33 results about "Collision dynamics" patented technology

The invention relates to a multi-functional and one-stop type remote control design, the simulation system and method thereof wherein the system comprises: a first remote operation control station, a second remote operation control station, a system general control station, a high-dimensional dynamic simulation server, a rigid mechanical arm, a joint control computer, a virtual reality 3D simulation and video acquisition server, a flexible mechanical arm, another joint control computer, a visual system and a circular screen. The invention can work in four modes: mathematic simulation tests based on manual simulation manual remote control, simulation tests based on the manual remote operation control of mechanical arms on real ground, space robot capturing the inserted collision dynamics and control tests, and performance verification of flexible mechanical arms and the flexible parameter identifying tests. According to the invention, one-stop solutions can be provided to the design, simulation and test of remote operation control.

The invention relates to a complete automobile collision simulation method on the basis of the parameterization design and belongs to the field of a nonlinear finite element and nonlinear multi-body dynamics. The method comprises the following steps of: calculating collision force and a stroke of each power-absorbing component by nonlinear finite element software; according to series/parallel power-absorbing characteristics of the power-absorbing components, determining an equivalent total rigidity of power adsorption devices between carriages; then establishing a complete automobile collision dynamic performance analysis model on the basis of the parameterization design; and combining the complete automobile collision dynamic performance analysis model with constraint conditions to obtain an optimal combination of the power-absorbing characteristics of the power-absorbing components so as to obtain the optimal values of motion and a longitudinal load of each carriage in the complete automobile collision process. In the method, the nonlinear finite element and the nonlinear multi-body dynamics are combined to carry out complete automobile collision simulation research; the nonlinearity and the elastic plastic deformation of a material are simulated by the established model; and meanwhile, the collision simulation analysis of an automobile head is expanded to the complete automobile.

The invention discloses a piezoelectric sensor-based on-line measurement device and method for particle size distribution, which belong to the field of gas-solid two-phase flow on-line measurement technique. The on-line measurement device is characterized in that: a collision induction probe is inserted in the middle of a gas-solid two-phase flow pipeline; a piezoelectric sensor is arranged on the collision induction probe; a signal conditioning plate and a data acquisition module are connected with the piezoelectric sensor and a signal processing system; when solid particles are collided with the collision induction probe, the piezoelectric sensor senses a particle collision signal and sends the particle collision signal to the signal conditioning plate and the data acquisition module; and the particle size distribution is obtained through signal processing software and a collision particle model. The device has the characteristic that the piezoelectric sensor is utilized to obtain the collision signal of small particle collision directly so as to realize real-time monitoring on the particle size distribution; the influence of background noise on the collision signal is reduced; and a collision dynamics principle is utilized to build a mathematical model of the collision signal and the particle size, so that the size distribution of measured particles in the pipeline is obtained.

The invention belongs to the field of road traffic safety. In order to provide a method for traffic safety evaluation during phase switching and achieve the purpose, the invention adopts the technical scheme that the method for evaluating traffic safety of signal intersection during phase switching facing an operation management stage comprises the following steps of: calculating encountering time difference PET, wherein PET=(Y+AR+te)-tc-Te; calculating collision loss of momentum, assuming that two cars collide with each other by keeping the original speed, according to the collision kinetic theory, calculating the loss of momentum before and after collision according to formula 5, wherein the system collision before momentum Pm; calculating the collision occurrence probability P; and carrying out evaluation on the traffic safety of the intersection during phase switching. The method is mainly applied to the design of roads meeting the requirement of traffic safety.

