ᢏ⾡◊✲ᡤ 㡢㡪࣭㟁☢⎔ቃࢢ࣮ࣝࣉ U.D.C 534.843.5
ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢ㡢ሙண ⢭ᗘ㛵ࡍࡿ୍⪃ᐹ
㸫พ᭤㠃ࢆ᭷ࡍࡿ✵㛫࠾ࡅࡿ㡢ሙண 㸫
୰ᮧ ᜨ
㸨ୖ ㅍ
㸨 せ ⣙㸸 ᡪᙧࡢᑠつᶍㅮᇽࡢィ⏬࠾࠸࡚㸪ᗄఱ㡢㡪Ꮫᇶ࡙ࡃࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡗ࡚ᐊෆ㡢㡪᳨ウࢆ⾜࠸㸪ᐇ ࡼࡾண ไᗘ ࢆ᳨ドࡋࡓࠋ᳨ウ࡛ࡣพ᭤㠃㉳ᅉࡍࡿ㡢㡪㞀ᐖࡢᅇ㑊㡢ኌఏ㏦ᛶ⬟ࡢ☜ಖ㔜Ⅼࢆ⨨࠸ࡓࠋ❹ᕤᚋࡢᛶ⬟ࡢㄪᰝࡼࡾ㸪ᮏ ㅮᇽࡣㅮ₇࣭ㅮ⩏➼ࡢ⏝࠾࠸࡚༑ศ࡞ᛶ⬟ࢆ᭷ࡍࡿࡇࡀ☜ㄆࡉࢀࡓࠋ ᗄఱ㡢㡪Ꮫᇶ࡙ࡃࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿண ⢭ᗘࡢ᳨ド࡛ࡣ㸪ࣜࣇࣞࢡࢺࢢ࣒ࣛࡼࡿ࢚ࢥ࣮㸪ཬࡧ㸪≀⌮ᣦᶆ D ್ࡘ ࠸࡚☜ㄆࡋࡓࠋ2000Hz ᖏᇦ࠾ࡅࡿࣜࣇࣞࢡࢺࢢ࣒ࣛࡢໟ⤡⥺ࡽᚓࡽࢀࡓᖹἼᙧࢆẚ㍑ࡋࡓ⤖ᯝ㸪ึᮇࡢᑕ㡢ࡢ฿ ᮶㛫㢮ఝᛶࡀぢࡽࢀࡓࠋࡲࡓ㸪D ್ࢆẚ㍑ࡋࡓ⤖ᯝ࡛ࡣ㸪250Hz ᖏᇦ௨ୖ࡛ࡣᴫࡡ㡢ሙࡢ≉ᚩࢆᤊ࠼ࡽࢀ࡚࠸ࡿࡇࡀ☜ㄆ ࡉࢀࡓࠋࡋࡋ㸪ᐇ ண ࡢ D ್ࡣᕪࡀ࠶ࡾ㸪≉ᑕ㡢ࡀ㞟୰ࡋࡸࡍ࠸ᐊࡢ୰ᚰ⥺ୖ⨨ࡍࡿᗙᖍࡣᛶ⬟ࡀᐇ㝿ࡼࡾࡶ 㧗ࡃண ࡉࢀࡿഴྥࡀぢࡽࢀࡓࠋ 㺕㺎㺺㺎㺢㺼㸸 ᐊෆ㡢㡪᳨ウ㸪ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥ㸪พ᭤㠃㸪ṧ㡪㛫㸪㡢ኌఏ㏦ᛶ⬟㸪D ್ ┠ ḟ㸸 ࡣࡌࡵ ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢண ⢭ᗘ ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿᐊෆ㡢㡪᳨ウ ࡲࡵ ❹ᕤᚋࡢᐊෆ㡢㡪ᛶ⬟ 1. ࡣࡌࡵ พ᭤㠃࡛ᙧᡂࡉࢀࡓᐊ࡛ࡣ㡢ࡢᣑᩓࡀᝏࡃ㸪ᑕ㡢 ࡢ㞟୰ࡸࡑࢀక࠺ࢹࢵࢻࢫ࣏ࢵࢺࡀ⏕ࡌ㸪࢚ࢥ࣮ࡸ ࡉࡉࡸࡁࡢᅇᗯ➼ࡢ㡢㡪㞀ᐖࡀⓎ⏕ࡋࡸࡍ࠸ࡇࡀ▱ ࡽࢀ࡚࠸ࡿࠋ㡢㡪㞀ᐖࡀணぢࡉࢀࡿᐊ࠾࠸࡚㸪Ⰻዲ ࡞㡢ኌఏ㏦ᛶ⬟ࢆ☜ಖࡍࡿࡓࡵࡣ㸪ィ⏬ᐊෆ㡢 㡪≉ᛶࢆண ࡋࡓୖ࡛༑ศ࡞᳨ウࢆ⾜࠸㸪㐺ᡤ྾㡢㸪 ᣑᩓฎ⌮ࢆࡍ➼ࡢᑐ⟇ࡀᚲせ࡞ࡿࠋ ᐊෆ㡢㡪≉ᛶࢆண ࡍࡿࡓࡵࡢ㡢ሙࡢゎᯒᡭἲࡣ㸪 㡢ࡢἼືᛶࢆ⪃៖ࡋ࡚ゎࡃἼື㡢㡪ゎᯒ㸪㡢ࡢἼື ᛶࢆ↓どࡋ࡚࢚ࢿࣝࢠ࣮ࡢఏᦙࢆᗄఱᏛⓗゎࡃᗄఱ 㡢㡪ゎᯒࡀ࠶ࡿࠋᗄఱ㡢㡪ゎᯒࡣ㸪Ἴືᛶࢆ⪃៖ࡋ࡚ ࠸࡞࠸ࡇࡽ㸪ቨ㠃ࡢพฝྠ⛬ᗘࡑࢀ௨ୖࡢἼ 㛗ࢆᣢࡘప㡢ᇦ࠾࠸࡚ࡣㄗᕪࡀ⏕ࡌ㸪ቨ㠃ᑕࢆ⧞ ࡾ㏉ࡍ⌧ᐇࡢ㡢ሙࡢᛶ㉁ࢆᤊ࠼ࡿࡢࡀ㞴ࡋ࠸ࠋࡋ ࡋ㸪ィ⟬㛫ࡢ▷⦰ࡸᑕ㡢ࡢఏᦙ⤒㊰ࡀᐜ᫆㏣ ㊧࡛ࡁࡿࡇࡽ㸪タィᐇົࢆ⾜࠺㝿ࡢ⌧ᐇⓗ࡞ᡭἲ ࡋ࡚⏝ࡉࢀࡿࡇࡀከ࠸ࠋࡲࡓ㸪ᚑ᮶ࡢᗄఱ㡢㡪 ࢩ࣑࣮ࣗࣞࢩ࡛ࣙࣥࡣ㸪ቨ㠃ࡢ㡢㡪≉ᛶࡋ࡚྾㡢⋡ ࡢࡳࢆタィࡢᅉᏊࡋ࡚࠸ࡓࡀ㸪㏆ᖺ࡛ࡣ㙾㠃ᑕ ᑕࢆ༊ูࡋ࡚㸪ᚋ⪅ࡢ࢚ࢿࣝࢠ࣮ࡢྜࢆ ᑕ⋡ᐃ⩏ࡋ㸪ࡑࡢᩘ್ࢆᫎࡉࡏࡿࡇࡼࡾ㸪⌧ ᐇ㏆࠸㡢ࡢఏᦙ≧ἣࡀゎᯒྍ⬟࡞ࡗࡓ 1)ࠋࡓࡔࡋ㸪 ᐇ㡢ሙ࠾ࡅࡿ ᐃ⤖ᯝண ⤖ᯝࢆẚ㍑ࡍࡿ࡞㸪 ண ⢭ᗘࢆ☜ㄆࡋࡓࡣᑡ࡞࠸ࠋ ࡑࡇ࡛ᮏ✏࡛ࡣ㸪ᡪᙧࡢᑠつᶍㅮᇽࡢィ⏬࠾࠸࡚㸪 ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࢆ⏝࠸ࡓࣜࣇࣞࢡࢺࢢ࣒ࣛ㸪 ཬࡧ㸪㡢㡪ᣦᶆ D ್ࢆồࡵ㸪ᐊෆ㡢㡪᳨ウࢆ⾜ࡗࡓ ࢆሗ࿌ࡍࡿࠋࡲࡓ㸪ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡼ ࡿพ᭤㠃ࢆ᭷ࡍࡿ✵㛫ࡢ㡢ሙࡢண ⢭ᗘࢆ☜ㄆࡍࡿࡇ ࢆ┠ⓗ㸪ᮏ࠾ࡅࡿ❹ᕤᚋࡢᐇ ⤖ᯝண ⤖ᯝࢆẚ㍑ࡋ⪃ᐹࡍࡿࠋ 2. ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿᐊෆ㡢㡪᳨ウ 2.1 ᑐ㇟ᐊࡢᴫせṧ㡪㛫┠ᶆ್ ᳨ウࡢᑐ㇟࡞ࡗࡓᐊࡢᴫせࢆᅗ 1㸪⾲ 1 ♧ࡍࠋᑐ ㇟ᐊࡣᡪᙧࢆࡋࡓᑠつᶍㅮᇽ࡛㸪ᐜேᩘࡣ 245 ே㸪 ᐜ✚ࡣ⣙ 1400m3㸪㠃✚ࡣ⣙ 360m2࡛࠶ࡿࠋ࡞⏝㏵ࡣ ㅮ₇ࡸㅮ⩏࡛࠶ࡿࡓࡵ㸪㡢ኌࡼࡿሗఏ㐩ࡀ✵㛫ࡢ 㔜せ࡞ᛶ⬟ࡢ୍ࡘ⨨࡙ࡅࡽࢀࡓࠋ㡢ኌఏ㏦ᛶ⬟ࡣ㸪 ึᮇ㡢ࡢ࢚ࢿࣝࢠ࣮ῶ⾶ᛶ≧ࡸึᮇ࠾ࡼࡧᚋᮇᑕ㡢 ࡢ࢚ࢿࣝࢠ࣮ࣂࣛࣥࢫ㛵ಀࡍࡿ࠸࠺Ⅼࡽ㸪ᐊࡢ ṧ㡪㛫ࡣᮏㅮᇽࡢ㡢㡪ᛶ⬟ᙳ㡪ࢆཬࡰࡍ㔜せ࡞せ ⣲⪃࠼ࡽࢀࡿࠋ᭱㐺࡞ṧ㡪㛫ࡘ࠸࡚ࡣ㸪ࡇࢀࡲ ࡛ከࡃࡢ◊✲⪅ࡼࡗ࡚⤒㦂ⓗࡲࡓࡣ⌮ㄽⓗᐊᐜ✚ ࡢ㛵ᩘࡋ࡚ᥦࡉࢀ࡚࠾ࡾ㸪ࡇࢀࢆ㞟⣙ࡍࡿᅗ 24) ࡢࡼ࠺࡞ࡿࠋᅗ 2 ♧ࡍㅮᇽࡢ┤⥺ࢆཧ↷ࡍࡿ㸪 ᐜ✚ 1400m3ࡢᑐ㇟ᐊ࡛ࡣ 0.8 ⛊ࡀ᭱㐺ṧ㡪㛫࡞ࡿࠋ ୍᪉㸪ᮏㅮᇽࡣพ᭤㠃ࢆ᭷ࡍࡿ✵㛫࡛࠶ࡿࡓࡵ㸪ሙ ᡤࡼࡗ࡚㡢㡪≉ᛶࡀࡁࡃኚࡍࡿࡇࡀணࡉࢀ ࡿࠋ≉㸪↔Ⅼ࡞ࡢሙᡤ࡛ࡣ㸪᭤㠃㉳ᅉࡍࡿᑕ 㡢ࡀ㛫㍈ୖ࠾࠸࡚ࡶ㞟୰ࡋ㸪ࡇࢀࡀ┤᥋㡢ࡽ㐜 ࢀ࡚฿᮶ࡋࡓሙྜࡣ࢚ࢥ࣮ࡋ᳨࡚▱ࡉࢀࡿྍ⬟ᛶ ࡀ࠶ࡿࠋࡓࡔࡋ㸪ṧ㡪㛫ࡀ㛗࠸ṧ㡪㡢ࡼࡾ ᑕ㡢ࡀ࣐ࢫ࢟ࣥࢢࡉࢀ㸪࢚ࢥ࣮క࠺ጉᐖឤࡀኚࡍ ࡿࡇࡀ▱ࡽࢀ࡚࠾ࡾ㸪ࡑࡢᶵᵓࡘ࠸᳨࡚ウࡀ࡞ࡉ 73 * 技術研究所 音響・電磁環境グループ U.D.C 534.843.5幾何音響シミュレーションの音場予測精度に関する一考察
−凹曲面を有する空間における音場予測−
中村 恵
＊井上 諭
＊ࢀࡓࡶ࠶ࡿ 5,6)ࠋ௨ୖࡼࡾ㸪ᮏㅮᇽࡢሙྜࡣ᭱㐺ṧ㡪 㛫ࡼࡾࡶ㛗ࡵ┠ᶆ್ࢆタᐃࡋ 0.8㹼0.9 ⛊ࡋࡓࠋ 2.2 ᐊࡢෆᵝ ᮏㅮᇽࡣᅗ 1 ♧ࡍ࠾ࡾ㸪ᗙᖍഃࡢᚋቨࡀพ᭤㠃 ࢆᙧᡂࡍࡿᡪᙧࡢᖹ㠃ࣉ࡛ࣛࣥ࠶ࡿࠋพ᭤㠃㉳ᅉࡍ ࡿ࢚ࢥ࣮➼ࡢ㡢㡪㞀ᐖࢆ㑊ࡅࡿࡓࡵࡣ㸪㡢ࡢᣑᩓᛶ ࢆ㧗ࡵࡿࡇࡸ㸪᭤㠃ࡽࡢᑕ㡢࢚ࢿࣝࢠ࣮ࢆᢚ࠼ ࡿࡇࡀᚲせ⪃࠼ࡽࢀࡓࠋᮏ࡛ࡣ᭤㠃ࡽࡢ ᑕ㡢ࢆపῶࡍࡿࡇࢆ㔜どࡋ㸪ṧ㡪㛫ࡢ┠ᶆ್㸪࿘ Ἴᩘࡈࡢ྾㡢ຊࡢࣂࣛࣥࢫࢆ⪃៖ࡋ᳨࡚ウࢆ⾜ࡗࡓࠋ ࡑࡢ⤖ᯝ㸪᭱⤊ⓗࡣ⾲ 2 ♧ࡍෆᵝ(a)ࡋࡓࠋ ྾㡢ᮦࡢ㓄⨨࠾ࡼࡧ㑅ᐃࡢ㡢ሙゎᯒࡣ㸪ീἲ 㡢⥺ἲࢆࣁࣈࣜࢵࢻࡋࡓၟ⏝ࢯࣇࢺ࢙࢘ ODEON ࢆ⏝ࡋࡓࠋゎᯒࣔࢹࣝࢆᅗ 3 ♧ࡍࠋᮏㅮᇽࡣᑠつ ᶍ࡛࠶ࡿࡓࡵ㸪ᮘࡢᖥᯈ➼ࡢொჾࡼࡿᑕ㡢ࡢᙳ㡪 ࡀ↓ど࡛ࡁ࡞࠸⪃࠼㸪ࡇࢀࡽࢆࣔࢹࣝ⌧ࡋࡓࠋ ࡲࡓ㸪ゎᯒ᮲௳ࡣ㡢⥺ᩘ 6500 ᮏ㸪ീἲࡼࡿィ⟬⠊ ᅖࡣᑕᅇᩘ 10 ᅇࡲ࡛㸦௨㝆ࡣ㡢⥺ἲࡼࡾィ⟬㸧㸪 ࣥࣃࣝࢫᛂ⟅㛗 1500ms㸪㡢※ࡣ↓ᣦྥᛶ㡢※ࡋᅗ 3♧ࡍᩍቭ୰ኸタᐃࡋࡓࠋ ࡇࡇ࡛㸪ᚋቨ᭤㠃࡞ࡢቨ㠃ࢆᑕᛶࡋࡓሙྜࡢ ᙳ㡪ࡘ࠸᳨࡚ウࡋࡓࢆ♧ࡍࠋ᳨ウ࡛ࡣ㸪⾲ 2 ♧ ࡍࠕᵝ(a)㸸ᐇ㝿タィࡋࡓෆᵝࠖ㸪ࠕᵝ(b)㸸ᑐ ↷ࡋ࡚᭤㠃ࢆᑕᛶࡋࡓሙྜࡢෆᵝࠖࡢண ⤖ᯝࢆẚ㍑ࡋࡓࠋ 2.2.1 ṧ㡪㛫࿘Ἴᩘ≉ᛶ ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥṧ㡪ィ⟬ࡼࡿṧ㡪 㛫࿘Ἴᩘ≉ᛶࡢண ⤖ᯝࢆᅗ 4㸪᳨ウ⏝ࡋࡓෆᮦ ࡢ྾㡢⋡᥎ᐃ್ࢆᅗ 