CN100398788C - 用于具有内燃机的汽车的消声器 - Google Patents

用于具有内燃机的汽车的消声器 Download PDF

Info

Publication number
CN100398788C
CN100398788C CNB2005100045535A CN200510004553A CN100398788C CN 100398788 C CN100398788 C CN 100398788C CN B2005100045535 A CNB2005100045535 A CN B2005100045535A CN 200510004553 A CN200510004553 A CN 200510004553A CN 100398788 C CN100398788 C CN 100398788C
Authority
CN
China
Prior art keywords
silencing apparatus
depression
shell
described shell
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB2005100045535A
Other languages
English (en)
Other versions
CN1641190A (zh
Inventor
J·布兰德
K·施勒尔
P·加西亚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tenneco GmbH
Original Assignee
Heinrich Gillet GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heinrich Gillet GmbH filed Critical Heinrich Gillet GmbH
Publication of CN1641190A publication Critical patent/CN1641190A/zh
Application granted granted Critical
Publication of CN100398788C publication Critical patent/CN100398788C/zh
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

本发明的主题是一种消声器，其外壳(1)配有无规律设置的、借助于一个有限元计算机程序计算的凹陷(4，5，6，7，8，9)。所述凹陷(4，5，6，7，8，9)是的规则地形成边缘的简单的几何图形——如圆、圆环(4)、圆环扇形段(5)、矩形(6，10)或梯形(7)。这样选择所述凹陷(4，5，6，7，10)的大小和位置，使所述外壳(1)的最低固有频率大于/等于内燃机在其整个转速范围上的主激振频率。

