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ChinaVR 2020

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Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Analysis and improvement of panic concept in social force model DING Nanzhe, LIU Tingting, LIU Zhen, WANG Yuanyi, CHAI Yanjie, JIANG Lan Journal of Computer Applications    2021, 41 (8): 2460-2465.   DOI: 10.11772/j.issn.1001-9081.2020101550 Abstract （594）      PDF （1782KB）（286）       Knowledge map    Save Social force model is a classical model in crowd simulation. Since it was proposed in 1995, the model has been widely used and modified. In 2000, the concept of panic degree was added to the model to propose an improved version. Although many studies focus on social force model, there are few studies on this concept. Therefore, some key parameters and the concept of panic degree in the social force model were analyzed, and the change of panic degree was used to explain the phenomenons of "fast is slow" and "herd behavior" in crowd evacuation. To overcome the problem in the original model:very few pedestrians may not follow others or may not evacuate at the exit in some conditions caused by the not detailed enough description of pedestrian perception in social force model, the visual field range description of the pedestrian was added and the self-motion state for the pedestrian was redefined and other methods were performed to optimize the social force model. Experimental results show that the improved model can simulate the crowd's herd phenomenon well and is helpful for understanding the concept of panic degree in social force model. Reference | Related Articles | Metrics Select Modeling technology for maintenance posture of virtual human in narrow space of ship LUO Mingyu, LUO Xiaomeng, ZHU Wenmin, ZHANG Lei, FAN Xiumin Journal of Computer Applications    2021, 41 (8): 2466-2472.   DOI: 10.11772/j.issn.1001-9081.2020101551 Abstract （365）      PDF （1390KB）（351）       Knowledge map    Save To solve the problems of the existing virtual human simulation technology in the ship's narrow space maintenance operations, such as the inefficiency, the need for many manual interventions, and the high cost of simulation, a virtual human posture hybrid modeling and simulation technology was proposed. According to the characteristics of human body maintenance operations in a narrow space, the virtual human posture modeling was divided into two parts:virtual human torso and lower limb posture modeling and virtual human arm posture modeling. Firstly, a narrow space automatic posture matching algorithm based on the posture library was proposed to determine the operation position and posture of the virtual human in narrow space. On this basis, a multi-objective optimization model was established to solve the arm posture and realize the maintenance simulation posture generation. Experimental results with a certain type of ship engine room tank valve maintenance as an example show that the proposed method can realize the automatic positioning and generation of virtual human posture, and can effectively improve the efficiency of maintenance simulation. Reference | Related Articles | Metrics