126 results about "Rest frame" patented technology

The present invention provides a pair of arm rest platforms and vertical handles so the user of a rolling walker can have added or alternate support not provided by a conventional rolling walker or rollator. The arm rest platforms are supported at a vertical distance above the conventional walker by providing a pair of arm rest frames each extending between the main frame of the conventional walker and a respective arm rest platform. The arm rest frames each includes an main arm rest frame member carried by the main frame of the conventional walker and an arm rest support member to carry the arm rest platform and vertical handles. The conventional hand brakes can also be relocated; to be operated when gripping the vertical handles. The arm rest platforms can be adjusted in both horizontally and vertically with respect to the main frame of the conventional walker for better distribution of the user's weight.

In a laser scanner for optically scanning and measuring an environment, the scanner having a center which defines for a scan the stationary reference system of the scanner and the center of the scan, a light emitter which emits an emission light beam, a light receiver which receives a reception light beam reflected by an object in the environment of the scanner, a control and evaluation unit which determines, for a multitude of measuring points of the scan, at least the distance between the center of the scan and the object, the scanner, for registering a scene with several scans having different centers, being movable between the centers of the scans, and a scanner mouse for registering the path followed by the scanner between the different centers of the scans, the scanner mouse optically registering the movement of the laser scanner relative to a reference surface.

The invention relates to a fatigue driving detection method and system based on facial feature fusion, and belongs to the technical field of fatigue driving detection. The method comprises the following steps: firstly, carrying out face region positioning on a frame of image in acquired image information through a high-precision face detection algorithm, ensuring the accuracy of face position recognition; dynamically tracking the rest frames of images by taking the positioned face area as a target; obtaining a face area of each frame of image of the driver. On the basis that a high-precision face detection algorithm is not continuously adopted, face position recognition of other frames of images is achieved through a dynamic tracking algorithm with less time consumption, the face positioncan be accurately detected, the judgment accuracy of fatigue driving is improved, and the real-time performance of the detection algorithm can be guaranteed.

Provided is a method for suppressing a circulating current in a modular multi-level converter for a high voltage direction-current (HVDC) transmission system. The HVDC transmission system converts an alternating current (AC) into a direct current (DC) and vice versa, transmits energy using a DC cable, and including a modular multilevel converter generating a high voltage source by stacking a plurality of sub-modules in series. In the circulating current suppression method, a circulating current (idiffj; j=a,b,c) of a,b,c phase in an abc 3-phase stationary reference frame, a DC current (idc) flowing in a DC cable, a current reference value (i*dc) of a DC component that needs to flow in the DC cable are inputted. The circulating current (idiffj) of the a,b,c phase is controlled to become zero. A compensation value (V*diffj) for suppressing a harmonic component of the circulating current is outputted.

The invention provides a head rest apparatus provided with a head rest frame supported to a seat back frame of a seat back via a tilting shaft so as to freely tilt and having an upper side of the tilting shaft to which a head rest is attached, a pressure receiving member provided in a lower side of the tilting shaft in the head rest frame and receiving a load applied from a front surface of the seat back to a backward portion, and an urging member engaging with the seat back frame and the head rest frame and always urging the head rest frame in a backward tilting direction, in which the head rest frame forward tilts around the tilting shaft corresponding to a supporting point and the head rest forward moving when the pressure receiving member is exposed to the load. The urging member is structured such as to urge the head rest frame in the backward tilting direction from a rear portion.

There is provided a seat preventing the baggage or the like from being damaged. A leg rest strain gauge is provided on the bark surface of the leg rest frame on the proximal side. When a baggage is placed in the operating space of the leg rest in the bed position, and the leg rest is moved downward and is abutted against the baggage, the leg rest warps to form a convex on the upper surface in response to a reaction force from the baggage (a force in the direction opposite to the direction of the inclining movement of the leg rest). Therefore, the leg rest strain gauge expands, and thus the resistance and the gauged voltage value exceed the inclining direction determination value and the stoppage determination value. Consequently, the operation of the motor is stopped and the further downward movement of the leg rest is stopped. Therefore, the leg rest is prevented from pressurizing the baggage unnecessarily, thereby preventing the baggage from being damaged.