Description

用于具有内燃机的汽车的消声器
技术领域
本发明涉及一种用于具有内燃机的汽车的消声器，该消声器至少包括一个外壳、一个进气管、一个排气管和必要时的内壁和/或管，所述外壳配有无规律设置的、借助于FEM计算机程序计算的凹陷。
背景技术
在计算一个用于汽车的消声器的几何形状时，无论是进气消声器或后消声器，声学要求都必需与发动机空间或底盘下面的空间情况相协调。尤其是空间情况使消声器外壳具有椭圆至立方体扁平的横截面。为了防止外壳的大平面薄板件自由振动并无阻碍地辐射声音、尤其是低频声音，所述外壳薄板配有压痕。例如可以比较DE 197 46 553A，EP 0 324 891 A，BE 653 635 A，JP 49129034 A，JP 07259531 A或US 2,835,336。在这些文献中描述的外壳薄板的压痕基本上根据经验获得。由此尽管可以在一定程度上降低外壳表面的声辐射，但是结果不是最佳的。
在德国杂志“ATZ和MTZ”2003年10月增刊第39和40页描述了一个用于内燃机废气装置后消声器的地形最佳化，它在使用美国公司Altair Engineering销售的计算机程序“Optistruet”的条件下运行。这种基于有限元(FEM)方法的计算机程序能够使一个薄板表面自动地如此优化，使得最低的固有频率尽可能高。固有频率越高，主观和客观感觉到的噪声就越小。
所述计算机程序“Optistruct”根据给定的消声器外壳的形状和尺寸计算外壳表面上的压痕，该压痕导致尽可能高的固有频率。这样计算出来的在外壳表面上的压痕可以称为无规律地形成边缘的、无规律地定位的和不均匀深度的凹陷。
由于该凹陷与在一个奶牛皮上的斑记近似，所以这种凹陷图形也称为“奶牛斑记-图案”。也使用称谓“Kassel凹陷”。
通过这种计算机优化程序获得的凹陷图形的声学效果是非常突出的，但是为了实现该图形所必需的深拉模具是复杂且昂贵的，因为在加工无规律地形成边缘的和不均匀深度的凹模和凸模时不能使用简单的加工方法。这是令人不满意的。
发明内容
本发明的目的是，提供一种上述类型的消声器，该消声器的由外壳表面发出的声辐射最小，但是该消声器能够以明显简单且经济的模具进行制造。
这个目的的技术技术方案是一种用于具有内燃机的汽车的消声器，该消声器至少包括一个外壳、一个进气管和一个排气管，所述外壳配有无规律设置的、借助于一个有限元计算机程序计算的凹陷，其中，所述凹陷是规则地形成边缘的简单的几何图形，所述外壳的最低固有频率大于/等于内燃机在其整个转速范围上的主激振频率。
本发明基于的规定是，由外壳表面发出的声辐射借助于计算机优化程序实现最小化，但是其中所述凹陷图形局限于简单几何形状，该几何形状基本可以通过标准化的金属加工工艺车削和铣削制成。
这些图形最好是圆和圆环以及圆扇形段和圆环扇形段，也包括多角形、尤其是矩形。它们由计算机优化程序这样设计尺寸和定位，使得在内燃机的整个旋转范围上的最低固有频率尽可能远地位于发动机的主要激振频率以上，由此使外壳表面的声辐射最小。
按照本发明的消声器与具有所谓奶牛斑记-设计的消声器相比令人惊奇的是，几乎不能测量出声学差。但是加工成本具有明显的差别。
按照本发明的一个优选的改进方案所述凹陷可以相互贯穿。
已经令人惊奇地证实，所述凹陷也可以设计成任意字符集的文字-拉丁文、阿拉伯文、中文、日文等文字、埃及的图形文字等。数字和特殊符号也证明是有利的。但是这些标记不能替换通常涂覆的序列数字、加工标记等。这些标记不是无规律地设置的。
也可以使凹陷连续地定位。
按照本发明的解决方案的另一特征是，所述外壳可以只由一层薄板制成。通常的消声器使用复合薄板，以便通过薄板之间的摩擦降低固体声辐射。
同样已经令人惊奇地证实，所述薄板的壁厚可以明显地降低，更确切地说降至直到0.7mm，而不会使固体声辐射不允许地升高。在此，不管所述外壳由两个半壳组成还是由一个薄板卷成都是无关紧要的。
附图说明
借助于附图详细描述本发明的一个实施例。附图中：
图1示出一个以最小声辐射优化的第一消声器，
图2示出一个优化的消声器的前后比较的测量值，
图3示出一个以最小声辐射优化的第二消声器，
图4示出一个以最小声辐射优化的第三消声器。
具体实施方式
图1示出一个用于具有内燃机的汽车的第一消声器。外壳1具有一个特别扁平的立方形横截面。废气通过一个进气管2进入到外壳1中，并通过一个排气管3离开外壳。在外壳1的内部中如公知的那样设有内壁和内管，其位置和刚度影响到外壳1的固有频率。
为了降低由于或大或小弯曲的薄板表面产生的外壳表面的高声辐射，在外壳表面中压入一个优化的凹陷图形。所述凹陷图形由规则地形成边缘的简单的几何图形组成。可以看到圆环4、圆环扇形段5、矩形6和梯形7。两个矩形的凹陷6局部地相互贯穿，由此产生一个T形图形。
图2前后比较地示出声音优化措施的结果。优化的曲线(虚线)位于起始曲线(连续线)以下直达10db。
图3示出一个由于将固有频率推移到较高的值而优化到最小的声辐射的消声器。作为凹陷仅存在相同大小的圆8，由此使深拉模具或压制模具特别简单。平行的矩形凹陷9的目的是使分隔壁固定在外壳1的内部中。
图4示出一个优化到最小声辐射的消声器的的第三实施例。所述凹陷图形由一个字符集的“字母”和“数字”组成，一个FEM计算机程序这样无规律地定位该字符集，使最低的固有频率位于内燃机的主激振频率以上。

Claims (14)

