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185results about How to "Reduce design cost" patented technology

Motor train unit traction system powered up by overhead contact system and power pack in combined mode

ActiveCN103407377AReduce design costReduce size and powerSpeed controllerElectric devicesTraction systemElectric generator
A motor train unit traction system powered up by a overhead contact system and a power pack in a combined mode is characterized by mainly comprising a traction transformer, the power pack, a traction converter, a traction motor and a braking resistor, wherein the overhead contact system is connected with a primary side of the traction transformer through a pantograph, two secondary side windings of the traction transformer are directly connected with the traction converter, the traction converter is connected with the traction motor, a diesel engine and a power generator form the power pack, and three-phase output of the power generator is directly connected with the traction converter. The motor train unit traction system powered up by the overhead contact system and the power pack in the combined mode can achieve overline operation and can meet different conveying requirements in different environments. At a non-electric railway section, a power pack power supplying mode is adopted, and normal operation under the condition without the overhead contact system is achieved. Due to the adoption of two sets of power systems, a motor train unit not only has the operating capacity at the non-electric railway section, but also has the functions of emergency rescue and war preparedness in special rainy or snowy weather or when the overhead contact system is damaged.
Owner:CHINA RAILWAYS CORPORATION +1

Adjustable offshore large wind power blade lifting appliance and lifting method thereof

The invention provides an adjustable offshore large wind power blade lifting appliance and a lifting method thereof, and relates to the blade lifting appliance and the lifting method of an offshore large wind power generator set. According to the lifting method, the adjustable offshore large wind power blade lifting appliance is adopted, and the lifting appliance comprises a platform, a blade rootend clamp, a blade tip end clamp, a balance weight and a swing arm, wherein the swing arm is hinged to the upper surface of the platform, the lower clamping head I is carried out horizontal positioning control by utilizing the positioning hydraulic cylinder I of the lifting appliance, the lower clamping head II is carried out horizontal positioning control by utilizing the positioning hydraulic cylinder II, the upper clamping head I and the upper clamping head II is carried out fall control by utilizing the clamping hydraulic cylinder I and clamping hydraulic cylinder II respectively, the hydraulic cylinder is adjusted and the hydraulic cylinder can be used for performing lead hammer intersection angle control on blades installed in front of the impeller, and adjusting requirements of mounting angles of blades can be met; except rubber block I and rubber block II, other parts of the lifting appliance are not in make contact with the blades in the whole lifting process, and the clamping force can also be controlled by clamping hydraulic cylinder I and clamping hydraulic cylinder II, the surfaces of the blades cannot be damaged, and reliable lifting is carried out on the offshore large wind power blade.
Owner:JULI SLING +2

System and method for testing parasitic inductance

The invention provides a system and a method for testing a parasitic inductance value. The system comprises a circuit to be tested, a driving device and a test device, wherein a direct current source supplies power to an inversion bridge arm of the circuit to be tested; the driving device is electrically connected to a control electrode of each switch body in the inversion bridge arm; the test device is used for testing an inversion bridge arm voltage which is carried by a switch body to be tested in the inversion bridge arm during instant turning-off and the change rate of a current which flows through the inversion bridge arm; and according to voltages of the switch body and the direct current source and the change rate of the current which flows through the inversion bridge arm, the parasitic inductance value is obtained by calculation. By adoption of the invention, under the control of the driving device, an upper bridge arm switch body keeps turned on, and a lower bridge arm switch body is turned on and turned off; and the test device tests a bridge arm voltage which is carried by the lower bridge arm switch body and the change rate of the current which flows through the lower bridge arm switch body, the parasitic inductance value is obtained by calculation, and quantization basis is provided for selection of design parameters of an absorption circuit, so that the reliability of an inverter is optimized, and the design cost of a product can be reduced.
Owner:DELTA ELECTRONICS SHANGHAI CO LTD +1

A multi-material continuum structure topology optimization design method based on an independent continuous mapping method

