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#author("2026-07-14T11:52:39+09:00","default:exp","exp") #author("2026-07-14T19:07:24+09:00","default:exp","exp") [[授業]] [[latest lecture>#x17b6ab1]] *第1回(2026.4.14) [#dafbd3bb] - シラバス：&ref(シラバス詳細.pdf); - 本科目の目的：以下の研究について、文献を調査・議論することで現在の動向を理解する。 -- (i)音響境界条件の能動制御（電力消費を許す）の研究（特にロバスト制御を用いて系統的な制御系設計を行っているもの） --- [[Bothien et al. 2008:Active control of the acoustic boundary conditions of combustion test rigs>https://www.sciencedirect.com/science/article/pii/S0022460X08004203/pdfft?md5=431fa82793e5e9040a6d6954c2467499&pid=1-s2.0-S0022460X08004203-main.pdf]] //--- [[Li et al. 2004:Dual-driver standing wave tube: acoustic impedance matching with robust repetitive control>https://ieeexplore.ieee.org/document/1024514]] -- (ii)発振を維持・促進させる受動制御（電力消費を許さない）の研究 --- [[Desjouy et al. 2010:Active control of thermoacoustic amplification in an annular engine>https://pubs.aip.org/aip/jap/article-pdf/doi/10.1063/1.3512962/15067271/114904_1_online.pdf]] - 第1回の目的：2センサ法（2箇所の圧力計測で流速が分かる）を理解する -- 具体的には、[[篠田他2018>https://www.jstage.jst.go.jp/article/jasj/74/6/74_313/_pdf/-char/ja]] の (3)式、または [[Kobayashi et al.2019>https://www.sciencedirect.com/science/article/pii/S0022460X19303074/pdfft?md5=311b57e78fc95f1f168f57fb5e956234&pid=1-s2.0-S0022460X19303074-main.pdf]] の (23)式を理解する -- 参考資料：&ref(3年学生実験2018/B2.pdf); の 3.1節、3.2節、付録A, B --- 複素振幅による調和振動の表現 ... 3.1節、式(2) --- 圧力と粒子（体積）速度に関する基本の式 ... 付録A、式(27)と(31) #ref(2026.04.14-1.jpg,left,noimg,板書1) #ref(2026.04.14-2.jpg,left,noimg,板書2) #ref(2026.04.14-3.jpg,left,noimg,板書3) *第2回(2026.4.21) [#r33786bd] - Objective of this course: To understand current trends in the following research topics by investigating and discussing the literature. -- (i)Research on active control of acoustic boundary conditions (allowing power consumption) (particularly those involving systematic control system design using robust control). --- [[Bothien et al. 2008:Active control of the acoustic boundary conditions of combustion test rigs>https://www.sciencedirect.com/science/article/pii/S0022460X08004203/pdfft?md5=431fa82793e5e9040a6d6954c2467499&pid=1-s2.0-S0022460X08004203-main.pdf]] //--- [[Li et al. 2004:Dual-driver standing wave tube: acoustic impedance matching with robust repetitive control>https://ieeexplore.ieee.org/document/1024514]] --- ... --- ... -- (ii)Research on passive control (without allowing power consumption) to maintain and promote oscillation --- [[Desjouy et al. 2010:Active control of thermoacoustic amplification in an annular engine>https://pubs.aip.org/aip/jap/article-pdf/doi/10.1063/1.3512962/15067271/114904_1_online.pdf]] --- ... --- ... - Objective of [Bothien et al. 2008] -- thermoacoustic instability -- simulated tube section (to simulate acoustic boundary conditions) -- two microphone method ... Eq.(16) - two microphone method (cont.) -- frequency response of time delay -- steady-state response -- traveling-wave sound field when ~B_2 = 0 -- relation between the wave equation and ~p(x) #ref(2026.04.21-1.jpg,left,noimg,板書1) #ref(2026.04.21-2.jpg,left,noimg,板書2) *第3回(2026.4.28) [#tc47f3cb] - controller design? of [Bothien et al. 2008] -- first calculate the ideal frequency response, then approximate it to obtain the resultant state-space representation -- no consideration of closed-loop stability (manual tuning is necessary e.g. control gain Kg in [Bothien et al 2010]) - review of classical and modern control theory in lec.#1, #2 of [[授業/制御工学特論2025]] -- transfer functions / state-space representation -- system stability / poles / eigenvalues -- Bode plot / Nyquist plot ... #ref(2026.04.28-1.jpg,left,noimg,板書1) #ref(2026.04.28-2.jpg,left,noimg,板書2) #ref(2026.04.28-3.jpg,left,noimg,板書3) #ref(2026.04.28-4.jpg,left,noimg,板書4) *第4回(2026.5.19) [#j94319fb] - literature survey for research on active control of acoustic boundary conditions : find papers that meet the following conditions: -- (i) active control system design for simulated tube is considered -- (ii) robust stability of closed-loop system against plant variations is considered - example (insufficient) -- [[Li et al. 2004:Dual-driver standing wave tube: acoustic impedance matching with robust repetitive control>https://ieeexplore.ieee.org/document/1024514]] --- acoustic impedance matching = acoustic boundary control --- robust (repetitive) control = robust closed-loop stability is considered --- BUT tonal