632 results about "Medial axis" patented technology

A measuring device for providing data corresponding to a geometric configuration in space, in the form of a flexible, compliant, measurement member capable of bending in at least one degree of freedom and extending along a medial axis or plane. The member has spaced flexure sensors distributed at known locations on the member and separated by known sensor spacing intervals to provide flexure signals indicating the local state of flexure present at the locations. The member comprises a multiplicity of formed, i.e. shaped, fibers, these fibers including sensing fibers having sensing portions which provide the flexure sensors, the sensing portions of different fibers being located at differing distances along the member so as to be located at the sensor spacing intervals, the formed fibers being in mutually supporting relationship, as by continuous or repeated contact with each other. Such fibers may constitute most or all of the member.

A test probe consists of an elongated screw machine contact biased by a helical spring and mounted in a through hole of a non-conductive substrate. One end of the contact includes a crown for engaging a solder ball lead of an IC package, and the contact includes an intermediate collar which maintains the contact within the through hole. The helical spring is disposed about the contact, with one end thereof engaging the lower end of the collar. The other end of the helical spring has contiguous coils and is of a reduced diameter so as to extend beyond the lower end of the non-conductive substrate to make electrical contact with a printed circuit board. When the test probe is compressed between the IC package and the printed circuit board, the inherent twisting of the helical spring causes the contact to tilt and make electrical contact with the contiguous coils, thereby establishing a direct electrical path between the IC package and the printed circuit board, with minimum resistance and minimum inductance. In an alternate embodiment, each probe is disposed within a dielectric housing which, in turn, is disposed in a through hole in a conductive substrate to effectively shield the probe from electrical interference.

A method is disclosed for laser net shape manufacturing a part or repairing an area of a part comprising providing a CAD model of the part to be manufactured or repaired, digitally slicing the CAD model into a plurality of deposition layers, determining a medial axis for each of the deposition layers of the part or repair area; and depositing a bead of a material in a pattern centered upon the medial axis of each of the deposition layers so as to build-up the material by each of the deposition layer until the part is manufactured or repaired.

A system and a method automate metrology, measurement, and model correction of a three dimensional (3D) model for 3D printability. Slices of the 3D model are received or generated. The slices represent 2D solids of the 3D model to be printed in corresponding print layers. Medial axis transforms of the slices are calculated. The medial axis transforms represent the slices in terms of corresponding medial axes. A local feature size at any point along a boundary of the slices is determined as the shortest distance from the point to a corresponding medial axis.

Embodiments disclosed herein provide systems and methods for preparing geometry for 3D printing. In one embodiment, a 3D printing preparation application receives 3D geometry and repairs non-manifold edges and non-manifold vertices, producing a topological manifold geometry. The 3D printing preparation application then welds coincident edges without coincident faces and fills holes in the geometry. The 3D printing preparation application may further perform resolution-aware thickening of the geometry by estimating distances to a medial axis based on distances to distance field shocks, and advecting the distance field using a velocity field. A similar approach may be used to perform resolution-aware separation enforcement. Alternatively, one component may be globally thickened and subtracted from another for separation enforcement. The 3D printing preparation application may also split large models and add connectors for connecting the split pieces after printing. In addition, the 3D printing preparation application may generate a 3D print preview.

Methods and systems for modeling objects and object image data using medial atoms are disclosed. Objects and object image data can be modeled using medial atoms. Each medial atom includes at least two vectors having a common tail and extending towards an implied boundary of a model. The medial atoms may be aligned along one or more medial axes in the model. The model may include multiple sub-components, referred to as figures. The model and each of its figures may be represented in model-based and figure-based coordinates. The model may be automatically deformed into target image data using a hierarchy of geometric or probabilistic transformations.

The invention discloses a method for positioning and tracking outer contour feature points of key face organs and a device thereof, comprising the following steps: first, the positions of canthi points and angulus oris points on the face are obtained; the medial axis of the eyes and the mouth is identified based on the positions; the outer contour feature points of the eyes and eyebrows are identified on the medial axis of the eyes, and the outer contour feature points of the mouth are identified on the medial axis of the mouth. Consistent positioning and tracking of outer contour feature points of key face organs are conducted on such a basis. The technical proposal provided by the embodiment of the invention solves the problem of inaccurate positioning of outer contour feature points of eyes, mouth and eyebrows when people makes various faces; based on the positioning of the feature points, the existing two-dimensional and three-dimensional face models can be real-time driven, and face expressions and motions such as frowning, blinking and mouth opening of people before a camera can be real-time simulated, thus creating various real and vivid face animations.