The invention discloses a multi-material continuum structure topology optimization design method based on an independent continuous mapping method. The multi-material continuum structure topology optimization design method comprises the following steps: (1) determining continuum structure design parameters including a design domain size, a structure boundary condition and an actual bearing condition; And (2) establishing an optimization model, wherein the optimization model comprises determination of an optimization target, a displacement constraint condition and a convergence criterion initial preset condition. (3) establishing a relationship between the independent topological variables and the constraint conditions and the optimization target, and performing standardization processing on the optimization equation; (4) solving the optimization equation, and updating the optimization column form based on a set iterative loop system and a set convergence condition; And (5) outputting an optimization result to obtain a multi-material structure optimal topological configuration and a structure weight fraction iteration curve. The invention provides a practical multi-material continuum structure design method, and aims to achieve the purpose of lightest structure weight under the condition of meeting the constraint condition of structure displacement. The method is of great significance in engineering practice.
Owner:BEIJING UNIV OF TECH

Method for analyzing fatigue strength of brake control device on basis of finite element

The invention relates to a method for analyzing a fatigue strength of a brake control device on the basis of a finite element. The method comprises the following steps of: extracting a middle plane of an air cylinder hanger, setting a thickness and then carrying out finite element meshing on each part of the brake control device; carrying out welding binding constraint on the air cylinder hanger and an air cylinder; applying masses to mass centers of the air cylinder and a gas circuit board and carrying out mass center coupling; modeling, setting boundary conditions, applying a load and carrying out vibration shock simulating calculation; and carrying out fatigue calculation and converting recycling times into a service life. The invention not only considers a welding method and a processing mode of the brake control device, but also considers the direction and the order of magnitude, of the applied vibration shock, and is based on a vibration shock outline standard; on one hand, the service life of the brake control device can be precast according to a simulation result, so that the structure of the brake control device is optimally designed; and on the other hand, a variation model of performance parameters can be established on the basis of the simulation result, and the design period and the design cost of the brake control device can be reduced.
Owner:NANJING CRRC PUZHEN HAITAI BRAKE EQUIP CO LTD

Polarization maintaining fiber beat length measuring apparatus

The invention discloses a polarization maintaining optical fiber beat length measuring apparatus, which comprises an optical path system, a force application device and a data acquisition and processing system. The optical path system containing a light source, a crystal polarizer, a focusing lens and a crystal polarization analyzer has the function of providing linearly polarized light for measurement; the force application device which adopts a travel mechanism with a high-precision bidirectional step motor, a clamp mechanism with protective measures, and a force application mechanism with a micrometer has the function of fixing a polarization maintaining optical fiber to be measured, applying a due radial pressure along the length direction of the polarization maintaining optical fiber to be measured in a mobile mode to enable the output optical power which has passed through the polarization maintaining optical fiber to be measured to have a periodical variation; the data acquisition and processing system picks up the optical power outputted by the measured optical fiber through an optical power meter and obtains the average beat length of the measured polarization maintaining optical fiber and the optical power variation curve with the acquisition time after a computer carries out corresponding processing and computation of the output of the optical power meter. The polarization maintaining optical fiber beat length measuring apparatus has the advantages of simple structure, convenient operation and high measurement precision.
Owner:CHINA NORTH IND NO 205 RES INST

Transformer silicon steel sheet automatic stacking production system and method

ActiveCN107833741ACompact structureReduce design costTransformers/inductances detailsInductances/transformers/magnets manufactureEngineeringPlacement action
The invention discloses a silicon steel sheet automatic stacking production system and method, and belongs to the field of transformer automatic production. A material box pushing rod is arranged above a front section of a logistics transmission mechanism; a dual-workstation exchanging rotation platform mechanism is arranged on the front of the material box pushing rod; an automatic stacking mechanism and a material releasing mechanism are arranged on a side of a front end of the logistics transmission mechanism; the transmission mechanism can convey silicon steel sheets placed in the materialboxes to the dual-workstation exchanging rotation platform to achieve dual-workstation exchanging, the material boxes with the silicon steel sheets can rotate under suckers of the automatic stackingmechanism, the silicon steel sheets can be lifted to the top of the material boxes under lifting of screw nut mechanisms, the suckers can suck the silicon steel sheets tightly, the silicon steel sheets are rotated, the silicon steel sheets reach above the material releasing mechanism and fall to the material releasing mechanism, and automatic stacking of the silicon steel sheets of a transformercan be achieved through repeated suction and placement actions. The a silicon steel sheet automatic stacking production system can automatically and rapidly convey the silicon steel sheets, lift and transmit materials, suck the silicon steel sheets, and stack the silicon steel sheets, is compact in structure, is easy to operate, and can improve the processing precision.
Owner:于雯

