99results about How to "Reduce alignment requirements" patented technology

A control system and method to determine position of a rotor relative to a stator for a synchronous multipole electrical machine is presented, including one for application on a fuel / electric hybrid powertrain for a vehicle. The machine includes a stator, a rotor, and a rotor position sensing mechanism. The control system controls the electrical machine, in conjunction with an electrical storage device and an inverter, using algorithms and calibrations which derive a rotor position based upon a sensorless position sensing technique, and determine an offset from a sensed rotor position. Electrical output from the inverter to the machine is controlled based the offset, which is stored non-volatile memory. A rotor position is derived based upon a sensorless position sensing technique during initial machine operation after startup of the machine, and includes operation in a torque-generative mode and in an electrical energy-generative mode.

An apparatus for redirecting physical energy includes a substrate defining a first boundary of a region, a first electrode defining a second boundary of the region, the second boundary disposed opposite to the first boundary, a second electrode adjacent to the first boundary for cooperating with the first electrode to apply a non-uniform electric field to the region, the non-uniform electric field having electrical field intensities simultaneously including a first electric field intensity and a second electric field intensity, and a layer of material disposed in the region, the layer having a variable index of refraction responsive to the electric field intensities of the non-uniform electric field, the variable index of refraction including a first index of refraction in response to the first electric field intensity and a second index of refraction in response to the second electric field intensity.

Provided is a method capable of automatically adjusting a rotation radius and measuring an inner diameter and an outer diameter of a pipe end of a steel pipe. The method is a measuring method which aims at a measuring device for the inner diameter and the outer diameter of the pipe end, wherein laser ranging probes rotate around the pipe end. According to the measuring method, by using the mode that the rotation radius is automatically adjusted during the rotation measuring process, the defect that a laser triangulation method ranging probe is limited in the measuring range is compensated, the requirement for the aligning precision between a rotating central axis and a steel pipe central axis of a rotating platform is greatly lowered, a dynamic range capable of measuring changes on a pipe diameter is enlarged, the equipment cost of an auxiliary machine is lowered, and the stability and the practicality of equipment are improved. Meanwhile, during the operation, aiming at steel pipes with different sizes, the positions of probe fixed arms do not need to be adjusted in advance, the operation procedure is reduced, and the maintenance cost is lowered.

The invention belongs to the technical field of the semiconductor device, and particularly relates to a tunneling field-effect transistor and a manufacturing method thereof. The transistor comprises a source electrode, a drain electrode, a grid electrode and a substrate. The channel of the semiconductor device is indented towards the inside of the substrate, so as to reduce the leakage current and simultaneously drive the current to rise. The invention also discloses a manufacturing method of the semiconductor device. The semiconductor device manufactured by the invention has the advantages of low leakage current, high driving current, high degree of automation and the like. The invention can reduce the static power consumption of the integrated circuit and improve the integrated level thereof.

The invention discloses a marine thrust bearing equipment test apparatus comprising a variable-frequency speed regulating motor, a gearbox, a universal coupling, an oblique base, an equipment bench, an input-end radial loading device, an output-end radial loading device and an axial loading device. An input transition shaft and an output transition shaft are respectively connected to two ends of a spindle of thrust bearing equipment; the input-end radial loading device and the output-end radial loading device are respectively used for exerting radial loading on the input transition shaft and the output transition shaft; the axial loading device is used for exerting axial load on the output transition shaft; the universal coupling is connected between the output end of the gearbox and the input transition shaft. By the arrangement, states of the thrust bearing equipment bearing axial thrust of propellers and axial hanging weight at two ends during actual marine running can be simulated, the state of obliquely marine mounting of the thrust bearing equipment can be simulated, and various performance indexes during running of a thrust bearing can be truly tested.

