23 results about "Inertial moment" patented technology

This invention discloses a method for strength calculation of a detachable support device. The method includes: obtaining the supporting force and radial force per unit length of the detachable support device; calculating the bending moment and horizontal tensile force at the connecting section based on the supporting force and the radial force per unit length; establishing the static moment equilibrium equation of the connecting section and determining the neutral axis position of the connecting section through iterative calculation; calculating the moment of inertia of the connecting section based on the neutral axis position; and calculating the maximum tensile stress borne by the fastener based on the moment of inertia, the bending moment, and the horizontal tensile force, so as to perform strength verification of the connecting section. This invention derives the strength verification formula and judgment criteria for key stress sections in detachable support structures, which is convenient for engineering technicians and ensures operational safety.

This invention relates to the technical field of lifting operations, and more particularly to a lifting arm mechanism, comprising a main frame formed by splicing two boom side plates. The two boom side plates are bent and symmetrically distributed along the splicing area, and are arranged opposite each other inside to form an accommodating cavity; a reinforcing support assembly is located in the accommodating cavity and distributed along the length direction of the boom side plates, with at least one assembly provided; and a connecting bushing assembly. This lifting arm mechanism, through the symmetrical fabrication of the two boom side plates, maintains balance on both sides, better realizes the function of the mechanical system, ensures the precision and quality of the structure, and provides greater stability during lifting. Simultaneously, the integral bending avoids the multiple welds of traditional splicing, eliminates stress concentration points at the welds, and forms a "groove-shaped" cross-section with a larger moment of inertia, significantly improving bending stiffness.

This invention provides a design method for optimizing the sill section based on the product moment of inertia. The method decomposes the body-in-white performance target of a reference vehicle into the product moment of inertia of each section, thereby obtaining the product moment of inertia of the section at the sill beam. Then, considering boundary conditions such as layout space, exterior assembly parts, and process constraints, a preliminary sill section is fabricated. Finally, using the Design of Elements (DOE) tool, parameters are optimized based on the sill product moment of inertia target to achieve weight reduction. This allows the vehicle to achieve the performance target set by the project while also optimizing for weight reduction, thereby achieving the goal of overall vehicle lightweighting and cost savings.

A model processing method for two-dimensional finite element analysis of a cylindrical member and a storage medium, which contribute to improvement of the accuracy of two-dimensional finite element analysis of a cylindrical member. In the model processing method for two-dimensional finite element analysis of a cylindrical member of the present invention, a plurality of pairs of polygons located in a plane of a cross section of a cylinder are used as equivalent cross sections of a circular cross section of the cylindrical member, the pairs of polygons are respectively axially symmetrical about a first axis passing through a center of the circular cross section, and each polygon is axially symmetrical about a second axis passing through the center and perpendicular to the first axis, on each side of the first axis, a plurality of polygons are adjacently arranged from the first axis in a direction away from the first axis, the more away from the first axis, the shorter the intersection line between the adjacent polygons, and the size of each polygon is determined in a manner satisfying a condition that the total area of the plurality of pairs of polygons is equal to the total area of the circular cross section and a condition that the total moment of inertia of the plurality of pairs of polygons is equal to the moment of inertia of the circular cross section.

This invention relates to the field of aero-engine technology and discloses a design method and system for the torsional vibration of a low-pressure turbine shaft of an aero-engine. It performs segmented torsional stiffness calculations on the low-pressure turbine shaft based on its actual structure. The torsional frequency analysis of the low-pressure turbine shaft is performed after fully considering the torsional stiffness, polar moment of inertia of the fan rotor, and polar moment of inertia of the low-pressure turbine rotor. This method eliminates the need to rebuild a simulation model to complete the margin analysis between the torsional frequency of the low-pressure turbine shaft and the vibration frequencies generated by all engine components. It is more suitable for the needs of rapid iteration in multiple rounds of design, enabling rapid evaluation and optimization of the torsional vibration frequency of the low-pressure turbine shaft in the early stages of engine design. This guides the structural design of the low-pressure turbine shaft, ensuring that the torsional vibration frequency of the turbofan engine's low-pressure turbine shaft meets design requirements and that torsional resonance does not occur within the operating speed range, thus shortening the overall design cycle.

An inverted pendulum wave energy converter for floating structures, boats, and ships is disclosed. The device comprises an inverted pendulum structure having an inertia moment changing system and an energy conversion connection system connecting the inverted pendulum structure to a host vessel. The ability to control the inertia moment of the inverted pendulum structure with respect to the oscillation axis of the host vessel sufficiently minimizes the risk of capsizing in survival mode, maximizes the conversion of wave energy to electricity, and minimizes the oscillation amplitude of the host vessel. In boats and ships, the inverted pendulum structure is equipped with a wind-assisted propulsion system that maximizes the efficiency of clean energy recovery.