Synchronous rectification circuit, wireless charging system and synchronous rectification method

The invention relates to a synchronous rectification circuit, a wireless charging system and a synchronous rectification method. The synchronous rectification circuit comprises: a zero-crossing comparator, used for processing a signal obtained from a coil to obtain a first alternating-current signal and a second alternating-current signal; an FPGA module, used for obtaining dead zone protection time according to the first alternating-current signal and the second alternating-current signal; an MOS transistor driving module, used for forming a driving signal of an MOS transistor rectification module according to the dead zone protection time obtained by the FPGA module; and the MOS transistor rectification module, used for realizing synchronous rectification according to the driving signal and outputting a signal after synchronous rectification to a load. With the adoption of the synchronous rectification circuit, the wireless charging system and the synchronous rectification method, on the basis of ensuring synchronous rectification efficiency, the requirement of real-time control on a time sequence in synchronous rectification is lowered, the corresponding dead zone time can be set by adaptively following alternating-current signals of different frequencies, and the design cost of synchronous rectification control is reduced.
Owner:CRM ICBG (WUXI) CO LTD

Broadband adaptive adjustment device and method for coupling amount of resonant cavity

ActiveCN110416681AReduce design costReduce interfering noiseResonatorsCoupling devicesPhysicsBroadband
The invention relates to a broadband adaptive adjustment device and method for the coupling amount of a resonant cavity. According to the invention, a first coupling device used for receiving the coupling amount of the resonant cavity and at least two second coupling devices used for resonant excitation are inserted into different positions of the resonant cavity, a network analyzer receives the coupling amount of the resonant cavity transmitted by the first coupling device and transmits the coupling amount to an upper computer, and the upper computer generates a control signal to control thedisplacement and the angle of the first coupling device and the second coupling devices through a data acquisition device, so that the coupling amount under a resonant working mode is adaptively adjusted; the upper computer is further used for generating a control signal of a microwave switch and controlling the microwave signal to be transmitted to one of the second coupling devices through the microwave switch, so that the switching of different resonant working modes is realized, the adaptive adjustment of the coupling amount of multiple resonant working modes of the single resonant cavityunder broadband is realized, the interference parasitic modes are reduced, the design cost is effectively reduced, the cavity design efficiency is improved, and the test precision of dielectric parameters of materials under broadband is improved.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Automatic arch dam pouring block plotting device and plotting method

The invention relates to the technology of modeling, and discloses an automatic arch dam pouring block plotting method, and solves the problems of heavy workload, high difficulty and prone errors caused by manual drawing in the prior art. The technical scheme comprises the main points that: the arch dam pouring block plotting method comprises the following steps of: a. constructing a basic database including arch dam modeling-related data information; b. establishing a three-dimensional model of an overall arch dam; c. inputting the information of a pouring block which needs to be plotted, and extracting the three-dimensional structural information of the pouring block from the three-dimensional model of the overall arch dam; d. outputting the acquired three-dimensional structural information of the pouring block, and generating two-dimensional drawing paper through a two-dimensional plotting module; and e. marking the generated two-dimensional drawing paper and counting basic information, and indicating on a drawing. In addition, the invention also discloses an automatic arch dam pouring block plotting device. The method and the device realize automatic arch dam pouring block plotting, speed up a design schedule, reduce design cost, reduce error rate, improve production efficiency and are suitable for planning to build an arch dam.
Owner:POWERCHINA CHENGDU ENG