An electromagnetic active control device for longitudinal vibration of a marine shafting, belonging to the technical field of oceanographic engineering, comprises: an acceleration transducer, a tachometer, a signal analysis and control module, a power amplifier and an electromagnetic actuator, wherein the acceleration transducer and the tachometer are respectively located on a thrust bearing base and a middle shaft and output a measured vibration acceleration electric signal of the base and a photoelectric signal of the shafting to the signal analysis and control module; the signal analysis and control module receives the vibration acceleration electric signal and the photoelectric signal, performs spectrum analysis and characteristic signal extraction on the received signals to generate corresponding action control signals, and outputs the action control signals to the power amplifier for amplification; and the electromagnetic actuator is arranged on the middle shaft and receives the amplified control signals to generate a corresponding longitudinal actuation force applied on the middle shaft, thereby implementing the control for the longitudinal vibration of the shafting. The electromagnetic active control device for longitudinal vibration of the marine shafting effectively reduces the longitudinal vibration of the shafting, so that vibration response of a marine structure is reduced finally, and the control device not only is effective to low frequency line spectra, but also has excellent control effect on broadband random excitation.

The invention discloses an installation method of ship single shafting without setting a front bearing of a stern shaft tube, mainly comprising the following steps of: determining the position of a boring hole of a bearing installing hole by using a tail datum point and a head datum point on a shafting central line as datum and adopting an illumination method; positioning a middle bearing by using the central point of a bearing installing hole at the front end of the stern shaft tube and the central point of the bearing installing hole at the back end as the datum and adopting the illumination method; and hoisting a stern shaft, a central shaft and a main machine and then connecting the central shaft with the stern shaft into single shafting. The invention initially positions the central bearing through adopting the illumination method twice to ensure that the installation precision of the ship single shafting without setting the front bearing of the stern shaft tube is effectively controlled, and can enhance the installation efficiency, ensure the installation precision of the shafting and accord with the requirements of the ship design, and the shafting installed by the installation method can run more stably so as to ensure the using safety of the bearing and the main machine.

The present invention relates to an outline font. The purpose lies in supplying a transforming and rendering method in the shape where the important form of the shape, such as the thickness of the stroke, will be maintained from the basic shape, and at the same time the whole size of the shape can be fitted into a given bounding box. The present invention supplies the transformation method of a handwriting font including searching for the medial axis of a given element, obtaining contact points by using maximal inscribed circles with the medial axis and points of the medial axis as a center, and applying the information about the medial axis points and the contact points in case of a transformation of the element in the transformation method of handwriting where a given element can be optionally transformed in sizes in order to achieve the purpose. The present invention enables the transformation of the shape. In resizing the given element from the box surrounding element to the box where the new element is placed, the important form of the shape, such as the thickness of the stroke, is maintained, and at the same time the size of the whole is transformed in accordance with the optionally given box.

A coupling structure of a variable length shaft, comprises a pipe member having an end formed with a plurality of slits elongated in the axial direction to be capable of expanding and diminishing in diameter, an intermediate shaft spline-fitted in the end of the pipe member, and a ring member fitted on an outer periphery of the end of the pipe member, the intermediate shaft being fastened by the end of the pipe member. A holder is releasably attached to an end of the ring member to expand a diameter thereof and thereby reduce a slide frictional resistance of the pipe member against the intermediate shaft. When the holder is released, the ring member diminishes in diameter, and a fastening force of the pipe member on the intermediate shaft is increased.

An apparatus for carry out a method of diagnosing abnormality of a reduction gear, the reduction gear including an intermediate shaft element disposed between an input shaft and an output shaft and rotating in proportion to a rotation of the input shaft to transmit the rotation to the output shaft, the apparatus has: a disturbance observer that obtains an estimated disturbance value regarding the reduction gear, based on a torque instruction and a velocity feedback-value acquired when a pair of driven members which rotate relative to each other with a motor as a driving source are in relative rotation at a constant velocity; a specific spectral component specifying portion for extracting a specific spectral component corresponding to a constant multiple of a rotational frequency of the intermediate shaft element from a frequency components of the estimated disturbance value obtained by frequency analysis; and a diagnosing portion, which compares an amplitude of the specific spectral component specified by the specific spectral component specifying portion with a threshold value, and diagnoses an abnormality in a case where the amplitude of the specific spectral component exceeds the threshold value, or a normality in a case where the amplitude of the specific spectral component is equal to or less than the threshold value.