The application discloses a Spar type wind turbine floating platform and a construction method thereof. The Spar type wind turbine floating platform comprises a column structure and a ballast structure. The column structure has a mounting end and a ballast end in an axial direction. The mounting end is used for mounting a wind turbine tower. The ballast structure is arranged at the ballast end and is arranged in an extending mode along a radial direction of the column structure. An inner part of the ballast structure is formed with a plurality of ballast sub-chambers which are distributed along the axial direction and are used for loading external ballast. The ballast structure is arranged in the extending mode along the radial direction, so as to adjust the gravity center and the inertia moment of the structure. Therefore, the required draft of the wind turbine floating platform is greatly reduced on the premise that the gravity center of the structure is lower than the floating center, and the wind turbine floating platform can be adapted to the environment of a coastal area with a shallow water depth.

The invention provides a welding robot tracking method and system with self-adaptive fault-tolerant capability. The method belongs to the field of welding robots and comprises the following steps: establishing a welding robot dynamic model considering actuator faults; deriving a state-space equation according to the welding robot kinetic model, and defining a tracking error between an actual trajectory of the welding robot and a preset expected trajectory based on the state-space equation; designing a preset performance function; constructing a conversion error based on the tracking error and a preset performance function, and designing a preset time terminal sliding mode surface; and according to the preset time terminal sliding mode surface, the known modeling part, the multiplicative factor lower bound, the additive fault upper bound and the inertia matrix upper bound, the Coriolis force matrix upper bound and the gravity matrix upper bound of the unknown modeling part in the welding robot dynamic model, a fault-tolerant controller is constructed. The trajectory tracking precision of the welding robot can be improved.

The application discloses a ROPS framework top cross beam optimization design method and an engineering machinery cab, and the design method comprises the following steps: by analyzing the bending stress value of a portal hyperstatic structure mechanical model, the inertia moment I ratio of the top cross beam and the stand column when the maximum bending stress of the top cross beam and the stand column is equal is obtained, that is, the optimal cross section inertia moment ratio relationship of the top cross beam and the stand column, and the lightweight design of the ROPS framework is realized.

This invention discloses an integrated anti-deformation transformer expander housing and its molding method, relating to the field of transformer expander housings. This integrated anti-deformation transformer expander housing utilizes the corrugated cylindrical shape of the integrally molded outer housing to increase the moment of inertia of the cross-section through the undulating corrugations, thereby improving the axial compressive strength, radial instability resistance, and bending stiffness of the cylinder, offsetting deformation caused by external forces and internal pressure. During axial impact deformation, the sliding between the reinforcing plates in the same group, in conjunction with a guiding mechanism, guides the deformation of the outer housing cylinder. Simultaneously, the plate groove limits the sliding distance between the reinforcing plates in the same group, preventing excessive deformation that could impact the internal expander. Furthermore, the close fit between the reinforcing plates provides support during lateral impacts, improving the outer housing cylinder's resistance to lateral impacts and preventing bending.

This invention relates to the field of data processing, and discloses a model processing method, a robotic arm control method, a device, an equipment, and a storage medium. The model processing method includes: constructing a target dynamic model of the robotic arm and the contacting object in Cartesian space based on the angular displacement, angular velocity, angular acceleration, and driving torque of at least one set of robotic arm joints; obtaining the actual position, actual velocity, actual acceleration, and actual contact force of at least one set of robotic arms; determining the position error between each set of actual positions and desired positions, the velocity error between each set of actual velocities and desired velocities, the acceleration error between each set of actual accelerations and desired accelerations, and the contact force error between each set of actual contact forces and desired contact forces; constructing an impedance model of the robotic arm based on the position error, velocity error, acceleration error, and contact force error; and updating the second inertia matrix of the impedance model to the first inertia matrix to obtain the target impedance model of the robotic arm.

This invention discloses an automated design method for axially compressed circular steel tube sections reinforced with T-shaped steel based on target moment of inertia. Addressing the problem in existing steel reinforcement designs where multiple geometric variables are coupled, leading to inability to directly solve the problem and heavy reliance on trial and error based on manual experience, this method obtains the original tube parameters and reinforcement axial force requirements. It introduces a modified slenderness ratio based on the combined T-shaped steel section, using the standard Class A column curve as a benchmark to inversely deduce the target total moment of inertia required for reinforcement. Based on the principle of stiffness superposition, the independent moment of inertia requirements of the T-shaped steel are separated. Subsequently, a multi-dimensional parameter space including web and flange dimensions is constructed, and local stability width-to-thickness ratio limits and welding construction requirements such as height-to-width ratio and thickness coordination are forcibly coupled as boundary constraints. Finally, a full-parameter space grid search algorithm is used to traverse and optimize the discrete integer domain. This invention achieves a direct mapping from macroscopic bearing capacity requirements to microscopic multivariable section dimensions, automatically outputting a complete set of feasible solutions that meet both mechanical and construction standards, significantly improving the accuracy and economic efficiency of reinforcement design.