5 ♧ࡍࠋ ᅗ 4 ࡼࡾ㸪ṧ㡪ィ⟬ࡼࡿෆᵝ(a)(b)ࡢண ⤖ᯝ ࢆẚ㍑ࡍࡿ㸪୰㡢ᇦࡢṧ㡪㛫ࡣྠ➼⛬ᗘ࡛࠶ࡿࡀ㸪 (a)ࡣᚋቨ᭤㠃ప㡢ᇦࡢ྾㡢⋡ࡀ㧗࠸ࢫࣜࢵࢺ㸦ᅗ 5 ᮌ〇ࢫࣜࢵࢺ㸧ࢆ㓄⨨ࡋ࡚࠸ࡿࡓࡵ㸪࿘Ἴᩘ≉ᛶࡢࣂ ࣛࣥࢫࡀⰋ࠸ᵝ࡞ࡗ࡚࠸ࡿࠋࡲࡓ㸪ṧ㡪ィ⟬ᗄ ఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢண ⤖ᯝࢆẚ㍑ࡍࡿ㸪(a) ࡣ୧⪅ࡢண ್ࡁ࡞ᕪࡣ࡞࠸ࡀ㸪(b)ࡣ 250Hz ᖏᇦ ௨ୖࡢᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢண ್ࡀṧ㡪ィ⟬ ࡼࡾࡶ▷ࡃ࡞ࡗ࡚࠸ࡿࠋࡇࢀࡣ㸪ṧ㡪බᘧ㸦Eyring- Knudsen㸧ࡀᣑᩓ௬ᐃࢆ‶㊊ࡍࡿ㡢ሙࡢࡳ࡛ᡂ❧ࡍ ࡿࡢᑐࡋ㸪ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡣ㡢⥺ἲࡼ ࡾᚋ㒊ṧ㡪ࢆồࡵ࡚࠾ࡾ㸪ᣑᩓࡢᝏ࠸㡢ሙ࡛ࡢṧ㡪࢚ ࢿࣝࢠ࣮ࡢῶ⾶≉ᛶࡀィ⟬⤖ᯝᫎࡉࢀ࡚࠸ࡿࡇ ࡀせᅉணࡉࢀࡿࠋࡍ࡞ࢃࡕ㸪(b)ࡢᵝࡣ྾㡢ᮦࡢ ✀㢮ࡸ㓄⨨ࡀ೫ࡾ㸪㡢ࡢᣑᩓࡀᝏࡃᣑᩓ௬ᐃࢆ‶ 0.5 1.0 1.5 2.0 ᐊᐜ✚(m3) ṧ㡪 㛫 (s ) 500 100 1,000 5,000 10,000 50,000 רԈ᪦ྙ 0.10 0.15 0.20 0.25 0.30 0.35 ᑐ㇟ᐊ䛾ṧ㡪㛫┠ᶆ್ ㅮᇽ䠄KnudsenandHarris䠅 䠆୰㡢ᇦ500䚸1000Hzᖹᆒ ⾲ 2 ᐊࡢෆᵝ 㒊 ᵝ(a)㸸ᐇ㝿ࡢタィ ᵝ(b)㸸ᑐ↷ᵝ(᭤㠃ࢆᑕࡋࡓሙྜ) ᗋ ᗙᖍ㒊ศ ࢱ࣮ࣝ࢝࣌ࢵࢺ ᩍቭ㒊ศ ࣇ࣮ࣟࣜࣥࢢ ቨ ᗙᖍഃቨ ձࢥࢫࢱ࣮࣎ࢻ t=25 ղࢲࣀࢵࢡ G(GW80kgt=25 ᡴ) ▼⭯࣮࣎ࢻ t=9.5+12.5 ᗙᖍഃቨ(⭜ቨ) ࢣ࢝ࣝ t=6 + ࢲࣀࢵࢡࢩ࣮ࢺ ᗙᖍᚋቨ ᮌ〇ࢫࣜࢵࢺ 30×45@60(GW32kgt=50+ᐮ෭⣪ᡴ) ▼⭯࣮࣎ࢻ t=9.5+12.5 ᩍቭ㒊ศ ⦎ࡅ⇞ᮌ(ࢲࣛࢺୗᆅ) ኳ ᗙᖍഃ ▼⭯࣮࣎ࢻ t=9.5+12.5 ᒾ⥥྾㡢ᯈ t=9(▼⭯࣮࣎ࢻ t=9.5 ୗᆅ) ᗙᖍഃ(ᚋ㒊ධ㝮) ᒾ⥥྾㡢ᯈ t=9(▼⭯࣮࣎ࢻ t=9.5 ୗᆅ) ᩍቭഃ ᒾ⥥྾㡢ᯈ t=9(▼⭯࣮࣎ࢻ t=9.5 ୗᆅ) ⾲ 1 ᑐ㇟ᐊࡢつᶍ ⏝㏵ 㠃✚ ᐜ✚ ᐜேᩘ ㅮᇽ 360m2 1400m3 245ே ᅗ 1 ᑐ㇟ᐊࡢᴫせᅗ ᅗ 2 ᭱㐺ṧ㡪㛫 O X Y Z O X Y Z 㡢※⨨ ᅗ 3 ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࣔࢹࣝ ᩍቭഃ ᗙᖍഃ 15000 27000 ༢䠖mm
㊊࡛ࡁ࡞࠸ࡓࡵ㸪୧⪅ࡢண ⤖ᯝᕪ␗ࡀ⏕ࡌࡓࡶࡢ ⪃࠼ࡽࢀࡿࠋ 2.2.2 ᫂░ᗘ㸦D ್㸸deutlichkeit㸧 ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿ 250㸪1000Hz ᖏᇦ ࠾ࡅࡿ D ್ࡢศᕸ≧ἣண ⤖ᯝࢆࡑࢀࡒࢀᅗ 6㸪7 ♧ࡍࠋD ್ࡣ㸪ࣥࣃࣝࢫᛂ⟅ࡢ࢚ࢿࣝࢠ࣮ᑐࡍ ࡿึᮇ 50ms ࡲ࡛ࡢ࢚ࢿࣝࢠ࣮ࡀ┤᥋㡢ࢆ⿵ᙉࡍࡿ⪃ ࠼ᥦࡉࢀࡓ㡢ኌࡢ᫂░ᗘࢆ⾲ࡍᣦᶆ 7) ࡛࠶ࡾ㸪ᘧ(1) ࡼࡗ࡚⟬ฟࡉࢀࡿࠋ ᅗ 6㸪7 ࡼࡾ㸪ࡕࡽࡶᩍቭṇ㠃ࡢᐊࡢ୰ᚰ㍈ἢࡗ ࡚ D ್ࡀపୗࡍࡿሙᡤࡀᏑᅾࡍࡿࡇࡀண ࡉࢀࡓࠋ ࡇࢀࡣ㸪พ᭤㠃ᙧ≧㉳ᅉࡍࡿᑕ㡢ࡢᙳ㡪⪃࠼ࡽ ࢀ㸪ᚋቨ᭤㠃྾㡢ฎ⌮ࢆࡋࡓࡔࡅ࡛ࡣ㸪ᑕ㡢࢚ ࢿࣝࢠ࣮ࢆᢚไࡋࡁࢀ࡞࠸ࡇࢆ♧၀ࡋ࡚࠸ࡿࠋࡓࡔ ࡋ㸪ᅗ 6 ࡼࡾ㸪(b)ࡢሙྜࡣ(a)ࡼࡾࡶ 250Hz ᖏᇦࡢ D ್ࡀᗈ࠸⠊ᅖ࡛పୗࡍࡿഴྥࡀぢࡽࢀ㸪ᚋቨ᭤㠃㓄 ⨨ࡋࡓ྾㡢ࢫࣜࢵࢺࡢ྾㡢ᛶ⬟ࡀᫎࡉࢀ࡚࠸ࡿ⪃ ࠼ࡽࢀࡿࠋ୍᪉㸪ᅗ 7 ࡢ 1000Hz ᖏᇦ࡛ࡣ D ್ࡀపୗ ࡍࡿሙᡤࡢ್ࡸ⠊ᅖࡁ࡞ᕪ␗ࡣぢࡽࢀ࡞ࡗࡓࠋ ᅗ 4 ࡼࡾᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩ࡛ࣙࣥࡣ 1000Hz ᖏᇦࡢ ṧ㡪ࡀ(b)ࡢ᪉ࡀ▷ࡃ࡞ࡿண ࡉࢀ࡚࠸ࡿࠋࡇࢀࡼ ࡾ㸪ᚋᮇࡢᑕ㡢࢚ࢿࣝࢠ࣮ࡀᑠࡉࡃ࡞ࡾ㸪(b)ࡢ D ್ ࡣ(a)ࡼࡾࡶయⓗ㧗ࡃ࡞ࡿࡇࡀணࡉࢀࡓࠋࡋ ࡋ㸪ᑕ㡢ࡢᙳ㡪ࡀ㢧ⴭ⾲ࢀࡿሙᡤ࡛ࡣ㸪(a)(b) ࡁ࡞ᕪ␗ࡣぢࡽࢀ࡞ࡗࡓࠋࡋࡓࡀࡗ࡚㸪(a)࠾࠸࡚ ᚋቨ᭤㠃ࡸࡑࡢࡢቨ㓄⨨ࡋࡓ྾㡢ᮦࡣ㸪ᑕ㡢ࡢ ᙳ㡪ࡀ⾲ࢀࡸࡍ࠸ሙᡤᑐࡋ࡚ຠᯝⓗస⏝ࡍࡿྍ⬟ ᛶࡀ࠶ࡿ⪃࠼ࡽࢀࡿࠋ ௨ୖࡢ⤖ᯝࡼࡾ㸪ᐊࡢᣑᩓᛶࢆ㜼ᐖࡏࡎ㸪ྛ࿘Ἴᩘ ᖏᇦ࡛ࣂࣛࣥࢫⰋࡃ㡢ኌࡢ᫂░ᗘࢆ☜ಖࡍࡿࡓࡵࡣ㸪 ྾㡢ᮦࡢ✀㢮ࡸ㓄⨨ࡀ೫ࡽ࡞࠸ࡇࡸ㸪ᑕ㡢ࡢ㞟୰ ᐤࡍࡿ㒊ࢆ≉ᐃࡋ࡚㸪྾㡢࡞ࡢᑐ⟇ࢆࡍࡿࡇ ࡣຠᯝⓗ࡛࠶ࡿࡇࡀ♧၀ࡉࢀࡓࠋ 3 ❹ᕤᚋࡢᐊෆ㡢㡪ᛶ⬟ 3.1 ᐊయࡢᖹᆒⓗ࡞ᐊෆ㡢㡪ᛶ⬟ ᐊయࢆホ౯ࡍࡿࡓࡵࡣ㸪ᅗ 8 ♧ࡍᩍቭ୰ኸ ࡽ 1.0m 㞳ࢀࡓ⨨ S01 ↓ᣦྥᛶࢫࣆ࣮࣮࢝ࢆタ⨨ࡋ㸪 TSP ಙྕࢆ⏝࠸࡚ᐇࡋࡓࠋ ᐃⅬࡣᗙᖍ㒊ศᆒ➼ 㓄⨨ࡋࡓ R01㹼05 ࡢ 5 Ⅼࡋ㸪ࡑࡢᖹᆒ್ࢆホ౯ࡋࡓࠋ 0.1 1 125 250 500 1000 2000 4000 8000 ṧ㡪 㛫 (s ) 䜸䜽䝍䞊䝤䝞䞁䝗୰ᚰ࿘Ἴᩘ(Hz) (a)ᗄఱ㡢㡪䝅䝭䝳䝺䞊䝅䝵䞁 (a)ṧ㡪ィ⟬್(Eyring) (b)ᗄఱ㡢㡪䝅䝭䝳䝺䞊䝅䝵䞁 (b)ṧ㡪ィ⟬್(Eyring) 2 (a) (b) ᅗ 6 250Hz ᖏᇦࡢ D ್ண ⤖ᯝ P1 P1 P1 P1 P1 P1 P1 P1 (a) (b) ᅗ 7 1000Hz ᖏᇦࡢ D ್ண ⤖ᯝ 0.3 0.4 0.5 0.6 0.7 0.8 0.0 0.2 0.4 0.6 0.8 1.0 125 250 500 1000 2000 4000 ྾㡢 ⋡ 䜸䜽䝍䞊䝤䝞䞁䝗୰ᚰ࿘Ἴᩘ(Hz) 䝍䜲䝹䜹䞊䝨䝑䝖 䝣䝻䞊䝸䞁䜾 䜰䝁䝇䝍䝪䞊䝗 䝎䜲䝜䝑䜽G 䜿䜲䜹䝹 ᮌ〇䝇䝸䝑䝖 ▼⭯䝪䞊䝗 ᒾ㠃྾㡢ᯈ ᅗ 4 ෆᵝ᳨ウࡢṧ㡪㛫࿘Ἴᩘ≉ᛶண ⤖ᯝ ᅗ 5 ෆᮦࡢ྾㡢⋡᥎ᐃ್ ܦ ൌ ହ௦ଶሺݐሻ݀ݐ ଶ ஶ ൗ ሺݐሻ݀ݐ (1) 㸸㡢ᅽ ݐ㸸ᑕ㡢ࡢ฿᮶้㸦ms㸧
3.1.1 ṧ㡪㛫 ṧ㡪㛫࿘Ἴᩘ≉ᛶࡢ ᐃ⤖ᯝࢆᅗ 9 ♧ࡍࠋṧ㡪 㛫ࡣ 500,1000Hz ᖏᇦᖹᆒ࡛ 0.9 ⛊㸪୰࣭㧗㡢ᇦ࠾ ࠸࡚ᖹᆠ࡞࿘Ἴᩘ≉ᛶ࡛࠶ࡾ㸪ᴫࡡ┠ᶆ್ࢆ‶㊊ࡍࡿ ⤖ᯝ࡛࠶ࡗࡓࠋ 3.1.2 ᫂░ᗘ㸦STIr㸧 MTI,STIr ࡢ ᐃ⤖ᯝࢆᅗ 10 ♧ࡍࠋSTIr ࡣ 0.69 ࡛ ࠶ࡾ㸪⾲ 3 ♧ࡍ᪥ᮏᘓ⠏Ꮫ⎔ቃᇶ‽ AIJES-S0002-20118)ࡢ 2ndࢡࣛࢫࢆ‶㊊ࡍࡿ⤖ᯝ࡛࠶ࡗࡓࠋࡇࡢࢡࣛ ࢫࡣࠕ⫈ࡁྲྀࡾࡃࡉࡣࢇឤࡌ࡞࠸ࠖࡉࢀࡿ ᛶ⬟࡛࠶ࡾ㸪㡢ኌࡼࡿሗఏ㐩ࡀ✵㛫ࡢ㔜せ࡞ᛶ⬟ ࡢ୍ࡘࡋ࡚⨨࡙ࡅࡽࢀࡿሙྜồࡵࡽࢀࡿホ౯࡛ ࠶ࡿࠋ௨ୖࡢ⤖ᯝࡼࡾ㸪ᮏᩍᐊࡣㅮ₇࣭ㅮ⩏➼ࡢ⏝ ᑐࡋ㸪༑ศ࡞ᛶ⬟ࢆ᭷ࡍࡿࡇࡀ☜ㄆࡉࢀࡓࠋ 