

A airborne reconnaissance system comprising: (1) Gimbals having at least two degrees of freedom; (2) At least one array of light sensors positioned on the gimbals, for being directed by the same within at least two degrees of freedom; (3) Map storage means for storing at least one Digital Elevation Map of an area of interest, divided into portions; (4) Inertial Navigation System for real-time providing to a gimbals control unit navigation and orientation data of the aircraft with respect to a predefined global axes system; (5) Portion selection unit for selecting, one at a time, another area portion from the area of interest; and (6) servo means for directing the gimbals. The system uses data from the inertial navigational system and from the digital elevation map for real-time calculating direction to selected area portions, and for maintaining the direction during integration of light from the terrain, and for producing corresponding images of area portions.

The invention discloses an output current wave shape control method for a triphase Active Power Filter (APF). A T-shaped filter and a current wave shape controller are adopted to control the output current wave shape of the triphase AFT. The output filter for each phrase bridge arm of an inverter is a capacity connected to the middle point of two inductances connected with each other in series, and form a T-shaped structure, namely T-shaped filter; the calculation method for wave shape controlling is conducting Alfa, Beta, Omicron transformations to instruction current of the triphase APF, actual output current and the voltage of the power network, so as to realize decoupling of the wave shape controlling of the abc triphase output current; and respectively conducting pole assignment to the single-phrase system under decoupled Alfa, Beta, Omicron axis system, and correcting the error between the APF actual output current an the instruction current, so as to get instruction voltage of each phrase under the alfa, beta, Omicron axis system; and at last sending the instruction voltage to a space vector modulating module, so as to confirm the on-off signal of each bridge arm switch tube, thereby causing the actual output current of the PFA to accurately track the instruction current.

Systems and methods for cooling electronic components that are rotatable about an axis are provided. The system includes a stationary portion, a rotatable portion, and a component cooling system. The stationary portion has a bore there through. The rotatable portion is rotatably coupled to the stationary portion. The rotatable portion includes an imaging detector and an associated electronic component. The component cooling system is positioned at least partially within the stationary portion and configured to channel a curtain of conditioned air to the electronic component.

A two-dimensional field of regard is scanned with a single plane mirror in the object space of a telescope, maintaining a fixed relationship between the rotational direction of scan and the projection of the telescope's focal plane. The two dimensional field of regard is covered by a series of conical arcs, each arc being scanned by rotation at constant angular velocity about the inner axis of the two-axis system. This scanning system accommodates applications such as TDI that require an opto-mechanical scan with a constant linear velocity (magnitude and direction) in the focal plane. Shading of IR images is mitigated by calibration at the ends of each scan line and by a scan geometry that minimizes changes in reflection angle.

An unmanned aerial vehicle mounted light and small-sized self-stabilized flight multispectral imaging system adopts the multi-lens multi-detector light splitting mode and utilizes a management controller to perform synchronous exposure tactics on a detector group to realize simultaneous imaging of the target region in different bands, and image data and flight auxiliary data are packaged and stored by an on-board memory unit; images shot in the target region are transmitted to a ground workstation in real time through a viewer; in addition, a stable control module conducts two-axis system posture adjustment on the azimuth axis and the rolling axis so as to realize vertical or inclined imaging of the system, eliminate plane vibration and perturbance and also avoid influence on the shooting trace from the side flight and rolling of the plane, and the axis of the shooting region is always kept parallel to the trace. The system adopts the light, small and integrated design, is suitable for being built on a light and small-sized unmanned aerial vehicle, can be adaptable to civil fields, such as agriculture and forestry monitoring, water contamination monitoring, smart city planning construction, drug arresting and emergency rescue, and facilitates monitoring of dynamic targets.

A computer implemented method for generating a section cut in a model of a part. A location on the part is identified. An axis system is created at the location in the model of the part, wherein the axis system has an axis that is normal to a surface at the location in the model of the part. Section cuts intersecting the surface and plies below the surface are created. A plurality of sampling points on the surface is identified based on the section cuts. Core sampling is preformed using the plurality of sampling points to generate sampled data.

