ᮾᛴᘓタᢏ⾡◊✲ᡤሗ No.39 ᢏ⾡◊✲ᡤ 㡢㡪࣭㟁☢⎔ቃࢢ࣮ࣝࣉ U.D.C 537.87
㟁Ἴᬯᐊࢆά⏝ࡋࡓᘓ⠏ᮦᩱࡢ㟁Ἴ㏱㐣≉ᛶホ౯
㸫RC ቨࢆ⏝࠸ࡓᐇ ⤖ᯝ FEM ゎᯒ⤖ᯝࡢẚ㍑㸫
Ώ㎶ ᣅே
㸨ᕝ℩ 㝯
㸨 せ ⣙㸸 ᮏሗ࿌࡛ࡣ㸪ᢏ⾡◊✲ᡤ᪂タࡋࡓ EMC ヨ㦂ᐊ࠾ࡅࡿᘓ⠏ᮦᩱࡢ㟁Ἴ㏱㐣≉ᛶࡢホ౯ἲ㸪ࡉࡽᐇ㝿ヨసࡋࡓ RC ቨヨ㦂 యࡢ㟁Ἴ㏱㐣≉ᛶࡢᐇ ⤖ᯝཬࡧࢩ࣑࣮ࣗࣞࢩࣙࣥࡘ࠸࡚⤂ࡍࡿࠋᮏタࡣ㸪2 ࡘࡢ㟁Ἴᬯᐊ㛫ࡢษࡾቨ㛤ཱྀࢆタ ࡅ࡚࠾ࡾ㸪ࡇࡢ㛤ཱྀྛ✀ࡢᘓᮦࢆྲྀࡾࡅ࡚㟁Ἴ㏱㐣≉ᛶࡢホ౯ࢆ⾜࠺ࡇࡀ࡛ࡁࡿ≉Ṧ࡞㟁Ἴᬯᐊ࡛࠶ࡿࠋࡇࡇ࡛ࡣ㸪ࡇࡢ 㛤ཱྀࢆ⏝࠸ࡓྛ✀ᘓᮦࡢ㟁Ἴ㏱㐣≉ᛶࡢホ౯ἲཬࡧ ᐃ⎔ቃࡀ㐺ษ࡛࠶ࡿࡇࢆ᳨ドࡍࡿࡓࡵ㸪ࡲࡎ㛤ཱྀ࿘ᅖ࠾ࡅࡿ㟁Ἴࡢ ᑕࡢ᭷↓ࡀ ᐃ⤖ᯝཬࡰࡍᙳ㡪ࡘ࠸࡚᭷㝈せ⣲ゎᯒࣔࢹࣝࢆ⏝࠸ࡓࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿ᳨ドࢆ⾜ࡗࡓࠋḟ㸪୍ ࡋ࡚ᐇ㝿ヨసࡋࡓ RC ቨヨ㦂యࡢ㟁Ἴ㏱㐣≉ᛶࡘ࠸࡚ᐇ ࢆ⾜࠸㸪ྠヨ㦂యࡢ᭷㝈せ⣲ࣔࢹࣝࢆᵓ⠏ࡍࡿࡇ࡛ࢩ࣑࣮ࣗࣞ ࢩࣙࣥ⤖ᯝᐇ ⤖ᯝࡢẚ㍑᳨ドࢆ⾜ࡗࡓ⤖ᯝ㸪ᴫࡡ 5dB ⛬ᗘ௨ෆࡢㄗᕪ⠊ᅖ࡛ᐇ ್ࢆ᥎ᐃ࡛ࡁࡿࡇࢆ᫂ࡽࡋࡓࠋ 㺕㺎㺺㺎㺢㺼㸸 㟁Ἴᬯᐊ㸪㛤ཱྀ㒊㸪RC ቨ㸪㟁Ἴ㏱㐣≉ᛶ㸪᭷㝈せ⣲ἲ ┠ ḟ㸸 ࡣࡌࡵ 5& ቨヨ㦂యࡢ㟁Ἴ㏱㐣≉ᛶࡢᐇ ⤖ᯝ )(0 ゎᯒ⤖ᯝࡢẚ㍑ ᖹᯈᮦᩱࡢ㟁Ἴ㏱㐣≉ᛶホ౯ἲ ࡲࡵ 㟁Ἴᬯᐊ㛫㛤ཱྀ㒊ࡢ྾య᭷↓ࡼࡿᙳ㡪᳨ド ࡣࡌࡵ ᘓ⠏ᮦᩱ࠾࠸࡚㸪㟁Ἴࡢ㏱㐣≉ᛶࢆ⢭ᗘⰋࡃィ ࡍࡿࡇࡣ㸪ᘓ≀ෆࡢ㟁Ἴ⎔ቃࢩ࣑࣮ࣗࣞࢩࣙࣥࡸ㸪 ᘓ≀⮬యࡢࢩ࣮ࣝࢻᛶ⬟ࢆண ࡍࡿୖ࡛᭷ຠ࡛࠶ࡿࠋ ≉㸪୍⯡ⓗᘓ≀ᵓ㐀✀ࡢ୰࡛ࡶከࡃ᥇⏝ࡉࢀࡿ RC 