1.用于具有内燃机的汽车的消声器，该消声器至少包括
-一个外壳(1)、
-一个进气管(2)、
-一个排气管(3)，
-所述外壳(1)配有无规律设置的、借助于一个有限元计算机程序计算的凹陷(4，5，6，7，8，9，10)，
其特征在于，
-所述凹陷(4，5，6，7，8，9，10)是规则地形成边缘的简单的几何图形，
-所述外壳(1)的最低固有频率大于/等于内燃机在其整个转速范围上的主激振频率。
2.如权利要求1所述的消声器，其特征在于，所述凹陷(4，5，6，7，8，9，10)一致地凹下。
3.如权利要求1或2所述的消声器，其特征在于，所述凹陷由圆(8)、圆扇形段、圆环(4)和/或圆环扇形段(5)构成。
4.如权利要求1或2所述的消声器，其特征在于，所述凹陷由矩形(6，9)构成。
5.如权利要求1或2所述的消声器，其特征在于，所述凹陷由任意字符集的文字标记(10)构成。
6.如权利要求1或2所述的消声器，其特征在于，两个或多个凹陷(4，5，6，7，8，9，10)互相贯穿。
7.如权利要求1或2所述的消声器，其特征在于，两个或多个凹陷(4，5，6，7，8，9，10)连续地布置。
8.如权利要求1所述的消声器，其特征在于，所述凹陷(4，5，6，7，8，9，10)至少局部凸起地构成。
9.如权利要求1所述的消声器，其特征在于，所述外壳(1)的壁是单层的。
10.如权利要求9所述的消声器，其特征在于，所述外壳(1)的壁具有一个小于1mm的厚度。
11.如权利要求1所述的消声器，其特征在于，所述外壳(1)的壁由两个半壳组成。
12.如权利要求1所述的消声器，其特征在于，所述外壳(1)的壁由一个薄板卷成。
13.如权利要求4所述的消声器，其特征在于，平行的矩形凹陷(9)构成一个用于一个中间壁的固定体，所述外壳(1)具有内壁和/或管。
14.如权利要求1或2所述的消声器，其特征在于，所述凹陷由多角形构成。
CNB2005100045535A 2004-01-17 2005-01-17 用于具有内燃机的汽车的消声器 Expired - Fee Related CN100398788C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202004000659.6 2004-01-17
DE202004000659U DE202004000659U1 (de) 2004-01-17 2004-01-17 Schalldämpfer für Kraftfahrzeuge mit Verbrennungsmotor

Publications (2)

Publication Number Publication Date
CN1641190A CN1641190A (zh) 2005-07-20
CN100398788C true CN100398788C (zh) 2008-07-02

Family

ID=32115810

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2005100045535A Expired - Fee Related CN100398788C (zh) 2004-01-17 2005-01-17 用于具有内燃机的汽车的消声器

Country Status (5)

Country Link
US (1) US20050155817A1 (zh)
JP (1) JP2005201269A (zh)
KR (1) KR100697796B1 (zh)
CN (1) CN100398788C (zh)
DE (2) DE202004000659U1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112007001212A5 (de) * 2006-05-24 2009-03-12 Emcon Technologies Germany (Augsburg) Gmbh Gehäuse für eine Komponente einer Abgasanlage und eine solche Komponente
FR2917122B1 (fr) * 2007-06-08 2009-09-04 Faurecia Sys Echappement Silencieux pour ligne d'echappement de vehicule automobile
KR101499212B1 (ko) * 2009-11-16 2015-03-05 현대자동차주식회사 자동차 소음기의 엔드 플레이트 구조
DE102010020826B4 (de) * 2010-05-18 2013-06-06 Tenneco Gmbh Abgasschalldämpfer für Brennkraftmaschinen und Tiefziehwerkzeug hierfür sowie Verfahren zur Herstellung eines solchen Schalldämpfers
CN113700538A (zh) * 2021-07-28 2021-11-26 东风汽车集团股份有限公司 一种装饰尾管及汽车排气尾管

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4700806A (en) * 1986-11-25 1987-10-20 Ap Industries, Inc. Stamp formed muffler
US4821840A (en) * 1988-01-20 1989-04-18 Ap Parts Manufacturing Company Stamp formed exhaust muffler with conformal outer shell
JPH07259531A (ja) * 1994-03-28 1995-10-09 Calsonic Corp 消音器
US6135237A (en) * 1998-04-03 2000-10-24 Arvin Industries, Inc. Stamp-formed muffler
US20030101030A1 (en) * 2001-11-29 2003-05-29 Faurecia Exhaust Systems, Inc. Optimal rib design method for exhaust components

