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Measurement method of thickness of subsurface damaged layer of bucky optical material
InactiveCN101672625AHigh precisionStrong engineering applicabilityPreparing sample for investigationUsing optical meansEnvironmental geologySurface shape
The invention discloses a measurement method of the thickness of a subsurface damaged layer of a bucky optical material. The measurement method comprises the following steps: processing the surface ofa sample by a magneto rheological process to form a specific cutting plane; cutting the subsurface damaged layer and reflecting a subsurface damage to the cutting plane; processing the cutting planewith a corrosive chemical agent to expose and amplify subsurface cracks on the cutting plane; measuring roughness values of different positions on the cutting plane by a roughness measurement tool toobtain a roughness value change curve; working out a height difference between a critical point or a climax and a starting point recorded in measurement process, or a height difference between two points projected on an original surface, i.e. the thickness d of the subsurface damaged layer of the sample, wherein the critical point or climax to level off is obtained from a roughness curve by the data processing. The measurement method can quickly and accurately measure optical samples of multiple surface shapes and multiple materials and can realize heavy-calibre and engineered application.
Owner:XI AN JIAOTONG UNIV
Method for simultaneously determining pile position and critical depth of anti-slide pile by using displacement monitoring
InactiveCN103150421ARealize OKAvoid condition mismatchSpecial data processing applicationsLandslideCritical depth
The invention discloses a method for simultaneously determining a pile position and a critical depth of an anti-slide pile by using displacement monitoring, which is applicable to determining and designing the pile position and the critical depth of the anti-slide pile on an accumulated layer landslide. The method comprises the following steps of: (1) performing investigation, analysis and evaluation aiming at the geology of a side slope to be managed to determine a landslide body region; (2) dividing grids on the landslide body and selecting a displacement monitoring point position; (3) monitoring equipment mounting and displacement monitoring; (4) determining a synthetic total displacement value S (i, j) and vertical displacement direction rate of each monitoring point of landslide displacement; (5) determining landslide instability property and an anti-slide pile space reinforcement position; (6) determining the critical depth of a shearing slip band of the landslide body; (7) determining the pile length of the anti-slide pile of the landslide; and (8) performing information construction of the anti-slide pile. The method has the advantages of less investment cost, reliable design principle, high position determination accuracy, easiness, convenience, fastness, easiness in implementation and strong engineering applicability.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY +1
Vehicle body structure steady design method based two uncertain saloon cars
InactiveCN103136428AImprove effectivenessImprove accuracySpecial data processing applicationsCar manufacturingDesign methods
The invention discloses an approximation model uncertainty state salon car body structure steady design method in the technical field of automobile manufacturing, based on parameter uncertainty of vehicle body design variable, and taking vehicle body performance to respond a Kriging model. The salon car body structure steady design method aims at overcoming the defects that at present, a vehicle steady design method just considers parameter uncertainty to obtain steady solving which easily generates big forecast error, and even generates failure constraints, vehicle body parameter uncertainty can be reduced, and approximation model uncertainty affects vehicle body structural performance. The salon car body structure steady design method improves accuracy of design scheme target performance of a vehicle body structure and effectiveness of restraint performance.
Owner:SHANGHAI JIAO TONG UNIV
Portable ultraphonic phased array detection imager
InactiveCN101726540ASimple human-computer interactionImprove human-computer interactionAnalysing solids using sonic/ultrasonic/infrasonic wavesSonificationPhased array
The invention provides a portable ultraphonic phased array detection imager which has simple, convenient and natural man-machine interaction and high engineer applicability and comprises a touch screen, a computer, an ultraphonic phased array circuit system, an ultraphonic phased array probe and detection imaging software, wherein the touch screen is connected with the computer; the computer is connected with the ultraphonic phased array circuit system through a data bus; the touch screen, the computer and the ultraphonic phased array circuit system are integrated to form a main imager body which is externally connected with the ultraphonic phased array probe through a cable; and the detection imaging software is arranged on the computer. The invention can be used for manual detection, can obtain defective A, B or S scanning images, can also be used for the automatic nondestructive inspection in the industry field by connecting with a scanner with one or two freedom degrees and installing the ultraphonic phased array probe on a clamp of the scanner and can obtain detective A, B, C scanning images, and therefore, the invention is very suitable for the nondestructive inspection in the industry field.