excitation ... oscillation frequency is previously known - review of classical and modern control theory -- 2nd order system, poles, impulse response, ... &ref(ex0519_1.m); &ref(mod0519_1.mdl); #ref(2026.05.19-1.jpg,left,noimg,板書1) #ref(2026.05.19-2.jpg,left,noimg,板書2) *第5回(2026.5.26) [#la2691dd] - literature survey for research on active control of acoustic boundary conditions (cont.) -- (i) active control system design for simulated tube is considered --- simulated tube is active acoustical system that simulates the behavior of a passive acoustical tube -- (ii) robust stability of closed-loop system against plant variations is considered --- diffinition of H infinity norm ? #ref(2026.05.26-1.jpg,left,noimg,板書1) #ref(2026.05.26-2.jpg,left,noimg,板書2) *第6回(2026.6.2) [#p44a65fb] - literature survey for research on active control of acoustic boundary conditions (cont.) -- (i) active control system design for simulated tube is considered --- simulated tube is active acoustical system that simulates the behavior of a passive acoustical tube -- (ii) robust stability of closed-loop system against plant variations is considered --- diffinition of H infinity norm ? ... this was not requirement for selecting papers - discussion on selected papers - example (insufficient) -- [[Cheng et al. 2018:Acoustic impedance tuning with active disturbance rejection control>https://journals.sagepub.com/doi/pdf/10.1177/1461348418781869]] --- (i) yes: simulated tube is considered --- (ii) no: parameter tuning is necessary in ADRC #ref(2026.06.02-1.jpg,left,noimg,板書1) *第7回(2026.6.9) [#kb56d1d9] - literature survey for research on active control of acoustic boundary conditions (cont.) -- (i) active control system design for simulated tube is considered --- simulated tube is active acoustical system that simulates the behavior of a passive acoustical tube -- (ii) robust stability of closed-loop system against plant variations is considered - about `simulated tube' for the 1st paper [[Bothien et al. 2008:Active control of the acoustic boundary conditions of combustion test rigs>https://www.sciencedirect.com/science/article/pii/S0022460X08004203/pdfft?md5=431fa82793e5e9040a6d6954c2467499&pid=1-s2.0-S0022460X08004203-main.pdf]] -- `simulated tube' is only named by Kobayashi (not the author) to represent the objective of the paper as in the sentences e.g. `the test rig length can be virtually extended' in abstract, and `the aim of the control scheme to be presented is to mimic certain prescribed impedances' in the explanation of Fig.1 on p.680. -- final goal is to develop full-scale engine with new burner generations such as a swirl-stabilized burner (in 2008), -- but the goal of the paper is, in the design stage, to provide an active control mean to change acoustic boundary condition without hardware changes. - discussion on selected papers -- [[Annaswamy et al. 2000:Thermoacoustic instability: model-based optimal control designs and experimental validation>https://ieeexplore.ieee.org/abstract/document/880593]] --- active noise control to suppress pressure fluctuation by using single microphone and a loudspeaker ... simulated tube is not considered --- additive uncertainties ΔP, H infinity control, mixed sensitivity problem ... robust control is considered --- extends the results of [1] -- [[Zhao et al. 2018:A review of active control approaches in stabilizing combustion systems in aerospace industry>https://www.sciencedirect.com/science/article/pii/S0376042117300878]] --- [152] is the 1st paper [[Bothien et al. 2008]]: `This can be overcome by applying an array of sensors, ...' --- no mention for the `simulated tube' is given ... further survey is difficult #ref(2026.06.09-1.jpg,left,noimg,板書1) *第8回(2026.6.18) [#da3f3221] - literature survey for research on active control of acoustic boundary conditions (cont.) -- cite [[Bothien et al. 2008:Active control of the acoustic boundary conditions of combustion test rigs>https://www.sciencedirect.com/science/article/pii/S0022460X08004203/pdfft?md5=431fa82793e5e9040a6d6954c2467499&pid=1-s2.0-S0022460X08004203-main.pdf]] - [[Haeringer et al. 2021: A Strategy to Tune Acoustic Terminations of Single-Can Test-Rigs to Mimic Thermoacoustic Behavior of a Full Engine>https://asmedigitalcollection.asme.org/gasturbinespower/article-abstract/143/7/071029/1087611/A-Strategy-to-Tune-Acoustic-Terminations-of-Single?redirectedFrom=fulltext]] -- `mimic' in