㐀ࡣホ౯ᑐ㇟ࡋ࡚㔜せ࡛࠶ࡾ㸪ྛᒃᐊࢆษࡿ RC 㐀ࡢ⪏ຊቨࡸ㛫ษࡾቨࡢ㟁Ἴ㏱㐣≉ᛶࡣࡇࢀࡲ࡛ ༑ศᢕᥱࡉࢀ࡚ࡇ࡞ࡗࡓࠋࡑࡇ࡛㸪ᮏሗ࡛ࡣᐇ≀ ࡢ RC ቨࡢヨ㦂యࢆ〇సࡋホ౯ࢆ⾜ࡗࡓࠋ ୍⯡ⓗᖹᯈ≧ࡢᮦᩱࢆ㏱㐣ࡍࡿ㟁Ἴࡢィ ࢆ⾜࠺ ࡓࡵࡣ㸪ᅗ 1 ♧ࡍࡼ࠺㸪㔠ᒓᯈ༢యࡲࡓࡣ㔠ᒓ ᯈࡢ⾲㠃ྛ✀ࡢ㟁Ἴ྾యࢆ㈞ࡾࡅࡓቨ㠃㛤ཱྀ ࢆタࡅ㸪 ᐃᑐ㇟ࡍࡿヨ㦂య㸦ヨᩱ㸧ࢆ㛤ཱྀタ⨨ ࡍࡿ᪉ἲࡀࡽࢀ࡚࠸ࡿ1)ࠋ ᅗ 1 ᘓᮦホ౯⏝㛤ཱྀ㒊ࡢ✀㢮 ࡋࡋ࡞ࡀࡽ㸪RC ቨࢆࡣࡌࡵࡍࡿᘓ⠏ᮦᩱࡢホ౯ ࢆ⾜࠺ࡓࡵࡣ㸪ࡇࡢ㔜㔞⪏࠼࠺ࡿᛶ⬟ࢆᣢࡘቨ㠃 㛤ཱྀࡀᚲせ࡞ࡿࠋGHz ᖏࡢ㟁Ἴࢆྲྀࡾᢅ࠺࣐ࢡࣟ Ἴศ㔝࡛ࡣ㸪ⓎἻ⣔ᮦᩱᦆኻᮦᩱࢆΰྜࡋࡓࣆ ࣑ࣛࢵࢻᆺ㟁Ἴ྾యࡸࢩ࣮ࢺ≧ࡢ㟁Ἴ྾యࡀホ౯ ᑐ㇟ࡉࢀ࡚ࡁࡓࡓࡵ㸪ࡇࡢࡼ࠺࡞㔜㔞⪏࠼࠺ࡿᘓ ᮦホ౯⏝ࡢቨ㠃㛤ཱྀࡣᚲせࡉࢀ࡚ࡇ࡞ࡗࡓࠋࡑࡇ ࡛㸪ᢏ⾡◊✲ᡤ᪂タࡋࡓ EMC ヨ㦂ᐊ࡛ࡣ㸪᭱ 500kgࡢヨ㦂యࡀタ⨨ྍ⬟࡞㛤ཱྀࢆഛ࠼㸪ࡑࡢ㛤ཱྀࢧ ࢬࡶヨ㦂యᑍἲྜࢃࡏ࡚ 0.6m0.6m㸪0.8m0.8m㸪 1.8m1.8m ࡢ 3 ࣃࢱ࣮ࣥኚࡉࡏࡿࡇࡀ࡛ࡁࡿࠋ ୍⯡ⓗ㟁Ꮚᶵჾࡢ࢚࣑ࢵࢩࣙࣥホ౯⏝࠸ࡿ EMC 㟁 Ἴᬯᐊࡸࣥࢸࢼࡢᨺᑕࣃࢱ࣮ࣥࡢホ౯➼⏝࠸ࡿ࣐ ࢡࣟἼ㟁Ἴᬯᐊࡁࡃ␗࡞ࡿⅬࡣ㸪ࡇࡢ㛤ཱྀࢆഛ ࠼࡚࠸ࡿⅬ㸪㛤ཱྀࢆ㝸࡚࡚ 2 ࡘࡢ㟁Ἴᬯᐊࢆ㞄᥋ࡉ ࡏࡓⅬ࡛࠶ࡿࠋ ᮏሗ࡛ࡣ㸪RC ቨࢆࡣࡌࡵࡍࡿྛ✀ᘓᮦࡢホ౯ࢆ⾜ ࠺ୖ࡛㸪ࡇࡢᮏホ౯⣔ࡢጇᙜᛶࢆ᳨ドࡍࡿࡓࡵ㸪ࡲ ࡎ㸪㛤ཱྀ࠾ࡅࡿ㟁Ἴࡢᑕᙳ㡪ࡀ ᐃ⤖ᯝཬࡰࡍ ᙳ㡪ࡘ࠸᳨࡚ドࢆ⾜ࡗࡓࠋḟ୍ࡋ࡚㸪ᐇ㝿 ヨసࡋࡓ RC ቨヨ㦂యࡢ㟁Ἴ㏱㐣≉ᛶࢆᐇ ࡋ㸪ేࡏ ࡚᭷㝈せ⣲ἲࡼࡿࣔࢹࣜࣥࢢࢆ⾜࠸ࢩ࣑࣮ࣗࣞࢩࣙ ࣥࡼࡿᐇ ್ࡢẚ㍑᳨ドࢆ⾜ࡗࡓ ᖹᯈᮦᩱࡢ㟁Ἴ㏱㐣≉ᛶホ౯ἲ ୍⯡㸪㟁Ἴ㏱㐣≉ᛶࡢホ౯ࢆ⾜࠺ሙྜࡣ ᐃ⣔ ࡣᅗ 2 ♧ࡍࡼ࠺ᵓᡂࡉࢀ㸪ࢿࢵࢺ࣮࣡ࢡࢼࣛ ࢨ(NA)ࡽ㏦ಙࡉࢀࡓಙྕࡣࣥࢸࢼ 1 ࡽᨺᑕࡉࢀ ࡿࠋࡑࡋ࡚㸪㛤ཱྀࢆ㝸࡚ࡓࣥࢸࢼ 2 ࡛ཷಙࡋࡧ NA ධຊࡉࢀࡿࠋࡇࡇ࡛㸪ᘓᮦࢆタ⨨ࡋࡓሙྜ㸪ཬࡧఱ Metal plate Pyramidal absorber Ferrite tiles Test board (a) (b) (c) 79 * 技術研究所 音響・電磁環境グループ U.D.C 537.87電波暗室を活用した建築材料の電波透過特性評価
− RC 壁を用いた実測結果と FEM 解析結果の比較−
渡辺 拓人
＊川瀬 隆治
＊ 79 東急建設技術研究所報No.39 東急建設技術研究所報No.39ࡶ㓄⨨ࡋ࡞࠸ሙྜࡢ᮲௳࡛ࡑࢀࡒࢀ ᐃࢆ⾜࠸୧⪅ࡢ ẚࢆࡗ࡚㸪㏱㐣ῶ⾶⋡ࢆᐃ⩏ࡍࡿࠋ ලయⓗࡣ㸪ձఱࡶ㓄⨨ࡋ࡞࠸ሙྜࡢ㏱㐣⋡ T1ࢆ㸪 NA ࡽ㏦ಙࡉࢀࡿ㟁ຊ Pt NA ᡠࡗ࡚ࡃࡿཷಙ㟁 ຊ Prࡢẚࡋ࡚㸪T1=Pr1/Pt1ᐃ⩏ࡍࡿࠋղྠᵝ㸪 ᘓᮦࢆ㓄⨨ࡋࡓሙྜࡢ㏱㐣⋡ T2= Pr2/Pt2ࢆࡑࢀࡒࢀ ᐃ ࡍࡿࠋճ᭱⤊ⓗ㸪ఱࡶ㓄⨨ࡋ࡞࠸ሙྜࡢ㏱㐣⋡ T1ࢆ ᇶ‽(100%)ࡋ㸪㏱㐣ῶ⾶⋡ࡣ T2/T1ࡋ࡚ᚓࡿࡇࡀ ࡛ࡁࡿࠋ ᅗ 2 ᐃ⣔ࡢࣈࣟࢵࢡᅗ 㟁Ἴᬯᐊ㛫㛤ཱྀ㒊ࡢ྾య᭷↓ࡼࡿᙳ㡪᳨ド ゎᯒࣔࢹࣝ ᅗ 1 ♧ࡋࡓ (a)ࡢࡼ࠺㛤ཱྀ࿘ᅖࢆ㔠ᒓࡢቨ㠃ࡍ ࡿᵓᡂࡀ᭱ࡶ⡆᫆࡞᪉ἲ࡛࠶ࡿࡀ㸪ቨ㠃࡛ᑕࡍࡿ㟁 Ἴࡀ㏦ಙഃࡢᐊෆ࡛ከ㔜ᑕࢆ⧞ࡾ㏉ࡋ㸪ពᅗࡏࡎ㛤 ཱྀࢆ㏱㐣ࡍࡿἼࡢᙳ㡪ࢆཝᐦ⪃៖ࡍࡿሙྜ㸪(b)ࡢࡼ ࠺㛤ཱྀ࿘ᅖ྾యࢆタ⨨ࡍࡿ᪉ἲࡀࡽࢀࡿ 2)ࠋ ≉ 1GHz ௨ୗࡢ MHz ᖏ࡛ࡣ㸪(c)♧ࡍࡼ࠺㸪࠼ ࡤࣇ࢙ࣛࢺࢱࣝࡢࡼ࠺࡞ MHz ᖏᑐᛂࡢ྾యࡀᚲ せ࡞ࡿࡀ㸪ࣇ࢙ࣛࢺࢱࣝࡣ㧗౯࡛࠶ࡿୖ㸪ቨ 