21 results about "Linear density" patented technology

The invention relates to a meshbelt structure simulation method with heterogeneous left and right selvedges based on parameterized segmented modeling, which comprises the following steps of: deconstructing a meshbelt into three heterogeneous functional areas of left overlock, middle main body and right connection, and independently controlling by adopting a Bezier curve, a composite wave equation and a catenary fusion model respectively; the synchronous accurate expression of the closeness of the left side overlock coil, the warp and weft interweaving stability of the main body and the mechanical rationality of the right side U-shaped connection is realized, and the problem of geometric distortion caused by unified modeling in the prior art is solved. According to the method, a cross-scale coupling equation of tension (T), a friction coefficient (mu) and linear density (rho) is introduced, and a closed-loop mapping relation of technological parameters, geometrical morphology and mechanical response is established. For example, when the tension of the braid is increased, the curvature radius of the U-shaped connecting part is automatically reconstructed according to a formula, so that parameter regulation and control are upgraded from experience trial and error to intelligent optimization of physical driving.

A filter plate subframe for a filter plate frame assembly having a filter plate frame and a filter plate subframe slidably receivable therein. The subframe comprises separate periphery segments attached to each other so as to form a continuous, generally rectangular periphery region with flank sides and end sides. The flank sides have a linear density lower than that of the end sides, and the end sides have a bending stiffness higher than that of the end flank, while either or both of the first end side and the second end side are provided with a reinforcement bar for increasing the bending stiffness said end sides. A supporting surface is provided on a first planar side of periphery segments forming the flank sides the supporting surface.

The invention discloses a gold mine mining parameter optimization method and device based on digital twinning and a medium, and relates to the technical field of mining engineering.The gold mine mining parameter optimization method comprises the steps that a high-fidelity digital twinning body is constructed, a micro-proxy simulator is established, and an initial twinning log is generated; recording the combined observation three-channel and twinborn state in the initial twinborn log; a posteriori parameter set is used as a priori, hierarchical multi-objective optimization of opportunity constraint is executed under accelerated evaluation of a microagent simulator to obtain a gold mine mining parameter set, and a version package is generated; and implementing staged issuing and operation instruction mapping by using the version package, and writing back records of combined observation of three channels and twin states to form a new round of initial twin logs. According to the method, a posterior parameter set containing a confidence boundary is output under weight constraint and consistency check by using combined likelihood robust online inversion, so that charge linear density, detonation delay segmentation, rock mass equivalent strength and joint parameters are prompted to rapidly and stably converge and are used as reliable input of opportunity constraint layering multi-objective optimization.

The invention relates to the technical field of melt direct spinning, in particular to a melt direct spinning powder adding device which comprises a supporting frame, a container is fixedly connected to the inner bottom of the supporting frame, a second barrel is arranged in the supporting frame, a first barrel is arranged at the bottom of the second barrel, and a filter screen is fixedly connected into the second barrel. According to the melt direct spinning powder adding device, cakes, impurities and ultra-coarse particles mixed in powder can be efficiently intercepted, and the foreign matter is prevented from entering the follow-up spinning link. If impurities enter a spinning assembly along with a melt, spinneret orifices are easy to block, and broken filaments, broken filaments and the like are caused, the purity of powder can be improved to 99.5% or above through pre-screening and secondary filtering, the defective product rate of the subsequent spinning procedure is directly reduced, and the linear density uniformity and the mechanical property stability of finished fiber are ensured.

The present invention discloses a system and method for detecting the absolute linear density of a grating, belonging to the field of optical detection technology. By adding the functions of incident light wavelength modulation and wavelength monitoring, different diffraction angles at the same position of the grating are obtained by adjusting the wavelength of the incident light, thereby determining the absolute linear density at that position. Without changing the wavelength of the incident light, the relative detection accuracy of the LTP for the grating linear density is dN / N=5×10 ‑7 The present invention can achieve absolute detection of each position by only changing the wavelength of the incident light once, thus ensuring detection efficiency. After theoretical analysis and actual testing, the present invention has achieved an absolute detection accuracy of grating line density of dN / N=1×10 ‑6 .

