32 results about "Gravity coefficient" patented technology

According to a torque detecting method, gravitational torque applied to a rotary shaft of an arm is detected in a condition where position control of the arm is stopped, when the arm is located at a first position at which the arm is oriented in a direction different from a direction of gravitational force. Then, a gravity coefficient used for calculating gravitational torque corresponding to a position of the arm is calculated, based on the gravitational torque and the first position. Then, gravitational torque during position control is calculated, based on the position of the arm detected during the position control, and the gravity coefficient. Further, an actual output torque during the position control is calculated, based on operating torque applied to the rotary shaft and detected during the position control, and the gravitational torque calculated during the position control.

The invention discloses a super-gravity device used for electrochemical deposition in ironic liquid, and belongs to the field of the electrochemical deposition under a special condition. The super-gravity device comprises an electrolytic tank, a balance weight system, a shaft cooling system, a shielding gas transmission system, a speed measurement system, a rotating speed and temperature control display system and a conducting slip ring system. In the reaction process, a motor drives a shaft to rotate to supply required centrifugal force; the centrifugal force is measured by a super-gravity coefficient; the super-gravity coefficient is calculated by the speed measurement system; the temperature in the electrolytic tank is controlled by the temperature control system; the dynamic balance of the electrolytic tank in a centrifugal field is realized through the balance weight system; an inert gas atmosphere required by the reaction is realized through the shielding gas transmission system; the shaft cooling of the super-gravity device is realized through the shaft cooling system; and the current required in the electro-deposition process is supplied by the conducting slip ring system.

The invention discloses a preparation method and preparation device of a titanium-aluminum alloy, and belongs to the field of preparation of the titanium-aluminum alloy by an aluminothermic reduction method. The invention provides a preparation method and a corresponding preparation device of the titanium-aluminum alloy, which can improve the residue-metal separation effect and the quality of the titanium-aluminum alloy; the titanium-aluminum alloy is prepared through an aluminothermic reduction reaction under a super-gravity system environment, so that the residue-metal separation effect can be improved. The preparation device comprises a reaction tank and a super-gravity generating system, wherein the super-gravity generating system comprises a support frame, a central rotating shaft, a rotating cross arm and a driving mechanism, the reaction tank is in hanging connection to the free end part, which is away from the central rotating shaft, of the rotating cross arm, through a steel rope. The reaction tank is driven by the driving mechanism to rotate around the axis of the central rotating shaft, so that performing an aluminothermic reaction in the reaction tank under the super-gravity field environment is realized. The preparation device disclosed by the invention is simple in structure, and super-gravity coefficients can convenient to regulate as needed.

The invention discloses a mine microseismic signal identification method based on energy distribution characteristics, belonging to the field of signal analysis and identification, comprising the following steps: reading the microseismic signal x(t) to be identified; performing VMD decomposition on x(t) to obtain K Variational modal components arranged in order of frequency from high to low; calculate the frequency band energy of each modal component, and extract the energy percentage value of each modal component in the original signal to form an energy distribution vector P; take the energy distribution vector P as Calculate the center of gravity coefficient cx of the X-axis of the energy distribution based on the basis; identify the microseismic signal of the mine according to the identification threshold T, if cx>T is the microseismic signal of the coal rock mass rupture in the mine, and if cx≤T is the blasting vibration signal; finally the value of the identification threshold T Adaptive update. The invention can effectively distinguish the microseismic signal of coal rock mass rupture and the blasting vibration signal, and has the characteristics of strong adaptability, high accuracy and the like.

The application discloses a method and related equipment for analyzing the stress data of the surrounding rock in full-section excavation of a tunnel. The vertical distance of the tunnel bottom plane; normalize the vertical distance between all thickness centers and the tunnel bottom plane to be excavated to obtain the gravity coefficient; multiply the gravity value by the corresponding gravity coefficient to obtain the bulk density; according to the bulk density, cohesion and content Friction angle, establish the initial stress 3D grid model of the rock mass within the set range around the tunnel to be excavated; in the initial stress 3D grid model, remove the initial stress 3D grid data of the tunnel to be excavated, and obtain the retained stress 3D grid model; formulate the construction plan for excavation; measure the excavation stress data of the surrounding rock of the tunnel after actual excavation; and correct the three-dimensional mesh model of the retained stress according to the excavation stress data. It can analyze the surrounding rock stress data of complex geological types and structures.

The invention relates to a method for manufacturing a bearing ring by adopting a centrifugal casting technique, wherein the preheating temperature of charging materials is between 150 and 300 DEG C; the gravity coefficient for the start-up of a centrifugal machine is controlled to be between 50 and 60; and the centrifugal pouring adopts a bottom pouring type and a movable type, the pouring temperature is controlled to be between 1,640 and 1,680 DEG C, and the pouring time is between 5 and 10 minutes. Compared with the prior art, the method has the advantages of reducing the admittance, savingraw materials, reducing the cost effectively, and improving the benefits of enterprises.

The invention provides a method and a device for preparing porous foam metal through super-gravity seepage and belongs to the field of foam metal material preparation. In the invention, soluble salt particles of which the average particle size is 0.1-5mm are used as a precursor, and metal is used as a seepage body. A centrifugal casting mold is filled with the soluble salt particles which are dried and sieved, and a porous plate is fixed at the top of the precursor. The centrifugal casting mold which is preheated is assembled on a centrifugal platform, centrifugal equipment is started, and molten metal which is pre-molten is poured into a feeding hopper of the centrifugal equipment. The molten metal being driven by super-gravity seeps into gaps of the precursor via the porous plate, and the super-gravity coefficient of the process is controlled above 20-180 from the big to the small according to the average particle size of the soluble salt particles, namely the precursor. After the metal is solidified, the centrifugal casting mold is disassembled, a compound body is taken out, and cutting processing is carried out. The soluble salt particles are dissolved by using water and removed from the compound body, and the porous foam metal is obtained. The method is simple in technology and low in cost, and the prepared foam aluminum alloy is even in structure, proper in size and excellent in mechanical properties.

A method for producing a large magnesium alloy ring by means of centrifugal casting includes: preheating a mould; hanging thermal insulation coatings and determining centrifugal casting parameters; performing centrifugal casting and the like. The method is technically characterized by determination of rotation speed and casting speed. A centrifugal power device is started for centrifugal casting, the centrifugal rotation speed n is calculated according to the gravity coefficient formula as shown in the original text, n=29.9, wherein n refers to the centrifugal rotation speed, R refers to the radius (m) of the inner surface of a casting, and G refers to gravity coefficient. The method overcomes the shortcomings of an existing large magnesium alloy ring production process, is used for producing the large magnesium alloy ring with compact texture and high tensile strength, and has an important significance for magnesium alloy application and development of magnesium alloy centrifugal casting technology.