Family Cites Families (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2315305A (en) * 1941-05-07 1943-03-30 Harold E Van Voorhees Muffler
US2484827A (en) * 1946-10-17 1949-10-18 Bertron G Harley Baffle type muffler with corrugated casing
US2661073A (en) * 1950-08-09 1953-12-01 Oldberg Mfg Company Silencer or muffler
US2835336A (en) * 1953-07-15 1958-05-20 Oldberg Mfg Company Silencer or muffler
US3103256A (en) * 1959-11-09 1963-09-10 Oldberg Mfg Company Silencer or muffler
US3009530A (en) * 1960-01-21 1961-11-21 Laco Oil Burner Co Inc Exhaust device
US3220508A (en) * 1961-10-11 1965-11-30 Gen Motors Corp Muffler with interlocked casing and baffle members
US3106984A (en) * 1962-01-09 1963-10-15 Laclede Metal Products Co Muffler construction
US3227659A (en) * 1962-06-28 1966-01-04 Texaco Inc Treatment of exhaust gases using an alumina base alkali metal phosphorus-containing compound
US3638756A (en) * 1969-12-30 1972-02-01 United States Steel Corp Vehicle muffler and method of assembly
US4084658A (en) * 1976-11-05 1978-04-18 Custom-Bilt Tunable expansion chamber for internal combustion engines
US4239733A (en) * 1979-04-16 1980-12-16 General Motors Corporation Catalytic converter having a monolith with support and seal means therefor
US4269807A (en) * 1979-10-22 1981-05-26 Uop Inc. Catalytic converter mounting arrangement for reducing bypass leakage
DE3024630C2 (de) * 1980-06-30 1984-06-14 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Gehäuseteil an Verbrennungskraftmaschinen wie Ölwanne o.dgl.
US4433542A (en) * 1982-07-22 1984-02-28 Nissan Motor Company, Limited Heat-shielding structure
US4559205A (en) * 1983-02-28 1985-12-17 General Motors Corporation Catalytic converter substrate and retainer assembly
US4536371A (en) * 1983-05-16 1985-08-20 Arvin Industries, Inc. Catalytic converter divider
DE3440701A1 (de) * 1984-11-07 1986-05-22 Dr. Alois Stankiewicz GmbH, 3101 Adelheidsdorf Trennwand zur abtrennung des motorraums vom fahrgastraum eines kraftfahrzeugs
US4751979A (en) * 1985-05-16 1988-06-21 Airborne Express, Inc. Engine noise suppression kit for the nacelles of a jet aircraft
DE3826707A1 (de) * 1988-08-05 1990-02-08 Gruenzweig & Hartmann Verfahren zum herstellen eines abgas-schalldaempfers
US4894987A (en) * 1988-08-19 1990-01-23 Ap Parts Manufacturing Company Stamp formed muffler and catalytic converter assembly
US5119551A (en) * 1989-02-06 1992-06-09 Tennessee Gas Pipeline Company Method of making a catalytic converter with one piece housing
US5055274A (en) * 1989-02-06 1991-10-08 Tennessee Gas Pipeline Company Catalytic converter and substrate support with one piece housing
US4941545A (en) * 1989-04-28 1990-07-17 Arvin Industries, Inc. Muffler assembly
JPH0696974B2 (ja) * 1989-12-19 1994-11-30 株式会社共立 マフラーカバー
US5187334A (en) * 1990-07-02 1993-02-16 Tennessee Gas Pipeline Company Acoustic muffler with one-piece housing
US5173577A (en) * 1990-09-04 1992-12-22 Ap Parts Manufacturing Co. Stamp formed muffler with low back pressure
US5164551A (en) * 1990-12-03 1992-11-17 Ap Parts Manufacturing Co. Stamp formed muffler with compound reinforcement pattern for preventing shell ring
US5241512A (en) * 1991-04-25 1993-08-31 Hutchinson 2 Acoustic protection material and apparatus including such material
US5229557A (en) * 1991-05-28 1993-07-20 Arvin Industries, Inc. Rigidified muffler assembly
US5211013A (en) * 1991-09-17 1993-05-18 Tecumseh Products Company Muffler heat shield and method of attachment
US5280142A (en) * 1991-10-18 1994-01-18 Ap Parts Manufacturing Company Heat shielded exhaust system component
JP2578330Y2 (ja) * 1992-02-10 1998-08-13 株式会社共立 内燃機関の排気マフラー構造
US5252788A (en) * 1992-04-10 1993-10-12 Ap Parts Manufacturing Co. Stamp formed muffler with in-line expansion chamber and arcuately formed effective flow tubes
FR2693754B1 (fr) * 1992-07-16 1994-09-02 Saint Gobain Vitrage Int Caisson isolant acoustique.
US5281778A (en) * 1993-06-28 1994-01-25 Midas International Corporation Vehicular muffler with heat shield
CH691459A5 (de) * 1996-05-13 2001-07-31 Scambia Ind Dev Ag Abgasanlage für ein Kraftfahrzeug und Kraftfahrzeug.
US5859394A (en) * 1997-06-12 1999-01-12 Ap Parts Manufacturing Company Muffler with stamped internal plates defining tubes and separating chambers
US5949035A (en) * 1997-03-24 1999-09-07 Arvin Industries, Inc. Stamp-formed muffler having a unitary inner cartridge
KR19990003207A (ko) * 1997-06-25 1999-01-15 구자홍 저저항용 반사방지 음극선관 제조방법
US6257367B1 (en) * 1998-03-05 2001-07-10 Arvinmeritor, Inc. Stamp-formed muffler
US5945642A (en) * 1998-03-13 1999-08-31 Minnesota Mining And Manufacturing Company Acoustic horn
WO2000052312A1 (en) * 1999-03-05 2000-09-08 Arvinmeritor, Inc. Multi-chambered muffler
DE10020373A1 (de) * 2000-04-26 2001-10-31 Stihl Maschf Andreas Abgasschalldämpfer mit Funkenschutzsieb
US6454047B1 (en) * 2000-10-17 2002-09-24 Bbnt Solutions Llc System and method for phases noise attenuation
DE10106559A1 (de) * 2001-02-13 2002-08-29 Eberspaecher J Gmbh & Co Abgas-Gehäuseteil eines Kraftfahrzeuges
US6708626B2 (en) * 2001-06-11 2004-03-23 Kobe Steel, Ltd. Double-walled damping structure
US6892855B2 (en) * 2003-02-25 2005-05-17 Tenneco Automotive Operating Company Inc. Embossed shell for spun mufflers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4700806A (en) * 1986-11-25 1987-10-20 Ap Industries, Inc. Stamp formed muffler
US4821840A (en) * 1988-01-20 1989-04-18 Ap Parts Manufacturing Company Stamp formed exhaust muffler with conformal outer shell
JPH07259531A (ja) * 1994-03-28 1995-10-09 Calsonic Corp 消音器
US6135237A (en) * 1998-04-03 2000-10-24 Arvin Industries, Inc. Stamp-formed muffler
US20030101030A1 (en) * 2001-11-29 2003-05-29 Faurecia Exhaust Systems, Inc. Optimal rib design method for exhaust components