The invention discloses a flow two dimension velocity field measurement method and a flow two dimension velocity field measurement device based on near field scattering. The flow two dimension velocity field measurement device based on the near field scattering comprises a laser, a space filter, a collimating lens, a lens group, a CCD (charge coupled device) camera and a computer. Compared with the prior art, the flow two dimension velocity field measurement device based on the near field scattering has the advantages of being pretty simple in structure, low in demand for light path centering, and capable of achieving the purpose of effectively removing stray light under the circumstance that a complex device for eliminating central light strength is not needed. The particle diameter of tracer particles needed by a measurement technology used in the flow two dimension velocity field measurement method based on the near field scattering can be less than the wavelength of incident light emitted from the laser, and concentration of the tracer particles is high, and therefore the measurement technology can be used in measurement of a nanometer fluid flow two dimension velocity field. The measurement technology is simple and quick in data analysis, can achieve online measurement, and guarantees that accuracy and linearity of the flow two dimension velocity field measurement method based on the near field scattering are not limited by the particle diameter and the concentration of the tracer particles by using a differential processing method.

The invention discloses a fiber optic coherent ranging device and method. The fiber optic coherent ranging device comprises a demodulation unit with wavelength scanning, an optical head and an SMF (single mode fiber) conduction unit. The SMF conduction unit is used for conducting laser, transmitted from the demodulation unit, to the optical head. The optical head comprises a collimating lens system and a reference plane. The collimating lens system is used for collimating the laser outputted from a fiber end face of the SMF conduction unit. The reference plane is used for reflecting a part of the laser collimated back to the fiber end face and coupling the same into an SMF. The demodulation unit is used for detecting coherent light in the SMF and, according to the coherent light, calculating distance between the reference plane and a surface to be detected, to be specific, the coherent light is formed by cohering light, reflected or scattered from the surface to be detect, and light , reflected from the reference plane, which are coupled in the same SMF. By the use of the fiber optic coherent ranging device and method, ranging of non-optical reflection surfaces such as non-polished metal and plastic surfaces is achieved.

A control system and method to determine position of a rotor relative to a stator for a synchronous multipole electrical machine is presented, including one for application on a fuel / electric hybrid powertrain for a vehicle. The machine includes a stator, a rotor, and a rotor position sensing mechanism. The control system controls the electrical machine, in conjunction with an electrical storage device and an inverter, using algorithms and calibrations which derive a rotor position based upon a sensorless position sensing technique, and determine an offset from a sensed rotor position. Electrical output from the inverter to the machine is controlled based the offset, which is stored non-volatile memory. A rotor position is derived based upon a sensorless position sensing technique during initial machine operation after startup of the machine, and includes operation in a torque-generative mode and in an electrical energy-generative mode.

The invention discloses a coaxial spatial optical receiving-transmitting communication device. The device comprises a laser device, a collimating lens, a first beam splitter, an optical window and a convergent lens, wherein the laser device is used for generating an emission laser signal and sending out the emission laser signal; the collimating lens is used for transforming an emergent angle of the emission laser signal and the emission laser signal is emitted through the first beam splitter and the optical window; the first beam splitter is used for transmitting the emission laser signal andreflecting a receiving laser signal; the optical window is used for emitting the emission laser signal and transmitting the receiving laser signal; and the convergent lens is located on a reflected optical path formed by reflecting the receiving laser signal through the first beam splitter. According to the coaxial spatial optical receiving-transmitting communication device, a receiving-transmitting coaxial scheme is adopted; emission and receiving optical paths are coaxial, thereby being beneficial to saving an occupation volume of the communication device, and implementing coaxiality of theemission and receiving optical paths; and the collimating lens is laid in a defocusing manner, thereby improving the alignment tolerance capability and reducing the alignment requirement.

The invention discloses an unmanned aerial vehicle communication system and method. The system comprises at least one controller, at least one unmanned aerial vehicle, and at least one mesh device. Wherein the controller, the unmanned aerial vehicle and the mesh equipment are respectively used as mesh nodes, and the mesh nodes communicate with one another through a mesh network. According to the system and the method, the transmitting power of the controller can be reduced; the endurance time of the controller can be prolonged; according to the invention, the requirements of antenna alignmentcan be reduced, the operation difficulty can be reduced, flexible networking can be realized, the functions of one-control-multiple-aircraft, multi-control-one-aircraft and multi-control-multiple-aircraft can be conveniently realized, and the problems of poor communication quality caused by obstacles between the unmanned aerial vehicle and the controller and inconvenient communication distance extension can be solved.

Reducing the amount of required memory and instruction cycles when implementing Fast Fourier Transforms (FFTs) on a computer system is described. The invention optimizes FFT software using in-place bit reversal (IPBR) implemented on a processor capable of bit reversed incrementation. Enables the design of address generators that combine IPBR and one FFT stage in parallel. Increases efficiency by removing instructions to store output from a stand-alone IPBR mapping and then fetch the same data as input for the FFT stage.

According to one embodiment, a cover comprising a higher dielectric constant layer disposed outwardly from a lower dielectric constant layer is coupled to a rectenna operable to convert microwave power to electrical power. The cover receives microwave power, provides a substantial impedance match for a plurality of angles of incidence, and directs the microwave power to the rectenna. The impedance match is selected to broaden a receive pattern of the rectenna.

The invention discloses a new energy automobile motor test board, comprising a workbench, a dynamometer, a driving device as well as a rotor locking mechanism and a spline expanding and clamping sheath structure, wherein the dynamometer is arranged on the workbench, an output shaft is arranged inside the dynamometer, the output shaft is connected with a to-be-tested motor shaft, and the motor shaft is connected with a new energy motor; the driving device is in charge of driving the dynamometer and the new energy motor, when the driving device drives the dynamometer, the new energy motor generates electricity, and when the driving device drives the new energy motor, the dynamometer generates electricity; the rotor locking mechanism is in charge of preventing the output shaft from rotating,one side of the rotor locking mechanism is coaxially connected with the dynamometer, and the other side of the rotor locking mechanism is connected with a bearing block; and the spline expanding and clamping sheath structure is in charge of flexibly connecting the output shaft with the motor shaft, one side of the spline expanding and clamping sheath structure is connected with the bearing block,and the other side of the spline expanding and clamping sheath structure is connected with the motor shaft directly or is connected with the motor shaft by virtue of a spline adapter shaft of a hollowstructure. The new energy automobile motor test board disclosed by the invention can perform a multi-angle locked-rotor test on the locked-rotor phenomenon of a tested motor and also can prevent themotor shaft from running out.

The invention provides a long-shaft output electrical shaft driven type underwater dredge pump transmission system, which is used for transmitting the power and rotating speed of a motor to an underwater dredge pump. The transmission system is characterized in that the transmission system comprises an underwater gearbox, at least two hollow shafts, an intermediate supporting device and a bridge frame; an input shaft of the underwater gearbox is connected with the motor through a high-elasticity coupling; at least two hollow shafts and at least one intermediate supporting device form a long shaft system; in the long shaft system, two ends of the intermediate supporting device are connected with the two hollow shafts through crown gear couplings respectively, and the two hollow shafts are positioned at two ends of the long shaft system respectively; an output shaft of the underwater gearbox is connected with one hollow shaft positioned at one end of the long shaft system through one crown gear coupling, and the other hollow shaft positioned at the other end of the long shaft system is connected with the underwater dredge pump through the other crown gear coupling; and the intermediate supporting device, the underwater gearbox, the motor and the underwater dredge pump are all supported by the bridge frame.

The invention relates to a curved channel waveguide slow-wave line, belonging to the technical field of microwave electronic tubes and relating to a slow-wave line structure in a microwave tube high-frequency system. The slow-wave line is formed by bending the channel back and forth by the channel waveguide along a direction of the channel; an electric field of a ground mode in the channel waveguide is the strongest on the vertical axis of the slow-wave line and generates the strongest interaction right with an electron bunch; a gap is left between an upper metal plate and a lower metal plateof the channel waveguide without special electron bunch channels; and a side wall for supporting the gap between the upper and lower metal plates can be made of metal, insulating materials or microwave absorption materials. The curved channel waveguide keeps the advantages of large size, low consumption and wide band of the channel waveguide, and the curved channel waveguide slow-wave line also allows large-size electron bunch to pass through, thereby having higher output power and efficiency. At the same time, the slow-wave line has the characteristics of relatively simple structure, low processing precision requirement and easy processing. The curved channel waveguide slow-wave line is more suitable to be applied in the travelling wave tube of the wave segments of millimeter wave and submillimeter wave.