The invention discloses an adjustable preparation method of nylon-6 silk yarn with high evenness in the technical field of special yarn spinning, which comprises a spinning system, silk yarn of different raw materials can be blended and uniformly mixed through the spinning system, and the silk yarn with different characteristics can be spun through the process equipment and method, so that the production efficiency is improved, and the production cost is reduced. Meanwhile, various special-shaped silk threads can be rapidly cooled through circular blowing, lateral blowing is slow and uniform, vertical blowing is high in speed, the silk threads can be rapidly condensed and cured, meanwhile, in the spinning process, different master batch raw materials are conveniently added, the proportion of the master batch raw materials to slices is adjusted, and the spinning quality is improved. In the whole spinning process, the cooling effect of the device is more suitable for the silk threads added with inorganic raw materials, the situation that the silk threads are even in line dryness and even in dyeing can be effectively improved, and the device can be more suitable for the shaping effect of the silk threads added with the inorganic materials through cooperation of the silk drawing roller, the shaping roller and the tensioning roller.

The application discloses a precise weight fixing method for continuous casting square billets based on cross-section multi-region temperature-density coupling, establishes a coordinate system with the geometric center of the cross-section of the continuous casting square billet as the origin, divides the square billet cross-section into a plurality of characteristic temperature regions based on the radial distance of the polar coordinate, and calculates the effective area weight of each characteristic temperature region; the internal temperature of each characteristic temperature region at the cutting position of the continuous casting square billet is calculated by using the real-time surface characteristic temperature of the continuous casting square billet and through a nonlinear regression model; the real-time high-temperature density of each characteristic temperature region is calculated by using a machine learning density prediction model according to the real-time element composition data of the molten metal for casting the continuous casting square billet and the internal temperature of each characteristic temperature region; the reference predicted linear density of the continuous casting square billet is calculated according to the real-time high-temperature density and the effective area weight of each characteristic temperature region; and the cutting length of the continuous casting square billet is determined according to the reference predicted linear density and the target weight of the continuous casting square billet.

The present application relates to a kind of precision matching tunneling blast hole variable density charge design method, comprising the following steps: face three-dimensional scanning and preliminary blasting design, drilling construction and lithology parameter acquisition, charge density calculation parameter determination, charge segmentation and linear density calculation, variable density charge and initiation;Compared to the variable density charge technology in the prior art lacks the fine density matching of blast hole, leading to the demand mismatching of explosive energy release and rock breaking, exacerbating the vicious cycle of overbreak and underbreak, and the problem of poor blasting effect, the charge density calculation of the present application integrates overbreak and underbreak distribution data, blast hole type, rock firmness coefficient, blast hole geometric parameter, realizes the double density matching of hole difference + intra-hole segmentation, ensures that explosive energy release and rock breaking demand accurately match, significantly reduces the overbreak and underbreak incidence, and the blasting effect is better.

The application discloses a kind of derrick hoisting system and coal handling trestle resonance processing method, comprising: a. using optical vibration measurement method to obtain the basic frequency characteristic of derrick hoisting system or coal handling trestle, that is, string vibration natural frequency, string vibration natural frequency includes first-order natural frequency, denoted as f x1 ; b. the natural frequency of derrick hoisting system or coal handling trestle is calculated using finite element model, the natural frequency of first-order vibration, i.e. fundamental frequency is calculated;In the shutdown state of derrick hoisting system or coal handling trestle, the dynamic characteristics of building structure are tested using transient impact excitation method or natural environment excitation method, and the calculation results of the fundamental frequency of the structure are verified by experiment;And determine the natural frequency fundamental frequency interval of building structure, and c. according to =, wherein L is the length of the string, T is the tension of the string, and δ is the linear density of the string, by changing the effective length of the string in the derrick hoisting system and coal handling trestle, the natural frequency of the string is changed, so that, thus eliminating resonance.

The invention discloses an analysis model for judging influence of in-hole foreign matters on a concrete dam normal vertical line and a positioning method. Aiming at the technical defects that an existing manual displacement resetting method is high in omission factor and cannot accurately position a foreign matter touch position and the like, a normal vertical line natural vibration frequency analysis model is established based on a string vibration theory, and the equivalent length of a vertical line is calculated by exciting the vertical line and measuring the first-order natural vibration frequency in combination with steel wire tension, linear density and a comprehensive correction coefficient. And further judging a touch state and positioning the elevation of a touch point. The method can effectively identify and position the condition that the normal vertical line is touched by the foreign matter in the vertical line hole, remarkably improves the fault identification and diagnosis capability of a vertical line monitoring system, eliminates the hidden danger of monitoring data distortion caused by the foreign matter in the hole of the vertical line monitoring system, and improves the accuracy and reliability of concrete dam vertical line monitoring data.

