51 results about "Crowd simulation" patented technology

The invention discloses a crowd-evacuation simulating method based on an extended BDI model. The crowd-evacuation simulating method, on the basis of the extended BDI model and with the cellular automaton and multi-agent technologies, can simulate the crowd evacuation in a public place in emergency (e.g. a fire, etc.) according to the plane layout of a building. The extended BDI structure provides a certain support for the factors in the spiritual aspect, so the method fully considers the influence of the psychological state of the people on the evacuation in the process of crowd simulation; the method is used for simulation of a crowd with incomplete environmental information; and the method can conform better to the practice. The method has an extensive application prospect in simulation studies of safe and fast evacuation of a large crown in a building and can test design proposals or responding proposals, and therefore the invention is an economical and feasible crowd-evacuation simulating method.

The invention provides a crowd evacuation simulation system based on a composite potential energy field. An improved potential energy field model is adopted for the system, a traditional potential energy field under Dirichlet boundary conditions is linearly combined with a potential energy field under Neumann boundary conditions, a local potential energy field for solving collision prevention problems between people is added into the combined potential energy field, and thus the composite potential energy field is obtained; by combining an update strategy of pedestrians and a pedestrian speed control method, the simulation system of personnel evacuation in emergency on different scales of scenes can be established according to the layout of the actual scene. In the crowd simulation process, influences of path plans of moving individuals on the evacuation are fully considered, and the potential energy field method can play a certain role in removing the influence factor. The system has extensive application prospects in research on simulation of safe and fast evacuation of a large number of personnel on difference scales of scenes, the design defects on the scenes can be found, and the crowd evacuation simulation system can assist in making execution schemes in emergency and is economically feasible.

The invention discloses a dynamic data driven modeling and simulation method for crowd evacuation and transportation behaviors in a sudden-onset disaster. According to the method, real-time disaster information is acquired by analyzing high resolution remote sensing images, a simulation model of a landslide and other natural disasters is used for outputting virtual data about disaster evolution, a crowd simulation platform describes individual behaviors on a disaster circumstance, and then real-time online modeling of the landslide disaster is achieved. A decision is made for the individual behaviors according to environment information by describing individuals through several different attributes and defining several different environment description attributes. Experiments prove that through the method, better crowd evacuation efficiency and availability are achieved in an actual rescue activity in the landslide and other natural disasters.

The invention discloses a user-oriented planned virtual crowd simulation framework. The user-oriented planned virtual crowd simulation framework comprises a group, triggers, a motion range limiter and a cloud control end. The group is defined and described by a staff composition module, an activity range module, an objective module and an individual behavior and group behavior module and used for simulation of group behaviors so that simulation of various complex group behaviors is achieved. The triggers comprise the path point trigger, the flow trigger, the time trigger, the speed trigger and other triggers and are used for planning crowd paths and determining path topological information and perceptual information of crowd behaviors. The activity range limiter is used for providing position information of static barriers in the environment. The cloud control end is used for planning optimal paths without congestion for crowds according to the path topological information specified by users and the objective of the group. The user-oriented planned virtual crowd simulation framework has good verisimilitude and real-time performance, high flexibility and convenient and fast operability and can simulate verisimilar virtual crowd behaviors on various scenes according to intentions of the users.

A method of computing a collision-free velocity (117, 217) for an agent (110) in a crowd simulation environment (100) comprises identifying a quadratic optimization problem that corresponds to the collision-free velocity, and finding an exact solution for the quadratic optimization problem by using a geometric approach.

The invention discloses a digital simulator for AMS risk assessment. The digital simulator comprises a crowd simulation module, a measurement interference simulation module and an AMS risk assessment module. The crowd simulation module is used for creating simulation crowds with different hypoxia tolerance capacities by applying a mathematical model of a human hypoxia stress system and a plurality of instance experiment data. the measurement interference simulation module is used for simulating measurement interference and deep respiration physiological interference in the SpO2 information, and superposing simulated interference signals onto the SpO2 generation curve of the simulated crowd; and the AMS risk assessment module obtains indexes used for assessing AMS risks, and the indexes are designed based on parameters of the identified model and used for representing the real hypoxia adaptability of different virtual crowds. According to the AMS risk assessment method, richer research data can be obtained for AMS risk assessment algorithm research, and effective and reliable AMS risk assessment is realized.

Pedestrian movement and the mutual relation between pedestrians and the environment are studied through crowd simulation, and a method is used for pre-event prediction or post-event inspection for urban infrastructure planning, large public activity planning, emergency evacuation of emergencies and the like. According to the method, common behaviors such as pedestrian avoidance, congestion, congestion, attraction and repulsion in real life can be simulated by constructing mechanical models between pedestrians and between pedestrians and the environment, and the movement mode of pedestrians indifferent scenes can be simulated by combining the particularity of pedestrians in different scenes. According to the method, the inter-group avoidance behavior and the coordination behavior of the sub-group in the group are added into the model; the avoidance behaviors in different environments can be simulated, and if the sub-groups are forced to be separated in the avoidance process, the different rows of sub-groups can be kept in central symmetry by adding the force that the rear row of sub-groups get close to the front row of sub-groups, and a certain distance beneficial to walking is kept. On one hand, the current crowd simulation is widely applied to the fields of travel, fire protection, buildings and the like, and the quality of a crowd simulation result meets the requirements ofreality and rapid visualization; and on the other hand, the model better conforms to real pedestrian behaviors, and special phenomena under different attribute pedestrians and scenes can be simulatedby adjusting parameters, so that the model has very high social application value.

The invention discloses a virtual reality crowd simulation method and system based on avoiding the uncanny valley effect, including avoiding the "uncanny valley" effect in vision and the "uncanny valley" effect in touch. In terms of avoiding the visual "uncanny valley", a virtual character library module is added. In terms of avoiding the tactile "uncanny valley", a character sound and environmental sound collection library module and a collision visual blur module are added to effectively reduce and avoid the visual and tactile "uncanny valley". "The discomfort and loss of immersion brought to people, thus making the crowd simulation more human-like and natural, more immersive and more authentic.

The invention relates to a target line-based advancing target arrival judgment method in crowd simulation, which expands a crowd advancing target from a target point to a target line / target line segment, and takes arrival near the target line or crossing the target line as a judgment basis for target arrival. The algorithm can effectively alleviate congestion and an 'enclosure' effect near a target point caused by taking the 'point' as a target and a large number of people simulated by a computer, so that the computer simulation of crowd behaviors is more realistic.