|
|
Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2021 Vol.22 No.12 P.1551-1558
Multiple knowledge representation for big data artificial intelligence: framework, applications, and case studies
Abstract: In this paper, we present a multiple knowledge representation (MKR) framework and discuss its potential for developing big data artificial intelligence (AI) techniques with possible broader impacts across different AI areas. Typically, canonical knowledge representations and modern representations each emphasize a particular aspect of transforming inputs into symbolic encoding or vectors. For example, knowledge graphs focus on depicting semantic connections among concepts, whereas deep neural networks (DNNs) are more of a tool to perceive raw signal inputs. MKR is an advanced AI representation framework for more complete intelligent functions, such as raw signal perception, feature extraction and vectorization, knowledge symbolization, and logical reasoning. MKR has two benefits: (1) it makes the current AI techniques (dominated by deep learning) more explainable and generalizable, and (2) it expands current AI techniques by integrating MKR to facilitate the mutual benefits of the complementary capacity of each representation, e.g., raw signal perception and symbolic encoding. We expect that MKR research and its applications will drive the evolution of AI 2.0 and beyond.
Key words:
机构：1浙江工业大学，机械工程学院，中国杭州，310023；2浙江大学，流体动力与机电系统国家重点实验室，中国杭州，310027；3浙江工业大学，特种装备制造与先进加工技术教育部/浙江省重点实验室，中国杭州，310023
目的：两级换向阀通常采用比例先导控制技术，其缺点是存在死区、泄漏和先导阀运动质量大等问题，难以保证主阀的快速响应性能。因此，本文旨在提出一种采用两个独立高速开关阀的切换先导技术替代传统的先导比例阀，以提高主阀的动静态性能。
创新点：1.设计一种以高速开关阀组为先导桥路的新型两级液压阀；2.设计基于分段式比例积分微分（PID）的主阀芯位移控制算法；3.运用切换先导技术，明显改善主阀的动静态性能。
方法：1.通过理论分析研究先导级供油压力（公式(16)和(17)）和高速开关阀驱动频率（公式(19)和(20)）对主阀动静态性能的影响；2.在先导级采用自适应供油压力驱动算法（图7），而在主级采用分段式PID主阀芯位移控制算法（图10）；3.通过实验分析，验证本文提出的切换先导技术的控制效果（图12~15）。
结论：1.通过理论分析和实验论证，证明了切换先导技术方案的可行性；2.先导级供油压力和高速开关阀驱动频率对主阀动态性能和控制精度有很大影响。3.通过增大先导级供油压力，可以提高主阀21.5%的快速响应性能，但同时会造成较大的稳态误差。4.通过增加高速开关阀的驱动频率，可以将主阀的稳态误差控制在20μm内，并提高16.7%的静态性能。
关键词组：
References:
Open peer comments: Debate/Discuss/Question/Opinion
<1>
DOI:
10.1631/FITEE.2100463
CLC number:
Download Full Text:
Downloaded:
5033
Download summary:
<Click Here>Downloaded:
854Clicked:
4569
Cited:
0
On-line Access:
2021-12-23
Received:
2021-09-30
Revision Accepted:
2021-10-07
Crosschecked:
2021-11-22