3.2 㡢㡪㞀ᐖࡢ᭷↓ ᩍቭ⨨࡛ࢫࣆ࣮ࢳࢆࡋࡓሙྜࡢ㡢㡪㞀ᐖࡢ᭷↓ࢆ ☜ㄆࡍࡿࡓࡵࡣ㸪ᅗ 8 ♧ࡍᩍቭ୰ኸ S02 ↓ᣦྥ ᛶࢫࣆ࣮࣮࢝ࢆタ⨨ࡋ㸪TSP ಙྕࢆ⏝࠸࡚ᐇࡋࡓࠋ ᐃⅬࡣ㸪ᐊࡢᑐ⛠ᛶࢆ⏝ࡋ㸪r01㹼14 ࡢ 1 ิ࠾ࡁࡢ 14Ⅼࡋࡓࠋ 3.2.1 ࢚ࢥ࣮ࢱ࣒ࣃࢱ࣮ࣥ ௦⾲Ⅼ࠾ࡅࡿ 1000Hz ᖏᇦࡢ࢚ࢥ࣮ࢱ࣒ࣃࢱ࣮ࣥ ᐃ⤖ᯝࢆᅗ 11 ♧ࡍࠋᩍቭṇ㠃ิࡢ ᐃⅬ r04㸦ᅗ 1 1(2)㸧ࡣᑕ㡢ࡀ㞟୰ࡍࡿⅬ࡛࠶ࡾ㸪r01㸦ᅗ 11(1)㸧㹼 05 ࡛ᙉ࠸ᑕ㡢ࡀ 0.2 ⛊ࡲ࡛⥆ࡅ࡚฿᮶ࡍࡿഴྥࡀぢ ࡽࢀࡓࡀ㸪࡚ࡢ ᐃⅬ࠾࠸࡚᭷ᐖ࡞࢚ࢥ࣮ࡣほ ࡉࢀ࡞ࡗࡓࠋ 3.2.2 ᫂░ᗘ㸦STIr㸧 ᗙᖍࡢิࡈࡢ STIr ᖹᆒ್࠾ࡼࡧ್᭱㸪᭱ᑠ್㸪 ๓㏙ࡋࡓ㡢ኌఏ㏦ᛶ⬟ࡢࢡࣛࢫ⠊ᅖࢆᅗ 12 ♧ࡍࠋ ᐃⅬ r01㹼05 ࡣ㸪ࡢ ᐃⅬẚ㍑ࡋ࡚㡢ኌఏ㏦ᛶ⬟ ࡀ 1 ࣛࣥࢡప࠸ 3rdࢡࣛࢫ࡛࠶ࡗࡓࠋࡇࢀࡣ㸪ᅗ 11 ࡛ ☜ㄆࡉࢀࡓᑕ㡢ࡢ㞟୰ࡀ᫂░ᗘᙳ㡪ࢆཬࡰࡋࡓ⤖ ᯝ࡛࠶ࡿ⪃࠼ࡽࢀࡿࠋࡋࡋ㸪ᮏㅮᇽࡣ㟁Ẽ㡢㡪タ ഛࢆ⏝ࡍࡿࡇࢆ๓ᥦࡋ࡚࠾ࡾ㸪ᣑኌ㡢ࡣኳ ศᩓ㓄⨨ࡉࢀࡓᇙ㎸ᆺࢫࣆ࣮࣮࢝ࡽ࿊♧ࡉࢀࡿࡓࡵ㸪 ㏻ᖖࡢ⏝᪉ἲ࠾࠸࡚ࡣ㸪ࡇࡢࡼ࠺࡞᫂░ᗘ೫ࡾ ࡣ⏕ࡌࡃ࠸⪃࠼ࡽࢀࡿࠋ 0.55 0.65 0.75 r01㹼05 r11㹼15 r21㹼24 ST Ir ᖹᆒ ್ ᐃⅬ 3rd 2nd ್᭱ ᭱ᑠ್ ᖹᆒ್ ᅗ 10 MTI㸪STIr ᐃ⤖ᯝ ᅗ 12 ᗙᖍิࡈࡢ STIr ᖹᆒ್㡢ኌఏ㏦ᛶ⬟ࢡࣛࢫ ᅗ 8 㡢※㸪 ᐃⅬࡢ⨨ 0.1 1 125 250 500 1000 2000 4000 8000 ṧ㡪 㛫 (s ) 䜸䜽䝍䞊䝤䝞䞁䝗୰ᚰ࿘Ἴᩘ(Hz) ᐇ ᖹᆒ್ 2 ᅗ 9 ṧ㡪㛫࿘Ἴᩘ≉ᛶ (1)r01 (2)r04 (3)r07 (4)r14 ᅗ 11 ௦⾲Ⅼࡢ࢚ࢥ࣮ࢱ࣒ࣃࢱ࣮ࣥ㸦1000Hz ᖏᇦ㸧 0.55 0.65 0.75 125 250 500 1000 2000 4000 8000 STIr MT I䠋 ST Ir 䜸䜽䝍䞊䝤䝞䞁䝗୰ᚰ࿘Ἴᩘ(Hz) ⾲ 3 㡢ኌఏ㏦ᛶ⬟ࡢࢡࣛࢫࡑࢀࡽࡢ⨨࡙ࡅ ࢡࣛࢫ ࠕ⫈ࡁྲྀࡾࡃࡉࠖ ࠕ⫈ࡁྲྀࡾ㛫㐪࠸ࠖ STIr 1st ឤࡌ࡞࠸ 㸦0㹼2%㸧 ⏕ࡌ࡞࠸ 㸦0㹼2%㸧 0.84㹼 2nd ࢇឤࡌ࡞࠸ 㸦2㹼16%㸧 0.65㹼0.84 3rd ឤࡌࡿࡇࡀ࠶ࡿ 㸦16㹼50%㸧 0.55㹼0.65 4th ⱝᖸ⏕ࡌࡿ 㸦2㹼5%㸧 㹼0.55 㸨᪥ᮏᘓ⠏Ꮫ⎔ቃᇶ‽ AIJES-S0002-2011 r01 r02 r03 r04 r05 r06 r07 r08 r09 r10 r11 r12 r13 r14 䠖㡢※ 䠖 ᐃⅬ 1000mm S02 S01 R05 R03 R04 R02 R01 ᖜ 0.5 0.0 Time[s] ᖜ 0.5 0.0 Time[s] 0.5 0.0 Time[s] ᖜ ᖜ 0.5 0.0 Time[s]
4. ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢண ⢭ᗘ พ᭤㠃࡛ᙧᡂࡉࢀࡓ✵㛫ᑐࡍࡿᗄఱ㡢㡪ࢩ࣑ࣗࣞ ࣮ࢩࣙࣥࡢ㡢ሙண ⢭ᗘࢆ☜ㄆࡍࡿࡇࢆ┠ⓗ㸪3.2 ♧ࡋࡓᐇ ⤖ᯝண ⤖ᯝࡢᑐᛂ㛵ಀࢆ᳨ウࡋࡓࠋ 4.1 ᑕ㡢ࡢ฿᮶≧ἣ ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿᑕ㡢ࡢ฿᮶㛫 ᑐࡍࡿண ⢭ᗘࢆ☜ㄆࡍࡿࡓࡵ㸪ࣥࣃࣝࢫᛂ⟅ ࡢ㛫㛵ᩘ࡛ᅗ♧ࡋࡓࣜࣇࣞࢡࢺࢢ࣒ࣛࡽᚓࡽࢀࡓ ᖹἼᙧࢆẚ㍑ࡋࡓࠋᖹἼᙧࡣ㸪ࣜࣇࣞࢡࢺ ࢢ࣒ࣛࡢໟ⤡⥺ࢆ㸪ࣄࢺࡢ⫈ぬࡢ✚ศ≉ᛶࢆᶍᨃ ࡋ࡚ᖹࡋࡓࡶࡢ࡛࠶ࡾ㸪ᘧ(2)ࡼࡾ⟬ฟࡉࢀࡿ 9) ࠋ ࡞࠾㸪ᒣ⏣ࡽ5)ࡢ◊✲ࢆཧ⪃ᐃᩘȫࡣ 10ms ࢆ᥇ ⏝ࡋࡓࠋ ܮሺݐሻ ൌ ͳͲ݈݃ଵൣఛషభቄషಮ మሺ௨ሻ௫ሾିሺ௧ି௨ሻȀఛሿௗ௨ቅȀబమ൧ (2) ߬㸸ᐃᩘ ݁㸸ໟ⤡⥺݁ሺݐሻ ܮሺݐሻ㸸ໟ⤡⥺݁ሺݐሻࡢ RMS ࣞ࣋ࣝ㸦dB㸧 ࡇࡇ࡛ࡣ୍ࡋ࡚㸪୍⯡࢚ࢥ࣮ࢆឤࡌࡸࡍ࠸ ࡉࢀࡿ㧗㡢ᇦࡢ 2000Hz ᖏᇦࡘ࠸᳨࡚ウࡋࡓࠋᐇ ࡼࡾᑕ㡢ࡀ㞟୰ࡍࡿࡇࡀ☜ㄆࡉࢀࡓ ᐃⅬ r04㸦ᅗ 8㸧࠾ࡅࡿᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥᐇ ࡢᑐᛂ㛵 ಀࢆᅗ 13 ♧ࡍࠋᅗ 13(1)(2)ࢆẚ㍑ࡍࡿ㸪0.15 ⛊ࡲ ࡛ࡢᖹἼᙧࡣ㢮ఝᛶࡀぢࡽࢀࡓࡀ㸪ࡑࢀ௨㝆ࡣ ≉ᚩࢆᤊ࠼ࡽࢀ࡚࠸࡞࠸ࠋ≉㸪ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞ ࢩࣙࣥࡼࡿィ⟬⤖ᯝࡢ 0.23 ⛊㸪0.32 ⛊㏆࡛ࡣᖹ Ἴᙧࡀ㊴ࡡୖࡀࡾ㸪ࡇࢀࡣ࢚ࢥ࣮ࡀ㉳ࡇࡿྍ⬟ᛶࢆ ♧ࡋ࡚࠸ࡿࡀ㸪ᐇ ࡛ࡣࡇࡢഴྥࡣぢࡽࢀ࡞࠸ࠋࡇࢀ ࡣ㸪⏝ࡋࡓᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢไ⣙ࡽ㸪 ᑕḟᩘࢆ᭱ 10 ᅇࡋ㸪ࡑࢀ௨ୖ㧗ḟࡢᑕ㡢ࡢ฿ ᮶ࡀྠᅗ⾲⌧ࡉࢀ࡚࠸࡞࠸ࡇࡀཎᅉ⪃࠼ࡽࢀࡿࠋ ࡇࢀࡼࡾ㸪㡢㡪㞀ᐖࡢཎᅉ࡞ࡿࡇࡀᠱᛕࡉࢀࡿ ᑕ㡢ࡢ฿᮶㛫ࡀᚋᮇ࡞ࡿሙྜࡣ㸪ᚋᮇ㧗ḟ ᑕ㡢ᡂศࡲ࡛ィ⟬ࡋ࡚⾲⌧ࡍࡿ㸪⿵ṇࢆࡍࡿ࡞ࡢ ᑐᛂࡀᚲせ⪃࠼ࡽࢀࡿࠋࡋࡋ㸪ᗄఱ㡢㡪ࢩ࣑ࣗࣞ ࣮ࢩ࡛ࣙࣥࡣ㸪ቨ㠃ᑕᅇᩘࡀከࡃ࡞ࡿ㸪⌧ᐇࡢ 㡢ሙࢆᤊ࠼ࡿࡢࡀ㞴ࡋࡃ࡞ࡿࠋࡋࡓࡀࡗ࡚㸪ᗄఱ㡢㡪 ࢩ࣑࣮ࣗࣞࢩࣙࣥࢆ㡢ሙࡢண ⏝ࡍࡿ㝿ࡣ㸪ண ᑐ㇟ࢆึᮇࡢᑕ㡢ᑐࡍࡿᑕ⤒㊰࠾ࡼࡧᑐ⟇ࢆ ㅮࡌࡿࡁቨ㠃ࡢ≉ᐃ㝈ᐃࡍࡿ㸪ࡶࡋࡃࡣᚋᮇ ᑕ㡢ᑐࡍࡿ⿵ṇ᪉ἲࢆ᳨ウࡋ㸪ண ⢭ᗘࢆ㧗ࡵࡿᚲ せࡀ࠶ࡿࠋ 4.2 ≀⌮ᣦᶆࡢண ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢண ⢭ᗘࢆ㡢㡪ᣦᶆ ࡽ☜ㄆࡍࡿࡓࡵ D ್ࢆẚ㍑ࡋࡓࠋྛ࿘Ἴᩘᖏᇦ࠾ ࡅࡿᐇ ண ࡢ D ್ࡢᑐᛂࢆᅗ 14 ♧ࡍࠋᅗ 14 ࡼ ࡾ㸪125Hz ᖏᇦ࡛ࡣᐇ ್ண ್ࡢᑐᛂࡣⰋࡃ࡞࠸ ࡀ㸪250Hz ᖏᇦ௨ୖ࡛ࡣṇࡢ┦㛵ࡀぢࡽࢀࡓࠋࡲࡓ㸪 ᅗ 11㸪12 ࡼࡾ㸪ᑕ㡢ࡀ㞟୰ࡋࡸࡍ࠸ࡇࡀ☜ㄆࡉ ࢀࡓ ᐃⅬ r01㹼05 ࡢ್ࢆ㸪ᅗ 14 ㉥ۑ༳࡛ࣉࣟࢵࢺ ࡋࡓࠋࡑࡢ⤖ᯝ㸪ᑕ㡢ࡀ㞟୰ࡍࡿⅬࡣ㸪┦㛵ࡀぢࡽ ࢀࡓ࡚ࡢᖏᇦ࡛ண ್ࡀᐇ ್ࡼࡾࡶࡁࡃ⟬ฟࡉ ࢀࡿഴྥࡀぢࡽࢀࡓࠋࡋࡓࡀࡗ࡚㸪ᗄఱ㡢㡪ࢩ࣑ࣗࣞ ࣮ࢩࣙࣥࡼࡾ D ್ࢆண ࡍࡿࡇࡣྍ⬟࡛࠶ࡿࡀ㸪 พ᭤㠃㉳ᅉࡍࡿ㡢㡪㞀ᐖᑐ⟇ࢆ᳨ウࡍࡿ㝿ࡣ㸪⟬ ฟ್ࡼࡾࡶᏳഃぢ✚ࡶࡿᚲせࡀ࠶ࡿ⪃࠼ࡽࢀࡿࠋ 5. ࡲࡵ ᡪᙧࡢᑠつᶍㅮᇽࡢィ⏬࠾࠸࡚㸪ᗄఱ㡢㡪ࢩ࣑ࣗ ࣮ࣞࢩࣙࣥࡼࡾᐊෆ㡢㡪᳨ウࢆ⾜ࡗࡓࢆሗ࿌ࡋ ࡓࠋ❹ᕤᚋࡢᐇ ࡼࡾ㸪ᠱᛕࡉࢀࡓ㡢㡪㞀ᐖࡀⓎ⏕ ࡋ࡚࠸࡞࠸ࡇ㸪᪥ᮏᘓ⠏Ꮫࡀ♧ࡍ㡢ኌఏ㏦ᛶ⬟ࡢ ᥎ዡ್ࢆ‶㊊ࡋ࡚࠸ࡿࡇࢆ☜ㄆࡋࡓࠋ ࡲࡓ㸪ᮏࢆᇶᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡼ ࡿพ᭤㠃ࢆ᭷ࡍࡿ✵㛫ࡢ㡢ሙࡢண ⢭ᗘࢆ᳨ドࡋࡓࠋ ࡑࡢ⤖ᯝ㸪ึᮇ㞟୰ࡍࡿᑕ㡢ࡢ≉ᚩࢆᤊ࠼ࡽࢀ࡚ ࠸ࡿࡇࡸ㸪250Hz ᖏᇦ௨ୖࡢ D ್ࡣᑐᛂࡀぢࡽࢀ ࡿࡀ㸪ᑕ㡢ࡀ㞟୰ࡋࡸࡍ࠸ሙᡤࡣ༴㝤ഃண ࡉࢀ ࡿഴྥࡀ࠶ࡿࡇࢆ☜ㄆࡋࡓࠋ௨ୖࡢ⤖ᯝࡼࡾ㸪ᗄఱ 㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡣ㸪ᑡ࡞ࡃࡶึᮇ฿᮶ࡍࡿ ᑕ㡢ࡸ㸪250Hz ᖏᇦ௨ୖࡢ D ್ࡢண ࡣ⏝ྍ⬟ ⪃࠼ࡽࢀࡿࠋ ࡋࡋ࡞ࡀࡽ㸪ᮏẚ㍑⤖ᯝࡣ୍ࡢࡶࡢ࡛࠶ࡿࡓ ࡵ㸪⥅⥆ⓗண ᐇ ᑐࡍࡿẚ㍑᳨ウࢆ⾜࠺ᚲせ ࡀ࠶ࡿ⪃࠼ࡽࢀࡿࠋࡑࢀࡽࢆ㋃ࡲ࠼㸪ᗄఱ㡢㡪ࢩ࣑ ࣮ࣗࣞࢩࣙࣥࢆᐇົࡢ㐺⏝㝈⏺ࡸ㸪⟬ฟࡉࢀࡓ≀⌮ ᣦᶆࡘ࠸᳨࡚ウࡋࡓ࠸ࠋ -60 -50 -40 -30 -20 -10 0 10 20 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 ┦ ᑐ 䝺 䝧 䝹 (d B ) time(s) ᖹἼᙧ ໟ⤡⥺ -60 -50 -40 -30 -20 -10 0 10 20 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 ┦ ᑐ 䝺 䝧 䝹 (d B ) time(s) ᖹἼᙧ ໟ⤡⥺ (2)ᐇ ᅗ 13 ࣜࣇࣞࢡࢺࢢ࣒ࣛࡢẚ㍑㸦2000Hz ᖏᇦ㸧 (1)ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥ ࢚ࢥ࣮ࡀ㉳ࡇࡿ ࡇࢆ♧ࡍ≉ᚩ
ཧ⪃ᩥ⊩ 1㸧୰㔝ᅜ㝯,Ụῲඞᚿ, 3 ྡ㸸ቨ㠃ࡢᑕ⋡ࢆ⪃៖ࡋࡓᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢ᳨ウ㸪᪥ᮏ㡢㡪Ꮫㅮ₇ㄽᩥ㞟(⛅)㸪PP1197-1198㸪2011 ᖺ 2㸧⋢▼⿱ஓ,㯮ᮌⲮ୍㑻㸸ࢫࢸ࣮ࢪᐈᖍࡢ㐃ᡂ㡢ሙ㛵ࡍࡿᐇ ᗄఱ㡢㡪ゎᯒ,W ᕷẸ㤋࣮࣍ࣝࢆᑐ㇟ࡋࡓᇶ♏ⓗ᳨ウ㸪᪥ ᮏᘓ⠏ᏛᏛ⾡ㅮ₇᱾ᴫ㞟㸪PP383-384㸪2008 ᖺ 3㸧᳃῟୍,ྜྷ㔝㍜,బ⸨ྐ᫂㸸ᒇእ㡢ሙ࠾ࡅࡿࣥࣃࣝࢫᛂ⟅ࡢ ᐃ-ᗄఱ㡢㡪ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢẚ㍑᳨ウ-㸪᪥ᮏ㡢㡪Ꮫㅮ₇ ㄽᩥ㞟()㸪PP1263-1264㸪2011 ᖺ 4㸧᪥ᮏᘓ⠏Ꮫ⎔ቃᕤᏛጤဨ㸸Ꮫᰯタࡢ㡢⎔ቃಖつ‽࣭タィᣦ㔪㸪P10㸪♫ᅋἲே᪥ᮏᘓ⠏Ꮫ㸪2008 ᖺ 5㸧ᒣ⏣♸⏕,᪥㧗Ꮥஅ,㕥ᮌ㝧୍㸸ᐊෆ㡢㡪タィࡢࡓࡵࡢ࢚ࢥ࣮ࡢᖹ᫆࡞᳨ฟ᪉ἲ㸪ᘓ⠏㡢㡪◊✲㈨ᩱ㸪AA2005-24㸪2005 ᖺ 6㸧⏣୰,ୖㅍ,᳃ᮏᨻஅ,బ⸨㐓ே㸸ࢻ࣮࣒✵㛫ࡢ㡢㡪-࢚ࢥ࣮ࡢ᳨▱⫈ࡁྲྀࡾࡃࡉ-㸪ᘓ⠏㡢㡪◊✲㈨ᩱ㸪AA2006-44㸪2006 ᖺ 7㸧๓ᕝ⣧୍,᳃ᮏᨻஅ,㜰ୖබ༤㸸ᘓ⠏࣭⎔ቃ㡢㡪Ꮫ㸦➨ 2 ∧㸧㸪P64㸪ඹ❧ฟ∧㸪1990 ᖺ 8㸧᪥ᮏᘓ⠏Ꮫ⎔ቃᕤᏛጤဨ㸸㒔ᕷ࣭ᘓ⠏✵㛫࠾ࡅࡿ㡢ኌఏ㏦ᛶ⬟ホ౯つ‽࣭ྠゎㄝ㸪P6,P36㸪♫ᅋἲே᪥ᮏᘓ⠏Ꮫ㸪2011 ᖺ 9㸧Heinrich Kuttruff㸦⸨ཎᜤྖ,᪥㧗Ꮥஅヂ㸧㸸ᐊෆ㡢㡪Ꮫ,ᘓ⠏ࡢ㡪ࡁࡑࡢ⌮ㄽ㸪ᕷࣨ㇂ฟ∧♫㸪2003 ᖺ
ACCURACY OF SOUND FIELD ESTIMATION OF GEOMETRICAL ACOUSTIC ANALYSIS
