Atomistic Dynamics of Acoustic Emission (AE) Generation in Ultra-Precision Machining (UPM) for Incipient Anomaly Detection

用于早期异常检测的超精密加工 (UPM) 中声发射 (AE) 生成的原子动力学

• 批准号: 1301439
• 负责人: Satish Bukkapatnam
• 金额: $ 20万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1301439&HistoricalAwards=false
• 关键词: Atomistic; Dynamics; Acoustic; Emission; AE

This grant provides funding to explore the feasibility of an approach to relate the generation and propagation of acoustic emission waveforms from atomistic sources with the relevant plastic deformation mechanisms in ultra-precision machining processes, based on adapting recent advances in nanolithography, ray acoustics and material point theories, towards real-time monitoring of surface quality. Ultra-precision machining processes have a broad range of applications in automotive, aerospace, medical, and defense industries. Real-time monitoring of these processes is hampered by low signal-to-noise ratios of conventional sensors, and costs associated with advanced in-situ instruments. Currently, acoustic emission offers a viable means for real-time and high resolution monitoring of these processes. However, physical principles connecting the process microdynamics with acoustic emission waveforms, which are critical for real-time monitoring of anomalies in ultra-precision machining processes, remain elusive. The physical principles and models from this research can be vital for harnessing acoustic emission signals for real-time process monitoring to assure nano-scale precisions and surface quality.If successful, the investigations would lay foundations to advance sensing technologies for real-time quality assurance of ultra-precision manufacturing processes in the vital industries of today's economy. Considerable short-term impact will accrue from active research partnerships with the industry, and involvement of graduate and undergraduate students. The affiliated educational activities will include enriching a graduate course by employing the new experimentation facilities and other research outcomes as part of the lab, as well as by incorporating the results from the proposed research as course modules in process modeling and mechanics tracks.

这笔赠款提供资金，用于探索一种方法的可行性，该方法基于纳米光刻、射线声学和材料点理论的最新进展，用于实时监测表面质量，从而将来自原子源的声发射波形的产生和传播与超精密加工过程中的相关塑性变形机制联系起来。超精密加工工艺在汽车、航空航天、医疗和国防工业中有着广泛的应用。传统传感器的低信噪比以及与先进现场仪器相关的成本阻碍了对这些过程的实时监测。目前，声发射为实时、高分辨率监测这些过程提供了一种可行的手段。然而，将过程微动力学与声发射波形联系起来的物理原理仍然难以捉摸，而声发射波形对于实时监控超精密加工过程中的异常至关重要。这项研究的物理原理和模型对于利用声发射信号进行实时过程监测以确保纳米级精度和表面质量至关重要。如果成功，这些研究将为在当今经济的关键行业中发展超精密制造过程实时质量保证的传感技术奠定基础。与该行业积极的研究伙伴关系以及研究生和本科生的参与将产生相当大的短期影响。附属的教育活动将包括丰富研究生课程，采用新的实验设施和其他研究成果作为实验室的一部分，并将拟议研究的结果作为课程模块纳入过程建模和力学跟踪。