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往复压缩机管道系统气流脉动与海洋平台水上桁架结构声发射检测机理分析.pdf

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了多个实验,利用模拟声发射源开展了T型管结构及焊接结构试验,研究了焊接角度以及焊接结构对声发射波传播特性的影响。关键词往复压缩机,气流脉动,海洋平台,声发射IIABSTRACTGas Pulsation of Reciprocating Compressor Piping System andMechanism of Acoustic Emission in Offshore PlatOverwater Truss Structure lbsearchABSTRACTReciprocating compressor is the most important in the production ofpetrochemical equipment,often used to drive the gas or compress the gas inorder to meet the needs of technological process.The reciprocatingcompressor piston periodic reciprocating movement,result in certain gaspulsation existing in the pipeline,when the gas pulsation meet the saltation ofpipe structure will produce vibration force,that cause the vibration of thepipeline.Vibration will affect the normal production of the enterprise,moreover lead to major accidents such as support fracture or pipe leaks.Thestudy of gas pulsation of reciprocating compressor piping system hasimportant practical value.Jacket plat is the necessary way and tools to theexploitate the Marine resources,due to the complexity of structure,it is verydifficult to monitor the plat condition.Acoustic emission technology ismuch easier and convenient than other nondestructive testing technology,SO itis the inevitable trend to monitor the heakh ofjacket plat.Researching themechanism of acoustic emission in plat overwater truss structure is veryimportant.Part 1 is the gas pulsation of reciprocating compressor piping systemresearch.Analysing the gas pulsation incentive mechanism and the pipelinevibration process,according to the fluid motion equation,the gas pulsation ofpipeline structure in different unit was deduced.Theoretical calculation was applied to analyse the gas pulsation of a petrochemical plantdevice,and puting forward a scheme to inhibit the gas pulsation.It is verifiedthe effectiveness ofthe gas pulsation analysis by the actual effectPart 2 is the mechanism of acoustic emission in offshore platoverwater truss s缸ucture research.Starting from the theory of elastic wave,thecharacteristic and law of acoustic emission transmission in hollow cylinderwas deduced according to the common j acket plat.Using the acousticemission signal acquisition system and the simulated acoustic emission sourceto carry out the T tube s仃ucture and the welding structure test,the angle ofwelding and welding sn佻t1Jr.e is studied in the spread of the acousticemission.KEY WORDSreciprocating compressor,gas pulsation,offshore plat,acoustic emissionII目录目 录第一篇往复压缩机管道系统气流脉动。1第一章绪论。11.1研究背景及意义..11.2国内外现状及发展趋势..11.3本课题来源及主要研究内容l第二章基于气流脉动的管道振动机理研究12.1气流脉动激励机制..12.2管道系统固有频率计算..12.3气柱固有频率计算一12.4气流脉动计算一12.4.1简单管道系统计算12.4.2管道系统的始端处理12.4.3各单元的传递方程12.5气流脉动许用标准..12.6本章小结.1第三章基于气流脉动抑制的管道减振工程研究。13.1机组基本情况..13.2气流脉动分析..13.2.1真空泵排气至缓冲罐管段分析13.2.2一级压缩机进气管段分析l3.2.3一级排气至二级进气管段分析13.2.4二级排气至三级进气管段分析l3.2.5三级排气管段分析.13.3整改方法和整改效果。l3.3.1真空泵排气至缓冲罐管段改造效果13.3.2一级压缩机进气管段改造效果l北京化工大学硕士学位论文3.3.3一级排气至二级吸气管段改造效果13.3.4二级排气至三级吸气管段改造效果小.13.3.5三级排气管段改造效果l3.3.6整改效果..13.4本章小结.1第四章总结与展望14.1全文总结14.2展望..1第二篇海洋平台水上桁架结构声发射检测机理研究1第一章绪论11.1研究背景及意义..11.2国内外研究现状..11.3本课题来源及主要研究内容l第二章声发射波的传播机理研究.12.1无界固体介质中声发射波的传播12.2实心圆柱体中声发射波的传播l2.2.1纵向模式一12.2.2扭转模态..12.2.3弯曲模态一12.3空心圆柱体中声发射波的传播l2.3.1周向模态..12.3.2纵向模态..12.4本章小结..1第三章导管架平台之T型管结构声发射传播特性研究13.1声发射系统.13.2 T型管结构声发射传播特性1II目录3.2.1实验方案..13.2.2实验结果..13.3本章小结.1第四章导管架平台焊接结构声发射传播特性研究.14.1焊接角度对声发射传播的影响l4.1.1实验方案..14.1.2实验结果..14.2导管架平台焊接结构声发射波传播特性14.2.1实验方案..14.2.2实验结果..14.3本章小结.1第五章总结与展望.15.1全文总结.15.2展望..1参考文献.1i12l[谢........................................................................................1研究成果及发表的学术论文1作者及导师简介1III北京化工大学硕士学位论文IVCoNTENTSContentsPart 1 The gas pulsation of reciprocating compressor piping system...1Chapter 1 Introduction..................................11.1 Research Backgroud and Significance......................................................。....................11.2 Domestic and intemational situation.............................................................................11.3 Source and main research contents ofthis issue.............................................................1Chapter 2 Research of pipeline vibration based on gas pulsation...........12.1 Gas