A wheelchair has a chair, an electrical power device, a foot stand, and a control device. The chair has two arm rest frames, and each arm rest frame has a connection board. The electrical power device is detachably connected with the connection boards and has a holding frame, a driving device, and two rear wheels. The holding frame has two holding boards respectively connected with the connection boards by multiple securing assemblies. Each securing assembly has a holding sleeve, a connecting rod, a knob, and a spring. The holding sleeve has multiple abutting ribs. The connecting rod is mounted through the holding sleeve and has a first end and a second end selectively extending into one of the connecting holes defined in a corresponding connection board. The knob is mounted securely around the second end of the connecting rod and has multiple engaging grooves.

Methods, systems and apparatus are provided for estimating electrical angular speed of a permanent magnet machine based on two-phase stationary reference frame feedback stator current samples, and a dimensionless gain (K) that is computed based on a sampling time (T) and machine parameters.

The invention relates to the technical field of flat screen printing equipment and provides a treadmill flat screen printing machine. The treadmill flat screen printing machine comprises a treadmill frame, wherein running gears are arranged on the two sides of the treadmill frame; a treadmill station positioning device is arranged between the treadmill frame and two guide rails; a tool rest frame is arranged in the treadmill frame; a screen frame is rotationally arranged on the inner side of the tool rest frame; a screen frame positioning device is arranged between the screen frame and the guide rails; a scraper device driven by a scraper driving device is arranged on the tool rest frame in a sliding manner; lifting devices for driving the screen frame and the scraper device to rise or fall are arranged on the two sides of the treadmill frame respectively; the signal output terminal of the treadmill station positioning device is electrically connected with a signal processing unit; the signal output terminal of the signal processing unit is electrically connected with the signal input terminals of the running gears, the lifting devices and the scraper driving device respectively. According to the invention, effective and accurate walking and stopping movements can be realized when the treadmill flat screen printing machine walks between stations, and the screen frame can be accurately positioned on each station, so that the positioning accuracy of the treadmill flat screen printing machine is ensured.

The invention belongs to the field of controlling power converters of wind power generation systems and relates to a deadbeat power control method for a grid-side converter under network voltage unbalance. The deadbeat power control method comprises the steps that three-phase network voltage, a three-phase alternating side current and direct current side voltage of the grid-side converter are detected, a network voltage sampling value and an alternating side current sampling value under a two-phase rest frame through 3 / 2 coordinate transformation, and network voltage retardation is obtained by delaying one fourth of a power grid period of the network voltage sampling value; an active power reference value is calculated, and an alternating side current reference value is calculated and obtained; transformer alternating current side voltage controlled by the deadbeat power is calculated; in order to compensate for time delay in the calculation and control process, the transformer alternating current side voltage at the next moment is predicted and serves as control voltage; a switch signal controlling a power switch component is obtained and is used for controlling on-off sequence and on-off time of the power switch component. According to the deadbeat power control method for the grid-side converter under network voltage unbalance, the grid-side converter can be effectively controlled to have good dynamic and static characteristics under the condition of network voltage unbalance, and reliable grid connection operation of a wind generating set is ensured.

The invention discloses a fractional calculus-based PWM rectifier modeling method, and according to the method, a precise mathematic model of a single-phase PWM rectifier can be established on the basis of a fractional calculus theory and an instantaneous power theory defined by Caputo. The method comprises the following steps: firstly determining a voltage equation and a current equation of the single-phase PWM rectifier in a rest frame; defining and establishing a fractional order inductance equation and a fractional order capacitance equation of the single-phase PWM rectifier, and giving an input instantaneous power equation and an output instantaneous power equation of the single-phase PWM rectifier; and finally giving a direct-current component equation and an alternating-current component equation in an input instantaneous power and an output instantaneous power, and verifying the precision of the fractional calculus-based single-phase PWM rectifier fractional order model established on the basis of numerical simulation. According to the method, the fact that the capacitance and inductance are fractional orders in essence is considered in the modeling process, so that the modeling precision of the single-phase PWM rectifier.

