8 results about "Linear density" patented technology

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 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 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 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.

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.

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 >.