title -- Analysis of a part of full engine, 16 single-cans in an aircraft's full engine. -- passive duct tuning for acoustic impedance matching: straight duct and Helmholtz resonator ... active control is not considered - [[Guo et al.2024: Dynamic behavior modeling and energy conversion characteristic analysis of a thermoacoustic-piezoelectric generator with the consideration of thermal and viscous losses>https://www.sciencedirect.com/science/article/pii/S0022460X24001019]] -- thermoacoustic-piezoelectric generator ... more related to second half class (energy utilization) - [[Chen et al.2020: Impact of Sensor Placement on Mode Observability and LQG Control of a Thermoacoustic System>https://www.sciencedirect.com/science/article/pii/S2405896320331712]] -- mainly focuses on sensor placement - [[Semlitsch 2023: Boundary conditions to represent the wave impedance characteristics of axial compressors>https://www.sciencedirect.com/science/article/pii/S0003682X23000348]] -- `... boundary conditions can alter the thermoacoustic characteristics of combustors' - [[Blonde et al.2025: Tunable passive control of thermoacoustic instabilities based on a variable geometry combustor outlet nozzle>https://www.sciencedirect.com/science/article/pii/S1270963825000069]] -- passive control because loudspeaker is difficult to use in combustion environment - [[Kojourimanesh et al.2021: Thermo-acoustic flame instability criteria based on upstream reflection coefficients>https://www.sciencedirect.com/science/article/pii/S0010218020305228]] -- active control - [[Ganji et al.2024: Discussing the limitations of unconditional stability indicators in evaluating thermoacoustic quality of burners with flames>https://journals.sagepub.com/doi/full/10.1177/17568277241265433]] -- stability analysis related to control engineering (Nyquist stability criterion, scattering matrices...) #ref(2026.06.18-1.jpg,left,noimg,板書1) #ref(2026.06.18-2.jpg,left,noimg,板書2) *第9回(2026.6.23) [#re3a440e] - e-mailed paper [[Morgans and Yang 2025: Thermoacoustic Instability in Combustors>https://www.annualreviews.org/content/journals/10.1146/annurev-fluid-121021-032828]] -- [Bothien et al. 2008] is not cited -- no active control ... difficult in real situation -- CAN type combustors - literature survey for research on active control of acoustic boundary conditions (cont.) ... the last two papers in the previous lecture -- cite [[Bothien et al. 2008:Active control of the acoustic boundary conditions of combustion test rigs>https://www.sciencedirect.com/science/article/pii/S0022460X08004203/pdfft?md5=431fa82793e5e9040a6d6954c2467499&pid=1-s2.0-S0022460X08004203-main.pdf]] - [[Kojourimanesh et al.2021: Thermo-acoustic flame instability criteria based on upstream reflection coefficients>https://www.sciencedirect.com/science/article/pii/S0010218020305228]] -- active control -- derivation of Eq.(3) (homework) - [[Ganji et al.2024: Discussing the limitations of unconditional stability indicators in evaluating thermoacoustic quality of burners with flames>https://journals.sagepub.com/doi/full/10.1177/17568277241265433]] -- stability analysis related to control engineering (Nyquist stability criterion, scattering matrices...) #ref(2026.06.23-1.jpg,left,noimg,板書1) #ref(2026.06.23-2.jpg,left,noimg,板書2) #ref(2026.06.23-3.jpg,left,noimg,板書3) *第10回(2026.6.30) [#a26633a6] - review of control theory related to the last two papers in the previous lecture (cont.) -- [[Kojourimanesh et al.2021: Thermo-acoustic flame instability criteria based on upstream reflection coefficients>https://www.sciencedirect.com/science/article/pii/S0010218020305228]] -- [[Ganji et al.2024: Discussing the limitations of unconditional stability indicators in evaluating thermoacoustic quality of burners with flames>https://journals.sagepub.com/doi/full/10.1177/17568277241265433]] --- closed-loop stability and (i)eigenvalues of A-matrix, (ii) poles of transfer function (characteristic equation), and (iii) Nyquist stability criterion --- &ref(ex0623_1.m); &ref(mod0623_1.mdl); - Objective of this course: To understand current trends in the following research topics by investigating and discussing the literature. -- (i)Research on active control of acoustic boundary conditions (allowing power consumption) (particularly those involving systematic control system design using robust control). --- [[Bothien