A device employing at least one wavelength sieve / combiner that operates on discrete wavelength units and is optically interposed between an array of fibers and an array of micro mirrors which may be configured to act as in a multiplexing mode, a demultiplexing mode, a broadcast mode, and combinations of such modes. Each wavelength sieve / combiner can split a wavelength division multiplexed (WDM) beam into various discrete wavelength unit beams, combine various discrete wavelength unit beams into a WDM beam, or cause multiple copies of part or all of the wavelengths to be supplied as outputs. Typically, each fiber is associated with one wavelength sieve / combiner. Preferably, the beams between a wavelength sieve / combiner and the micro mirror array should be converging to the plane of the micro mirror array.

The invention relates to the technical field of machining and discloses a short tail rivet pulling fastening suite, a disassembly and assembly tool and a using method of the disassembly and assembly tool. The short tail 3.4 rivet pulling fastening suite comprises a short tail 3.4 bolt and a sleeve ring 1. The disassembly and assembly tool comprises a mounting tool 4 and a disassembly tool 5. Whenconcretely in use, fixation and removal of the sleeve ring 1 on the short tail 3.4 bolt are realized through the disassembly and assembly tool to realize mounting and taking off of a component 2. By adopting the short tail 3.4 rivet pulling fastening suite, the basic requirements for rapid mounting and precision positioning of the short tail 3.4 rivet pulling bolt are met, the reliability and thestability of a short tail 3.4 structure and an elastic block button 4.2 in the application process; and the problems of difficulty in processing during production and difficulty in positioning in themounting process of the existing short tail 3.4 rivet pulling fastener are solved, the clamping force of a short tail 3.4 is improved, the stress concentration effect is lowered, and the service lifeof the elastic block button 4.2 is prolonged, and therefore, the short tail rivet pulling fastening suite is worthy of popularization and use.

The invention discloses a shutter-shaped baffle plate fixed tube-sheet heat exchanger and a machining and installing method and belongs to the technical field of heat exchangers used in industries of petrochemical engineering, energy power and the like. The shutter-shaped baffle plate fixed tube-sheet heat exchanger is characterized in that a heat exchange tube bundle installed on a shutter-shaped baffle plate in a penetrating and inserted manner is arranged in a heat exchanger shell; the heat exchange tube bundle is connected to fixed tube sheets arranged between a tube box and the shell in an expanded manner or is welded and fixed to the fixed tube sheets arranged between the tube box and the shell. A tube side inlet is formed in the upper side of a front tube box body, and a tube side outlet is formed in the lower side of a rear tube box body. A shell side outlet is formed in the upper side of the shell, and a shell side inlet is formed in the lower side of the shell. The shutter baffle plate is composed of a baffle ring and shutter blades arranged at a certain inclination angle. A flowing flow field of a shell side is even, a flowing dead zone of the shell side is small, meanwhile, the local fluid turbulence level is improved through the shutter baffle plate, the heat exchange efficiency is improved, consumption of pump power under the same heat exchange amount is reduced, the structure is compact, installing and machining are simple, scaling is not liable to be generated, the service life is long, and the shutter-shaped baffle plate fixed tube-sheet heat exchanger is suitable for occasions such as petrochemical engineering and power plants where fluid flow is large and consumption of pump power is large.

The invention discloses a magnesium / titanium laser melting braze welding method assisted by a nickel-plated layer. The method is applicable to the field of dissimilar metal welding and is used for solving the problems of no occurrence of metallurgic reaction and great melting point difference between the existing magnesium / titanium. The method is characterized in that firstly, nickel is electroplated on a titanium plate subjected to acid cleaning is used as a middle layer; then, a lap joint mode that a magnesium plate is positioned at the upper part and the titanium plate is positioned at the lower part is used; meanwhile, high-pure argon gas is used for positive and opposite side protection; the magnesium / titanium connection is realized through magnesium alloy wire filling. The method has the advantages that the moistening spreading capability of the magnesium alloy on the titanium plate is effectively improved; joints without obvious defects can be obtained; the tensile strength can reach 243 N / mm; the joint efficiency is 90 percent of a magnesium plate; higher practical values are realized.

