静态横向补给高架索几何形状的可视化仿真

Visual Simulation of the Shape of Highline Cable in Static Lateral Replenishment

以高架索作为承重索道的横向补给是非常普遍的一类海上干货补给方式,然而目前学术界尚无对高架索进行可视化仿真建模的支撑性研究,针对这一现状,提出一种直观反映海上横向干货补给过程中高架索几何形状变化的仿真模型.仿真模型由算法模块和动画模块两部分构成,二者互相影响互相调用.算法模块的建立以高架索在补给过程中的受力情况为基础,按照高架索所受荷载的不同类型将其细分为分布荷载作用下的算法模块和集中荷载作用下的算法模块两大类来分别建模:前者适用于架设、稳定、调整、卸货、撤回等5个补给阶段,使用经典成熟的悬索计算的抛物线理论来推导各阶段中高架索的相关物理性质的代数表达式,如形状曲线方程、长度、发送端张力和接收端张力等;后者对应运货阶段,使用结构力学理论来完成相关表达式的推导.动画模块的建模运用了Unity软件,依托建模工具的功能特性和相关素材来模拟真实的补给场景.这种仿真模型将定性描述与定量分析相结合、可视化仿真模型与理论仿真模型相结合,既能够演示高架索的几何形状在补给过程中所发生的变化,又能够实时更新相关物理性质的数值或表达式.模型运行结果表明,仿真模型基本可以如实反映高架索的几何形状与其若干物理性质随着补给的推进而变化的过程.

Lateral replenishment in which a highline cable acts as load-bearing cableway is a widely used method of replenishment at sea for solid cargo.However,research on visual simulation modeling of the highline cable is lacking.Therefore,a type of simulation model that visually demonstrates how the shape of the highline cable changes in the process of lateral replenishment at sea for solid cargo is proposed.The simulation model is composed of algorithmic and animatic modules,which may mutually affect and call each other.The algorithmic module is based on forces exerted on the highline cable and can be divided according to the kind of load applied to the highline cable into an algorithmic module for the action of distributed load and concentrated load.The algorithmic module for the action of distributed load deduces the mathematical expressions of some physical properties,such as shape equation,length,and tension of the sending and receiving extremities of the highline cable using the parabola theory of a hanging rope applied to the replenishment stages of erection,stabilization,adjustment,unloading,and withdrawal.The algorithmic module for the action of concentrated load deduces such mathematical expressions using the theory of structural mechanics applied to the replenishment stage of delivery.The animatic module is built using Unity software that simulates actual replenishment scenes via the functions of Unity and available materials.This kind of model links qualitative description with quantitative analysis and combines the visual simulation model with the theoretical simulation model to represent the changes that the shape of the highline cable undergo in the course of replenishment and simultaneously determine the values or equations of such physical properties in real time.The outcomes of executions indicate that this simulation model is capable of demonstrating the changes that the shape and some physical properties of the highline cable undergo with replenishment in detail.