et al. 2008:Active control of the acoustic boundary conditions of combustion test rigs>https://www.sciencedirect.com/science/article/pii/S0022460X08004203/pdfft?md5=431fa82793e5e9040a6d6954c2467499&pid=1-s2.0-S0022460X08004203-main.pdf]] ... finished -- (ii)Research on passive control (without allowing power consumption) to maintain and promote oscillation --- [[Desjouy et al. 2010:Active control of thermoacoustic amplification in an annular engine>https://pubs.aip.org/aip/jap/article-pdf/doi/10.1063/1.3512962/15067271/114904_1_online.pdf]] ... active control but no power consumption = `passive control' #ref(2026.06.30-1.jpg,left,noimg,板書1) #ref(2026.06.30-2.jpg,left,noimg,板書2) #ref(2026.06.30-3.jpg,left,noimg,板書3) *第11回(2026.7.7) [#x17b6ab1] - literature survey for research on active/passive control (without power consumption) to maintain and/or promote oscillation : find papers that meet the following conditions: -- (i) active/passive control is used to maintain and/or promote oscillation -- (ii) thermoacoustic system (engine, cooler, generator, ... ) that utilizes (waste) heat energy - example -- [[Desjouy et al. 2010:Active control of thermoacoustic amplification in an annular engine>https://pubs.aip.org/aip/jap/article-pdf/doi/10.1063/1.3512962/15067271/114904_1_online.pdf]] --- thermoacoustic engine ... but no system output (artificial system) --- active control with power consumption of loudspeakers ... `passive control' ? #ref(2026.07.07-1.jpg,left,noimg,板書1) *第12回(2026.7.14) [#ab3f9686] - literature survey for research on active/passive control (without power consumption) to maintain and/or promote oscillation : find papers that meet the following conditions: -- (i) active/passive control is used to maintain and/or promote oscillation -- (ii) thermoacoustic system (engine, cooler, generator, ... ) that utilizes (waste) heat energy - selected papers -- [[Chen et al. 2020: Large eddy simulation of thermally induced oscillatory flow in a thermoacoustic engine>https://www.sciencedirect.com/science/article/pii/S0306261920309703]] --- (i)NO: no control --- (ii)YES: thermoacoustic engine -- [[Li and Zhu 2022: Self-Powered Active Vibration Control: Concept, Modeling, and Testing>https://www.sciencedirect.com/science/article/pii/S2095809921002654]] --- (i)NO: active vibration control ... suppression (not maintain/promotion) --- (ii)NO: no thermoacoustic system is considered -- [[Chen et al. 2019: Modelling and analysis of a thermoacoustic-piezoelectric energy harvester>https://www.sciencedirect.com/science/article/pii/S135943111834420X]] --- (i)?: no control mechanism is considered ? (with and without control case?) --- (ii)YES: thermoacoustic-piezoelectric energy harvester is considered -- [[Yu et al. 2012: Travelling-wave thermoacoustic electricity generator using an ultra-compliant alternator for utilization of low-grade thermal energy>https://www.sciencedirect.com/science/article/pii/S0306261912003455]] --- (i)NO: no control mechanism is considered ? (with and without control case?) --- (ii)YES: thermoacoustic electricity generator is considered -- [[Zhang et al. 2025: Thermoacoustically driven pulse tube cooler for cascade recovery of waste heat>https://www.sciencedirect.com/science/article/pii/S036054422502198X]] --- (i)NO: no control mechanism is considered ? (with and without control case?) --- (ii)YES: thermoacoustic engine is used to drive pulse tube cooler #ref(2026.07.14-1.jpg,left,noimg,板書1) //■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ &color(black,red){&size(20){!!!!!!!!!!!!!!!!!!!!!!!!!!!!!以下は過去の情報です!!!!!!!!!!!!!!!!!!!!!!!!!!};}; *第13回(2026.7.21) [#r969b9dd] - literature survey for research on active/passive control (without power consumption) to maintain and/or promote oscillation (cont.) : find papers that meet the following conditions: -- (i) active/passive control (electrically) is used to maintain and/or promote oscillation -- (ii) thermoacoustic system (engine, cooler, generator, ... ) that utilizes (waste) heat energy *第14回(2026.7.28) [#ab4d82c9] - literature survey for research on active/passive control (without power consumption) to maintain and/or promote oscillation : find papers that meet the following conditions: -- (i) active/passive control is used to maintain and/or promote oscillation -- (ii) thermoacoustic system (engine, cooler, generator, ... ) that utilizes (waste) heat energy