The invention relates to the technical field of bridge cables, and provides a bridge cable steel wire tension estimation method which comprises the steps of analyzing design frequency, measuring the actual length of a cable, collecting vibration intensity data, screening effective data segments and performing low-pass filtering, converting data, extracting first-order and second-order frequency, fitting a modal curve to verify validity and correcting the design frequency. Calculating frequency relative deviation, average frequency change rate and mass loss rate, analyzing equivalent linear density, fitting a modal curve, determining effective length, analyzing equivalent effective length, analyzing equivalent frequency, and finally estimating tension by combining the equivalent linear density, the equivalent effective length and the equivalent frequency. According to the method, the influence of corrosion on the linear density is corrected, and the first-order and second-order modal parameters are combined to cooperatively offset the deviation, so that the accuracy of bridge cable tension measurement is effectively guaranteed.

The invention relates to the technical field of tunnel and underground engineering construction, and discloses a weak disturbance accurate excavation control method and construction device for broken surrounding rock.A parameterized model is established based on a long and short hole different-plane conjugate strategy, arc drilling is implemented by utilizing controlled bending of a flexible drill rod, and the construction efficiency is improved. The end hole track is tangentially parallel to the design axis to eliminate the external insertion angle; during drilling, monitoring lateral force for maintaining bending in real time to feed back the mechanical property of the surrounding rock, and dynamically correcting the explosive charging linear density of the blast hole according to the mechanical property; the density of centralizing fins outside the cartridge is adjusted according to the curvature distribution of the axis of the hole, and a self-adaptive centering charging structure matched with the arc-shaped hole is constructed; during blasting, the short hole is controlled to be detonated in advance, and a micro-fissure zone is prefabricated between the long hole and the contour line to serve as a stress wave cut-off interface. The device comprises an electric automatic paint spraying rod integrating laser ranging, dip angle monitoring and automatic marking functions. The method solves the problem of back break of broken surrounding rocks, and realizes precise contour forming and low damage control of the surrounding rocks.

The invention relates to the technical field of rolling in the ferrous metallurgy industry, and discloses a control method for reducing the non-scale rate in structural round steel production, which comprises the following steps of: acquiring acoustic signals of a high-temperature moving casting blank on line in real time by using a non-contact electromagnetic acoustic sensor (EMATT); the acoustic signals are analyzed in parallel, the real-time linear density of the casting blank is calculated through a calibration model, and an abnormal state code is recognized through mode matching; dynamically adjusting the throwing speed in the continuous casting process according to the real-time linear density and the abnormal state code; generating a complete digital resume for each casting blank; and in the rolling stage, dynamic adjustment and prospective optimization are conducted on rolling parameters in the length direction by means of full-length linear density distribution and abnormal event logs. According to the method, digital tracing of the whole-process quality information of the casting blank and deep cooperation of the continuous casting and rolling procedures are achieved, the quality uniformity of the casting blank is remarkably improved, rolling accidents and defects are reduced, and the product quality and the production efficiency are improved.

A filter plate sub-frame (1) for a filter plate frame assembly having a filter plate frame and a filter plate sub-frame receivable therein. The filter plate sub-frame comprises separate peripheral segments (2a, 3a, 4a, 5a, 6a) attached to each other so as to form a continuous, substantially rectangular shaped peripheral area (1a) having side sides and end sides. The linear density of the side sides (2, 3) is lower than the linear density of the end sides (4, 5), the bending stiffness of the end sides (4, 5) is higher than the bending stiffness of the side sides (2, 3), either or both of the first end side (4) and the second end side (5) are provided with a stiffening strip (4b, 5b) for increasing the bending stiffness of the end side (4, 5). A support surface is provided on a first planar side (1c) of the peripheral segments forming the side sides (2, 3), the support surface being configured to support the filter plate sub-frame on a corresponding receiving surface of the associated filter plate frame.

The application discloses a kind of automobile finite element sealing strip analysis method, by establishing the stiffness coefficient minimum 1D-discrete unit of negligible output as the probe of sealing strip ballast, only need to extract the component of 1Dforce of this unit in X, Y, Z three directions and carry out vector addition in post-processing process, then according to its set stiffness coefficient, the ballast of the sealing strip corresponding to this 1D unit can be obtained, the ballast force thereof can be obtained by bringing in the sealing strip ballast-ballast force curve measured by experiment, according to the need of simulation, the linear density of 1D-discrete unit probe sampling point is adjusted, so that the sealing strip ballast force of different accuracy degrees can be obtained, to achieve the purpose of carefully and accurately extracting the sealing strip ballast force of three-dimensional grid drawing in LS-Dyna.

