39results about How to "Relaxed precision requirements" patented technology

The invention belongs to the field of intelligent distribution networks, and relates to a related communication technology in a recording fault indicator, in particular to a synchronous sampling method based on short-frequency wireless in a transient recording fault indicator. A collecting unit in a three-phase line is started, a gathering unit sends a synchronous timing command to the collectingunit, the timing command includes a timing label, and the gathering unit can find the corresponding absolute time according to the label; the collecting unit receives the timing command, and performssupplementation point and zero clearing processing through timing collection of values of a counter to allow the counter to eliminate the error caused by the crystal oscillator and maintain the three-phase synchronous collection. The method adopts the wireless communication technology and the synchronous command to achieve the interaction between the line gathering unit and the collecting unit toreduce the power consumption of the device, save the hardware cost, reduce the requirements for accuracy and stability of the crystal oscillator, and ensure the simultaneous sampling between line status monitors.

The invention discloses a sectioned bag cage which comprises multiple connected bag cage sections. A clamping groove is formed in one of any two adjacent bag cage sections, and a clamping hook which can extend into the clamping groove to be clamped with the clamping groove so as to achieve connection of the two bag cage sections is arranged on the other of the two adjacent bag cage sections. In the sectioned bag cage, hook-groove structures are adopted replace elastic clamps so as to achieve connection of the bag cage sections, the phenomenon of filter bag puncture caused by drop of the elastic clamps is fundamentally avoided, and normal work of the sectioned bag cage is ensured. In addition, in the mode that the bag cage sections are connected by adopting the hook-groove structures, the accuracy requirement for matching sizes of the connecting positions of the upper and lower bag cage sections is greatly loosened, the manufacturing accuracy of connecting members is also reduced, the clamping grooves and the clamping hooks are both fixed to the bag cage sections, integration of the bag cage sections and the connecting members is achieved, and the connecting stability can be better. Furthermore, free-hand installation can be also achieved without special installing tools, and mounting and dismounting operation are more convenient. The invention further provides a bag type dust collector provided with the sectioned bag cage.

In a carbon nanotube for an electron emission source, the carbon nanotube has a cylindrical shape formed from a plurality of graphite layers. The graphite layer is made of a six-membered ring of carbon. The outer diameter of the cylinder is 0.6 to 100 nm. The diameter of a hollow portion formed along the axis of the cylinder is 0.1 to 0.9 times the outer diameter of the cylinder. The hollow portion has an open distal end portion.

The invention relates to a universal flexible multi-functional coupling, which comprises two half coupling taper sleeves and a middle section, wherein the middle section comprises three jointing plates, an adjustable slip joint and a universal joint; the adjustable slip joint comprises a mandrel and a shaft sleeve sleeved on the mandrel; key slots are correspondingly reserved at the internal axial position of the shaft sleeve and the external axial position of the mandrel respectively; the shaft sleeve and the mandrel are fixed by slip keys in the key slots; the joint plate I is connected with a flange plate on the end part of the shaft sleeve; the flange plate at one end of the universal joint is connected with that on the end part of the mandrel; the flange plate at the other end of the universal joint is connected with the jointing plate II; the jointing plates II and III are connected; and the two half coupling taper sleeves are connected to the outsides of the jointing plates I and III respectively. The coupling has the advantages of great axial and angular compensation, high fatigue-durable torque, high-temperature resistance without deformation, high flexibility, low amplitude, low noise, short assembly and disassembly time, long service life and the like, and is the multifunctional coupling with high comprehensive performance.

The invention discloses a 3D stacked and back exported fan-out type packaging structure and a manufacturing method thereof. The fan-out type packaging structure comprises a carrier plate (wafer), a chip, a plastic packaging layer, a first rewiring layer, a first dielectric layer, a second rewiring layer and a second dielectric layer. According to the fan-out type packaging structure, double-sided fan-out is realized, the packaging cost can be effectively reduced, and the application range of the structure is widened; the structure mainly depends on the design of the substrate to realize interconnection and intercommunication of the front surface and the back surface of the chip instead of TSV through holes, so that the process difficulty can be effectively reduced, and processing and production can be realized by using general equipment; besides, the fan-out type packaging structure can shorten the connection distance, has great advantages in the aspects of product performance, especially electrical performance and signal transmission, and is smaller in loss, higher in efficiency and shorter in response time.