Owner:HARBIN INST OF TECH
Wind power integration prediction method based on multi-source numerical value weather forecast
InactiveCN106803129AForecast robustImprove accuracyForecastingCombined methodMultivariable linear regression
The invention relates to a wind power integration prediction method based on multi-source numerical value weather forecast. The method includes the following steps: a first step of pre-processing prediction data; a second step of establishing a wind power prediction model; a third step of determining linear optimization combination parameters, establishing a linear regression model; a fourth step of predicting future time wind power. According to the invention, the method obtains a group of wind power prediction results based on the multi-source numerical weather forecast and conducts combination optimization on the results by using multiple linear regression so as to provide prediction result which is used for guiding the certainty of production and operation for grid scheduling departments.
Owner:CHINA ELECTRIC POWER RES INST +1
Safety protection method in robot-assisted cardiovascular interventional operation
InactiveCN107361844APrecise Security ProtectionEasy to implementSurgical navigation systemsMedicineRadiology
The invention relates to a safety protection method in robot-assisted cardiovascular interventional surgery, comprising: 1) geometrically modeling blood vessels; The curvature of the position point is normalized; 3) According to the curvature and radius information of the blood vessel, the inner area is dynamically divided, and the primary safety protection measures in robot-assisted cardiovascular interventional surgery are established; 4) The guide wire is tracked in real time with the help of an electromagnetic tracker The position of the front end is interpolated and reconstructed using the cardinal spline curve to establish the geometric model of the guide wire; 5) Calculate the inflection point and branch of the blood vessel under the surgical path, and dynamically constrain the advancing speed and angle of the guide wire; 6) Adjust the guide wire Perform collision detection with the vessel wall; 7) predict the collision response according to the collision detection result. Compared with the prior art, the invention has the advantages of stability, reliability, convenient realization, low cost, strong engineering applicability and the like.
Owner:SHANGHAI JIAO TONG UNIV
Correction method for TIADC gain and time error based on spectral analysis
ActiveCN106209103ASimple calculationEasy to implementAnalogue-digital convertersTime errorFrequency spectrum
The invention discloses a correction method for a TIADC gain and a time error based on spectral analysis. The spectral analysis is carried out on branch ADC sampling data by employing FFT, an amplitude and a phase on a specific frequency point are calculated to obtain corresponding gain and time error estimated values, and then corresponding gain and time error correction values are obtained. This method is simple to implement, extremely strong in engineering application, simple in calculation and high in accuracy.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Self-centering unmanned ship suitable for adverse sea conditions and work manner of self-centering unmanned ship
InactiveCN107187560ASimple structureGuaranteed waterproof performancePropulsion power plantsUnmanned surface vesselsRadarPropeller
Owner:DALIAN UNIV OF TECH
Natural gas hydrate preparation system based on compressed gas refrigeration cycle
InactiveCN103992829AIncrease generation speedFully contactedTransportation and packagingGaseous fuelsChillerProcess engineering
The invention provides a natural gas hydrate preparation system based on compressed gas refrigeration cycle, which is characterized by comprising a gas supply unit for supplying natural gas required by hydration reaction, a refrigeration cycle device which is communicated with the gas supply unit and used for cooling the natural gas and driving the natural gas to flow, and a natural gas hydrate preparation device which is connected with the refrigeration cycle device and used for preparing and storing the natural gas hydrate, wherein the refrigeration cycle device comprises a dryer, a compressor, a cooler and an expander; the inlet end of the dryer is communicated with the outlet end of the gas supply unit, and the dryer is used for drying the natural gas; the inlet end of the compressor is communicated with the outlet end of the dryer, and the compressor is used for sucking the natural gas and compressing the natural gas; the inlet end of the cooler is communicated with the outlet end of the compressor, and the cooler is used for cooling the natural gas; and the inlet end of the expander is communicated with the outlet end of the cooler, the outlet end of the expander is communicated with the natural gas hydrate preparation device, and the expander is used for expanding the natural gas to obtain low-temperature natural gas and sending the low-temperature natural gas into the natural gas hydrate preparation device. The compressor is connected with the expander through a coupling, and can recover expansion work to enhance the work applying efficiency of the system.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Frequency-adjustable wireless electric energy transmission device
