Search

CN-121706295-B - Spring damping parameterization modeling system

CN121706295BCN 121706295 BCN121706295 BCN 121706295BCN-121706295-B

Abstract

The invention relates to the technical field of computational multi-body dynamics and computer aided engineering simulation, in particular to a spring damping parametric modeling system which comprises an excitation sensing and manifold initializing unit, a topology-parameter bidirectional transient coupling engine, an adaptive reduced manifold solving unit and a self-adaptive reduced manifold solving unit, wherein the excitation sensing and manifold initializing unit is used as an input stage of the system for coping with non-steady working conditions, the system is configured to monitor external excitation signals in real time and generate a dynamic topology state matrix based on the current transient geometrical state of the system, the topology-parameter bidirectional transient coupling engine is used for generating a transient stiffness/damping field matrix representing parasitic stiffness effect and performing degree of freedom locking on an overrun node to modify a topology connection matrix to generate reduced topology state data, and the self-adaptive reduced manifold solving unit is used for transmitting the solution back to the excitation sensing and manifold initializing unit as a feedback signal.

Inventors

  • SHAO NAIXIANG
  • FENG HUAJIAN

Assignees

  • 杭州通用弹簧有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (6)

  1. 1. A spring damping parametric modeling system, comprising: The excitation sensing and manifold initializing unit is used as an input stage of the system for coping with non-steady working conditions, is configured for monitoring external excitation signals in real time, and constructs a dynamic state space equation containing generalized coordinates, topological adjacency and physical parameter mapping relations based on the current instantaneous geometrical state of the system when detecting that the signals have spectrum centroid mutation, so as to generate a dynamic topological state matrix; The topological-parameter bidirectional transient coupling engine is used as a core unit for executing real-time interlocking of geometric configuration and physical attribute, is configured to receive the dynamic topological state matrix, run geometric driving physical logic, update system rigidity and damping matrix through nonlinear constitutive mapping based on deformation degree of the geometric configuration, generate transient rigidity/damping field matrix representing parasitic rigidity effect, further run physical locking geometric logic, solve transient internal force vector of a connecting point based on the transient rigidity/damping field matrix, compare the vector module value with a local locking threshold value of the connecting point, execute degree of freedom locking on an overrun node to modify topological connection matrix, and generate reduced topological state data; An adaptive reduced order manifold solving unit configured to receive the reduced order topology state data, identify regions marked as locked therein and incorporate rigid node variables to dynamically reduce the computational matrix dimensions, solve for a system state response solution comprising displacement, velocity and acceleration, and transmit the solution back to the excitation sensing and manifold initializing unit as a feedback signal; the geometry driven physical logic in the topology-parameter bidirectional transient coupling engine specifically comprises: receiving node displacement and rotation data of a system in real time, calculating the change rate of geometric coordinates, and judging that the configuration is subjected to micro deformation or large-angle folding when the change rate is monitored to exceed a preset linear range; Based on the current geometric distortion degree, element values in a system stiffness matrix and a damping matrix are updated instantaneously, and an energy dissipation path is remolded, so that the transient stiffness/damping field matrix is obtained; the physical locking geometric logic in the topology-parameter bidirectional transient coupling engine specifically comprises: comparing the model value of the transient internal force vector of each connecting point solved based on the dynamics operation with a local locking threshold value of the connecting point serving as a critical force value of the connecting structure for keeping the flexible motion state; and when judging that the modulus value of the transient internal force vector exceeds the local locking threshold value of the connecting point, judging that the connecting point enters a quasi-rigid state and triggering a degree-of-freedom locking instruction.
  2. 2. The spring damping parametric modeling system of claim 1, wherein the specific logic of the excitation sensing and manifold initialization unit to determine sudden spectral centroid changes is: Calculating the variation of the spectrum centroid of the external excitation signal in unit time, if the variation exceeds a preset threshold, judging that the non-stationary working condition is entered, stopping calling a preset static stiffness matrix at the moment, and starting the construction flow of the dynamic state space equation.
  3. 3. The spring damping parametric modeling system of claim 1, wherein the construction of the dynamic state space equation is characterized by: The spring stiffness coefficient and the damping coefficient are defined as intrinsic state variables which evolve in real time along with geometric topological state variables, and are not preset constants, so that a three-dimensional dynamic mapping relation among generalized coordinates, topological adjacency and physical parameters is established.
  4. 4. The spring damping parametric modeling system of claim 1, wherein the degree of freedom lock instruction is specifically executed in the following manner: the topological connection matrix of the system is forcedly modified by adding Lagrangian multiplier constraint or directly executing Gaussian-elimination-based matrix row-column merging operation, so that the associated nodes are combined into the same motion rigid body in the current time step, and the relative motion freedom degree among the nodes is temporarily frozen.
  5. 5. The spring damping parametric modeling system of claim 1, wherein the reduced order processing logic of the adaptive reduced order manifold solution unit is: Based on the geometrical freedom degree of physical mechanical state locking, the self-adaptive order reduction operation is executed on the mathematical solution level, and the number of equations to be solved and the condition number of the rigidity matrix are dynamically reduced on the premise of not losing the flexibility precision by combining node variables which temporarily become rigid.
  6. 6. The spring damping parametric modeling system of claim 1, further comprising a virtual sensing and state reconstruction unit for mining data values with intermediate computational variables configured to simultaneously receive topology distortion data and parameter evolution history generated by the topology-to-parameter bi-directional transient coupling engine; The topology distortion data generated in the calculation process is used as a virtual sensing source, reverse deduction is executed based on the physical mapping relation between the distortion degree of the parameterized topology and the internal stress, and the stress distribution state in the physical system is calculated; An enhanced simulation report containing the conventional dynamic response and the deduced internal stress cloud image is output.