㠃㝽㛫࡞ࡃᕤࡍࡿ⢭ᗘࡀせồࡉࢀࡿࠋࡑࡇ࡛㸪ᘓ ᮦホ౯⏝ࡢ㛤ཱྀ㒊⏝࠸ࡿ྾యࡢ᭷↓ࡀ ᐃ⤖ᯝ ཬࡰࡍᙳ㡪ࡘ࠸࡚ホ౯ࢆ⾜ࡗࡓࠋᮏሗ࡛ࡣᐇ㝿ࡢ ᕤᐇ ࡢ㈝⏝ປຊࢆ⪃៖ࡋ㸪ゎᯒࡼࡗ࡚྾య ᭷↓ࡢᙳ㡪᳨ドࢆ⾜ࡗࡓࠋ ᅗ 3 ゎᯒࣔࢹࣝࢆ♧ࡍࠋゎᯒ✵㛫ෆ㒊ࡢ⾲㠃ᑐ ࡋ࡚྾ቃ⏺᮲௳ࢆ㐺⏝ࡍࡿࡇ࡛㸪✵㛫ෆ㒊࠾ࡅ ࡿ㟁Ἴࡢᑕࡀ↓࠸⌮ⓗ࡞ 6 㠃㟁Ἴᬯᐊྠࡌ᮲௳ ࡋࡓࠋ㛤ཱྀ㒊ࡣཌࡳ 10mm ࡢ㔠ᒓᯈ࡛ᵓᡂࡋ㸪ࡑࡢ 㛤ཱྀ࿘ᅖゎᯒୖ⌮ⓗ࡞྾యࡋ࡚స⏝ࡍࡿ྾ ᒙ㸦ቃ⏺᮲௳࡛⾲⌧㸧ࢆタࡅࡓሙྜ྾ᒙࡀ↓࠸ሙ ྜ࠾࠸࡚㸪ࣥࢸࢼ㛫ࡢ㟁Ἴ㏱㐣≉ᛶࢆゎᯒࡍࡿࡇ ࡛ඛᅗ 1 ♧ࡋࡓ㛤ཱྀ㒊ࡢ྾య᭷↓ࡀ ᐃ⤖ᯝ ཬࡰࡍᙳ㡪ࡘ࠸᳨࡚ドࡋࡓࠋ ᅗ 3 㛤ཱྀ㒊ࡢゎᯒࣔࢹࣝ ゎᯒ⤖ᯝ ᅗ 3 ࡢゎᯒࣔࢹࣝ࠾ࡅࡿ㊥㞳 L ࢆ 1Ȣ(=600mm @500MHz) ࡋ㸪ࣥࢸࢼ࢚࣓ࣞࣥࢺࢆᆶ┤᪉ྥ㓄 ⨨ࡋࡓሙྜ࠾࠸࡚㸪㛤ཱྀ㒊ࡢ྾ᒙࡀ᭷ࡿሙྜ↓ ࠸ሙྜࡢ㟁⏺ศᕸࡢẚ㍑ࢆᅗ 4 ♧ࡍࠋ ᅗ 4 ࡼࡾ㸪྾ᒙࡀ࠶ࡿሙྜ࡛ࡣ㏦ಙഃࡢ㟁⏺ศᕸ ࡀ➼᪉ⓗᗈࡀࡗ࡚࠾ࡾ㸪࿘ᅖࡢᑕࡀ࡞࠸ࡇࡀศ ࡿࠋ୍᪉㸪྾ᒙࡀ↓࠸ሙྜ࡛ࡣ㸪㛤ཱྀ㒊ࡽࡢ ᑕࡼࡾᐃᅾἼࡀⓎ⏕ࡋ㸪ศᕸࡀṍࢇ࡛࠸ࡿᵝᏊࡀ☜ ㄆ࡛ࡁࡿࠋ ᅗ 4 ྾ᒙࡢ᭷↓ࡼࡿ㟁⏺ศᕸẚ㍑ ᅗ 5 /ࡢኚࡼࡿ㏱㐣≉ᛶࡢẚ㍑ 0 200 400 600 800 1000 -160 -140 -120 -100 -80 -60 -40 -20 0
()
With absorbing layer Without absorbing layer
L = 1 O
T
ransm
ission (dB
)
Frequency (MHz)
L = 2 O L = 3 OAbsorbing layer Metal plate(t =10)
Tx. Rx.
