45 results about "Collision response" patented technology

A method and apparatus wherein complex physical interactions and collisions are modeled at a high level of detail while reducing the computational demands placed on the processing system. In one embodiment the method comprising the steps of defining a first object and a second object, each object adapted for colliding with the other object; assigning an interaction type for at least one of the first and second object in response to an object parameter; and selecting between a continuous simulation of a collision and a discrete simulation of the collision in response to the interaction type.

A method of globally analyzing intersections between objects in computer animation includes providing objects represented by meshes, with each of the meshes being formed by a set of vertices, where a set of pairs of vertices defines a set of edges of the mesh. All edges of the meshes are checked to determine if the edges intersect with any of the meshes. An intersection path, formed by the intersection of the meshes, is traced and which vertices that are contained within the intersection path are determined. A polarity of each of the contained vertices is set to indicate that those vertices are contained within the intersection path. The analysis forms the backbone of a collision-response algorithm for unoriented objects such as cloth that is better than previous existing algorithms. The analysis also allows objects to be simulated even when hand-animated elements of the simulation have extreme amounts of interpenetration. Finally, simply displaying the nature and extent of the data found from the analysis provides extremely useful feedback to an end-user.

The invention discloses a method for dynamically simulating a human body and clothing in a computer. The simulation effect of different materials is achieved by setting key steps in physical simulation. The method includes the main steps of modeling the human body, processing a human body model and a clothing model, calculating clothing simulation by using mechanics knowledge, correcting after integration, impact detecting and responding. Based on a traditional mass point spring model, a large bending spring is provided to generate a wrinkle effect, corresponding spring parameters are set according to properties of the different materials, a comprehensive correction strategy is adopted in mass point clothing, and a perfect impact response scheme is provided to take characteristics of all the materials into account. Traditional clothing materials are distinguished through a great deal of parameter measurement and geometric methods, the defects that a traditional method is low in efficiency or poor in flexibility are overcome, and the different materials can be dynamically simulated.

The invention relates to a method for detecting continuous collision based on ellipsoid scanning. In order to avoid a penetrating phenomenon in the process of collision detection and ensure completion of a collision response, the method optimizes algorithm steps on the basis of the conventional ellipsoid scanning method and provides a quick indexing system based on regional marks aiming at a physical engine task allocation mode based on regional division. Additionally, a forecasting mechanism is adopted in the process of the collision detection to effectively reduce the call frequency of the collision detection in a simulation cycle. The optimization of a processing procedure is suitable to be applied to the continuous collision detection in a large-scale virtual environment.

The invention relates to a safety protection method in robot-assisted cardiovascular interventional surgery, comprising: 1) geometrically modeling blood vessels; The curvature of the position point is normalized; 3) According to the curvature and radius information of the blood vessel, the inner area is dynamically divided, and the primary safety protection measures in robot-assisted cardiovascular interventional surgery are established; 4) The guide wire is tracked in real time with the help of an electromagnetic tracker The position of the front end is interpolated and reconstructed using the cardinal spline curve to establish the geometric model of the guide wire; 5) Calculate the inflection point and branch of the blood vessel under the surgical path, and dynamically constrain the advancing speed and angle of the guide wire; 6) Adjust the guide wire Perform collision detection with the vessel wall; 7) predict the collision response according to the collision detection result. Compared with the prior art, the invention has the advantages of stability, reliability, convenient realization, low cost, strong engineering applicability and the like.

The invention relates to an automobile testing device, in particular relates to an airbag head hammer falling static testing device. The head hammer is oriented by rolling a roller wheel on a guide track so as to control the impact point of the head hammer; the elevating height of the head hammer is controlled automatically so as to ensure the speed of impacting the airbag; the explosion of the airbag and the separation of the head hammer from a suspension frame mechanism are controlled automatically, so that the influence of the suspension frame mechanism to the collision response is eliminated; the suspension frame mechanism can adjust the position of the head hammer at the front, the back, the left and the right; and the airbag adjusting mechanism can adjust the inclination angle and the front and the back positions of the airbag. The impact angle and the position of the head hammer to the airbag are adjustable; and the quality of an impact object can be controlled; the collision position, the angle and the mass of the object are ensured to accord with a corresponding automobile model; and the test is good in repeatability effect.