This invention relates to the field of automated instrument control technology, and particularly to an intelligent control method and system for a rotary float level transmitter. The method includes the following steps: calculating the deflection compensation factor at each sampling point; the deflection compensation factor is positively correlated with the elastic modulus and moment of inertia of the connecting rod material, and negatively correlated with the equivalent force-bearing mass and effective lever arm length of the float; calculating the variable torque characteristic operator at the sampling point; the variable torque characteristic operator is positively correlated with the instantaneous angular acceleration of the original angle sequence, and negatively correlated with the absolute value of the sine of the original angle; coupling the original angle, the variable torque characteristic operator, and the deflection compensation factor to obtain the reconstructed level value of the sampling point; and driving the actuator to adjust the flow rate in response to the reconstructed level value of the sampling point exceeding a set threshold, which can effectively improve the control accuracy of the rotary float level transmitter.

The application discloses an integrated high-strength steel multi-cavity automobile door sill reinforcing beam and a processing method thereof. The reinforcing beam is integrally formed by roll bending of a high-strength steel plate and has a multi-cavity structure with four closed cavities in a cross section; the reinforcing beam comprises an outer part and an inner part which are stacked one above the other, the outer part is a Chinese character 'Ri' type structure, the inner part is a horizontally arranged Chinese character 'Ri' type structure, and a shared beam wall is arranged between the outer part and the inner part; the reinforcing beam has a variable cross section with a narrow upper part and a wide lower part in the whole cross section, and a connecting portion of the outer part and the inner part is transitioned through a slope. The door sill reinforcing beam has excellent mechanical properties and safety, greatly improves the inertia moment of the cross section to the vertical bending moment, can effectively resist the intrusion of a collision object, can maintain the structural integrity under a severe column impact working condition, simultaneously reduces material cost and processing cost, and realizes efficient production of the door sill reinforcing beam and product light weight.

This invention relates to the field of engine rotor elastic support technology, and discloses a method, device, equipment, and medium for calculating the radial performance of an integrated elastic support. For the special structure of an integrated elastic support with measurable axial force, this invention establishes a three-segment mechanical model including elastic bar one, elastic ring, and elastic bar two. By calculating the moment of inertia of each section about its own centroidal principal axis, the total deflection of the free end under radial load is obtained using the superposition method, and the radial stiffness is then determined. Simultaneously, based on the bending moment distribution, the fatigue stress at each connection end on elastic bar one and elastic bar two is calculated. This provides a dedicated analytical calculation method for radial stiffness and fatigue stress for this novel elastic support structure, filling the gap in existing technology which is only applicable to single-segment elastic bars, enabling designers to quickly and efficiently obtain the radial stiffness and stress level of the elastic support.

This application relates to the field of gate control in water conservancy projects, and discloses an intelligent gate control method and system for water conservancy projects. The method includes: collecting and processing water level difference pressure data on both sides of the gate to obtain a smooth curve and a load deviation detection mechanism; analyzing response delay and torque fluctuation to trigger dynamic damping compensation; analyzing the impact of uneven load on torque efficiency to obtain brake pad wear and oil pressure attenuation parameters; measuring braking response delay and torque distribution deviation to initiate heat accumulation monitoring and compensation; detecting brake clearance and disc surface roughness, and adjusting braking force output based on brake fluid viscosity; controlling the gate using the adjusted parameters, monitoring the impact of moment of inertia on positioning accuracy, and obtaining position deviation and stability results; updating the detection mechanism and damping model when the deviation exceeds a threshold to form a closed-loop system. This application solves the problems of low positioning accuracy and poor stability caused by load fluctuations and brake attenuation in gate control, improving control accuracy and system reliability.

The application belongs to the technical field of robot control, and particularly relates to a flight manipulator coupling system control method based on total Jacobian matrix and refined modeling, which is based on total Jacobian matrix and refined modeling and comprises the following steps: defining a plurality of coordinate systems to describe system motion states; constructing a 6x(6+n) dimensional total Jacobian matrix fusing unmanned aerial vehicle and manipulator motion; establishing an inertia matrix and a Coriolis matrix containing full coupling terms; designing a refined dynamics model containing a transmission ratio matrix and nonlinear friction; constructing a mechanical gripper grabbing dynamics model based on contact stiffness and damping matrix; designing a flight-grabbing integrated control architecture based on impedance control, and unifying position, attitude and impedance control in a Lyapunov framework; and proposing a stability analysis method based on Lyapunov theory. The application realizes close coupling and efficient cooperation of the unmanned aerial vehicle and the manipulator, and improves system modeling accuracy, grabbing stability and control performance.