ActiveCN103312048AEasy frequency adjustmentIncrease powerElectromagnetic wave systemCircuit arrangementsEngineeringMultistage amplifier
The invention discloses a frequency-adjustable wireless electric energy transmission device, which comprises an adjustable active crystal oscillator array, a multistage amplifier circuit, an energy emission system, an energy receiving system and a commutating and voltage-stabilizing matching system. As a signal source, the adjustable active crystal oscillator array is used for generating high-frequency small signals with different energy transmission frequencies; the multistage amplifier circuit is used for performing stage-by-stage amplification on the high-frequency small signals generated by the adjustable active crystal oscillator array to provide energy for the energy emission system; the energy emission system is used for generating a high-frequency electromagnetic energy field; the energy receiving system is used for receiving the high-frequency electromagnetic energy field generated by the energy emission system and converting the high-frequency electromagnetic energy field into high-frequency electric energy; and the commutating and voltage-stabilizing matching system is used for performing rectifying and voltage-stabilizing on the high-frequency electric energy converted by the energy receiving system so as to match with the electric energy required by a load. The frequency-adjustable wireless electric energy transmission device disclosed by the invention has the characteristics of strong frequency selectivity, simple operations and the like, and is a new breakthrough for a frequency-adjustable wireless electric energy transmission system to move towards engineering.
Owner:SOUTHEAST UNIV
Control moment gyro singularity avoidance method based on instruction moment vector adjustment
ActiveCN105388902AEasy to chooseSolve the "locked" problemCosmonautic vehiclesCosmonautic partsAttitude controlAngular velocity
A control moment gyro singularity avoidance method based on instruction moment vector adjustment comprises the steps of first acquiring a frame angular vector of control moment gyros, then calculating a Jacobian matrix, a singularity metric value and an instruction moment vector adjustment coefficient of a control moment gyro motion equation, next obtaining a control moment instruction adjustment vector and a zero motion singularity avoidance strength coefficient based on a control moment instruction given by an attitude controller, and finally obtaining a control moment gyro frame angular velocity instruction vector based on the control moment instruction adjustment vector and the zero motion singularity avoidance strength coefficient so as to control the moment gyro frame angular velocity. The invention overcomes the situation in which a moment instruction coincides with a particular direction thereof when a frame is "locked", thereby making separation impossible; solves the problem of a "locked" frame angle during singularity avoidance in the prior art; and achieves effective avoidance of the control moment gyro singularity.
Owner:BEIJING INST OF CONTROL ENG
Magnetic resistance type electromagnetic active vibration absorber
ActiveCN106286666AOverall small sizeSmall qualityVibration dampersMagnetic springsNoise controlStator coil
The invention belongs to the technical field of vibration noise control and particularly relates to an active vibration absorber. The magnetic resistance type electromagnetic active vibration absorber comprises a vibration absorber lower installation plate, a vibration absorber cover, a vibration absorber upper installation plate, a rotor assembly and a stator assembly. Four rolling guide rail pairs are installed between the rotor assembly and the stator assembly. The rotor assembly is connected with the vibration absorber lower installation plate and the vibration absorber upper installation plate through springs. The rotor assembly can freely vibrate through the rolling guide rail pairs. The magnetic resistance type electromagnetic active vibration absorber can be installed and used in combination with various types of passive vibration absorbers and can be arranged on a controlled object or a base at will, after a coil is electrified with alternating current, electromagnetic force is generated between the rotor assembly and the stator assembly, the stator coil generates Lorentz force, the resultant force of the electromagnetic force and the Lorentz force drives a vibration absorber rotor to move, the vibration absorption force generated by the vibration absorber rotor is used for offsetting the vibration of the controlled object, and the purpose of controlling vibration is achieved.