This utility model relates to the field of tilt measurement technology, specifically to a vibrating wire tiltmeter, comprising a housing, inside which are two symmetrically arranged steel wires, each with a support at both ends. The support is divided into an upper support and a lower support, with the ends of the steel wires fixed to the upper and lower support via wire clamps. The lower support is connected to the upper support via an elastic hinge. Support seats are fixed on both sides of the lower support for fixing the coil. A counterweight is fixed at the lower end of the lower support. Utilizing the characteristics of the vibrating wire sensor, namely that its output signal natural frequency is determined only by its physical parameters such as tension, length, and linear density and does not require power supply, this sensor exhibits strong long-term stability, strong anti-interference ability, low temperature drift and zero drift, and minimal influence from electrical parameters, enabling it to adapt to long-term observation and long-distance testing under harsh conditions.

The invention relates to a tyre (10) comprising a tread (14) comprising a total number of transverse cuts (48, 50) arranged in axial side portions (P1, P2). At least one and at most 30% of the total number of transverse cuts (48, 50) is referred to as indicative transverse cuts (482, 502) having a minimum width strictly greater than 1.5 mm in the portion referred to as the indicative portion (4821, 5021), and the remaining transverse cuts of the total number of transverse cuts (48, 50) are referred to as common transverse cuts (481, 501) having a maximum width of 1.5 mm or less. The linear density DI1 of the one or more indicative lateral cuts (482, 502) satisfies DI1 < = 0.15 cm <-1 >.

This disclosure describes a composition that includes a bulk diffuser that includes a film having a major surface; the film includes a polymer, and a scattering element. The scattering element includes a silicone bead having a mean particle diameter in a range of 2 micrometers (μm) to 9 μm. The linear density of the film is at least 5.1 Wi*μm, wherein the linear density equals the product of the mass fraction of the silicone bead (Wi) and film thickness in micrometers (μm). This disclosure further describes methods of making the film and the bulk diffuser and methods of using the film including, for example, as a bulk diffuser in a sign box.

The invention relates to the technical field of proportion optimization, in particular to a sports composite material multi-target proportion optimization method and system.The sports composite material multi-target proportion optimization method comprises the following steps that a causal path network is constructed by collecting the graphene sheet interlayer spacing, the superposition angle and the nylon fiber surface roughness and combining the graphene volume and the nylon linear density; extracting various performance dominant structures and mapping paths; judging path intersection and analyzing parameter conflicts; executing parameter adjustment to generate a new path; rearranging a map node sequence; the method comprises the following steps: acquiring the graphene lamellar spacing, lamellar angle and nylon surface roughness, combining graphene volume, monofilament density and performance data, constructing a causal network, performing structure and performance mapping, performing correlation analysis to screen dominant features, reconstructing a path sequence, resolving parameter conflicts, performing path rearrangement to fit a target, and performing frequency monitoring stability evaluation. And optimization response and consistency are improved.

The invention discloses an analysis model and a diagnosis method for detecting influence of in-hole foreign matters on a concrete dam inverted vertical line. In order to solve the problems that an existing method highly depends on artificial experience, foreign matter touch judgment is inaccurate, foreign matter touch positioning is difficult to achieve and the like, the efficient inverted plumb line state non-contact diagnosis method is constructed on the basis of a correction model of a string vibration theory in combination with inverted plumb line system natural vibration frequency detection. According to the method, the length of a free swing section of a vertical line is calculated through known inverted line tension, linear density and actually measured natural vibration frequency in combination with information such as in-hole water depth and floater parameters, and the actual length of the vertical line is compared, so that whether the inverted line is in abnormal touch or not is judged. The method has the advantages of non-invasiveness, high sensitivity, high positioning precision and the like, the distortion risk of monitoring data can be effectively reduced, and reliable technical support is provided for stable operation and precise maintenance of a concrete dam safety monitoring system.

The invention relates to the technical field of linear density detection, in particular to a laboratory textile fabric linear density detection system which comprises a six-face column, square grooves communicated with corresponding grooves are formed in the outer side face of the six-face column, a through groove is vertically formed in a moving plate, and a supporting rod which is driven by rotation of the six-face column to vertically slide upwards along the through groove is arranged in the through groove. The top surface of the supporting rod is vertically connected with a square plate which is located under the direction groove and is smaller than the width of the square groove, the knitted fabric is pushed into the square groove through the square plate and is flush with the top surface of the hexahedral column, a high-definition camera which is opposite to the top surface of the hexahedral column up and down is fixedly arranged above the hexahedral column, and the high-definition camera is in signal connection with a data processing unit. According to the textile fabric detection device, firstly, six different textile fabrics can be assembled at a time and detected in sequence, the time consumed for mounting and dismounting each textile fabric is saved, and the accuracy of the textile fabric is guaranteed.