Animating strands (such as long hair), for movies, videos, etc. is accomplished using computer graphics by use of differential algebraic equations. Each strand is subject to simulation by defining its motion path, then evaluating dynamic forces acting on the strand. Collision detection with any objects is performed, and collision response forces are evaluated. Then for each frame a differential algebraic equations solver is invoked to simulate the strands.

The invention discloses a multipoint contact force sense feedback system orienting virtual reality dental department operation training. In the multipoint contact force sense feedback system, a force feedback equipment state reading module (1) reads a handle motion trail of force feedback equipment (44), converts the handle motion trail into a force sense tool terminal pose and outputs the force sense tool terminal pose to a tool model (41) and a force/torque computation module (4); a spherical tree collision detection module (2) carries out collision rejection processing on a dynamic force sense tool sphere tree output by the tool model (41) and a static dentition sphere tree output by a multilayer tooth model (42) by adopting a layering recursion collision detection strategy, so as to obtain all the intersected sphere pairs of leaf nodes; a multipoint contact collision response module (3) processes all the intersected spheres of the leaf nodes by adopting a collision response optimization model, so as to obtain a terminal pose of a graphic tool; and the force/torque computation module (4) processes the terminal pose of the graphic tool according to a generalized spring force model, so as to obtain a feedback force/torque, and the feedback force/torque is acted onto the force feedback equipment (44). The multipoint contact force sense feedback system disclosed by the invention can accurately solve a contact position and a posture of the graphic tool and a virtual dentition surface during continuous collision detection.

The invention discloses a construction method for a collision detection system. The method comprises: firstly, establishing a three-dimensional model of a mechanical part in SolidWorks, and importing the established three-dimensional model into virtual reality software EON Professional; secondly, finishing automatic assembly of parts of the mechanical part by utilizing a 2DText node and a Place node of the software EON Professional; and finally, finishing collision detection of the parts of the mechanical part and detecting collision response during collision by utilizing a CollisionObject node, a Material2 node, a DirectSound node and a Colors element of the software EON Professional. The construction method for the collision detection system can effectively eliminate the penetration phenomenon of existing CAD software in an assembly simulation process of mechanical products, enables a user to feel response when penetration occurs to two parts from visual and hearing perspectives, and has the characteristics of easiness for operation, high authenticity and remarkable effect.

The invention provides a virtual assembly system based on Visual Basic and EON Studio. The virtual assembly system comprises an automatic assembly module, a manual assembly module, a motion simulation module, a collision detection module and an assembly sequence planning module, wherein the five function modules are all integrated in a Visual Basic integrated development tool; the Visual Basic integrated development tool builds the connection with an EON Studio simulation platform through an EonX control; the man-computer interaction can be realized through a mouse and a keyboard; the manual assembly process of a virtual mechanical product is completed; the moving and work process of the mechanical product and the motion transmission mode among all components are simulated; the collision response is made on the part collision in the simulation process; the virtual assembly system can be applied to enterprise mechanical product assembly link development, staff training and mechanical university practice teaching links; and the programming amount is reduced. Meanwhile, the virtual assembly system has the characteristics that the operation is simple; the manufacturing cost is low; and the man-machine interaction performance is high.

The invention discloses a servo mechanism based active force/touch sense feedback system and a work method thereof. The system is composed of a computer, a motion tracking sensor and a force/touch sense feedback mechanism and a controller. Hand motion data is collected in real time through the motion tracking sensor and sent to the computer, and collision detection of the hand and a tool or a control in a virtual environment is conducted. When the hand does not make contact with the tool or the control, the computer conducts hand motion locus prediction and motion planning and drives the force-touch sense feedback mechanism to conduct servo motion; when the tool or the control is operated with the hand, the force/touch sense feedback mechanism tail end drives the corresponding tool or control to reach the target position of a hand operation, touch sense feedback is provided, and meanwhile the computer conducts real-time collision response and force sense generation, drives the force/touch sense feedback mechanism to output force and provides active force sense feedback. By means of the system, the immersion and interaction of a virtual reality system can be improved, the size is small, the flexibility is high, and the system can be applied to the fields of virtual surgery, virtual driving and the like.