The invention provides a digital control ultrasonic processing device for a common lathe. The device comprises a pedestal, an intermediate guide rail, an upper support plate and a rotary tool rest, wherein the bottom surface of the pedestal is provided with a dovetail groove; the intermediate guide rail is arranged on the pedestal through a vertical guide rail; the upper support plate is arranged on the intermediate guide rail through a horizontal guide rail; an intermediate shaft is arranged inside the upper support plate; the rotary tool rest is arranged on the intermediate shaft; a patch panel and an electric brush panel are arranged between the rotary tool rest and the upper support plate; an electric brush is connected between the patch panel and the electric brush panel; a lead screw feeding mechanism is arranged on the intermediate guide rail and the upper support plate; a tool rest automatic tool change mechanism is arranged between the upper support plate and the rotary tool rest; a lathe tool, a round amplitude transformer and an external circular amplitude transformer are arranged on the rotary tool rest; and a processing tool bit is arranged on the two amplitude transformers and connected with an energy converter respectively. The digital control ultrasonic processing device for the common lathe has high efficiency and high processing precision and can complete turning, ultrasonic processing of the external circular face and ultrasonic processing of the crown face by clamping for one time.

A rotatable cutting tool carried in a bore of a holder wherein the holder has a forward surface surrounding a forward end of the bore. The rotatable cutting tool includes an elongate cutting tool body that has a central longitudinal axis, an axial forward end and an axial rearward end. The cutting tool body contains a socket in the axial forward end thereof whereby the socket receives a hard insert therein. The cutting tool body has an enlarged diameter collar mediate of the axial forward end and the axial rearward end. The mediate collar presents an axial forward facing surface and an axial rearward facing surface. The cutting tool body has an axial forward hardness region beginning at and extending a first pre-selected distance in an axial rearward direction from the axial forward end to encompass the axial forward facing surface of the collar. The axial forward hardness region has a hardness equal to or greater than a first hardness, as well as a first average hardness. The cutting tool body has an axial rearward hardness region beginning at and extending a second pre-selected distance in an axial forward direction from the axial rearward end to encompass an axial rearward section of the shank portion. The axial rearward hardness region has a third average hardness. The cutting tool body has a transition hardness region mediate of and contiguous with the axial forward hardness region and the axial rearward hardness region. The transition hardness region encompasses the axial rearward facing surface of the collar and an axial forward section of the shank portion. The transition hardness region has a second average hardness. The second average hardness is less than the first hardness, and the third average hardness is less than the second average hardness.

Contemplated couplings include an intermediate shaft internal and coaxial to a driver and a driven shaft, wherein the intermediate shaft moves a plurality of teethed rollers that engage with corresponding splined inner surfaces of the driver and the driven shaft. Such devices allow separation of the shafts under load using substantially reduced force and will typically have a friction coefficient virtual μ of less than 0.05.

The invention relates to a method for improving a shaft system centering process for ship building. The method comprises the following steps of: boring holes on a screw shaft flange, a middle screw shaft flange, a middle shaft front flange and a host machine output end flange; adjusting the tortuosity and deviation of the screw shaft flange and the middle screw shaft flange and the tortuosity and deviation of the middle shaft front flange and the host machine output end flange; and connecting the host machine output end flange and the middle shaft front flange and connecting the middle screw shaft flange and the screw shaft flange through bolts, and the like. The method of the invention has the advantages of greatly shortening the working time of the shaft system after a ship is undocked, lowering the pressure of a dock mooring test and contributing to shortening the mooring test period of a dock of a company.

The present invention provides a secondary retarding mechanism of an electric tool, wherein the retarding mechanism is used to retard the output revolution speed of the motor and output it to the main shaft, an axial thrust is acted on an intermediate shaft through the mesh of a beveled wheel so that the intermediate shaft vibrates along the axial direction to produce noises. The object of the present invention is to restrain the intermediate shaft vibration and noise of a portable fretsaw with a secondary retarding mechanism adopting beveled wheels. The secondary retarding mechanism has the following structure that an intermediate shaft can be supported in a mode of moving along the axial direction, the teeth directions of two beveled wheels supporting the intermediate shaft are identical, accordingly a forward axial thrust is acted on the intermediate shaft, the axial thrust is configured to bear by a buffering component on the front side of the intermediate shaft to absorb the vibration.