The invention provides a lower limb rehabilitation training elliptical machine device which comprises a device rack, a driving transmission unit, an elliptical trajectory implementation unit and pedal plate connecting units, wherein the device rack comprises an arm-rest frame, a base and vertical plates; the driving transmission unit mainly comprises a drive motor, a small belt wheel, a big belt wheel and a synchronous belt; the elliptical trajectory implementation unit comprises a rotating disc, an elliptical sliding groove, a sliding block, a linear sliding rail and a group of guide wheels; the pedal plate connecting units comprise connecting pieces, pedal plates, flange plates and a bearing. According to the lower limb rehabilitation training elliptical machine device, provided by the invention, a patient is driven to be rehabilitated along the elliptical trajectory, which is more aligned with normal gait of people; besides, as the synchronous belt is in transmission connection with the linear guide rail, and the sliding block is matched with the elliptical sliding groove, the lower limbs can perform rehabilitation training along the elliptical trajectory, the machine device is compact in structure, the mechanism that forms the elliptical trajectory is driven in a single degree-of-freedom manner, and a better lower limb rehabilitation training effect is achieved.

The invention discloses a system and a method for detecting colors of skin. The method comprises the following steps of: taking a plurality of frames of a video as a sample video and performing color space conversion on the first frame of image of the sample video; training a skin color lookup table through collecting sample pictures; for the first frame of image, performing rough skin color detection by means of the skin color lookup table; performing EM clustering on the initial skin color sample which is roughly detected previously so as to establish an initial Gaussian distribution model; performing skin color classification on the second frame of video of the sample video by using the initial Gaussian distribution model, thereby obtaining a new skin color sample; and performing EM clustering on the new skin color sample, thereby updating the initial Gaussian distribution model, and performing the same operations on the rest frames until all frames of the sample video are processed. The system and the method provided by the invention are capable of achieving the purposes of good robustness and high detection accuracy.

The invention discloses a display panel compatible with multiple types of frame sizes and a light-on test method of the display panel. According to the display panel, a group of binding wire lead ends and multiple pieces of short circuit bars are respectively arranged in a display panel area demarcated by each type of frame size, and the size parameters corresponding to the binding wire lead ends of different frame sizes are the same, wherein the short circuit bars are arranged near the frame lines demarcated by different frame sizes; the binding wire lead ends of a location sequence corresponding to each group of binding wire lead ends after being serially connected in sequence are connected with a fan section routing of the display panel; the binding wire lead end corresponding to the largest frame size is directly connected with the corresponding short circuit bar, and the binding wire lead ends corresponding to the rest frame sizes are connected with the corresponding short circuit bars through a switch component. The display panel can be produced by adopting one type of photomask, the cost of the photomask can be lowered, meanwhile the processing time can be shortened, and the production capacity can be increased.

This invention discloses a property test desk for FM variable amplitude car hangers, which fixes two same sets of exciting desks with FM and variable amplitude function at either end of a straight frame oppositely and the axes of two rotation mandrels contained in the exciting desks share one, the function is realized by the frequency adjust device and the amplitude regulation device, the car protection device is fixed on the base located above two vibration rest frames in the vibration maintenance and a guiding unit and below the vibration board, which realizes the active vibration of right and left exciting desks.

A four-wheel drive harvester for garlic comprises a rack, a power assembly is installed on the upper end face of the rack, and a front drive gearbox and a rear drive gearbox are installed in the middle of the rack. A front drive wheel and a rear drive wheel are installed on a power output shaft at the lower end of the front drive gearbox and a power output shaft at the lower end of the rear drive gearbox respectively. An eccentric wheel and a vibration frame are arranged at the rear end of the rack, wherein the eccentric wheel is connected with the vibration frame through a connecting rod. The two sides of the rear end of the vibration frame are respectively provided with a vibration shovel, and depth adjusting bolts are arranged at the connecting positions of handles of the vibration shovels and the vibration frame. An arm-rest frame support base is arranged between the upper side of the front drive gearbox and the upper side of the rear drive gearbox. An arm-rest frame is installed on the arm-rest frame support base, a height adjusting fluted disc is arranged at the connecting position, and a clutch handle and a throttle control handle are arranged on the arm-rest frame. The clutch handle is connected with a tensioning clutch device, and the throttle control handle is connected with the power assembly. Compared with the prior art, the four-wheel drive harvester has the advantages that the structure is compact, four-wheel drive is adopted, power is high, the drive wheels do not slip, operation is flexible, harvesting speed is high, harvesting efficiency is high, and the harvester is suitable for cultivated lands different in soil quality.