Owner:NO 719 RES INST CHINA SHIPBUILDING IND
Self-lifting type multifunctional ocean platform and work method thereof
ActiveCN105862696AEasy to integrateWide spaceArtificial islandsUnderwater structuresWell drillingCantilever
The invention discloses a self-lifting type multifunctional ocean platform and a work method thereof and belongs to the technical field of marine transportation and ocean engineering technology. The multiple functions of the platform are combined to realize well drilling, well repairing, household self-holding and small-scale drilling. The self-lifting type multifunctional ocean platform mainly comprises a platform upper-layer deck, a machinery deck, cylindrical pile legs, a crane, pile shoes, a helicopter deck, a fore body lateral pushing part, a derrick, a tail thruster, pile shoe containing zones, a pile driver slideway, an LNG tank body, a pile driver, a main machine and the like. The self-lifting type multifunctional ocean platform meets the existing ocean engineering development requirement, achieves various operations such as ocean platform well drilling, well repairing, household self-holding and small-scale drilling, has the all-weather operation capability and long self-holding capability and adopts a cantilever drilling mode and advanced pile leg lifting equipment, drilling equipment and generating equipment. The self-lifting type multifunctional ocean platform is higher in integration capacity, has the well drilling, well repairing and small-scale drilling capacities, has a broad deck space, is provided with a natural gas collecting and compression treatment device and a corresponding power system, and is economical, efficient and high in engineering applicability.
Owner:DALIAN UNIV OF TECH
Motor driven culvert lift fan gearing-down mechanism
InactiveCN102673783ASmall sizeMeet the space size requirementsVertical landing/take-off aircraftsRotocraftMotor driveGear wheel
The invention discloses a motor driven culvert lift fan gearing-down mechanism. A motor is placed in a symmetry plane of an airplane, a transmission shaft is horizontally arranged on a mode of being vertical to the symmetry plane of the airplane, the motor drives the transmission shaft through a gear reducer, two ends of the transmission shaft are coaxially connected with a bevel gear respectively, the bevel gears is vertical to and meshed with a bevel gear which is coaxially and fixedly connected with fans to drive the two culvert fans in wings to rotate. The motor driven culvert lift fan gearing-down mechanism overcomes twisting moment, can effectively decreases size of the bevel gears, obtains good aerodynamic efficiency, gives consideration to requirements for efficiency and weight, and is low in cost and strong in project applicability.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
INS/USBL combined navigation positioning method for AUV docking
ActiveCN108151733ARealize navigation and positioningReal-time docking path planningNavigational calculation instrumentsNavigation by speed/acceleration measurementsTransceiverLongitude
The invention relates to an INS / USBL combined navigation positioning method for AUV docking. The method comprises the following steps: putting a USBL transceiver and an INS into an AUV carrier, and placing a transponder at a docking port; setting two fixed points in a certain distance from the docking ports, hovering the AUV at the two points, acquiring longitude and latitude of a hovering point by using the INS, and acquiring the distance between the AUV and a transponder matrix by using the USBL; acquiring the position of the docking port according to the position of the AUV and the distancebetween the AUV transceiver and the transponder; planning a route according to the position of the docking port, and implementing navigation positioning of the AUV to the docking port. By adopting the INS / USBL combined navigation positioning method for AUV docking, precise positioning of the AUV to the docking port and real-time docking route planning can be achieved, the cost is low, good engineering applicability is achieved, and technical assurance can be provided for automatic docking and underwater butt joint of automatic underwater vehicles.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
Tracking-maintaining and orbit transfer method of on-satellite autonomous non-cooperative maneuvering target
ActiveCN108897023AStrong engineering applicabilitySimplify calculationSatellite radio beaconingSatelliteLinearization
The invention provides a tracking-maintaining and orbit transfer method of an on-satellite autonomous non-cooperative maneuvering target. A typical C-W equation serves as a relative motion model, a relative motion relation between a tracking spacecraft and the spatial non-cooperative maneuvering target is linearized, the computational complexity is reduced, and on-satellite autonomous computing isrealized on the premise that capability of on-satellite hardware equipment is limited. Capability constraint of the tracking spacecraft is taken into full consideration during design of tracking-maintaining and orbit transfer strategies, the maximal ignition time constraint and shortest time interval constraint between twice ignition of a thrust of the tracking spacecraft are introduced, so thatthe design method of the tracking-maintaining and orbit transfer strategies of the spatial non-cooperative maneuvering target is realized under engineering constraints fo the tracking spacecraft.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
Non-navigable span pier collision avoidance monitoring system and real-time diagnosis method
ActiveCN106248335AAccurately determine the extent of damageAccurate recordShock testingData acquisitionMonitoring system
The invention discloses a non-navigable span pier collision avoidance monitoring system and a real-time diagnosis method. The system comprises sensors mounted on a bridge A, a bridge B and a bridge pier respectively, a data acquisition instrument and a data denoising instrument and the like. The monitoring system can realize online real-time monitoring of bridge pier ship collision, can directly and quickly carry out preliminary judgment on bridge damage degree in the first time of bridge pier ship collision, and can directly analyze impact force and important bridge pier structure reaction parameters and provide first-hand data support for bridge operation close, immediate maintenance decision, bridge pier component state assessment and damage identification; the monitoring system is reasonable in design principle, light in structure and high in impact force identification precision; the whole monitoring system is low in cost, and can be largely applied to the cross-sea and cross-river bridges without increasing engineering construction cost too much, thereby solving the problem of high cost of omnibearing collision avoidance monitoring; and the monitoring system is high in engineering applicability.