Communication system and method on basis of double-speed synchronous dynamic random access memory interface

The invention relates to a mobile terminal and discloses a communication system and method on the basis of a double-speed synchronous dynamic random access memory interface. A master controller of the communication system is communicated with a slave controller through the simple double-speed synchronous dynamic random access memory interface. The double-speed synchronous dynamic random access memory interface comprises six signal lines, chip-selection signals (CS#), positive time clock signals (CK), negative clock signals (CK#), read-write selection signals (WE#) are output signals in the master controller and input signals in the slave controller, digital signals (DQ) and data strobe pulse signals (DQS) are input and output signals, the DQS and the CK are same in frequency, and the upper and lower edges of the DQS are used for data transmission. High-speed data transmission can be realized by only six signals lines, the master controller and the slave controller are respectively used for a baseband communication processor and an application processor, and the problems that a conventional UART (universal asynchronous receiver/transmitter) interface is low in transmission speed and USB (universal serial bus) software development and transplant are too complicated are solved.
Owner:LEADCORE TECH

Control apparatus for power switching circuit and control means thereof

A control device of a power conversion circuit and a control method thereof are disclosed. The control method of the power conversion circuit includes the following steps: generating a first control signal and a second control signal; adjusting the first control signal according to the output voltage of the power conversion circuit; inspecting the output voltage of the power conversion circuit so as to obtain an inspecting result; the second control signal controlling the power conversion circuit if the result displays that the input voltage of the power conversion circuit is lower than the common operating standard position; the first control signal controlling the power conversion circuit if the result displays that the input voltage of the power conversion circuit is higher than the common operating standard position, wherein the working period of the first control signal is longer than the working period of the second control signal. The invention can obtain the input voltage standard position by inspecting the output voltage of the power conversion circuit; moreover, when the control device is installed on an integrated circuit, an extra foot position is not needed to be added for carrying out input voltage inspection, and the quantity of the foot position of the integrated circuit is reduced.
Owner:WINBOND ELECTRONICS CORP

Mechanical environment prediction method of lunar probe soft landing impact

The invention relates to a mechanical environment prediction method of lunar probe soft landing impact, and belongs to the technical field of deep space exploration. According to the method, a non-linear finite element model of probe lunar surface soft landing is established, model reduction is conducted on a probe according to the generalized dynamic condensation method, and therefore the purpose of improving the solving efficiency is achieved; then, non-linear finite element solving is conducted on the reduced model to obtain a dynamic response of the structure of the probe; after an acceleration speed response at a concerted position is obtained, the shock spectrum of the acceleration speed response of the structure is calculated according to a recursion digital filtering method, wherein the shock spectrum is used for describing the dynamic environment of probe landing impact; at last, a maximum expected environment is obtained by the adoption of a spectrum enveloping method, wherein the maximum expected environment is used for setting the designing and testing conditions of equipment. By means of the mechanical environment prediction method, the solving efficiency is improved and the product designing period is shortened.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

An evaluation system and method for built-in sensing network terminal

The invention relates to an embedded sensor network terminal evaluation system and method. The system is the combination of one or more a 32-bit embedded core system, a sensor signal conditioning circuit module, a sensor simulation signal source, and a sensor network terminal transmission bus interface module. The sensor signal conditioning circuit module comprises a switch quantity conditioning circuit and a gain conditioning circuit; and the sensor network terminal transmission bus interface module comprises a digital quantity sensor interface, a switch quantity sensor interface, an analog quantity sensor interface, a local communication interface, and a network communication interface. The embedded sensor network terminal evaluation method includes the evaluation method of the embedded core system, the evaluation method of signal collection and processing of the sensor, and the evaluation method of the local communication interface and the network communication interface. Before manufacturing the chip, the invention can subject hardware and software to reasonable configuration and regulation according to the design requirement, thereby improving the success ratio of the system design. The invention can be widely applied in information technology field.
Owner:BEIJING UNION UNIVERSITY
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