The invention discloses a degradable self-supported thin-film transistor device, mainly comprising a self-supported dielectric layer, a semiconductor active layer, a source electrode, a drain electrode and a gate electrode, and characterized in that natural macromolecular polymer film having ionic conductivity is used herein as the self-supported dielectric layer, and the semiconductor active layer and the coplanar source electrode, drain electrode and gate electrode are deposited on the self-supported dielectric layer in sequence, wherein the semiconductor active layer is arranged between thesource electrode and the drain electrode. The degradable self-supported thin-film transistor device has the advantages that the dielectric layer having supporting performance is used herein, extra substrates are not required, and the material structure of the degradable self-supported thin-film transistor device is simplified; the natural macromolecular polymer film has low cost and has good stability under room-temperature conventional environments; by controlling composition and structure of the film herein, it is possible to adjust the degradation rate of the film in a special environment,and therefore, the thin-film transistor device with controllable degradation rate is achieved.

The invention discloses a grating coupler based on a lithium niobate film material and a manufacturing method thereof. The grating coupler comprises a grating coupler based on the lithium niobate thinfilm material comprising a lithium niobate photonic chip on an insulator and an optical fiber arranged on the lithium niobate photonic chip, and the lithium niobate photonic chip on the insulator sequentially comprises a convergent grating coupling mechanism, a silicon dioxide buried layer and a silicon substrate from top to bottom. The device is relatively high in coupling efficiency and relatively large in working wavelength bandwidth, facilitates large-scale integration and is used for performing performance test on devices on the lithium niobate photon integrated chip.

The present invention belongs to the medical technology field, and discloses a method and system for detection based on brain medical imaging. A machine learning algorithm is employed to automaticallyextract graphic features of each region of a brain; and using machine learning to judge a diagnosis result based on the extracted image features. The detection system comprises: a brain image database, a related image feature library, an image feature extraction module, a diagnostic module and a human-computer interaction interface. According to the method for detection based on brain medical imaging provided in the embodiment of the present invention, an image feature automatic extraction algorithm uses a machine learning algorithm to automatically extract the graphic features of various regions of the brain; and the diagnostic algorithm uses the machine learning to provide diagnostic results and diagnostic evidenced based on the image features.

The invention concerns a tower for a wind turbine which tower supports a nacelle with bearings in which a horizontal rotation axis with blades can rotate, the tower comprises a steel wall of circular section, a drive for rotating the nacelle around a vertical axis of the circular section and at the bottom of the tower foundation means for supporting the tower in upright position. In accordance with the invention the foundation means comprises a bearing on a base which bearing supports the tower and a support ring positioned by three or more legs above the base for keeping the tower upright wherein in the support ring rollers or wheels press against the steel wall of circular section.

The invention discloses a contact type charging device and an unmanned aerial vehicle. The contact type charging device comprises a power supply unit and a charging unit which are split; the power supply unit comprises a power supply circuit and a charging board; the charging unit comprises a charging contact, a switching circuit, an identification circuit and a battery. The invention specially designs the polarity and arrangement manner of charging poles on the charging board, and combines a multi-row charging contact arrangement manner to realize the technical effect that normal charging canbe realized as long as a charging unit falls onto a charging pole region on the charging board, thereby reducing the alignment requirements of the charging unit and the charging board, and simplifying the alignment operation. By applying the contact type charging device to the unmanned aerial vehicle, as long as the unmanned aerial vehicle lands onto the charging board, the unmanned aerial vehicle can be charged, so as to reduce the software design difficulty of the unmanned aerial vehicle and facilitate the development of an autonomous charging technology of the unmanned aerial vehicle.

