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- 저자 : ( Yudong Jiang ) (검색결과 5 건)
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Investigation on the Airflow Fields of New Melt-blown Dies with Rectangular Jets
Yudong Wang,Fang Jiang,Wan’e Ning,Sheng Xie,Changchun Jiang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
In order to reduce the fiber diameter and the energy consumption in the melt-blowing process, three new slot dies(slot die with air accelerator, slot die with stabilizers and slot die with extensions) are designed. The airflow fields of thesedies have been numerically calculated and experimentally verified. The results reveal that the slot die with stabilizers and slotdie with extensions have higher average stagnation temperatures, average air pressure and average turbulent kinetic energythan those of the common slot die. Compared with the common slot die, the slot die with air accelerator could increase theaverage stagnation temperature on the spinning line, however, its average pressure is reduced and the average turbulentkinetic energy is locally increased. By comprehensively comparing the average stagnation temperature, average air pressureand average turbulent kinetic energy on the spinning lines of these slot dies, the new slot die with stabilizers is the mostconducive to the attenuation of the melt-blowing fibers and the reduction of energy consumption. The research in this workcan have strong guiding significance for the optimization of die structure and the attenuation of melt-blowing fibers.
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Yudong Xia,Qiang Ding,Aipeng Jiang,Nijie Jing,Wenjie Zhou,Jian Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
Incipient fault detection and diagnosis for centrifugal chillers is significant for maintaining safe and effective system operation. Due to the advantages of simple learning algorithm and high generalization capability, the extreme learning machine (ELM) can identify faults quickly and precisely in comparison to conventional classification methods such as back propagation neural network (BPNN). This paper reports an effective diagnosis method for incipient chiller faults with the integration of kernel entropy component analysis (KECA) and voting based ELM (VELM). KECA was first performed to reduce the dimensionality of the original input data so as to minimize the model complexity and computational cost. Instead of using a single ELM, multiple independent ELMs were adopted in VELM, and then the class label could be predicted based on the majority voting method. Using the experimental data of seven typical faults together with a normal operation, the proposed KECA-VELM fault diagnostic model was trained and further validated. The results show that a better fault diagnosis performance can be achieved using the KECA-VELM classifier compared with the conventional BPNN, ELM and VELM based classifiers. The overall average fault diagnosis accuracy for the faults at the least severity level was reported over 95% based on the proposed method.
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Sliding Mode Robust Control of Hydraulic Drive Unit of Hydraulic Quadruped Robot
Rui Zhu,Qingjun Yang,Yudong Liu,Rizhi Dong,Chunli Jiang,Jiaxing Song 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4
This paper focuses on the position control of the quadruped robot hydraulic drive unit (HDU). The proposed control strategy has the advantages of excellent output tracking performance, strong robustness, no chattering and low computational complexity. HDU has the characteristics of nonlinearity and parameter uncertainty, coupled with unpredictable external interference, which makes it difficult to achieve precise position control. In this paper, we first establish the mathematical model of the HDU based on the actual parameters and obtain the state space of the system. Through the pole placement, the simplified system can easily achieve the expected control goal. Then, the state equation of the error system is constructed, and the nonlinearity, parameter uncertainty and external interference of the HDU are summarized as the matched and unmatched uncertainties of the system. The integral sliding mode control (ISMC) is used to derive the control law, and the response characteristics of the system when pole placement and state feedback H∞ control are used for the nominal control are compared. It can be concluded that the system with state feedback H∞ control for nominal control has stronger robustness and can resist the unmatched uncertainties. Finally, the control law of the simplified system is used as feedforward and combined with the ISMC of the error system, the output tracking control framework of the HDU is proposed. Simulations and experiments show that the proposed control method has excellent tracking performance and strong robustness.
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Piezo2: A Candidate Biomarker for Visceral Hypersensitivity in Irritable Bowel Syndrome?
( Tao Bai ),( Ying Li ),( Jing Xia ),( Yudong Jiang ),( Lei Zhang ),( Huan Wang ),( Wei Qian ),( Jun Song ),( Xiaohua Hou ) 대한소화기기능성질환·운동학회 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.3
Background/Aims Currently, there exists no biomarker for visceral hypersensitivity in irritable bowel syndrome (IBS). Piezo proteins have been proven to play an important role in the mechanical stimulation to induce visceral pain in other tissues and may also be a biomarker candidate. The aim of this study was to test the expressions of Piezo1 and Piezo2 proteins in the intestinal epithelial cells from different intestinal segments and to explore the correlation between Piezo proteins expression and visceral pain threshold. Methods Post-infectious IBS was induced in mice via a Trichinella spiralis infection. Visceral sensitivity was measured with abdominal withdrawal reflex to colorectal distention. Inflammation in the small intestine and colon was scored with H&E staining. Expression location of Piezo proteins was confirmed by immunohistochemistry. Abundance of Piezo proteins were measured with real-time reverse transcriptase polymerase chain reaction. Results Piezo1 and Piezo2 proteins were expressed in the intestinal epithelial cells. The expression levels of Piezo1 and Piezo2 were abundant in the colon than the small intestine (P < 0.001 for Piezo1, P = 0.003 for Piezo2). Expression of Piezo2 in the colon significantly correlated to the visceral sensitivity (r = -0.718, P = 0.001) rather than the mucosal inflammation. Conclusion Piezo2 is a candidate biomarker for visceral hypersensitivity in IBS. (J Neurogastroenterol Motil 2017;23:453-463)
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Xinyu Qu,Junjun Qiu,Lili Jiang,Xiaorong Qi,Guonan Zhang,Weiwei Feng,Yudong Wang,Yincheng Teng,Xipeng Wang,Xiaoqing Guo,Keqin Hua 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.2
Background: The impact of para-aortic lymphadenectomy (PALD) on prognosis and quality of life (QoL) for IB2-IIA2 cervical cancer patients remain controversial. And whether intraoperative frozen pathology exam on common iliac lymph nodes could help predict para-aortic lymph node (PALN) metastasis was unanswered with high-level evidence. Methods: A multi-center, randomized controlled study is intended to investigate the effect of PALD on the prognosis and QoL in cervical cancer patients and to assess the value of intraoperative frozen pathological evaluation of common iliac nodes metastasis for the prediction of PALN metastasis. After choosing whether to receive intraoperative frozen pathological examination of bilateral common iliac lymph nodes, eligible patients will be randomly assigned (1:1) to receive PALD or not. The primary end point is 2-year progression-free survival (PFS). The secondary end points include 5-year PFS, 2-year overall survival (OS), 5-year OS, adverse events (AEs) caused by PALD, AEs caused by radiotherapy and QoL. A total of 728 patients will be enrolled from 8 hospitals in China within 3-year period and followed up for 5 years.
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