The invention relates to a train collision energy managing system and a designing method. The train collision energy managing system comprises a train hook buffering device, a crushing tube, an end energy absorbing device and a train middle structure with enough rigidity, the train hook buffering device is matched with a train, and the energy is absorbed through the cooperation of the structures in the train collision process. According to the designing method, a numerical model is established according to the actual situation, simulating calculation is carried out, the calculation result is processed and analyzed, the dynamics characters of the train in the driving direction are obtained, a curve and parameter values are output, a most reasonable output curve is obtained, and the reasonable train collision energy managing system is obtained according to the output curve. The energy in the collision process is absorbed through the cooperation of the structures, the train collision energy managing system is reasonable in structure, safe and reliable, the collision dynamics characters of the train in the driving direction are accurately simulated, the design of the train collision energy managing system is guided reasonably, the design faults are effectively reduced, the designing time is saved, and the designing efficiency is improved.

The invention relates to a vehicle collision dynamic test device and method. The vehicle collision dynamic test device comprises a test bed and a tested vehicle, wherein the tested vehicle runs along a track. The vehicle collision dynamic test device is characterized by further comprising a protective device, the protective device extends in the longitudinal direction of the tested vehicle and is wholly portal-shaped, and the tested vehicle runs in the space defined by the protective device. The vehicle collision dynamic test device is simple and reasonable in whole structure and convenient to install and operate and can effectively ensure the safety of a multiple-vehicle collision dynamic test and the stability of the whole structure. Multiple-vehicle-body longitudinal dynamic test study can be performed, study on contents of longitudinal and vertical dynamic tests of multiple vehicle bodies can be further achieved through simple turnover and inversion of the protective device, study on different property tests can be completed within short time, the efficiency of test study can be improved, test cost can be effectively saved, a basis can be provided for vehicle dynamic simulating calculation, and further the reliability of a train energy distribution scheme can be ensured.

The embodiment of the invention provides a collision force minimizing method for a space flexible manipulator. The method comprises the steps that according to a joint space kinetic model of the spaceflexible manipulator, motion response of the space flexible manipulator under the collision force action is obtained; according to the joint space kinetic model and motion response of the space flexible manipulator, a collision kinetic model of the space flexible manipulator is obtained; according to the collision kinetic model of the space flexible manipulator, a collision force minimizing strategy of the space flexible manipulator is obtained. According to the technical scheme, the collision kinetic model of the space flexible manipulator can be obtained so as to accurately describe the collision process of the space flexible manipulator, and collision force minimizing of the space flexible manipulator can be achieved, so that the damage degree of contact collision to the space flexiblemanipulator is reduced, and the use cost is reduced.

The invention discloses a contactor bounce feature calculation method considering a thermal field effect. The contactor bounce feature calculation method comprises the following steps: firstly, establishing a thermal field mathematical model, an electromagnetic feature mathematical model and a vibration collision mechanical model of a contactor; then establishing a thermal field finite element model, an electromagnetic finite element model and a vibration collision dynamics numerical model of the contactor; naming the thermal field finite element model, the electromagnetic finite element modeland the vibration collision dynamics numerical model of the contactor respectively as a thermal field module, an electromagnetic module and a vibration collision module; carrying out module connection on MATLAB/Simulink according to an action relation data interaction mode among electric-magnetic, electric-magnetic-thermal, and electric-magnetic-structural field; and finally, calculating the bounce feature of the contactor according to an electric-magnetic-thermal-structural multi-physical field model. The contactor bounce feature calculation method has key significance for perfecting the establishment of the contactor bounce model and deeply carrying out multi-physical field coupling calculation and bounce mechanism research on the contactor.

The invention relates to a method for solving seismic collision reaction parameter complexity of a building structure, and belongs to the technical field of civil engineering. The method comprises thefollowing steps: S1, constructing a collision force model; S2, constructing an adjacent structure collision dynamic equation; And S3, applying a dimension analysis method. According to the method, single variables are mutually combined into a small number of dimensionless variables, and the function relationship among all sets of dimensionless variables is obtained, so that the analysis process is simplified, the essence of the problem is defined, and the complex problem is explained simply and clearly. A dimensionless collision reaction mathematical model of adjacent structures under the action of strong earthquake is established, dimensionless parameters with a small number and clear physical significance are used for representing structure collision reaction, clear and comprehensive structure collision reaction laws are revealed, and meanwhile the self-similarity of the structure collision reaction is revealed.