Description

Spring damping parameterization modeling system Technical Field The invention relates to the technical field of computational multi-body dynamics and computer aided engineering simulation, in particular to a spring damping parameterized modeling system. Background The complexity of the working condition puts extremely high demands on the accuracy of system dynamics modeling and simulation, especially in the aspect of processing physical attribute evolution caused by structural deformation; At present, a traditional lumped parameter method is generally adopted for modeling dynamics simulation of the system, the method is generally based on rigid node assumption, a spring stiffness coefficient and a damping coefficient are regarded as preset fixed constants or are obtained through a simple static table look-up mode, in terms of calculation logic, a traditional simulation architecture usually regards a geometric topological state and a physical parameter as mutually independent decoupling variables, namely physical properties cannot be changed in an intrinsic way along with real-time distortion or folding of a geometric configuration, the traditional modeling method depending on the static parameters and geometric object understanding coupling has obvious defects when facing high-frequency impact or large deformation working conditions, due to the fact that parasitic stiffness effects generated due to geometric nonlinearity are ignored, the fact that the system cannot truly reflect driving effects of the physical properties by the configuration, not only can energy virtual increase phenomenon violating physical laws occur in simulation results, but also can enable differential equation sets to present strong rigidity characteristics due to severe fluctuation of transient internal forces, so that the divergence of numerical calculation is extremely easy to be caused, the convergence and high fidelity of the simulation results are difficult to ensure, therefore, how a flexible multi-body system is subjected to realization of the problem of geometrical model-state real-time geometrical expansion due to geometrical expansion caused by geometrical non-steady non-neglect working conditions under high-frequency conditions is solved. Disclosure of Invention In order to solve the technical problems, the invention provides a spring damping parametric modeling system, which specifically comprises the following steps: The excitation sensing and manifold initializing unit is used as an input stage of the system for coping with non-steady working conditions, is configured for monitoring external excitation signals in real time, and constructs a dynamic state space equation containing generalized coordinates, topological adjacency and physical parameter mapping relations based on the current instantaneous geometrical state of the system when detecting that the signals have spectrum centroid mutation, so as to generate a dynamic topological state matrix; The topological-parameter bidirectional transient coupling engine is used as a core unit for executing real-time interlocking of geometric configuration and physical attribute, is configured to receive the dynamic topological state matrix, run geometric driving physical logic, update system rigidity and damping matrix through nonlinear constitutive mapping based on deformation degree of the geometric configuration, generate transient rigidity/damping field matrix representing parasitic rigidity effect, further run physical locking geometric logic, solve transient internal force vector of a connecting point based on the transient rigidity/damping field matrix, compare the vector module value with a local locking threshold value of the connecting point, execute degree of freedom locking on an overrun node to modify topological connection matrix, and generate reduced topological state data; An adaptive reduced order manifold solution unit configured to receive the reduced order topology state data, identify regions marked as locked therein and incorporate rigid node variables to dynamically reduce the computational matrix dimensions, calculate a system state response solution comprising displacement, velocity and acceleration, and transmit the solution back to the excitation sensing and manifold initialization unit as a feedback signal. Preferably, the specific logic of the excitation sensing and manifold initialization unit for determining the spectrum centroid mutation is as follows: Calculating the variation of the spectrum centroid of the external excitation signal in unit time, if the variation exceeds a preset threshold, judging that the non-stationary working condition is entered, stopping calling a preset static stiffness matrix at the moment, and starting the construction flow of the dynamic state space equation. Preferably, the construction of the dynamic state space equation is characterized by: The spring stiffness coefficient and the damping coefficient are defined