The invention discloses a processing technique for heavy crankshaft and shaft part milling frame stations and technique equipment, and belongs to the technical field of machinery manufacture. The processing technique equipment is separated from the supporting of a central frame and the processing of a large tonnage rough turning machine tool, a worm gear and a transmission gear are arranged in a rotating mechanism of the equipment, a motor drives the transmission gear in the rotating mechanism, and an apex is arranged on the inner sides of the rotating mechanism and a jacking mechanism respectively; a workpiece is arranged between the two apexes; a counterweight mechanism consists of a stud bolt, a T-shaped bolt, a counterweight block, a counterweight carcass, a closing bolt, a gland and a top tray; the counterweight block is fixed on the counterweight carcass through the stud bolt and the T-shaped bolt; the counterweight carcass is connected with the top tray through the closing bolt; and the left side of the workpiece is provided with a boring and milling power head, and the lower side and the outer side of the workpiece are provided with slide ways. A finished workpiece is obtained by adopting the tooling equipment and the processes of determining the position of a central hole, drilling the central hole, fixing the workpiece, determining the longitudinal position of the boring and milling power head, determining the transverse position of the boring and milling power head, processing the rest frame stations, checking and warehousing.

At least one example embodiment discloses a drive system including a motor including a rotor, the motor configured to receive a measured current, a controller configured to generate a voltage for the motor at a stationary reference frame, the voltage having a frequency and the measured current being based on the voltage, a filter configured to obtain position information of the rotor based on the measured current and a nonlinear observer configured to estimate a rotor position of the motor during the stationary reference frame based on the position information. The controller is configured to control the motor based at least in part on the estimated rotor position.

The invention relates to the technical field of flat screen printing equipment and provides a scraper device of a treadmill flat screen printing machine. The scraper device comprises a tool rest; two scrapers are arranged in parallel on the inner side of the tool rest; the upper parts of the two scrapers are hinged together through two connecting rods; the two connecting rods are fixedly connected through a cross beam. During a forward stroke, under the driving force of a scraper driving device, a multi-wedge conveyor belt drives the cross beam to drive the two scrapers hinged together through the two connecting rods and the tool rest to slide axially along a polish rod on a tool rest frame, so that the two scrapers can simultaneously carry out printing operation to a piece of fabric; during a return stroke, residual dye is collected to an initial position so as to facilitate a printing operation next time; according to the actual requirements of the printing process, the two scrapers can be controlled to perform secondary scraper printing to a silk screen by adjusting a scraper angle adjusting device. Therefore, not only is the printing quality of the fabric ensured, but also the printing efficiency is improved.

A method of driving an alternating-current (AC) motor while periodically obtaining a rotator angle of the AC motor. The method includes: (a) driving the AC motor by a dS-axis voltage, which is a voltage for an exciting current in a stationary reference frame, and a qS-axis voltage, which is a voltage for generating a rotational force in the stationary reference frame, while sequentially applying different dS-axis voltages and different qS-axis voltages to the AC motor in a control injection period; and (b) obtaining a rotator angle by a dS-axis voltage value, a qS-axis voltage value, a dS-axis current value, and a qS-axis current value in the control injection period.