The invention discloses a turbomachinery aerodynamic performance-blade load optimization method based on machine learning, and the method comprises the steps: determining a turbomachinery working fluid, carrying out the parameterization of a turbomachinery, obtaining an optimization process input variable and an optimization target, and determining the empirical design space of the input variable; performing Bayesian optimization sampling on the turbomachinery in the empirical design space of the input variable according to the optimization target, selecting a working fluid in the optimization sampling process, calculating to obtain an optimization target value, and storing all Bayesian optimization sampling data; constructing a Unet-CNN neural network, and carrying out network training; performing random sampling on optimization process input variables in an empirical design space, constructing a geometric model to perform unsteady CFD calculation, performing post-processing to obtain a high-performance test set and a low-performance test set of the Unet-CNN neural network, and testing the Unet-CNN neural network; and enabling the Unet-CNN neural network passing the test to be used for turbomachinery optimization, and obtaining the optimal turbomachinery structure. According to the method, the cost and time consumption for constructing the proxy model can be greatly reduced.

The invention relates to a binding steel bar connecting assembly and a connecting method applied to PC component assembly, and belongs to the field of construction engineering. The binding steel bar connecting assembly is formed by closely enclosing the ends of two butt-jointed steel bars with a combined-type inner layer sleeve core, a combined-type middle layer sleeve and an outer sleeve hoop layer; the inner layer sleeve core is composed of two pairs of semi-circular tubes which are correspondingly fastened to the ends of two butt-jointed steel bars, wherein each semi-circular tube is less than or equal to 1/2 of a circle, and grooves are formed in the inner sides of the semi-circular tubes, wherein the grooves coincide with oblique transverse thread flanges on the outer surfaces of thebutt-jointed steel bars; the middle layer sleeve is combination pipe with vertical seams and variable cross sections, the combination pipe is defined by arc-shaped plate strips which are divided intothree-four equal parts in the circumferential radial direction, the inner diameter of the combination pipe is equal everywhere, and the outer diameter is reduced from the middle section to both ends;outer layer sleeve hoops are a pair of taper sleeves, wherein each of the inner diameter gradients of the taper sleeves is matched with the outer diameter gradient of the middle layer sleeve, and thetaper sleeves can be sleeved with the two ends of the middle layer sleeve; the distance between the two sleeve hoops is forcibly shortened by special tools, and the inner diameter of the combined-typemiddle layer sleeve is enabled to be reduced, so that the friction and the bond stress at the end of a steel bar are obtained, and thus an effective steel bar joint is obtained.

The invention relates to a system for measuring inertial navigation by using a big dipper and a method for installing an included angle by a tachymeter, which are suitable for a combination navigation system formed by a big dipper receiver, an inertial navigation system and the tachymeter, and belong to the technical field of combination navigation. The technical key points are characterized in that 1) establishing a relation model of installation included angle and the tachymeter path increment error, accurately modeling an observation matrix; 2) according to the speed output of the big dipper receiver, calculating the carrier position increment which is used for constructing the observed value of the combination navigation system; and 3) employing a closed loop feedback updating mode, and realizing the rapid and accurate estimation of the inertial navigation system and the tachymeter installation included angle. By combining the big dipper receiver and the inertial navigation system information, compared with the single usage of the big dipper receiver or the inertial navigation system, the output information with higher precision can be obtained, so that the measurement of the installation included angle can be rapidly and accurately measured.

The invention discloses a machining technology of a high-precision constant pressure valve. The high-precision constant pressure valve has a set pressure value p. The machining technology comprises the following steps that firstly, pressure is applied to a pressure spring to enable the pressure on a unit area of the pressure spring to reach the pressure value, the length of the pressure spring after being compressed is measured, then a pressure spring hole is machined by a pressure spring hole depth processing device to enable the depth of the pressure spring hole to correspond to the length after being compressed, the pressure spring is placed in the pressure spring hole, and then the assembly of the high-precision constant pressure valve is completed by assembly equipment. The inventionfurther discloses a high-precision constant pressure valve production line. The machining technology and the high-precision constant pressure valve production line improve the constant pressure precision and yield of the constant pressure valve.

The invention discloses a signal reception equalization processing method. The method is characterized by carrying out sample and hold on an input signal under a sampling clock to obtain four groups of signals: s[n-3],s[n-2], s[n-1] and s[n], wherein the s[n-3] and the s[n-2] are absolute values of a negative voltage to earth level of the input signal, the s[n-1] and the s[n] are absolute values of a positive voltage to earth level of the input signal; the earth potential is determined to be one point p in input signal normalization amplitude, with 0<=p<=1; and the sampling clock frequency is twice as large as the signal frequency; and carrying out equalization and insertion calculation on the four groups of signals simultaneously in the above process to obtain insertion data d[n]. The s[n] which is a current signal passes through four switch capacitor sets which are controlled by four sampling clocks: clk[n-1], clk[n-2], clk[n-3], clk[n-4], and sampling is carried out when the sampling clocks are in high level. The signal reception equalization processing method effectively reduces the precision requirement of a later-stage analog-to-digital conversion circuit and reduces the area and power consumption of the analog-to-digital conversion circuit.