Owner:ZHEJIANG UNIV OF TECH
Ice melting power triangle based ice coating lead ice melting current obtaining method
The invention discloses an ice melting power triangle based ice coating lead ice melting current obtaining method and belongs to the technology of ice melting of an ice coating lead. The ice melting power triangle based ice coating lead ice melting current obtaining method aims at solving the problems that the engineering applicability is not strong due to the fact that the error of the existing calculation method of ice melting power and ice melting currents is large. The ice melting power triangle based ice coating lead ice melting current obtaining method comprises the following steps of firstly establishing an ice melting power triangle; enabling power P required for ice melting to be equivalent to a sum of an ice coating absorption power Pr and wasted power Ps of other parts; calculating the ice melting power under different set ice melting time; calculating ice melting ice currents. The ice melting power triangle based ice coating lead ice melting current obtaining method can describe a relationship between the ice melting power P and an ice coating parameter with high accuracy, is simple in parameter calculation, enables the calculation error to be smaller than 10%, is strong in engineering applicability and is applicable to ice melting and ice proof of the ice coating lead.
Owner:STATE GRID CORP OF CHINA +3
Method of curing soil body through motivating and cultivating microorganism in situ
InactiveCN111501733AReduce penetrationThe hydrolysis mechanism is simpleCoastlines protectionExcavationsMicroorganismSoil science
The invention discloses a method of curing a soil body through motivating and cultivating microorganism in situ. The method comprises the following steps: at first, adding motivating liquid in the soil body to promote reproduction of microorganism in the soil body, then, adding cementing liquid in the soil body to cure the soil body, and further, calculating the usage amount of the motivating liquid and / or cementing liquid added each time through the porosity, the treatment area and the treatment depth of the soil body. Through adding the motivating liquid in situ, reproduction of self microorganism in the soil body is promoted; the in-situ motivated microorganism in the soil body environment is balanced in nutrient substances, has interactive adjustment and sensing with other microorganism, grows and breeds rapidly and is high in urease activity; and in addition, the in-situ microorganism motivating method reduces the process of adding bacteria solution in the soil body, greatly reduces the influence of non-uniform solution flowing to non-uniform microorganism distribution and effectively improves the MICP effect.
Owner:NANJING UNIV +1
Automatic refueling method and system for circulating fuel management
ActiveCN105843178AEasy to manageConvenient fuel managementProgramme total factory controlNuclear engineeringInformation exchange
The invention discloses an automatic refueling method and system for circulating fuel management, and the method comprises the steps: carrying out the initialization of the system; receiving the information transmitted by a reactor core program; enabling a part of a reactor core to be reduced to a full reactor core according to the received information through a reactor core reduction strategy; analyzing the former circulation position of a refueling assembly, and adjusting the distribution position of segments in the refueling assembly through employing an assembly rotation strategy; carrying out refueling through exchanging the internal information of the refueling assembly according to the inputted refueling information; uploading the arrangement of the reactor core after refueling to the reactor core program, and forming a reactor core model for next circulation, so as to carry out the subsequent circulation calculation. According to the embodiment of the invention, the method does not exert any constraint on the type of the reactor core, is suitable for the calculation of reactor cores of any type, reads the refueling arrangement of all circulating reactor cores through building each circulating burn-up end database, can achieve the multi-circulation automatic refueling reactor core calculation, provides convenience for fuel management, and is good in engineering applicability.
