64results about How to "Easy to use in engineering" patented technology

The present invention discloses a method for conducting the dry-wet cycle and the direct shear test on the simulated load-bearing soil. A device composed of a dry-wet cycle device and a shear box is arranged. The dry-wet cycle device comprises a nut, a fixed ring, upright rods, a lower bottom plate, a lower bottom plate drain hole, a cutting ring, a cutting ring buckle, a cross rib, an upper cover plate, an upper cover plate drain hole, an upper shear box, a lower shear box and a shear box base. The upright rods are provided with threads along the whole length thereof and are fixedly connected with the lower bottom plate. The upper end of the cross rib on the upper cover plate is larger than the outer diameter of the fixed ring by 1 cm. The diameter of the upper cover plate is slightly smaller than the inner diameter of the cutting ring. The straight-line distance between diagonally arranged upright rods is slightly greater than the diameter of the experiment cutting ring. The shear box is composed of the base, the lower shear box and the upper shear box. The cycle device can be installed directly into the shear box. Through adjusting a direct shear apparatus and a dial indicator, the direct shear test can be conducted. Based on the method, the unloading condition is avoided during the entire process, from the sample preparation, the dry-wet cycle to the shear failure. Meanwhile, the water content change of the test can be accurately controlled.

A method and system for vector control field orientation correction of asynchronous motor. The method comprises the following steps: obtaining three-phase stator currents ia, ib and ic of an asynchronous motor and an angular velocity omega r of the motor; D-axis current isd and q-axis current isq are obtained by 3s / 2r transformation of current ia, ib and ic, and output voltage amplitude Us is calculated by voltage equation of asynchronous motor; Calculate slip angular velocity increment coefficient Kslip and slip angular velocity omega slip of asynchronous motor; Calculate d-axis control voltage of asynchronous motor shown in the description q-axis control voltage shown in the description and dq axis combined voltage shown in the descrition and according to shown in the description and shown in the description. The SVPWM space vector pulse width modulation (SVPWM-SVPWM) is processed to control the operation of the motor. The invention relates to vector control magnetic field orientation correction of asynchronous motor based on voltage observation, By calculating d, q-axis control voltage shown in the description, Thus, the operation of the motor is controlled, the problem of inaccurate orientation of the magnetic field caused by the difficulty of real-time and accurate acquisition of the rotor parameters of the motor is solved, and at the same time, the d-axis and q-axis voltage observation is taken into account, so that the accurate magnetic field positioning can be realized in the full speed range.

The invention provides a waterproof LED flexible optical strip, including an LED flexible optical strip which is coated with a colloid layer which is spliced with a tegmen; meanwhile, the invention also provides a preparation method of the waterproof LED flexible optical strip. The invention has the advantages that the products of the waterproof LED flexible optical strip have high quality reliability and good application safety, the method has low manufacturing cost, and mass yield can be realized; furthermore, the invention can produce arbitrary length according to requirement, which has extremely high product yield and superiority which is incomparable with other waterproof LED flexible optical strips.

The invention discloses a Hartley output method of rigid body space motion states, which enables three velocity components and a ternary figure of a body axis to form linear simultaneous differential equations by defining the ternary figure, and adopts a Hartley function to conduct approximate approaching description of roll rate P, pitching rate Q and yaw rate R. Users can solve a state-transition matrix of a system in accordance with arbitrary order keeper modes, and then obtain expression of rigid motion discrete state equations, thereby avoiding gesture equation strange problems and obtaining main motion states of a rigid body. The Hartley output method enables the state-transition matrix to be a blocking upper triangular form by introducing the ternary figure, can reduce order to solve the state-transition matrix, greatly simplifies computational complexity and is convenient to use in construction.

The invention discloses a method for quantifying solute transport multi-scale characteristics in a complex medium. The method comprises the steps of selecting a solute transport process in a concretecomplex medium as a research object, determining a test condition, observing a movement trajectory of a solute particle to obtain test data R of a mean square displacement of the solute particle, wherein R is a set of average values of distances between positions x of all particle at the t moment and respective initial point when the movement time is t; deducing a multi-scale transport rate of thesolute transport according to a distributed step fractal derivation model or an equivalent form thereof; calculating a value of a parameter c in the multi-scale transport rate in combination with thetest data R of the mean square displacement of the solute particle; and obtaining multi-scale characteristics of the solute transport in the complex medium according to the value of the parameter c,and classifying the solute transport process. The method for quantifying the solute transport multi-scale characteristics in the complex medium has broad engineering application prospects, can be usedfor prediction, assessment and management of pollutant transport. Compared with an existing model or technology, the method is more convenient for engineering use.

The invention discloses a polynomial type output method for a spatial motion state of a rigid body. In the method, by defining a ternary number, three speed components of a machine body axis system and the ternary number constitute a linear simultaneous differential equation, polynomials are used for performing approximate description on roll rate p, pitch rate q and yaw rate r, a state-transition matrix of a system can be solved according to a random-order keeper manner so as to further obtain an expression of a motion discrete state equation of the rigid body, and thus, the problem of a singular gesture equation is avoided and the main motion state of the rigid body is obtained. In the invention, by introducing the ternary number to make the state-transition matrix be of a blocked upper triangular form, the state-transition matrix can be solved in a reduced order manner, the computation complexity is greatly simplified, and engineering purposes are facilitated.

The invention discloses a red mud curing agent and a use thereof and belongs to the technical field of red mud comprehensive utilization. The red mud curing agent comprises 20-90 parts of slag powder, 1-50 parts of fly ash, 1-30 parts of silt, 5-15 parts of a catalysis exciting agent containing sodium, potassium, calcium and magnesium and 0.1-10 parts of whisker fibers. Fly ash and silt can well adjust a silicon-aluminum ratio of red mud and liquid-plastic limit index and improve engineering body strength performance indexes and engineering usability. Whisker fibers improve a flexural capability and crack resistance of the finished product. The red mud curing agent is powdery solid, is convenient for engineering use, and can be used by addition and stirring based on a ratio according to different engineering performance requirements. Through reasonable blending, the red mud curing agent can improve strength of a cured body containing red mud as a main component, completely satisfy building non-burnt brick, road base and surface layer engineering index requirements and realize large consumption of red mud.

The invention discloses a calibrating ball based wave-absorbing material reflectivity testing method. According to the method, a main control computer, a transmitter, a receiver, a transmitting antenna and a receiving antenna are taken as a testing system, and the testing accuracy of the reflectivity of a wave-absorbing material is increased through the calibrating ball based reflectivity testing method. The calibrating ball based wave-absorbing material reflectivity testing method not only solves the problem of testing error caused by alignment errors, transceiving coupling and the like between a tested target and the transmitting and receiving antennas in the process of testing the reflectivity of the wave-absorbing material, but also increases the testing accuracy; moreover, the method provided by the invention is simple in implementation mode and flexible in installation.