The application discloses a mechanical arm system fault-tolerant distributed learning control method based on a loose alignment condition. The method designs an auxiliary system of loose alignment condition and compensation input saturation, constructs inverse step error, a virtual controller and compensation error. An iterative learning controller is designed to control the mechanical arm system and compensate for unknown inertia matrix, parameter uncertainty and disturbance, and convergence of the error system is analyzed by constructing a composite energy function. Compared with traditional control methods requiring accurate mathematical models, the control algorithm is more novel and the application condition is simple. When the method is used for repetitive task operation, the control precision is effectively improved, and the method has good engineering application value.

A control device (10) of a vehicle (1) provided with two electric motors (2) that drive left and right wheels (5) of the vehicle (1) is provided with: a first calculation section (11) that calculates a required torque of a left axle (4L) and a required torque of a right axle (4R) of the vehicle (1) respectively; a second calculation section (12) that calculates an equivalent inertia moment of the left axle (4L) and an equivalent inertia moment of the right axle (4R) respectively; a third calculation section (13) that calculates a presumed angular acceleration of the left and right wheels (5) respectively based on the two required torques calculated by the first calculation section (11) and the two equivalent inertia moments calculated by the second calculation section (12); and a determination section (14) that compares an actual angular acceleration of the left and right wheels (5) and the presumed angular acceleration calculated by the third calculation section (13) and determines whether the left and right wheels (5) are off the ground respectively.

This application proposes a welding robot tracking method and system with adaptive fault tolerance. Belonging to the field of welding robots, the method includes: establishing a welding robot dynamic model considering actuator failures; deriving the state-space equations based on the welding robot dynamic model, and defining the tracking error between the actual trajectory of the welding robot and the preset desired trajectory based on the state-space equations; designing a preset performance function; constructing a conversion error based on the tracking error and the preset performance function, and designing a predetermined time-end sliding surface; and constructing a fault-tolerant controller based on the predetermined time-end sliding surface, the known modeling parts in the welding robot dynamic model, the lower bound of the multiplicative factor, the upper bound of the additive fault, and the upper bounds of the inertia matrix, Coriolis force matrix, and gravity matrix of the unknown modeling parts. This invention can improve the trajectory tracking accuracy of welding robots.

The present application relates to a kind of cantilever end torsion angle prediction method, control method, system and medium, it is related to end torsion angle prediction and control technical field.Prediction method, based on the stiffness of the obtained bridge, section inertia moment, section shear modulus, section torsion constant and cantilever curved bridge structure dead weight, the undetermined coefficient of the trigonometric series of cantilever end deflection and torsion angle is calculated, and further the cantilever end torsion angle and deflection are calculated.Compared with prior art, the relationship between structure parameters and cantilever end rotation angle can be directly reflected, so that parameter sensitivity analysis and engineering optimization design can be facilitated, and the applicability of the project is improved.

One aspect of the present disclosure is a real-time weight compensation method for automatic swing control of a construction machine, wherein the construction machine comprises a lower body and an upper structure swingably supported on the lower body, and the upper structure comprises an upper slewing body, a boom connected to the upper slewing body, an arm connected to the boom, and an attachment connected to the arm; the method comprises the steps of: measuring a current arm joint angle (θc) using one or more detection means and measuring a current boom cylinder pressure (Pc) at the current arm joint angle (θc) using pressure measuring means; calculating a pressure difference (P) between the measured current boom cylinder pressure (Pc) at the current arm joint angle (θc) and a preset reference boom cylinder pressure (Pr) at the corresponding arm joint angle (θc); converting the calculated pressure difference (P) into a preset reference additional weight (Wr) at the corresponding pressure difference (P); and updating the swing moment of inertia of the upper structure in real time by reflecting the reference additional weight (Wr). Provides a method that includes steps.

This invention discloses a real-time dynamic trajectory correction system for the jacking process of a steel main beam based on three-dimensional positioning, specifically relating to the field of intelligent manufacturing technology. It includes the following modules: a multi-source sensor data acquisition module, a guide beam spatial pose calculation module, a three-dimensional trajectory deviation vector module, a jacking cylinder correction calculation module, and a dynamic correction trajectory planning module. This invention obtains the strain distribution of the guide beam by acquiring the center wavelength drift of the fiber optic grating, calculates the strain tensor by combining it with the preset cross-sectional moment of inertia, and reconstructs the instantaneous spatial shape of the guide beam caused by stress and temperature changes by integrating along the axis. By calculating the spatial deviation vector between the measured coordinates and the trajectory points in the steel main beam design blueprint, and projecting and decomposing this vector onto the action axis of each jack, and weighting it according to the resistance coefficient of the jacking bracket, the system directly generates multi-channel cylinder stroke correction amounts, realizing dynamic trajectory tracking and real-time correction based on the actual stress state of the guide beam.