Owner:STATE POWER INVESTMENT CORP RES INST
Damping pipeline system based on friction energy dissipation
PendingCN109944983AStrong engineering applicabilityWide range of applicationsPipe supportsPipe elementsStructural elementEngineering
The invention discloses a damping pipeline system based on friction energy dissipation and belongs to the technical field of structure damping engineering. The damping pipeline system comprises a pipeline, an inner pipe clamp, a friction energy dissipation layer, an outer pipe clamp and damping supports. The inner pipe clamp is fixed to the pipeline through bolts. The friction energy dissipation layer is arranged between the inner pipe clamp and the outer pipe clamp. The pipeline system is fixed to a structural element through the damping supports. Under an earthquake load, the damping supports provide supporting rigidity for the pipeline system, a friction energy dissipation material serves as the damping energy dissipation layer of the pipeline system and dissipates input earthquake energy, the earthquake acceleration of the pipeline system is decreased, and earthquake internal force of the pipeline system is reduced. The damping pipeline system is simple in structure, convenient touse, low in cost, remarkable in damping effect, and capable of reducing the earthquake internal force of the pipeline system as well as isolating influences of power pipeline vibration on the structural element.
Owner:武汉地震工程研究院有限公司
High temperature pressure measurement method and sensor for impulse knocking engine based on ion current
InactiveCN101319953ASimple structureLow costEngine testingRapid change measurementEngineeringTemperature resistance
The invention relates to a high temperature pressure measuring method and a sensor for a pulse detonation engine based on ion current. The method includes as follows: when a detonation engine burns, a plurality of free electrons and ions exist in an induction area in the detonation waves; an ion probe is adopted and a stable bias voltage is applied at the poles of the probe to form a continuous ion current in a measuring current; the attenuation speed of the current has linear relation with the pressure in a detonation tube; the pressure in the detonation tube is obtained according to the attenuation speed of the ion current. The sensor has characteristics in the structure that the anode of the sensor is inserted into a high temperature ceramics insulating tube and then is inserted into a screw cap together with the high temperature ceramics insulating tube. The screw cap is arranged in the tube wall of the detonation engine; a silicon gel seal layer is arranged above the screw cap; a stable power is directly applied between the anode and the screw cap. The device has the advantage of high temperature resistance, impact resistance, simple structure, convenient mounting and maintaining and low cost; besides, the device is applicable for the pressure measuring of the pulse detonation engine under the high temperature environment.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Vibration fatigue theory based method for analyzing failure mode of inertia measurement system
ActiveCN104154933AStrong engineering applicabilityAdded Vibrational Spectrum FeaturesTesting/calibration of speed/acceleration/shock measurement devicesFrequency spectrumTheory analysis
The invention discloses a vibration fatigue theory based method for analyzing failure mode of an inertia measurement system. The method is as below: first, the vibration spectrum of a vibration source in an inertia device during working is detected, so as to obtain full spectrum information of vibration energy transmission; combined with the structural mode of internal composition, micro working state of each composition within the inertia device can observed, and fault points of each composition of the inertia device can be diagnosed accurately. The invention has the advanategs of intuitive characterization, simple operation and high detecting precision, and can effectively realize fault prediction and positioning of inertia device at the whole machine level. The invention is applicable to the evaluation of failure mode of any system containing vibrational excitation.