The invention discloses an ANN-based gas turbine damping blade structure equivalent stiffness damping analysis method. The method comprises the following steps: 1) establishing a friction-collision dynamic coupling damping model suitable for describing the contact state of a dry friction damping piece; 2) solving a nonlinear forced response of the blade by using a time-frequency interaction algorithm; 3) calculating equivalent stiffness and an equivalent damping coefficient; and 4) building ANN fitting equivalent stiffness and equivalent damping change curves. According to the method, the collision-friction dynamic coupling damping model considering the variable positive pressure is established, meanwhile, curve fitting is conducted through a universal ANN, and extra calculation consumption caused by different fitting formula forms of different dry friction damping models in a traditional method is avoided; in addition, according to the method, the fitting result of the current network is used for guiding generation of other networks by applying a transfer learning method, so that the problems of low fitting efficiency and low fitting precision of a traditional algorithm when variable parameters or sample size is small can be effectively solved.

The invention relates to an LS-Dyna based flying net-target collision dynamic analysis method, which uses the nonlinear finite element analysis software ANSYS/LS-Dyna for the typical flying net-targetrigid-flexible collision dynamics analysis, and comprises the steps of establishing a flying net-target collision dynamic model in the LS-Dyna; carrying out the data processing on the calculation result of the LS-Dyna in MATLAB; analyzing the characteristics during the flying net-target collision process. Compared with the prior art, the method is simpler than the traditional theoretical analysismethod, and the flying net carried by the multi-agent can better control the multi-agent to complete the corresponding task. By the flying net-target collision dynamic model established through the ANSYS/LS-Dyna, the traditional rigid-flexible collision theory also can be verified relatively.

The invention discloses an anchor chain stowing and stacking simulating and anchor chain locker volume redundancy analyzing method. The analyzing method comprises steps as follows: a virtual prototype of a three-dimensional anchor chain stowing model is established according to size parameters of an anchor chain locker, anchor chains, a chain guiding roller, an anchor gear wheel, an anchor chain tube, an anchor rod, an anchor crown and an anchor mouth, multi-rigid-body contact-impact dynamics simulation is performed on the three-dimensional anchor chain stowing model, a mathematical model for chain stacking in the anchor chain locker is established according to geometrical stacking morphology of the anchor chains, quantitative regression analysis is performed on the anchor chain stacking volume, redundancy analysis is performed on the anchor chain locker volume according to a result of quantitative regression analysis, and optimal volume design of the anchor chain locker is conducted. According to the anchor chain stowing and stacking simulating and anchor chain locker volume redundancy analyzing method, the mathematical model for chain stacking in the anchor chain locker is established according to the geometrical stacking morphology of the anchor chains, so that the space utilization rate of a ship compartment is greatly increased, and the reliability of arrangement of whole anchor system parts and design of the anchor pulling motion is digitally verified through dynamic simulation and quantitative analysis of anchor chain stowing and stacking.

The invention discloses a contact dynamics simulation method and system for a flexible multi-finger picking manipulator. The method comprises the following steps: reading in a system model and topological data; controlling the manipulator model to execute a grabbing action, solving kinetic parameters of the manipulator model based on non-collision dynamics, and calculating vibration and deformation of the manipulator model; judging whether collision is generated between the manipulator model and the fruit model or not and forming a collision pair; and when the manipulator model collides with the fruit model, judging the state of a collision pair, and calculating the dynamic response quantity of the manipulator model. According to the invention, the collision contact process of the manipulator model and the fruit model in the grabbing process can be simulated so as to capture the movement speed and deformation of the finger part of the picking manipulator, the collision force, the position of the collision point, the contact state switching of multiple viscous-sliding switching, viscous positive and negative micro sliding and the like of the collision point in the contact process, and a basis can be provided for motion control of a picking manipulator in reality.