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Accelerated Simulations of Realistic Granular Soils Using PhysX Engine

使用 PhysX 引擎加速模拟真实的颗粒土壤

基本信息

批准号：
1917332
负责人：
Vernon Schaefer
金额：
$ 30.84万
依托单位：
Iowa State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1917332&HistoricalAwards=false
关键词：
Accelerated Simulations Realistic Granular Soils

项目摘要

Granular materials are ubiquitous in nature and in industrial applications; they include sands/gravels, ores, powders, chemicals, pharmaceuticals, and food products. In geotechnical engineering, sands and gravels are critical construction materials and their behavior is strongly related to geohazards, such as landslides and erosion. While numerical modeling of discrete particles is an emerging tool for the study of mechanical behavior of granular materials, rapidly generating and simulating a large number of realistic soil particles to model significant problems is still difficult. This research aims to overcome this limitation by investigating the accuracy and efficiency of a video gaming platform, which features high computational efficiency, in simulation of granular materials. The expected outcome of this research will be a new geo-simulator, which will improve the simulation accuracy, increase the number of realistic particles in simulations, and reduce simulation time. The new geo-simulator can be used in many disciplines and industries that deal with granular materials. For example, it could be used in construction, mining, and agricultural industries to optimize earthmoving machinery such as dump trucks, excavator buckets and harvesters to increase productivity and efficiency. The geo-simulator may also be used in the pharmaceutical, chemical, and food industries to optimize mixing, tablet coating, and separating processes to improve product quality and operational efficiency. With the scale at which granular material is processed in the US and in the world, large cost savings are likely to result. This geo-simulator will be integrated as a medium to reach out to middle-high school students, and the public to increase their interest in geotechnical engineering and STEM fields. This interdisciplinary research project aims to investigate the accuracy and efficiency of a PhysX gaming engine for accelerating simulations of realistic granular soils. The scope of this research relates to five important issues. First, triangular face tessellations will be used in PhysX to precisely preserve sharp corners of realistic particles. Second, the effectiveness of the simplified contacting model in PhysX will be validated by a miniature direct shear test that can be scanned by X-ray Computed Tomography. Third, an image-based shape sculpture technique will be integrated into PhysX that can generate realistic particles based on distributions of particle sizes and shapes. Fourth, PhysX will be extended and customized to include servo-control and post-processing functions to develop a new discrete element simulator GeoPhysX for geotechnical simulations (i.e., laboratory test and landslide simulations). Fifth, systematic parametric studies will be performed using validated GeoPhysX to analyze effects of particle shape and gradation on macro, local, and micro mechanical behavior of granular soils. This project will help to fill the knowledge gap that links micro particle properties and the macro mechanical behavior of granular soils, with the potential to enhance our current understanding of granular soils as construction and load-bearing materials, the porous matrix for flows and storage, and vulnerable components during failures and hazards.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

颗粒材料在自然界和工业应用中无处不在;它们包括砂/砾石、矿石、粉末、化学品、药品和食品。在岩土工程中，砂和砾石是关键的建筑材料，它们的行为与地质灾害（如滑坡和侵蚀）密切相关。虽然离散颗粒的数值模拟是一种新兴的工具，用于粒状材料的力学行为的研究，快速生成和模拟大量的现实土壤颗粒模型的重大问题仍然是困难的。本研究的目的是克服这一限制，调查的准确性和效率的视频游戏平台，具有高计算效率，在模拟粒状材料。这项研究的预期成果将是一个新的地理模拟器，这将提高模拟精度，增加模拟中真实粒子的数量，并减少模拟时间。新的地质模拟器可用于处理颗粒材料的许多学科和行业。例如，它可以用于建筑，采矿和农业行业，以优化土方机械，如自卸卡车，挖掘机铲斗和收割机，以提高生产力和效率。地理模拟器还可用于制药、化工和食品行业，以优化混合、片剂包衣和分离过程，从而提高产品质量和操作效率。随着美国和世界上颗粒材料加工的规模，很可能会节省大量成本。这个地质模拟器将被整合为一种媒介，以接触中学生和公众，以提高他们对岩土工程和STEM领域的兴趣。这个跨学科的研究项目旨在研究PhysX游戏引擎的准确性和效率，以加速模拟真实的粒状土壤。本研究的范围涉及五个重要问题。首先，三角形面镶嵌将在PhysX中使用，以精确地保留真实粒子的尖角。其次，简化的接触模型在PhysX的有效性将被验证的微型直接剪切试验，可以扫描的X射线计算机断层扫描。第三，基于图像的形状雕塑技术将被集成到PhysX中，该技术可以根据颗粒大小和形状的分布生成逼真的颗粒。第四，PhysX将被扩展和定制，以包括伺服控制和后处理功能，以开发用于岩土模拟的新离散元模拟器GeoPhysX（即，实验室测试和滑坡模拟）。第五，将使用验证GeoPhysX进行系统的参数研究，分析颗粒形状和级配对粒状土的宏观，局部和微观力学行为的影响。该项目将有助于填补知识空白，将颗粒土的微观颗粒特性和宏观力学行为联系起来，有可能提高我们目前对颗粒土作为建筑和承重材料的理解，流动和储存的多孔基质，以及故障和危险期间的脆弱部件。该奖项反映了NSF的法定使命，并通过使用评估被认为值得支持基金会的学术价值和更广泛的影响审查标准。