Owner:BEIJING INST OF AEROSPACE CONTROL DEVICES
Method for measuring torsional vibration of shafting
ActiveCN103925988AStrong engineering applicabilityAccurate measurementSubsonic/sonic/ultrasonic wave measurementUsing electrical meansElectricityEddy-current sensor
The invention provides a method for measuring the torsional vibration of shafting. A measured gear is mounted on a measured gear shaft, an electrical vortex sensor is axially mounted on the side face of the measured gear, the electrical vortex sensor is parallel to the axis of the measured gear, and a probe of the electrical vortex sensor aligns to the position of a reference circle. After the measured gear shaft and the measured gear rotate, each tooth of the measured gear passes through the electrical vortex sensor, the electrical vortex sensor measures one pulse signal, and meanwhile a pulse width is recorded. The instantaneous angular velocity of the measured gear is acquired through the pulse width, the instantaneous angular velocity is drawn to be an instantaneous angular velocity curve, the instantaneous angular velocity curve is integrated, and therefore the angular domain curve of the torsional vibration of the measured gear is obtained. According to the method for measuring torsional vibration of shafting, the sensor is mounted in the axial direction, so that measuring errors caused by gear tooth face machining errors are avoided, the roughness of the top surface of each tooth is not required, the engineering applicability is high, and a measuring result is more precise.
Owner:HARBIN ENG UNIV
Broadband transconductance enhanced low-noise amplifier
InactiveCN112653397AStrong engineering applicabilityEasy to enterAmplifier modifications to reduce noise influenceCapacitanceLow noise
The invention belongs to the technical field of communication, and provides a broadband transconductance enhanced low-noise amplifier which is used for solving the problems that an existing traditional gm-boost low-noise amplifier is narrow in bandwidth, and gain and noise cannot meet design requirements. A three-stage structure of a first-stage differential amplifier, a second-stage differential amplifier and a third-stage neutralizing capacitor amplifier is adopted, the two-stage differential amplifier is designed on the basis of a gm-boost structure, compared with a traditional gm-boost structure, the structure has the advantages that the input mode is improved, source input is changed into grid input, gain and isolation are increased, input impedance of the amplifier is changed gently, a large bandwidth can be obtained through matching, meanwhile, noise can be reduced, and ultra-low noise is achieved through the two-stage differential amplifier and optimal noise matching; moreover, the bandwidth of the low-noise amplifier is effectively expanded through the differential structure design of the two-stage differential amplifier, the input, the output and the inter-stage transformer matching, and the peak shifting design of the three-stage amplifier.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method for measuring ultimate heap capacity of building rubbish heaping slope
ActiveCN106096169AHigh precisionReliable design principleGeometric CADSpecial data processing applicationsLandslideEngineering
The invention relates to a method for measuring the ultimate heap capacity of a building rubbish heaping slope. The method comprises the following steps that firstly, grading loading-increasing intensity of the heaping type slope and related slope body parameters are determined; secondly, the grading loading-increasing pressure distribution area and loading-increasing pressure values of the heaping slope are determined; thirdly, slope heaping displacement monitoring point distribution and layering heaping displacement change values are determined; fourthly, slope body heaping displacement modulus ratio parameters and stability criteria of the slope are determined; fifthly, the ultimate rock and soil heap capacity mcr of the slope body is determined; sixthly, the safety heap capacity mk of the slope body is determined. According to the method, a set of effective method for calculating the ultimate heap capacity of slope slippage slope body for evaluating the stability and accuracy of the slope is provided, and existing theoretical calculation system methods for landslides are supplemented. The method is reliable in design principle and has the advantages that the precision of calculation results is high, and implementation is easy; the cost is saved, the engineering applicability is high, and the application range is wide.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY
Method for broken-line aircraft approach guidance through microwave landing system
ActiveCN109540153ASolve the problem of elevation deviation errorMeet the needs of landingNavigational calculation instrumentsBeacon systemsMicrowave landing systemMicrowave
The invention discloses a method for broken-line aircraft approach guidance through a microwave landing system. The method comprises the following steps: establishing an airport landing point rectangular coordinate system, wherein the rectangular coordinate system is established with an airport landing point serving as an original point, the central line of a runner serves as the X axis of the coordinate system, the direction to the tail end of the runner serves as a positive direction, the Y axis and the X axis are located on a same horizontal plane, and the Z axis is directed to the sky; acquiring orientation, elevation and distance information of an aircraft during broken-line aircraft approach; and carrying out staged landing guidance through the microwave landing system according to aplanned flight route, wherein the intersection of an extension line of a selected glide angle of the aircraft in each stage and the X axis or the Y axis serves as a virtual landing point of the corresponding stage, and elevations of the aircraft relative to the virtual landing points are calculated, which are then reported, together with information of orientations and distances of the aircraft relative to the airport landing point, to a pilot and a flight control system for reference. The method is provided for the broken-line aircraft approach guidance through the microwave landing system,is applicable to an aircraft approach scenario with a fixed landing flight route, and particularly meets the requirements of autopilot landing or unmanned aerial vehicle landing.