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PREDICTION OF SOUND FIELDS IN ROOMS WITH CONCAVE CURVE-M.Nakamura, S.Inoue
The room acoustics of a fan-shaped auditorium was examined by a geometrical acoustics method. This room was designed to avoid the acoustics problem by concave curve and to maintain speech transmission performance. As result of measurement, after this room had been constructed, it was checked that the auditorium has sufficient performance to speech.
Morever, had done comparison of actual measured value with predicted value, to find out validity of geometrical acoustic analysis. As a result, early reflection was correlated with measured value and predicted value, and it was confirmed that accuracy of sound field estimation is good except low frequency sound.
y=0.0235x+0.4802 R²=0.0029 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 ண ⤖ ᯝ ᐇ ⤖ᯝ 125Hzᖏᇦ䛾D್ r01䡚05 y=0.68x+0.1953 R²=0.7467 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 ண ⤖ᯝ ᐇ ⤖ᯝ 1000Hzᖏᇦ䛾D್ r01䡚05 y=0.3831x+0.3344 R²=0.5952 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 ண ⤖ ᯝ ᐇ ⤖ᯝ 250Hzᖏᇦ䛾D್ r01䡚05 y=0.5292x+0.3266 R²=0.7035 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 ண ⤖ᯝ ᐇ ⤖ᯝ 2000Hzᖏᇦ䛾D್ r01䡚05 y=0.4945x+0.2931 R²=0.7588 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 ண ⤖ ᯝ ᐇ ⤖ᯝ 500Hzᖏᇦ䛾D್ r01䡚05 y=0.5774x+0.3245 R²=0.9408 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 ண ⤖ᯝ ᐇ ⤖ᯝ 4000Hzᖏᇦ䛾D್ r01䡚05 (1)125Hzᖏᇦ (2)250Hz ᖏᇦ (3)500Hz ᖏᇦ (4)1000Hz ᖏᇦ (5)2000Hz ᖏᇦ (6)4000Hz ᖏᇦ ᅗ 14 ᐇ ண ࡢ D ್ẚ㍑