ὉReflection boundary unit: mm
2O(1200) O(600) O(600) 2O(1200) L L O/2 dipole (500MHz) ὉAbsorbing boundary or O O NA (Network Analyzer) Transmit Receive
Test board or Air
Ant. 1 Ant. 2 Pt(W) d1 d2 Pr(W) Pt2 Pr2 T2 = Test board Pt1 Pr1 T1 = Air EM-wave absorber Transmission T1 T2 Transmission attenution 20 0 E-field [V/m] 10
(a) With absorbing layer (b) Without absorbing layer Absorbing layer
東急建設技術研究所報No.39
ࡋࡋ㸪㛤ཱྀࢆ㏱㐣ࡋࡓἼ╔┠ࡍࡿ㸪୧⤖ᯝ ࡶྠᵝࡢศᕸࢆ♧ࡍᵝᏊࡀ☜ㄆ࡛ࡁࡿࠋḟ㸪୍ ࡋ࡚ L=1Ȣ, 2Ȣ, 3Ȣࡋࡓሙྜࡢ㏦ཷಙࣥࢸࢼ㛫ࡢ 㟁Ἴ㏱㐣≉ᛶࡢẚ㍑ࢆᅗ 5 ♧ࡍࠋࡇࡢ⤖ᯝࡼࡾ㸪L ࡢኚᑐࡋ࡚㸪࠸ࡎࢀࡢ⤖ᯝࡶ྾ᒙ᭷↓ࡼࡿᕪ ␗ࡣᑠࡉ࠸ࡇࡀศࡿࠋ 5& ቨヨ㦂యࡢ㟁Ἴ㏱㐣≉ᛶࡢᐇ ⤖ᯝ )(0 ゎ ᯒ⤖ᯝࡢẚ㍑ 〇 స ࡋ ࡓ RC ቨ ࡢ ヨ 㦂 య ࡣ 㸪 ᑍ ἲ 900×900×200 (mm)㸪㕲➽ࡢ㓄⨨ࢆྵࡴヨ㦂యࡢヲ⣽ᑍἲࢆᅗ 6 ♧ ࡋ㸪ヨ㦂యࡢྲྀࡅ≧ἣ㸪タ⨨ᚋࡢ≧ἣࢆᅗ 7 ཬࡧ ᅗ 8 ࡑࢀࡒࢀ♧ࡍࠋヨ㦂యࡢ㏱㐣ῶ⾶⋡ࡣ㸪๓㏙ࡢ ᅗ 2 ♧ࡍ᪉ἲࡼࡾ ᐃࡋࡓࠋ ࡇࡇ࡛㸪RC ቨࡢ㏱㐣ῶ⾶⋡ࡣ㸪ࢥࣥࢡ࣮ࣜࢺࡢ ẚㄏ㟁⋡ࡀࡁࡃᙳ㡪ࡍࡿࠋẚㄏ㟁⋡ࡣ㸪㟁ẼᕤᏛ ศ㔝࡛ࡣࢥࣥࢹࣥࢧࡢᐜ㔞ࡢࡁࡉࢆ⾲⌧ࡍࡿࡢ⏝ ࠸ࡽࢀ㸪✵Ẽࡢሙྜࢆ 1 ࡋࡓ㸪ࢥࣥࢹࣥࢧࡢ㟁 ᴟ㛫ሸࡍࡿᮦᩱࡼࡗ࡚ᐜ㔞ࡀఱಸ࡞ࡿࡢࢆ ᐃ⩏ࡍࡿ㔞࡛࠶ࡿࠋࡇࡢࡇࡣ㸪ㄏ㟁⋡ࡀ㟁⏺స⏝ ࡍࡿࡇࡼࡿࡶࡢ࡛࠶ࡾ㸪㟁Ἴᑐࡋ࡚ࡣ㸪㟁Ἴࡢ ㏻ࡋ᫆ࡉࢆࡁࡃᕥྑࡍࡿࠋࡍ࡞ࢃࡕ㟁Ἴࡢᑕ⋡࠾ ࡼࡧ㏱㐣⋡ࡣ≀㉁ࡢẚㄏ㟁⋡౫Ꮡࡍࡿ㔞࡛࠶ࡿࠋ ࡲࡓ㸪ཝᐦࡣẚㄏ㟁⋡ࡣ」⣲ᩘ࡛⾲⌧ࡉࢀ㸪」⣲⾲ グࡢẚㄏ㟁⋡ࢆ」⣲ẚㄏ㟁⋡ࡪࠋᮏሗ࡛ࡣ㸪௨ୗ ࡢ᪉ἲࡼࡾ」⣲ẚㄏ㟁⋡ࢆ᥎ᐃࡋࡓࠋ ձ 