pulsation generation and mechanism......................................................................12.2 Calculation ofpiping system natural frequency.............................................................12.3 Calculation ofcolumn system natural frequency...........................................................12.4 Calculation ofgas pulsation..........................................................................................12.4.1 Claculation ofsimple piping system...........................................................................12.4.2 Deal with start ofpiping system.................................................................................12.4.3 Transfer equation ofeach unit....................................................................................12.5 Allowable standard ofgas pulsation..............................................................................12.6 Summary ofchapter......................................................................................................1Chapter 3 Research of pipeline vibration engineer based on gas pulsation 1;.1 Basic situation ofunit.................................................................................13.2 Analysis ofgas pulsation...............................................................................................13.2.1 Pulsation analysis ofpump to buffer tank.13.2.2 Pulsation analysis offirst stage suction.13.2.3 Pulsation analysis of fn st discharge to second suction13.2.4 Pulsation analysis ofsecond dischage to third suctionl3.2.5 Pulsation analysis ofthird discharge1;.3 Transation scheme and effects.......................................................13.3.1 Transation effects ofpump to buffer tank13.3.2 Transation effects offirst stage suction1l北京化工大学硕士学位论文3.3.3 Transation effects offirst discharge to second suction..13.3.4 Transation effects ofsecond dischage to third suction..13.3.5 Transation effects ofthird discharge.1;.;.6 Transation effects..13.4 Summary ofchapter1Chapter 4 Conclusion and prospect........14.1 Conelusion.....14.2 Prospect.........1Part 2 Research mechanism of acoustic emission in offshore platoverwater truss structure........................................................................1Chapter 1 Introduction...................11.1 Research Backgroud and Significance...............................................................11.2 Domestic and international situation.................................................................11.3 Source and main research contents ofthis issue.............................................................1Chapter 2 Research mechanism of acoustic emission transmission...12.1 Acoustic emission transmission in solid media..12.2 Acoustic emission transmission in solid cylinder...........................................................12.2.1 Longitudinal mode................................................................................12.2.2 Torsinal mode...12.2.3 Bending mode...12.3 Acoustic emission transmission in hollow cylinder........................................................12.3.1 Circumferential mode12.3.2 Longitudinal mode............................................................................................12.4 Summary ofchapter.......................................................................................1Chapter 3 Research characteristic of acoustic emission transmission in Ttude structure......................1II3.1 Acoustic emission system13.2 Acoustic emission propagation characteristic in T tude structurel3.2.1 ExperimentaI scheme·l3.2.2 E冲eriIllentaI resultl3.3 s1】mmary。fchapter1Chapter 4 Research characteristic of ac。ustic emissi。ntralnsmissi。n inwelding structure of jacket plat14.1 Weldmg angle effect on the spread ofacoustic emission14.1.1 Experimental scheme‘4.1.2 Experimental result14.2 WeldiIlg structure effect on the spread of acoustic emission14.2.1 Experimental scheme‘’14.2.2 Experimental result。‘4.3 Summary ofchapter一chapter 5 Conciusion and prospect15.1 Conclusionl5.2 ProspectlRefen玳e··1Acknowledgement¨1Research resuIts and publication dissertation·1Brief introduction of author and tutor。.。。。·”””·“·¨¨lUI
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