The invention belongs to the technical field of height ascending devices, in particular to a good-stability height ascending device for electric power projects. In order to solve the technical problems that time and labor are wasted during height ascending of a worker, and accidents are prone to occurrence when the worker moves on a working table, the good-stability height ascending device in thescheme comprises a base plate and a steel plate, two supporting plates are fixed to the outer wall of the top of the base plate through screws, one top plate is fixed to the outer walls of the tops ofthe two supporting plates through screws, a rotating round hole is formed in the position, close to the middle, of the outer wall of the top of the top plate, two first protection rods are fixed to one side of the outer wall of the top of the top plate through screws, and two second protection rods are fixed to the outer walls of one sides of the supporting plates through screws. The good-stability height ascending device is exquisite in appearance and convenient to operate; a height ascending ladder, a pedal plate, an anti-sliding block and an arm-rest frame are arranged, so that the workercan conveniently conduct height ascending work, the anti-sliding block has the very good anti-sliding effect, and safety of the height ascending work of the worker is improved.

The invention discloses a GSC control method based on a resonance second order sliding mode. The control method is performed directly in a rest frame, power grid voltage phase estimation is omitted; complex negative sequence and harmonic component extraction is unnecessary, so that disintegration delay is avoided, and control speed is increased; adverse effect caused by power grid voltage imbalance and harmonic waves, so that stable output, low steady error state and good dynamic response features are achieved, and expected control effect is achieved; by the method, enhanced GSC control can be achieved under weak power grid voltage, and power output capacity of the converters during power grid faults is increased effectively.

The invention provides a multifunctional bionic tree tower. The multifunctional bionic tree tower comprises a lightning rod, bionic branches, an upper tower pole, two or more retainer sleeves, a maintenance platform, a rain-proof shed, a maintenance ladder, a lower tower pole, a sightseeing platform, a support, a base, a crawling ladder, two arm-rest frames and a safety door; the upper tower pole is arranged at the lower end of the lightning rod, the retainer sleeves are installed on the upper tower pole, the bionic branches are installed at the upper ends of the retainer sleeves, the rain-proof shed is arranged at the lower end of the maintenance platform, the lower tower pole is installed in the middle of the lower end of the maintenance platform, the maintenance ladder is arranged on the lower tower pole, the support is arranged at the lower end of the sightseeing platform, the base is installed at the lower end of the support, the safety door is arranged on the right end face of the sightseeing platform, the crawling ladder is arranged at the lower end of the safety door, the arm-rest frames are symmetrically fixed at the front end and the rear end of the crawling ladder, and the top end of the crawling ladder is fixed at the right end of the sightseeing platform. The multifunctional bionic tree tower achieves the multifunctional effect, use is convenient, maintenance is convenient, the structure is simple, the functionality is improved, the stability is good, and the reliability is high.

Provided is a method for suppressing a circulating current in a modular multi-level converter for a high voltage direction-current (HVDC) transmission system. The HVDC transmission system converts an alternating current (AC) into a direct current (DC) and vice versa, transmits energy using a DC cable, and including a modular multilevel converter generating a high voltage source by stacking a plurality of sub-modules in series. In the circulating current suppression method, a circulating current (idiffj; j=a,b,c) of a,b,c phase in an abc 3-phase stationary reference frame, a DC current (idc) flowing in a DC cable, a current reference value (i*dc) of a DC component that needs to flow in the DC cable are inputted. The circulating current (idiffj) of the a,b,c phase is controlled to become zero. A compensation value (V*diffj) for suppressing a harmonic component of the circulating current is outputted.

The invention discloses an indirect torque control cage type rotor brushless double-fed motor reactive power control method. The control method is a cage type rotor brushless double-fed motor reactive power, rotation speed and torque control method, particularly an analytic relation between reactive power and a control winding magnetic linkage, as well as a reactive power control structure constructed on the foundation of a cage type rotor brushless double-fed motor indirect torque control system. The control method solves a control problem of reactive power in the brushless double-fed motor indirect torque control. The control system only needs resistors of two stator windings, the required motor parameters are less, the transformation of rotational coordinates is not needed, the control system is provided with a torque internal ring and can realize current amplitude limit; and the control of the cage type rotor brushless double-fed motor reactive power, an electrical torque and a magnetic linkage is realized under an alpha beta rest frame. The control method is simple and the effect is obvious.