检索结果-南通市图书馆

Journal of Ocean University of China 2021年第4期20卷 811-822页

作者： LIU Wencheng wang shuqing College of Engineering Ocean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China

Axial and hoop stiffness can describe the elastic responses of reinforced thermoplastic pipes(RTPs)subjected to axisymmetric loads,such as tension,compression,pressure,and crushing ***,an accurate analytical prediction cannot be provided because of the anisotropy of RTP *** the present study,a stiffness surface method,in which the analytical expressions of the axial and hoop stiffness are derived as two concise formulas,is *** axial stiffness formula is obtained by solving the equilibrium equations of RTPs under a uniaxial stress state based on the homogenization assumption,whereas the hoop stiffness formula is derived from the combination of the elastic stability theory,the classical lamination theory,and NASA SP-8007 *** verify the proposed method,three types of RTPs are modeled to conduct the quasi-static analyses of the tension and crushing *** consistency between numerical and analytical results verifies the effectiveness of the proposed method on the prediction of the axial and hoop stiffness of RTPs,which also proves the existence of stiffness *** the axial stiffness is proportional to the radii,the axial stiffness surface consists of a series of straight lines,which can be used to predict both thin-walled and thick-walled ***,the hoop stiffness is more applicable for thin-walled RTPs because the proposed method ignores the proportional relationship between the homogenized hoop elastic moduli and the reciprocal radii in helical structures.

关键词： reinforced thermoplastic pipes(RTPs) helical fibers axial stiffness hoop stiffness

Construction of the Inference Engine of Blast Furnace Expert System

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 1998年第2期5卷 24-29页

作者： Liu Jinkun wang shuqing State Key Laboratory of CAD & CG Zhejiang University

The expert system for judging blast furnace condition is built to realize automatic judgment of blast furnace conditions and standardization of blast furnace operation. This paper discusses the design and implementati... 详细信息

关键词： blast furnace expert system inference engine

同方期刊数据库

Polymer-encapsulated metal complex catalysts:An emerging and efficient platform for electrochemical CO_(2) reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第5期172卷 33-50页

作者： Yingshuo Liu Shuaishuai Lyu Fuli Wen Weixuan Nie shuqing wang Sinopec Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China School of Engineering Westlake UniversityHangzhou 310024China

Over the past decade,electrocatalytic reduction of CO_(2)has gained substantial ***,hardly any of the previous reviews have focused on the systematic discussion of polymer-molecular catalyst composites as an emerging system for the electrochemical transformation of CO_(2)to value-added *** this review,we first give a brief overview of the general features of solid-state and molecular catalysts,and then advance the discussion to polymer-catalyst composite systems,with particular emphasis on polymer-encapsulated molecular catalysts,where the coordination environment surrounding molecular catalysts can be modified via polymer encapsulation to promote the overall performance of CO_(2)*** elucidation of the possible reaction mechanisms of this emerging electrocat-alytic system along with proposed optimization strategies is also summarized and discussed based on recently published reports,followed by the challenges and prospects of their industrial applications at the end of this *** this review,we hope the audience can gain a comprehensive understanding of the electrocatalytic mechanism of the coordinating polymers and valuable insights into engineering the microenvironment surrounding the metal complexes for potential future research directions.

关键词： Polymer-molecular catalyst composite Polymer encapsulation Coordination environment CO_(2)electrocatalysis Electrocatalytic mechanism

Characteristics of a Quasi-Zero-Stiffness Isolator Using a Double-Curved Beam as a Negative Stiffness Mechanism

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第6期23卷 1409-1422页

作者： ZHENG Zepeng wang shuqing JIANG Bo LI Daoxi College of Engineering Ocean University of ChinaQingdao 266404China Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266404China

In this paper,a new quasi-zero-stiffness(QZS)nonlinear isolation system using a double-curved beam(DCB)as a negative stiffness structure is proposed,and its performance is *** negative stiffness provided by the DCB to the isolator in the equilibrium position reduces the isolator’s overall dynamic *** and dynamic characteristics of the system are *** amplitude-frequency characteristics and force transmissibility equation of the system were derived via the harmonic balance *** effects of damping ratio and excitation force amplitude on amplitude-frequency and force transmissibility curves are examined,and the isolation performance is compared with that of an equivalent linear isolator supporting the same mass with the same static deflection as nonlinear ***,MATLAB numerical simulation software is used to perform dynamic time analysis of the nonlinear isolation *** results indicate that the amplitude-frequency curves of the nonlinear isolation system exhibit bending,accompanied by discontinuous jumps in *** appropriate increase in the damping ratio or reduction in the excitation amplitude benefits the vibration isolation performance of the nonlinear vibration isolation *** with the equivalent linear isolation system,the QZS isolation system exhibits a better low-frequency vibration isolation performance,which provides a theoretical basis for the design of low-frequency nonlinear isolators.

关键词： double-curve beam quasi-zero-stiffness characteristic nonlinear low-frequency vibration isolation

Theoretical Prediction of the Bending Stiffness of Reinforced Thermoplastic Pipes Using a Homogenization Method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2022年第6期21卷 1441-1453页

作者： LIU Wencheng wang shuqing BU Jiarun DING Xindong College of Engineering Ocean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China

The accurate prediction of bending stiffness is important to analyze the buckling and vibration behavior of reinforced thermoplastic pipes(RTPs)in practical ocean *** this study,a theoretical method in which the constitutive relationships between orthotropic and isotropic materials are unified under the global cylindrical coordinate system is proposed to predict the bending stiffness of ***,the homogenization assumption is used to replace the multilayered cross-sections of RTPs with homogenized *** from present studies,the pure bending case of homogenized RTPs is analyzed,considering homogenized RTPs as hollow cylindrical beams instead of using the stress functions proposed by ***,the bending stiffness of RTPs can be determined by solving the homogenized axial elastic moduli and moment of inertia of cross *** with the existing theoretical method,the homogenization method is more practical,universal,and computationally ***,the pure bending case of RTPs was simulated to verify the homogenization method via conducting ABAQUS Explicit quasi-static *** with the numerical and existing theoretical methods,the homogenization method more accurately predicts the bending stiffness and stress *** stress field of RTPs and the effect of winding angles are also discussed.

关键词： reinforced thermoplastic pipes bending stiffness pure bending case homogenization assumption stress analysis

Probabilistic Analysis and Fatigue Damage Assessment of Offshore Mooring System due to Non-Gaussian Bimodal Tension Processes

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2017年第4期16卷 585-601页

作者： CHANG Anteng LI Huajun wang shuqing DU Junfeng College of Engineering Ocean University of ChinaQingdao 266100P.R.China Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100P.R.China

Both wave-frequency(WF) and low-frequency(LF) components of mooring tension are in principle non-Gaussian due to nonlinearities in the dynamic *** paper conducts a comprehensive investigation of applicable probability density functions(PDFs) of mooring tension amplitudes used to assess mooring-line fatigue damage via the spectral ***-term statistical characteristics of mooring-line tension responses are firstly investigated,in which the discrepancy arising from Gaussian approximation is revealed by comparing kurtosis and skewness *** distribution functions based on present analytical spectral methods are selected to express the statistical distribution of the mooring-line tension *** indicate that the Gamma-type distribution and a linear combination of Dirlik and Tovo-Benasciutti formulas are suitable for separate WF and LF mooring tension components.A novel parametric method based on nonlinear transformations and stochastic optimization is then proposed to increase the effectiveness of mooring-line fatigue assessment due to non-Gaussian bimodal tension *** time domain simulation as a benchmark,its accuracy is further validated using a numerical case study of a moored semi-submersible platform.

关键词： fatigue damage non-Gaussian bimodal process rainflow counting cycle distribution offshore mooring system

Modal Strain Energy Based Structural Damage Localization for Offshore Platform using Simulated and Measured Data

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2014年第3期13卷 397-406页

作者： wang shuqing LIU Fushun ZHANG Min College of Engineering Ocean University of China

Modal strain energy based methods for damage detection have received much attention. However, most of published articles use numerical methods and some studies conduct modal tests with simple 1D or 2D structures to verify the damage detection algorithms. Only a few studies utilize modal testing data from 3D frame structures. Few studies conduct performance comparisons between two different modal strain energy based methods. The objective of this paper is to investigate and compare the effectiveness of a traditional modal strain energy method(Stubbs index) and a recently developed modal strain energy decomposition(MSED) method for damage localization, for such a purpose both simulated and measured data from an offshore platform model being used. Particularly, the mode shapes used in the damage localization are identified and synthesized from only two measurements of one damage scenario because of the limited number of sensors. The two methods were first briefly reviewed. Next, using a 3D offshore platform model, the damage detection algorithms were implemented with different levels of damage severities for both single damage and multiple damage cases. Finally, a physical model of an offshore steel platform was constructed for modal testing and for validating the applicability. Results indicate that the MSED method outperforms the Stubbs index method for structural damage detection.