System and method for developing a motion application. A motion manager component implementing a supervisory control function and at least one trajectory generation algorithm is stored on a motion controller. A first application programming interface (API) for interfacing the motion manager component to a user developed motion control application is displayed. A second API for interfacing the motion manager component to a user developed communication interface component is displayed. A user application executable for sequencing motion operations in the motion system is created using the first API is created in response to user input. A first communication interface component is created using the second API in response to user input, where the communication interface component is operable to interface with the motion manager component using the second API, and where the user developed communication interface component is executable to communicate with a motion element, e.g., a drive or simulation.

The invention relates to a method for calculating rotor dynamics performance of a multi-parallel-axis system. The method comprises the steps specifically as follows: step (1), selecting an analysis object and a calculation type, inputting parameters of a bearing-rotor system, finishing pre-processing operations like discretization of the rotor system; step (2), calling a bearing calculation program, calculating dynamic and static characteristic parameters of each bearing, forming a rotor dynamics equation of a parallel axis system which gives consideration to gear engagement according to the selected analysis object and calculation type; and step (3), calling a solving function to calculate a feature value and a feature vector of a dynamics differential equation, converting the feature value and the feature vector into dynamics characteristic result data through dimension so as to finish calculation and analysis of system stability, critical rotation speed, forced vibration response and vibration mode. According to the method disclosed by the invention, calculation and analysis means for dynamics performance of the multi-parallel-axis system, which can be applied to actual engineering, are developed on the basis of solid theoretical research; the calculated rotor system comprises supports of various types; therefore, combination of bearing calculation and rotor system dynamics analysis is implemented better.

The invention discloses a contour error cross-coupling control method based on interference observation sliding mode variable structure. The method provides a control strategy combining sliding mode variable structure control, a disturbance observer and cross-coupling control and comprises steps of: designing a single-axis servo sliding mode variable structure controller based on disturbance observation; performing stability analysis on a sliding mode variable structure control algorithm based on disturbance observation; designing a cross-coupling controller based on a PID control algorithm; and performing result simulation and analysis. The sliding mode variable structure control based on disturbance observation can eliminate the influence of disturbance, enhancs system robustness and achieves accurate tracking of single-axis motion. The cross-coupling control is configured to eliminate the influence of gain parameters and dynamic mismatch between axes, reduces the contour error to achieve multi-axis coordinated motion. Finally, the effectiveness and superiority of the control method are proved by a two-axis system simulation model, and the tracking error and contour error are effectively compensated.

Position errors of the flat-panel detector in the axes system of the radiation penetration system relative to a necessitated position which remain, for example, after a coarse setup of the radiation penetration system are balanced and thus the accuracy of the radiation penetration system is brought almost randomly close to the accuracy which would have resulted if the flat-panel detector had been exactly adjusted mechanically subsequently by executing a geometrical correction of the radiation penetration raw image, so that a change of a projection of the penetrated object in the radiation penetration raw image due to the position error is reduced or corrected.

The invention relates to an implementation method of automatic gyro drift compensation of a two-axis four-frame photoelectric pod for implementing one-key quick automatic gyro drift compensation of the two-axis four-frame photoelectric pod. The implementation method is characterized by comprising the following steps of: starting the pod for self detection, and then keeping the pod standing; at the moment, keeping collection of the angle between an outer frame and an inner frame of the pod and calculating the angular velocities of the outer frame and the inner frame of the pod relative to the pod; resolving the angular velocities of movement of the optical axes according to the angular velocities of the frames, calculating drift compensation parameters according to the angular velocities of the movement of the optical axes to make the optical axes stable in the inertial space, and when the static stability of the optical axes is less than a threshold value, storing the drift compensation parameters and automatically exiting the automatic drift compensation state. The control method for the automatic gyro drift compensation has the advantages that two axis systems of azimuth and pitching of the photoelectric pod can be simultaneously compensated, the compensation speed is fast, the compensation accuracy is high and one-key drift compensation can be realized.

A system and method for correcting optical distortion in an off-axis system is provided. The offset between the center of a display plane and the optical axis of the projection lens system is configured such that the offset is greater than half the vertical dimension of the display plane. In this manner, the distortion, such as a pincushion-type or barrel-type of distortion, is not symmetrical about the horizontal axis. In this scenario, the display plane, the projection lens system, a folding mirror, and/or the spatial light modulator may be tilted such that a keystone effect is induced. This keystone effect may be used to offset the distortion, particularly the pincushion-type or barrel-type of distortions.