Owner:西安合众思壮防务科技有限责任公司
Measurement method of thickness of subsurface damaged layer of bucky optical material
InactiveCN101672625BHigh precisionStrong engineering applicabilityPreparing sample for investigationUsing optical meansCorrosive chemicalMagnetic current
The invention discloses a measurement method of the thickness of a subsurface damaged layer of a bucky optical material. The measurement method comprises the following steps: processing the surface of a sample by a magneto rheological process to form a specific cutting plane; cutting the subsurface damaged layer and reflecting a subsurface damage to the cutting plane; processing the cutting planewith a corrosive chemical agent to expose and amplify subsurface cracks on the cutting plane; measuring roughness values of different positions on the cutting plane by a roughness measurement tool toobtain a roughness value change curve; working out a height difference between a critical point or a climax and a starting point recorded in measurement process, or a height difference between two points projected on an original surface, i.e. the thickness d of the subsurface damaged layer of the sample, wherein the critical point or climax to level off is obtained from a roughness curve by the data processing. The measurement method can quickly and accurately measure optical samples of multiple surface shapes and multiple materials and can realize heavy-calibre and engineered application.
Owner:XI AN JIAOTONG UNIV
Process for improving dewaterability of excess biochemical sludge
ActiveCN103992015APromote rapid proliferationImprove sludge settling performanceSludge treatment by de-watering/drying/thickeningChemistrySewage
The invention discloses a process for improving the dewaterability of excess biochemical sludge. The process comprises the following steps: placing the excess biochemical sludge and sewage according to the volume ratio of 2:1 to 1:2 in a continuous stirring reactor, reacting for 5 to 7 days at a temperature of 20 DEG C to 30 DEG C and under the stirring speed of 60r / min to 80r / min and carrying out hydrolytic acidification until pH is between 3 and 4; regulating the pH of the sludge water subjected to the hydrolytic acidification by using at least one material of Na2CO3, NaOH or NaHCO3 so as to reach 6.8 to 7.2; inoculating the sludge water with pH regulated with anaerobic granular sludge, placing in an anaerobic fermentation tank and carrying out anaerobic fermentation treatment for 5 to 8 days by controlling the temperature within 33 DEG C to 37 DEG C so as to obtain the fermented sludge. Based on the method with the combination of the sludge, the sewage acidification and the anaerobic fermentation of the granular sludge, the dewaterability of the excess sludge is improved; the treatment efficiency is improved; the reaction period is shortened; the secondary pollution is avoided.
Owner:知和环保科技有限公司
Device for real-time measurement of deep horizontal displacement and surface settlement of soil
PendingCN108534730AEasy constructionSimple designHeight/levelling measurementUsing optical meansFiberData analysis system
The invention discloses a device for the real-time measurement of the deep horizontal displacement and surface settlement of soil. The device comprises a displacement measurement sensor, a distributedoptical fiber demodulating device and a data analysis system. The displacement measurement sensor comprises a monitoring rod, a U-shaped optical fiber in the whole arranged on the monitoring rod, anda settlement measurement sensor arranged at an upper end part of the monitoring rod. The monitoring rod includes a measuring rod with a tip at a bottom and an elongated rod screwed to the upper partof the measuring rod. One end of the optical fiber is connected to the distributed optical fiber demodulating device, and the data analysis system is connected to the distributed optical fiber demodulating device. Compared with the traditional monitoring technology, the technology of the invention has the advantages that drilling is not needed, the measuring rod is vertically punched into the soilsection by section by using a static load extrusion method, the construction is convenient and rapid, the monitoring rod and the optical fiber can be recycled and reused after a project is finished,the design is simple, settlement monitoring and horizontal displacement monitoring are integrated into one body, the measuring speed is fast, the display is visual, and the engineering application ishigh.
Owner:KUNSHAN CONSTRUCT ENG QUALITY TESTING CENT
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