56results about How to "Eliminate degrees of freedom" patented technology

Improved camera calibration techniques, including an improved up look angle and an improved method for calibrating a virtual center of projection. By using a view camera technique for the up look angle, the image sensors can be mounted flat to a Printed Circuit Board (PCB). By using a sub-region of the image sensor for the active area of the camera it is possible to calibrate the virtual center of projection (C′).

Improved camera calibration techniques, including an improved up look angle and an improved method for calibrating a virtual center of projection. By using a view camera technique for the up look angle, the image sensors can be mounted flat to a Printed Circuit Board (PCB). By using a sub-region of the image sensor for the active area of the camera it is possible to calibrate the virtual center of projection (C′).

A bistatic radar system having a transmitter that generates unique signals at spatially independent transmitter degrees of freedom and a receiver that filters the signal at each receiver degree of freedom into a group of signals identical in number to the number of transmitter degrees of freedom. The receiver formats the filtered signals into a 2-dimensional array of elements. The receiver rotates the array so that the new axes are aligned with the Doppler gradient. The data is then re-sampled and projected to linearize the clutter signal. The receiver may be integrated with a broad class of adaptive and non-adaptive clutter mitigation approaches such as electronic clutter tuning and projected bistatic space-time adaptive processing, or STAP.

The invention relates to a helicopter rotor system elastic bearing load measuring device. The helicopter rotor system elastic bearing load measuring device comprises a measurement base, an X axis direction testing mechanism, a Y axis direction bending testing mechanism, a Z axis direction bending testing mechanism, an alignment locking mechanism and a torsion testing mechanism in the X axis direction. The measurement base is composed of a detecting platform base, a rotating shaft and a bearing large-end clamp and arranged at the bottom of the helicopter rotor system elastic bearing load measuring device. The X axis direction testing mechanism is arranged on the top of the helicopter rotor system elastic bearing load measuring device, and the torsion testing mechanism in the X axis direction, the alignment locking mechanism, the Y axis direction bending testing mechanism and the Z axis bending testing mechanism are correspondingly arranged on the lower layer, the middle layer and the upper layer of the helicopter rotor system elastic bearing load measuring device in sequence from bottom to top along the axis lead in the X direction. Through the helicopter rotor system elastic bearing load measuring device, the rigidity characteristic detection on different models of helicopter rotor system elastic bearings can be performed on one detecting platform, and university is good. The detecting efficiency and the safety of personnel in the detecting process are improved, the detecting strength is reduced, the elastic bearings can be clamped on one detecting platform at a time, and force (torque) in multi-dimensional directions can be loaded and measured.

A head protecting frame used for prone position operations and capable of preventing pressure ulcers comprises a head support frame, a mirror surface base, a face gel combined support pillow and a lifting adjusting device, wherein a pillow interior storage cavity is defined by a head top limiting flange, face limiting flanges, a lower jaw limiting flange and the bottom of the head support frame; a lower jaw avoiding notch is formed in the center of the lower jaw limiting flange, a five-sense-organ part avoiding opening is formed in the bottom of the pillow interior storage cavity, and an inner limiting flange is arranged on the periphery of the five-sense-organ part avoiding opening; the face gel combined support pillow comprises a sponge support die support and a gel face contact layer, and a five-sense-organ avoiding notch is formed in the face gel combined support pillow; the face gel combined support pillow is mounted in the pillow interior storage cavity, the mirror surface base is arranged below the head support frame, and the head support frame and the bottom mirror surface are integrally connected through the lifting adjusting device. The head protecting frame not only can protect the face of a patient from extrusion to facilitate observation of a doctor, but also can be adjusted freely in height, and the best operation position of the patient is guaranteed.

A structure system capable of achieving double-point hanging conversion and separation for a parachute includes a connection and separation mechanism (4), hanging slings (3), main parachute separationdevices (2), and dampers (1). Through reasonable configuration with a drag parachute cluster parachute system and a main parachute cluster parachute system, and under driving of an initiating explosive device, connection and separation of a drag parachute can be completed in a normal working mode, a main parachute bag is pulled out, connection and hanging conversion of a main parachute cluster parachute are performed, a heat-proof layer is pulled off, impact overload of the hanging conversion is reduced, and unlocking separation of the main parachute cluster parachute is completed; in addition, self-adaption of a work mode of single drag parachute failure of the drag parachute cluster parachute system can also be completed; under judgment of a control program, work modes of landing on water and ground are selected by the initiating explosive device; and a redundant unlocking device for the drag parachute enables the reliability to be improved. The system has the characteristics of large carrying capacity, multiple work modes, high reliability, and the like, and can be widely applied to occasions of connection and separation of cluster parachutes.

A wearable motion tracking system (12) for capturing a relative position between a first body part (101) and a second body part (103) of said user (100) comprising a first measurement device (120a), a second measurement device (121a) and a computing device (150) that are configured such as to obtain by said computing device (150) a plurality of measurements between said first and second measurement devices (120a, 121a). Based on the plurality of measurements that comprises at least one distance measurement between said first and second measurement devices (120a, 121a) said computing device (150) is configured to compute, in three dimensions, a position of said second measurement device (121a) relative to said first measurement device (120a) for tracking the position of said second body part (103) relative to said first body part (101). The present invention further relates to a method of motion tracking.