关键词： offshore platform damage localization strain energy mode shapes modal testing

Investigation of the Hydrodynamic Performance of a Novel Semi-Submersible Platform with Multiple Small Columns

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2019年第1期18卷 108-122页

作者： SONG Xiancang wang shuqing LI Huajun LI Tao Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of China

This paper presents a novel semi-submersible(SEMI) platform concept, called the multiple small columns(MSC) SEMI that improves upon the hydrodynamic performance of the conventional SEMI. Unlike the conventional SEMI, the proposed MSC SEMI utilizes multiple small circular columns to support the deck and a large pontoon that increases the structural displacement. The novelty of the MSC SEMI is its reduction of the hydrodynamic load on the structure and suppression of its motion response, particularly in the heave direction. The MSC SEMI has the advantages of increasing the added mass, radiation damping, and natural period of the structure. A comprehensive investigation of the hydrodynamic performance of the novel MSC SEMI is conducted in both the time and frequency domains with a special focus on the resulting hydrodynamic load and motion response. Numerical simulation results demonstrate that the MSC SEMI concept can reduce the hydrodynamic load and motion response and improve the hydrodynamic performance of SEMIs as expected.

关键词： semi-submersible platform multiple small columns hydrodynamic performance coupled dynamic analysis

An Investigation on Low Frequency Fatigue Damage of Mooring Lines Applied in a Semi-Submersible Platform

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2016年第3期15卷 438-446页

作者： DU Junfeng wang shuqing CHANG Anteng LI Huajun College of Engineering Ocean University of China

Assessing the fatigue life of mooring systems is important for deep water structures. In this paper, a comprehensive fatigue analysis is conducted on the mooring lines applied in a semi-submersible platform with special focus on the low frequency(LF) fatigue damage. Several influential factors, including water depth, wave spectral parameters, and riser system, are considered. Numerical simulation of a semi-submersible platform with the mooring/riser system is executed under different conditions, and the fatigue damage of mooring lines is assessed by using the time domain analysis method as a benchmark. The effects of these factors on the mooring line tension and the fatigue damage are investigated and discussed in detail. Research results indicate that the LF fatigue damage only accounts for a very small portion of the total damage, although the LF components dominate the global motion response and the mooring line tension of the semi-submersible platform. However, it is demonstrated that the LF fatigue damage is clearly affected by the influential factors. The increase in water depth and spectral peak periods, and the existence of risers can weaken the contribution of the LF components to the mooring line fatigue damage, while the fatigue damage due to the LF components increases with the increase of significant wave height.

关键词： semi-submersible mooring line fatigue damage low frequency wave frequency

Alterative application of five anticonvulsants according to the half life for the treatment of status epilepticus in children with severe viral encephalitis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2007年第9期2卷 561-564页

作者： Yanzhi Huang Libin Yang shuqing wang Guiting wang Department of Pediatrics First Hospital of Jilin University Changchun 130021 Jilin Province China Changchun Children＇s Hospital Changchun 130061 Jilin Province China Gongzhuling Central Hospital Gongzhufing 136100 Jilin Province China

BACKGROUND： Traditional subhibernation therapy may easily cause complications, such as respiratory depression and hyportension because of application of chlorpromazine hydrochloride and promethazine in a large dosage. OBJECTIVE： To observe therapeutic effect of modified subhibernation therapy （alterative application of five anticonvulsants according to the half life） on status epilepticus in children with severe viral encephalitis （VE）. DESIGN： Contrast observation. SETTING： Department of Pediatrics, the First Hospital of Jilin University. PARTICIPANTS： The participants in present study were 96 patients with severe viral encephalitis including 52 boys and 44 girls who received treatment in the Department of Pediatrics, the First Hospital of Jilin University from February 2000 to March 2006. All children met the diagnostic criteria of Zhufutong Practice Pediatrics （the seventh edition）. Two weeks ago, they ever got upper respiratory infection or enteronitis and so on before the onset, spirit abnormal, behavior disorder, limbs act disorder, vomit, headache, convulsion, nervous system masculine signs such as limbs act disord, autonomic nerve damage manifestation, brain nerve palsy, dysreflexia, meningeal irritation sign, cerebrospinal fluid and electroencephalography （EEG） abnormity. All parents provided the confirmed consent. The patients were randomly divided into control group （n =40） and experimental group （n =56）. METHODS： Patients in the control group received anticonvulsion, ice compress and routine treatment. The convulsion was treated with five drugs： 0.5 mg/kg wintermin and phenergan, respectively, 100 g/L chlorpromazine hydrochloride （0.5 mL/kg）, 5 mg/kg luminal, 0.3 mg/kg ansiolin. When convulsion attacked, those five drugs were given alternatively; however, those were not given if the convulsion did not attack. Children in the experimental group were treated with improved subhibernation therapy based on routine treatment. The dosages of anticonvuls

关键词： improved subhibernation therapy status epilepticus encephalitis, viral