Also Published As

Publication number Publication date
KR100697796B1 (ko) 2007-03-20
KR20050075730A (ko) 2005-07-21
US20050155817A1 (en) 2005-07-21
DE202004000659U1 (de) 2004-04-15
CN1641190A (zh) 2005-07-20
DE102005000992A1 (de) 2005-08-04
JP2005201269A (ja) 2005-07-28

Similar Documents

Publication Publication Date Title
CN100398788C (zh) 用于具有内燃机的汽车的消声器
Wu et al. Modeling and experimental verification of a new muffler based on the theory of quarter-wavelength tube and the Helmholtz muffler
CN102900505B (zh) 用于车辆的排气尾管组件
Mao et al. Experimental validation of sound quality simulation and optimization of a four-cylinder diesel engine
CN112199775A (zh) 汽车进气系统降噪方法、装置、设备及存储介质
Wei et al. A hybrid numerical-experimental analysis for tire air-pumping noise with application to pattern optimization
CN100366868C (zh) 消声器
CN2869336Y (zh) 一种内燃机排气管消声器
Krüger et al. The effects of future noise limit values on the design of exhaust systems
JP2010223043A (ja) 省エネ型排気マフラー用スパイラルテール及びスパイラルテールの使用方法
CN207647855U (zh) 小型风机共振腔降噪装置
Kraft The Reduction of Air-Rush Noise in Plastic Engine Intake Manifolds
CN204827726U (zh) 汽车及用于汽车的空气滤清器
Brand et al. Surface radiated noise of exhaust systems-calculation and optimization with CAE
Dhatkar et al. Exhaust Noise Optimization for a Single Cylinder Engine by 1D-3D CFD Coupled Simulation Approach
Hueser et al. Sound quality and engine performance development utilizing air-to-air simulation and interior noise synthesis
Dixit et al. Optimization Methodology for Flow & Acoustics Performance of Air Induction System
Nghiem et al. Improvement of Engine Sound Radiation for the New Pass-By Noise Regulation
Brand et al. Thin wall exhaust systems
Masovic et al. A simple model of the far-field directivity of an open circular pipe with a hot flow
Marra Behind the rumble and roar of Mahindra motorcycles
Garcia et al. Surface radiated noise of exhaust systems
Gimelli et al. An Acoustic Design Procedure for Intake Systems: 1 d Analysis and Experimental Validation
Wenzel Acoustic design for charged engines
CN116933579A (zh) 一种基于nas-sv-mem的多源信息联合声辐射识别方法

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20080702

Termination date: 20110117