13 results about "Spring system" patented technology

The application discloses a kind of electromagnetic transducer modeling and dynamic distributed parameter confirmation method considering electro-magnetic-mechanical-acoustic coupling, comprising: constructing electromagnetic transducer system dynamic multi-physical field distributed parameter model DPM;Based on parallel genetic algorithm PGA model optimization method;The dynamic multi-physical field distributed parameter model DPM includes: constructing excitation circuit equivalent model, the excitation circuit equivalent model includes several excitation main loop units, several air gap leakage magnetic loop units and several permanent magnet loop units;Construct mechanical structure equivalent model, the mechanical structure equivalent model includes system radiation plate face, spring system and rubber plate face and so on physical model.The PGA algorithm is optimized to DPM model parameter in the application, improves the performance efficiency of electromagnetic transducer, and provides a new method for the design of electromagnetic transducer.

The invention discloses a method for evaluating impact damage of a steel reinforced concrete column based on an equivalent single-degree-of-freedom system. The method comprises the following steps: 1, establishing an equivalent system of the steel reinforced concrete column and a basic motion equation of the equivalent system; 2, converting the equivalent system motion equation into a real structure system motion equation; 3, determining a resistance function of each deformation stage of the steel reinforced concrete column according to the relationship between the displacement of the key points on the steel reinforced concrete column and the structural resistance; 4, solving an equivalent load; 5, obtaining the maximum displacement response; and 6, evaluating the damage. By establishing an equivalent relationship with an actual structure, a complex dynamic response problem is simplified into a motion equation of a mass-spring system for solving, so that the midspan maximum displacement response of the steel reinforced concrete column under the impact effect is effectively predicted, and on the basis, the support corner damage criterion is combined, and the maximum displacement response of the steel reinforced concrete column is predicted. The damage grade of the steel reinforced concrete column is systematically divided, and a visual and unified quantitative standard is provided for damage evaluation.

The invention relates to the technical field of bridge engineering testing, in particular to a two-dimensional structure automatic control vibration testing device which comprises a transverse rail, two downwind rails and a model unit, the transverse rail is arranged above the downwind rails, one downwind rail is fixed to the ground, the other downwind rail is fixed to a top external keel, and the model unit is arranged above the transverse rail. The model unit comprises two groups of model systems and two groups of model bodies, each group of model system comprises a displacement rod, a lifting point system, a spring system and a detection unit, and the detection unit is arranged between the lifting rod and the two groups of downwind tracks; the electric vibration exciter instantly starts to drive the model system to drive the model body to vibrate, the detection unit collects vibration data, and a double-model parallel test platform is integrated on one set of device, so that rapid switching and synchronous comparison test of various sliding and fixed boundary conditions are realized. The limitation that a traditional device is single in function and inflexible in boundary simulation is overcome.

The invention relates to the field of structural mechanics, in particular to a substance point-discrete element coupling method for simulating interaction of a continuum and a slender structure. The method comprises the following steps: acquiring mass and momentum in a substance point of a continuum, and analyzing the substance point of the continuum to obtain continuum data; obtaining a slender structure, and discretizing and modeling the slender structure to obtain slender structure data; the continuum data and the slender structure data are analyzed, and the contact force between the substance points and the discrete element particles is obtained; analyzing the mass-spring system to obtain a reference time step length, and updating the speeds, positions and stresses of the substance points and the DEM particles to obtain a corresponding motion simulation model; setting a verification example I, a verification example II and a mechanical simulation experiment, and performing experimental verification evaluation on the motion simulation model to obtain a verification evaluation result I, a verification evaluation result II and a verification evaluation result III; according to the invention, the simulation speed and precision can be improved.

The invention belongs to the technical field of non-linear dynamics, and particularly relates to a V-shaped spring system, a lagging and bifurcation experiment device and an experiment method.The V-shaped spring system comprises a base, two telescopic arms and a spring, the two telescopic arms are the same in length, the first ends of the two telescopic arms are connected to a first connecting piece, and the second ends of the two telescopic arms are connected to a second connecting piece; at least one of the two telescopic arms is rotationally connected with the first connecting piece, the second ends of the two telescopic arms are respectively connected with a second connecting piece, the telescopic arms are rotationally connected to the base through the second connecting pieces, and the first connecting piece is movably arranged on the base along the perpendicular center line of the connecting line of the second ends of the two telescopic arms; the two telescopic arms are sleeved with springs, and the springs can stretch out and draw back along with the telescopic arms. According to the V-shaped spring system and the lagging and bifurcation experiment device applying the V-shaped spring system, the situation that the spring deviates from the axis of the spring during deformation can be reduced, and the result accuracy during theoretical verification is improved.

The invention belongs to the related technical field of suspension bridge sling force recognition, and discloses a suspension bridge sling force recognition method and device considering the multi-stiffness characteristic of a main cable, and the method comprises the steps: S1, building a string spring system analysis model of the main cable of a suspension bridge, the chord spring system analytical model adopts a combined chord spring unit to simulate geometric flexibility, material elasticity and tension-related secondary bending stiffness characteristics of a main cable, and equivalent node correction force is utilized to simulate a local bending effect of a cable clamp area; and S2, based on the chord spring system analytical model, establishing an increment balance equation considering construction historical information, based on the increment balance equation, establishing an inverse problem optimization model for solving the sling force under geometric observation of the main cable, and solving the inverse problem optimization model by adopting a variable step iterative algorithm to obtain the sling force. According to the invention, the recognition accuracy of the sling force is improved.