The invention discloses an RGB LED integrated packaging module, comprising a substrate and at least three groups of light emitting groups arranged on the substrate, wherein each light-emitting group comprises a first light-emitting unit and a second light-emitting unit; the first light emitting unit comprises a first red wafer, a first green wafer and a first blue wafer. The second light emittingunit comprises a second red wafer, a second green wafer and a second blue wafer. Six light emitting units in the three groups of light emitting units are integrated, and then the six independent light-emitting units are combined into an LED integration module, and meanwhile, the first red wafer, the first green wafer, the first blue wafer, the second red wafer, the second green wafer and the second blue wafer in the same group are connected in parallel through a common negative circuit or a common positive circuit, and then are connected with the first same-color wafers and the second same-color wafers between the groups, so that the connection pins can be reduced to the maximum extent and the tin loading area can be reduced, and the SMT chip mounting efficiency can be improved; and meanwhile, the packaging structure is simplified.

One aspect of the present disclosure relates to a method for determining a background shift, the method including obtaining a plurality of sets of optical measurements of a sample taken by the analyzer for samples at different points in time, each set including at least one measurement taken in a first channel and another measurement taken in a second channel different from the first channel, theplurality of sets of optical measurements including one group of sets and another group of sets, the measurements in the one group of sets showing a higher signal change than the measurements in the other group, determining a first background signal based on a relation of measurements in the first and second channels in the one group, determining a second background signal based on a relation of measurements in the first and second channels in the one group and the other group and determining a background shift based on the first and second background signals.

The invention discloses a pre-coated membrane which comprises a base membrane, an ultrafiltration layer and a water-permeable supporting layer which are sequentially laminated, the base film is a plastic film; the water-permeable supporting layer is thicker than the ultrafiltration layer; the ultrafiltration layer is composed of a resin coating, and inorganic nanoparticles are uniformly distributed in the resin coating; the permeable supporting layer is composed of a resin coating, and inorganic particles are uniformly distributed in the resin coating; the particle size of inorganic particles in the water-permeable supporting layer is larger than that of inorganic nano-particles in the ultrafiltration layer. The method can be used for manufacturing the nanometer water filtering layer with the thickness smaller than 0.1 micrometer, the thickness deviation range can be controlled within +/-10%, and the ultra-thin degree and the thickness precision of the nanometer water filtering layer are far better than those of a traditional technology. According to the water purification product manufactured by the invention, the blockage of impurities in water can be greatly reduced, and the backflushing cleaning can be carried out in a shorter time and at a lower backflushing water pressure, and less backflushing sewage can be generated.

The invention relates to the technical field of angle measurement, and provides a laser angle measurement device and method. The device comprises an optical interference module, a detection module, aphase feedback control module and a signal extraction module, the optical interference module divides the incident laser into a transmission laser and a reflection laser, and the reflection laser andthe transmission laser after reflection are converged to obtain a third laser; the detection module measures the light spot intensity and the spatial position information of the third laser; the phasefeedback control module controls the optical interference module to change the phase difference between the transmitted laser and the reflected laser according to the light spot intensity; the signalextraction module calculates the deflection angle of the incident laser according to the spatial position information of the third laser spot based on the weak value amplification principle. According to the invention, the offset of the light spot at the detection end is amplified, so that the measurement sensitivity is improved, the requirement on the precision of the detector is lowered, and the high-precision detection performance can be obtained by using a low-precision detector.

The invention discloses a connecting piece for a steel-concrete composite structure and a construction method. The connecting piece comprises an inverted-cone nut, a screw, an elastic sleeve and a nut, the minimum end of the inverted-cone nut is connected with one end of the screw, the other end of the screw is connected with the nut, the elastic sleeve is connected to a rod body of the screw in a sleeving mode, and the elastic sleeve is positioned between the inverted cone nut and the nut; the elastic sleeve comprises an elastic steel plate, and the elastic steel plate surrounds a rod body of the screw and is wound by at least three circles to form the sleeve. According to the connecting piece, the nut is screwed down, so that the elastic sleeve is squeezed and pushed by the inverted-cone nut, the diameter of the elastic sleeve is increased, the anchoring effect is generated, the inverted-cone nut provides the anchoring effect, the elastic sleeve increases the vertical tension of the screw and bears certain tension, the pulling resistance of the connecting piece is improved, and the shear strength and the shear rigidity of the connecting piece are improved through the screw; the connecting piece has anti-pulling and anti-shearing performance.