A zipper guide is provided to facilitate closure of an open-ended zipper. The zipper guide includes a base to which a zipper tape pin end is attached and a slider to which a zipper tape box end is attached. A key on a lower surface of the slider slides in a trench in an upper surface of the base at an orientation that guides the attached zipper tape box end toward the attached zipper tape pin end by planar sliding movements of the slider lower surface with respect to the base upper surface.

A zipper guide is provided to facilitate closure of an open-ended zipper. The zipper guide includes a base to which a zipper tape pin end is attached and a slider to which a zipper tape box end is attached. A key on a lower surface of the slider slides in a trench in an upper surface of the base at an orientation that guides the attached zipper tape box end toward the attached zipper tape pin end by planar sliding movements of the slider lower surface with respect to the base upper surface.

The invention provides a valve bracket mounting structure, a valve bracket and an air conditioner outdoor unit. The valve bracket mounting structure is used for fixedly mounting the valve bracket to a chassis of the air conditioner outdoor unit and comprises constraining structures which are matched with each other and separately arranged on the chassis and the valve bracket. In the matched status, the constraining structures constrain movement of the valve bracket relative to the chassis so as to prevent overturning of the valve bracket. By adoption of the valve bracket mounting structure, the problem that the valve bracket is prone to overturning in the fixing and mounting process can be effectively solved, and the mounting efficiency is improved accordingly.

The invention discloses a slipper type 3D printer with parallel connecting rods and a movable platform, and belongs to the technical field of digital machining. The invention aims to solve the problems that a current 3D printer adopts a fixed platform, and a printing heat is driven by a stepping motor to move; this way is restricted by the wire speed of an extrusion head and the movement speed ofthe printing head, and accordingly wiredrawing phenomena frequently occur, resulting in high partial surface roughness of printed parts and influence on the printing quality. A printing platform is driven to move by the stepping motor through three groups of parallel connecting rods, and meanwhile the printing head is fixed; and the above problems are avoided, and the problem of the printing quality due to wiredrawing is solved.

An apparatus and method for locking a detonating cord against a shaped charge.

The invention provides a barrier fixing device of vehicle collision test, and relates to vehicle collision test. The barrier fixing device comprises a collision wall, barrier connecting pieces, a collision barrier and fixing pieces, wherein the collision wall includes multiple grooves; the barrier connecting pieces can be maintained in the grooves selectively and move along the grooves; the collision barrier is used for offset or angular collision and connected with the barrier connecting pieces; and the fixing pieces can be connected with the barrier connecting pieces, and fit to the sidewall of the collision wall at one end of the grooves to prevent the barrier connecting pieces from moving in the grooves. The movement degree of freedom of the barrier connecting pieces along the groove direction is reduced by the fixing pieces, the barrier connecting pieces are prevented from moving along the groove direction, and the problem that the collision barrier connected with the barrier connecting pieces moves in the collision process is solved fundamentally.

The invention belongs to a constant-speed valve and relates to a single-stage constant-speed valve used for a high-pressure kerosene constant-speed hydraulic motor, in particular to a high-reliability integrated large-flow single-stage constant-speed valve used for a constant-speed hydraulic motor driven by high-pressure kerosene. The single-stage constant-speed valve comprises a valve shell, a throttle valve and a compensation valve. The throttle valve is fixed in a cavity inside the valve shell. The compensation valve is fixed in the other cavity inside the valve shell. In the valve shell, an outlet of the cavity where the throttle valve is located communicates with an inlet of the cavity where the compensation valve is located. A damping hole is formed in the valve shell and enables an inlet of the cavity where the throttle valve is located to communicate with the cavity where the compensation valve is located. The single-stage constant-speed valve is simple in structure, high in reliability, low in machining cost, easy to assemble and adjust, high in integration level, capable of fixing and controlling the steady state rotation speed difference, and easy to operate.

One embodiment of present invention is a segmented instrument having braking capabilities that includes an elongate body having a plurality of links and a hinge connecting a pair of adjacent links in the plurality of links. There is also brake assembly coupled to each link in the pair of adjacent links and positioned to span the distance between the pair of adjacent links. Another embodiment of the present invention is a segmented instrument having a plurality of links and at least one lockable and articulatable joint positioned to connect a pair of adjacent links in the plurality of links. In addition, the at least one lockable and articulatable joint is adapted and configured to increase the number of frictional surfaces available between the pair of adjacent links. There are also provided methods for controlling a segmented instrument. Exemplary steps of the method include introducing a segmented instrument into a patient where the segmented instrument has a plurality of links wherein adjacent links are joined by a hinge. Next, there is the step of manipulating the links about the hinges to maneuver the segmented instrument to provide access to a surgical site within the patient. In one aspect, the manipulating step produces a sliding motion between a plurality of complementary shaped components within a portion of a brake assembly between adjacent links. Next there is the step of actuating the brake assembly to substantially prevent movement about the hinge of the links attached to the braking mechanism.