」⣲ẚㄏ㟁⋡ࡢᐇ㒊㒊ࡢ⤌ྜࡏࢆᬻᐃⓗ௬ ᐃࡋ㸪ࡇࢀᑐࡋ࡚ఏ㏦ F ⾜ิࢆ⏝࠸ࡓᬻᐃゎᯒ ್ࢆᐇ ್ࢆࡶ࿘Ἴᩘẖồࡵ㸪ṧᕪ ࢆồࡵࡿࠋ ղ 」⣲ẚㄏ㟁⋡ᑐࡍࡿṧᕪࢆᐇ㒊࣭㒊 ᑐࡍࡿ 3 ḟඖศᕸࡋ࡚ồࡵ㸪ṧᕪࡀ᭱ᑠ ࡞ࡿ್ࢆ᭱㐺್ࡋ࡚」⣲ẚㄏ㟁⋡ࢆ᥎ᐃࡋ㸪 ゎᯒ᥇⏝ࡍࡿࠋ ఏ㏦ F ⾜ิࢆ⏝࠸ࡓゎᯒ᪉ἲࡣ㸪ࢩ࢙ࣝࢡࣀࣇࡢᘧ ᇶ࡙࠸࡚࠾ࡾ 3) 㸪᮲௳ࡼࡗ࡚ࡣㄗᕪࡀࡁࡃ࡞ࡿࠋ ᪤ሗ 4)࠾࠸࡚ࡶᐇ ್ࡢᕪ␗ࡀぢࡽࢀࡿሙྜࡀ࠶ ࡿࡇ࡞ࢆ♧ࡋࡓࠋࡋࡋ㸪ࡇࡇ࡛ࡣ」⣲ẚㄏ㟁⋡ ࢆ᥎ᐃࡍࡿࡓࡵࡢᬻᐃゎᯒ್ࢆィ⟬ࡍࡿ┠ⓗ࡛࠶ࡿࡓ ࡵ㸪ゎᯒ್ㄗᕪࡀ⏕ࡌ࡚ࡶṧᕪࢆ⧞㏉ࡋィ⟬ ࡋ࡚᭱ᑠ㏆࡙ࡅࡿࡇ࡛㸪᭱⤊ⓗ᭱㐺್ࢆồࡵࡿ ࡇࡀ࡛ࡁࡿࡓࡵ㸪ୖグࡢၥ㢟ࡣ࡞࠸ࡶࡢ⪃࠼ࡽࢀ ࡿࠋᅗ 9 㸪ᅇࡢゎᯒ⏝࠸ࡓṧᕪࡢ 3 ḟඖ ศᕸ᭱㐺࡞」⣲ẚㄏ㟁⋡ࡢ᥎ᐃ⤖ᯝࢆ♧ࡍࠋ ࡇࡢ᥎ᐃࡼࡾᚓࡽࢀࡓ」⣲ẚㄏ㟁⋡ࡢ್ࢆ᥇⏝ࡋ㸪 RC ቨヨ㦂యࣔࢹࣝࡢ᭷㝈せ⣲ἲࡼࡿゎᯒࢆ⾜ࡗࡓࠋ ᐇ ゎᯒࡢ⤖ᯝࢆྜࢃࡏ࡚ᅗ 10 ♧ࡍࠋ ᅗ 6 ᐇ㦂⏝࠸ࡓ 5&ቨヨ㦂యࡢ㓄➽࣭ᑍἲ ᅗ 7 ヨ㦂యࡢྲྀࡅ≧ἣ (a) ๓㠃 (b) ⫼㠃 ᅗ 8 ヨ㦂యタ⨨ᚋࡢᵝᏊ ᅗ 9 」⣲ẚㄏ㟁⋡ ᐇ㒊࣭㒊 ᑐࡍࡿṧᕪ 㻙㻜㻚㻠 㻙㻜㻚㻢 㻙㻜㻚㻤 㻙㻝 㻙㻝㻚㻞 㻙㻝㻚㻠 0 100 200 300 9 8.4 7.8 7.2 ɸ' 䠄ẚㄏ㟁⋡䛾ᐇ㒊䠅 䠢 䠄 ṧ ᕪ 䠅 ɸ䇿 䠄ẚㄏ㟁⋡䛾㒊䠅 ẚㄏ㟁⋡ẖ䛾䠢 (ィ⟬್䛸ᐇ ್䛸䛾ṧᕪ) 200Ͳ300 100Ͳ200 0Ͳ100 ᭱㐺್ İr = 7.4 – j 1.0 東急建設技術研究所報No.39 81
ᅗ ࢩ࣮ࣝࢻᛶ⬟ࡢᐇ ⤖ᯝ ᐇ⥺ ཬࡧゎᯒ⤖ᯝ ◚⥺ ᅗ 10 ࡼࡾ㸪ᐇ ್ゎᯒ್ࡣ 5dB ⛬ᗘ௨ෆࡢᕪ␗ ୍࡛⮴ࡍࡿࡇࡀ☜ㄆ࡛ࡁࡿࠋ࡞࠾㸪⦪㍈ࡢࢩ࣮ࣝࢻ ᛶ⬟ࡣ㏱㐣ῶ⾶⋡ࡢ㏫ᩘࢆࡗࡓ್࡛࠶ࡿ㸬ࡇࢀࡼࡾ㸪 ఏ㏦ F ⾜ิゎᯒࡼࡿᬻᐃゎᯒ್ࢆࡶᐇ ್ࡢ ṧᕪࢆồࡵࡿ᪉ἲࡼࡗ࡚㸪᭱㐺࡞」⣲ẚㄏ㟁 ⋡ࡀ᥎ᐃ࡛ࡁࡿྍ⬟ᛶࡀ♧၀ࡉࢀࡓࠋ ࡲࡵ ᮏሗ࡛ࡣ㸪ᘓ⠏ᮦᩱࡢ㟁Ἴ㏱㐣≉ᛶࡢホ౯ἲ࠾ࡼࡧ ᐇ ࣭ゎᯒࡘ࠸࡚㸪᪂タࡋࡓ EMC ヨ㦂ᐊෆ࠾ ࡅࡿ ᐃ⤖ᯝࢆࡶ⤂ࡋࡓࠋ ᮏタ࠾ࡅࡿ 2 ࡘࡢ㟁Ἴᬯᐊ㛫ࡢษࡾቨタࡅ ࡓᐇ≀ᘓᮦホ౯⏝ࡢ㛤ཱྀ㒊╔┠ࡋ㸪㟁Ἴ㏱㐣≉ᛶ ࢆホ౯ࡍࡿ㝿ࡢ㛤ཱྀ࿘ᅖቨ㠃࠾ࡅࡿᑕᙳ㡪ࡘ࠸ ࡚᭷㝈せ⣲ἲࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿ᳨ドࢆ⾜ࡗࡓࠋ ࡑࡢ⤖ᯝ㸪㛤ཱྀ࿘ᅖࢆ⌮ⓗ࡞྾య࡛そࡗࡓሙྜ㸪 ཬࡧ㛤ཱྀ࿘ᅖࢆ㔠ᒓ㠃㸦ᑕ㠃㸧ࡋࡓሙྜ࠾࠸࡚ ᴫࡡᕪ␗ࡀ࡞࠸ࡇࡀ☜ㄆ࡛ࡁࡓࠋ RC ቨヨ㦂యࡢ㟁Ἴ㏱㐣≉ᛶࡘ࠸࡚ᐇ ࢆ⾜࠸㸪ే ࡏ࡚᭷㝈せ⣲ἲࢩ࣑࣮ࣗࣞࢩࣙࣥࡼࡿẚ㍑᳨ドࢆ⾜ ࡗࡓࠋࡑࡢ⤖ᯝ㸪㟁Ἴ㏱㐣≉ᛶࡢᐇ ⤖ᯝゎᯒ⤖ᯝ ࡣᴫࡡ 5dB ⛬ᗘ௨ෆ୍࡛⮴ࡍࡿࡇࡀ☜ㄆ࡛ࡁࡓࠋࡇ ࡢ⤖ᯝࡼࡾ㸪ఏ㏦ F ⾜ิゎᯒࡼࡿᬻᐃゎᯒ್ࢆࡶ 㟁Ἴ㏱㐣≉ᛶࡢᐇ ್ࡢṧᕪࢆồࡵࡿ᪉ἲ ࡼࡗ࡚㸪RC ቨ⏝࠸ࡿࢥࣥࢡ࣮ࣜࢺᮦᩱࡢ᭱㐺࡞」 ⣲ẚㄏ㟁⋡ࡀ᥎ᐃ࡛ࡁࡿྍ⬟ᛶࡀ♧၀ࡉࢀࡓࠋ ㅰ ㎡ ᮏ◊✲ࡢ୍㒊ࡣ㸪㟷ᒣᏛ㝔Ꮫࡢᶫᮏಟᩍᤵࡢඹྠ◊✲ࡢࡶ⾜ࢃࢀࡓࡶࡢ࡛࠶ࡿࠋࡲࡓ㸪RCቨࡢヨ㦂యࡢタ⨨సᴗ࠾࠸࡚ከ ࡞ࡈຓຊࢆ࠸ࡓࡔ࠸ࡓᢏ⾡◊✲ᡤ Ṋ⏣බྖẶឤㅰ࠸ࡓࡋࡲࡍࠋ ཧ⪃ᩥ⊩ 1㸧㇂ ♸, ᶫᮏ ಟ, ⇃ ᓫᩥ,͆C ᖏ࠾ࡅࡿ⮬⏤✵㛫㏱㐣ἼἲࡼࡿHr, Prྠ ᐃἲ͇, 㟁Ꮚሗ㏻ಙᏛㄽᩥㄅ B(㏻ಙ), Vol.J87-B(5), pp.765-768, 2004-05. 2㸧ᒣᮏ ┿୍㑻, ᒾ ㏻, ␊ᒣ ㈼୍,࣐͆ࢡࣟἼᖏ࠾ࡅࡿᯈ≧㐽࠸ᮦࡢ㏱㐣ಀᩘ ᐃ⨨͇, 㟁Ꮚሗ㏻ಙᏛㄽᩥㄅ B(㏻ಙ), Vol.J94-B(6), pp.771-774, 2011-06. 3㸧➟ᔱ ၿ᠇, ᒣᮌ ඞ๎,͆㟁Ἴࢩ࣮ࣝࢻቨࡢ㏱㐣࣭ᑕᦆኻ㔞ࡢィ⟬͇, 㮵ᓥᢏ⾡◊✲ᡤᖺሗ, Vol.48, pp.189-194, 2000. 4㸧ᕝ℩ 㝯, ⏣㔝 ῟୍, 2 ྡ,͆㕲➽ࢥࣥࢡ࣮ࣜࢺቨࡢ㟁☢Ἴ㏱㐣࣭ᑕᦆኻ㛵ࡍࡿᩘ್ゎᯒ᪉ἲࡢ◊✲͇, ᪥ᮏᘓ⠏Ꮫ Ꮫ⾡ㅮ₇᱾ᴫ㞟(ᮾᾏ), pp.539-540, 2012.
EVALUATION OF EM-WAVE TRANSMISSION CHARACTERISTICS UTILIZING ANECHOIC
CHAMBER 㸫COMPARING EXPERIMENTAL MEASUREMENT WITH SIMULATED RESULTS
BY FINITE ELEMENT METHOD FOR REINFORCED CONCRETE WALL㸫
T.Watanabe and T.Kawase
In this report, the evaluation method of EM-wave transmission characteristics of construction materials in EMC(Electro-Magnetic Compatibility) laboratory newly constructed in Institute of Technology, Tokyu Construction Co., Ltd., is introduced. Moreover examples of simulations and measurement of reinforced concrete are presented. The laboratory is designed as laying on the aperture between the two anechoic chambers, and EM-wave transmission characteristics can be evaluated using the aperture. At first, the affections on EM-wave transmission characteristic due to reflected waves from a wall surrounding the aperture were simulated. Next, the sample of reinforced concrete was measured and compared with the result calculated by FEM(Finite Element Method) to demonstrate validity of the measurement method and the environment of measurement. As a result, the difference between the measurement and the calculation was about up to 5dB.
東急建設技術研究所報No.39