The invention provides an adaptor connector and an electric connector assembly. The electric connector assembly comprises a first connector, a second connector and the adaptor connector, wherein the adaptor connector comprises a shell and a contact unit installed inside the shell; the contact unit is provided with two inserted connection ends; an an-falling structure for limiting the contact unitinside the shell is arranged on the shell; the contact unit is installed inside the shell in a floating manner so as to move in the inserted connection direction and the direction vertical to the inserted connection direction. Due to the fact that the electric connector assembly comprises three parts such as the first connector, the second connector and a contact assembly, and the contact unit ofthe adaptor connector is installed inside the shell in the floating manner so as to move in the inserted connection direction and the direction vertical to the inserted connection direction, so that,during inserted connection, the offset of an inserted closing part can be reduced through the cooperation of two ends of the contact unit with the first connector and the second connector, so that possibility is provide for the miniaturization design of electric connector products and the transmission design of high-speed data.

The invention relates to the field of optical devices, in particular to a 2*2 mechanical optical switch. The 2*2 mechanical optical switch comprises two sets of four-fiber collimators, and glass prisms capable of being freely inserted and separated are arranged among the four-fiber collimators. In the separating state, light beams of a first optical fiber, a second optical fiber, a fifth optical fiber and a sixth optical fiber are directly coupled to a seventh optical fiber, an eighth optical fiber, a third optical fiber and a fourth optical fiber respectively. In the inserting state, after the light beams are deviated through the glass prisms, the first optical fiber is coupled to the third optical fiber, and at the same time, the second optical fiber is coupled to the fourth optical fiber. Besides, the fifth optical fiber is connected with the sixth optical fiber, and the eighth optical fiber is connected with the seventh optical fiber. A bypass loop is formed by leading the light to the other side from one side only through one displacement optical element. Therefore, the dimensionality of optical fiber alignment adjustment can be reduced, larger positions and angle allowances are allowed, the packing difficulty can be reduced, and the 2*2 mechanical optical switch is especially suitable for being produced on a large scale.

The invention relates to a measuring guide wire for blood pressure in blood vessels. A guide wire far-end main body comprises an inner core wire and a far-end soft section, a developing ring, a near-end soft section, a near-end pipe body, a pressure sensor and a plurality of guide wires which sleeve the inner core wire, wherein a near-end connecting section comprises a plurality of electric conductive rings and a plurality of inner-layer insulation rings; a rear-end pipe body is coaxially arranged with the electric conductive rings and the inner-layer insulation rings; the inner-layer insulation rings are locally located in the electric conductive rings; the outer diameter of the rear-end pipe body is identical to the outer diameters of the electric conductive rings; the near-end connecting section further comprises a plurality of connectors which are respectively arranged on the outer side of the inner-layer insulation rings and can cause the near-end pipe body and the electric conductive ring adjacent to the near-end pipe body as well as the adjacent electric conductive rings smoothly transit. According to the invention, the transmission connectivity of the pressure signal is ensured, the matching degree between the measuring guide wire and the other endovascular intervention instruments (such as, balloon catheter, bracketry and microtubule) is enhanced and the requirement for the insulation ring alignment in the assembling process of the electric conductive rings is reduced.

The invention discloses a steam and power dual-power-drive fan structure capable of achieving automatic switching. The problems that a fan drive structure is complex, single gas source drive or motordrive is adopted, at most of time, normal running needs cannot be met, and normal production is affected are solved. Two permanent magnet couplings are selected according to the actual industry and mining, when the permanent magnet couplings work, a controller controls an executor motor to work, an output shaft of the executor motor rotates and drives a pushing disc to rotate through a swing rod and a connecting rod, a pushing convex strip slides over a convex block from thin to thick, a sliding sleeve and a shaft sleeve are pushed to move in the direction away from the pushing disc, a permanent magnet disc gets close to a conductor disc, the air gap between the conductor disc and the permanent magnet disc is reduced, a steam turbine output shaft or electric motor output shaft can drive afan rotating shaft to rotate, the controller controls the rotation angle of the output shaft of the executor motor to achieve output torque adjusting between 0 and 100%, and engaging and disengaging between a steam turbine and a fan and between an electric motor and the fan can be achieved.