Plicator systems may have two telescoping components that when arranged in an open configuration have one or more windows into which tissue of, for example, a tubular organ may be invaginated. The invaginated tissue may be secured in the window when the plicator system transitions to a closed configuration. Closing the window may act to, for example, clamp, pierce of the tubular organ tissue invaginated into the window, thereby securing the invaginated tubular organ tissue into the window. In some instances, an axially- expanding spring may be disposed between two plicator systems and when this assembly is implanted in a tubular organ, axial expansion of the spring may exert a distending force on the tubular organ, which may stimulate growth of the tubular organ.

The invention discloses a method for improving impedance stability of a power spring system based on generalized closed-loop control, and belongs to the technical field of power electronics and intelligent power grids. The invention innovatively provides a generalized closed-loop control method for improving the impedance stability of the power spring system. The method comprises the following steps: establishing a mathematical model of the power spring system; according to the generalized closed-loop control method, an internal virtual impedance control item Hinter, a closed-loop control item HG and an external virtual impedance control item Hexternal are designed step by step. Simulation shows that the adaptive capacity of the power spring system to the wide-range power grid impedance is remarkably improved through the control method, and the control method is superior to a traditional double-closed-loop method in the aspects of the dynamic response speed, the harmonic suppression capacity and the stability robustness. According to the method, the stable operation boundary of the power spring is widened, so that the power spring can better adapt to complex and changeable operation conditions of a high-proportion new energy power grid in the future.

The present application relates to the technical field of bridge engineering test, and specifically relates to a two-dimensional structure automatic control vibration test device, which comprises a transverse track, two groups of along-wind tracks and model units, the transverse track is arranged above the along-wind tracks, one group of the along-wind tracks is fixed to the ground, and the other group is fixed to the top outer keel, the model unit comprises two groups of model systems and two groups of model bodies, each group of the model system comprises a displacement rod, a hanging point system, a spring system and a detection unit, the detection unit is arranged between the hanger and the two groups of along-wind tracks; an electric exciter is instantaneously started to drive the model system to drive the model body to vibrate, the detection unit collects vibration data, through integration of a double-model parallel test platform on a set of device, quick switching and synchronous comparison test of various boundary conditions such as sliding and fixing are realized, and the limitations of single function and inflexible boundary simulation of traditional devices are overcome.

The present application belongs to the technical fields of suspension bridge cable force identification, and discloses a suspension bridge cable force identification method and equipment considering the multi-rigidity characteristics of the main cable, which comprises the following steps: S1, a string spring system analytical model of the main cable of the suspension bridge is established, the string spring system analytical model is used to simulate the geometric flexibility, material elasticity and tension-related quadratic bending rigidity characteristics of the main cable by using a combined string spring unit, and an equivalent node correction force is used to simulate the local bending effect of the cable clamp area; S2, an incremental balance equation considering the construction history information is established based on the string spring system analytical model, an inverse problem optimization model for solving the cable force under the geometric observation of the main cable is established based on the incremental balance equation, and a variable step iterative algorithm is used to solve the inverse problem optimization model to obtain the cable force. The present application improves the identification accuracy of the cable force.

The application belongs to the technical field of additive manufacturing, and discloses a simulation method and system for stress deformation of laser powder bed fusion based on a particle-spring model. The method comprises the following steps: S1, dividing a three-dimensional model of a substrate and a to-be-formed part into a plurality of hexahedral grid models, and equivalently coupling each hexahedral grid model into a three-type spring system; S2, under a temperature field at a current time, calculating forces borne by each vertex of the hexahedron and updating coordinates of each vertex; S3, judging whether a displacement increment of each vertex relative to a last time is greater than a preset threshold value, and if yes, returning to step S2 until the condition is met, otherwise, outputting current coordinates of each vertex and calculating stress and strain; and S4, repeating steps S2-S3 until coordinates of each vertex under temperature fields at all times and stress and strain are obtained. Through the application, problems such as low calculation efficiency, poor convergence, and complex model in LPBF forming stress deformation simulation are solved.

The application provides an omnidirectional variable parameter eddy current tuned mass damper, and relates to the technical field of engineering structure damping, which comprises a support shell, a track guiding system, a counterweight mass system, an eddy current damping system, a spring system and a limiting buffer system; the support shell is used for bearing the tuned mass damper system and is fixed to a building; the track guiding system is used for supporting and guiding the eddy current damping system and the counterweight mass system; the number of counterweight mass plates in the counterweight mass system is adjustable; the eddy current damping system comprises a magnet steel, a conductor plate and an energy storage device and the like components, vibration mechanical energy is converted into electric energy by cutting magnetic induction lines of the conductor plate in a magnetic field, and the electric energy is stored; the spring system is used for buffering the counterweight mass system; the limiting buffer system is arranged at the end of the track guiding system, and extreme movement of the counterweight mass system is limited to prevent equipment damage. The application controls vibration amplitude and vibration frequency in multiple dimensions, and can also realize energy recycling.

The invention discloses a method, a device and equipment for suppressing subsynchronous torsional vibration of a shaft system of a steam turbine synchronous generator unit and a storage medium, which are used for solving the technical problem that the steam turbine synchronous generator unit has the risk of subsynchronous torsional vibration of the shaft system. The method comprises the following steps: establishing a mass-spring system model of the shaft system of the steam turbine synchronous generator unit; the mass-spring system model and a preset synchronous generator set equation are combined, and a critical stable torsional vibration mode is determined; inputting the modal rotation angle increment corresponding to the critical stable torsional vibration modal into an additional control loop of a preset power system stabilizer, and outputting a compensation signal; and superposing the compensation signal with a basic control output signal of the power system stabilizer to obtain a suppression signal which is used for suppressing the shaft system subsynchronous torsional vibration of the steam turbine synchronous generator set.