A vehicle control device includes an oncoming vehicle detection sensor and a controller that automatically applies brakes to avoid a collision with the oncoming vehicle, under a condition that the own vehicle is at least partially in an opposite lane or a planned path of the own vehicle is at least partially in the opposite lane. The controller sets a virtual area that moves with the oncoming vehicle and that extends in an advancing direction of the oncoming vehicle, and automatically brakes to avoid to avoid a collision. In response to the sensor detecting first and second oncoming vehicles, the controller sets first and second virtual areas, and automatically brakes the own vehicle to prevent coming into contact with the first virtual area and the second virtual area once the own vehicle traverses the opposite lane.

The invention discloses a fast simulation method of superelastic material. The method comprises the following steps: 1) discretizing the three-dimensional model to be simulated is uniformly, and calculating the state information of each discrete point; 2) setting the neighborhood radius delta of the discrete points to construct the neighborhood connection relationship of each discrete point; 3) setting a nonlinear function, an anisotropic function and related material parameters according to the superelastic material to be simulated, and determining a material constitutive model of the three-dimensional model; 4) calculating the deformation internal energy and the corresponding generate internal force according to the material constitutive model and the current state stored at the discretepoint and applying the deformation internal energy and the correspond generated internal force on the discrete point; 5) applying external force, friction force and bending anti-flip force to the discrete points where internal force is applied; then solving the position and velocity of the discrete point at the next time; 6) carrying out collision detection and collision response on the processeddiscrete points, and adjusting the position and speed of the discrete points; 7) repeating 4) to 6) until the simulation ends. The invention can effectively simulate nonlinear and anisotropic phenomena.

The invention discloses a collision response relay. The collision response relay comprises a relay main body; the bottom end of the relay main body is provided with a plurality of fixed contact sheets and a coil terminal; the relay main body comprises a shell; an iron core is arranged in the shell; the exterior of the iron core is provided with a coil; one end of one of the fixed contact sheet is provided with a fixed contact; the fixed contact is arranged in the shell; a movable contact sheet is arranged in the shell; an end portion of the movable contact sheet is provided with a movable contact; the movable contact and the fixed contact are oppositely in a manner that the movable contact and the fixed contact can contact with and go away from each other; an armature is arranged in the shell; one end of the armature is fixed to the movable contact sheet; the armature is connected with an elastic sheet; and one end of the elastic sheet is provided with a collision sensing component. With the collision response relay of the invention adopted, the safety of automobiles in a driving process can be improved.

The invention provides a finite element modeling method for simulating bolt collision fracture failure. The finite element modeling method comprises the following steps that bolt center units are established through beam units, bolt shell units are arranged, material parameters are given to the bolt shell units, the bolt center units are in one-to-one correspondence with nodes of the bolt shell units, and rigid connection is arranged between the corresponding nodes. And a nut model is established, the outer surface of the nut model is divided into nut shell units, and the nut shell units are endowed with material parameters and nut quality. A rigid connection is established between corresponding nodes of the bolt shell unit and the nut shell unit. The bolt shell unit and the nut shell unit are added into contact with an external component. And a preload for each beam unit generated is set in the bolt modeling step. Material parameters are given to the beam units, and corresponding failure force and failure moment limit values are added to the material parameters. The model established by the modeling method is used for simulating the collision response, the simulation result is more accurate, the real vehicle collision frequency is reduced, and the development cost is saved.

The invention discloses an augmented reality interaction method and device suitable for a real object and a storage medium, and the interaction method comprises the following steps: selecting a real object for interaction in a virtual-real mixed space presented by augmented reality equipment; virtually and tightly wrapping a real object, and establishing a virtual wrapping body, wherein each functional area of the real object corresponds to each part of the virtual inclusion; marking each part of the virtual inclusion, defining an interaction mode and content of each part, and marking other real objects in the same mode, wherein a user interacts with a real object in the virtual-real mixed space, actually, an interaction event falls on a virtual inclusion of the real object, and feedback is carried out according to predefined interaction forms and contents of all parts. According to the interaction method, a user can establish an interaction relationship with a real object in an environment where the user is located anytime and anywhere, the real object is conveniently brought into a virtual-real mixed space for interaction, and when the object is moved, the virtual inclusion moves together with the real object according to the collision response of a hand to automatically keep an interaction relationship.