There is disclosed a graphic processing method in which a first figure skeleton apart from an outline of a figure by each equal distance in a central direction of the figure is calculated using at least one of a medial axis and a chordal axis with respect to a figure representing the outline of the object shape reflected in a digital image by a set of points, branch lines to the skeleton from a vertex of the figure in the calculated first figure skeleton are removed to obtain a second figure skeleton, and a curve coordinate system is defined using the second figure skeleton as one coordinate axis and using a distance between the second figure skeleton and the outline of the figure as the other coordinate axis with respect to data obtained by one circulation of the outline of the figure using one end point of the second figure skeleton as a start point and using the other end point as a terminal point to transform the coordinate of points on the outline of the figure into the other coordinate axis of the curve coordinate system.

In a gear case of a throttle body, a valve gear is fixed to one end of a throttle shaft, an intermediate reduction gear is rotatable around an intermediate shaft, a pinion gear is fixed to a motor shaft of a drive motor, and a full close position stopper is provided for defining the full close position of a throttle valve. Those are provided all in alignment with the longitudinal centerline of the gear case. For car models where the throttle body bore inside diameter is identical but the rotation direction of the drive motor differs, only some components in the gear case need be replaced and the other components in the gear case can be used as common components.

The invention discloses a parallel mechanism having a reconfigurable characteristic. The parallel mechanism comprises a base component, first, second and third branch chain components, lower shafts of the first, second and third branch chains, middle shafts of the first, second and third branch chains, a middle platform component and a tail end platform component, wherein a bearing seat at the rear end of the lower part of the first branch chain is connected with a first base slider bearing seat on the base component through the lower shaft of the first branch chain; the bearing seat at the front end of the lower part of the first branch chain is connected with a first middle platform bearing seat of the middle platform component through the middle shaft of the first branch chain; an end cover of the upper part of a first spherical hinge of the first branch chain component is connected with a first tail end platform connecting part of the tail end platform component; the second and third branch chain components are totally the same as the first branch chain component; a bevel gear of a base rotates to drive a wing plate screw to rotate so that a rectilinearly-moving slider of the base performs rectilinear motion along linear guide rails of the base; a screw motor rotates to drive a middle rectilinearly-moving screw to rotate, so that a middle rectilinearly-moving slider can move along middle rectilinearly-moving guide rails.

Provides small vehicle drives with reduced axial dimensions without increasing the number of parallel shafts. The first electric motor (M1) and the power distributing mechanism (differential part) (16) are arranged on the first axis (CL1) which is the rotation center of the input rotating member (14) in order from the input rotating member (14), automatically The transmission (transmission unit) (20) is arranged on a second axis (CL2) parallel to the first axis (CL1). The transmission member (18), which is a rotating member located on the first axis (CL1) at the end opposite to the input rotating member (14), and arranged on the second axis at the end opposite to the input rotating member (14) Between the first intermediate shaft (rotating member) (40) on (CL2), a driving connection device (23) is provided to be able to transmit power. In this way, the power transmission path becomes a C-shape or a U-shape with reduced axial dimension, which can reduce the size and simplify the structure without increasing parallel shafts.

The invention discloses an air inlet of an air-breathing pulse detonation engine. The housing of the engine constitutes the circular air inlet, wherein an inlet cone is arranged on the medial axis at the rear end of the air inlet; a cylindrical structure at the rear part of the inlet cone and the housing of the engine constitute a ring-shaped channel; the air flow is fed into a special-shaped channel having a special-shaped structure via the ring-shaped channel; the special-shaped channel is evenly distributed on the circumference of the air inlet with the distance between the central symmetrical curve of the special-shaped channel and the medial axis of the engine remaining unchanged but deviating along the circumference; a fuel channel is arranged on the medial axis of the inlet cone, and the two ends of the fuel channel are connected with the fuel inlet and a fuel injection lever located on the medial axis outside the rear end of the cylindrical structure; the fuel injection lever is particularly a hollow oil tube with one end thereof being closed; a plurality of fuel injection holes are formed on the lateral surface of the fuel injection lever; the housing of the engine and the rear end surface of the cylindrical structure constitute a mixing chamber; and an igniter is located on the lateral wall of the mixing chamber. The invention can improve the atomization and evaporation of the fuel and reduce the impact of reversed fuel on the air inlet.