Zeitschriftenartikel zum Thema „Side-branch resonator“

This paper describes an analytical and experimental investigation to enhance combustion system operability using side branch resonators. First, a simplified model of the combustion system dynamics is developed in which the large amplitude pressure oscillations encountered at the operability limit are viewed as limit cycle oscillations of an initially linear instability. Under this assumption, increasing the damping of the small amplitude combustion system dynamics will increase combustor operability. The model is then modified to include side branch resonators. The parameters describing the side branch resonators and their coupling to the combustion system are identified, and their influence on system stability is examined. The parameters of the side branch resonator are optimized to maximize damping augmentation and frequency robustness. Secondly, the model parameters for the combustor and side branch resonator dynamics are identified from experimental data. The analytical model predicts the observed trends in combustor operability as a function of the resonator parameters and is shown to be a useful guide in developing resonators to improve the operability of combustion systems. [S0742-4795(00)00602-5]

Helmholtz resonators are widely used, but classical models for the resonators, such as the lumped-element equivalent circuit, are inaccurate for most geometries. This article presents higher-order equivalent circuits for describing the resonators based on the one-dimensional wave equation. Impedance expressions are also derived. These circuits and expressions are given for various constituent resonator components, which may be combined to model resonators with curved, tapered, and straight necks. Resonance frequency predictions using this theory are demonstrated on two realistic resonators. The higher-order predictions are also applied to the theory of side branch attenuators in a duct and the theory of resonator coupling with a mode of an enclosure.

As a typical noise-attenuating device, Helmholtz resonators are widely implemented in aero-engines and gas turbines to decrease the transmission of acoustic noise. However, an asymmetric Helmholtz resonator could be designed and implemented due to the limited space available in the engines. To examine and optimize the noise-attenuating performances of the asymmetric resonator, comparison studies are performed. For this, a two-dimensional frequency-domain model of a cylindrical duct with a grazing flow is developed. An asymmetric Helmholtz resonator is attached as a side branch. The model containing the linearized Navier–Stokes equations is validated first by comparing the predicted results with the experimental ones available in the literature. Further validation is conducted by comparing the results of an asymmetric resonator with the analytical ones available in the literature. The effects of (1) neck offset distance from the center of the resonator cavity denoted by [Formula: see text] and (2) the grazing flow Mach number [Formula: see text] are evaluated. It is shown that as the grazing flow Mach number is increased, the resonant frequencies and the maximum transmission losses are dramatically varied for a given [Formula: see text]. As [Formula: see text] is increased from 0 to 0.5 and [Formula: see text], the resonant frequencies and the maximum transmission losses are increased. However, when [Formula: see text] is lower than 0.07, i.e. [Formula: see text], the transmission loss performances are almost unchanged with [Formula: see text] increased. The optimum design of the asymmetric resonator is shown to give rise to the resonant frequency being shifted by 10% and 2–5 dB more transmission loss at higher Mach number. Finally, visualization of vortex shedding formed at the neck of the asymmetric resonator confirms that acoustical energy is transformed into kinetic energy and absorbed by the surrounding air. This study opens up a numerical design approach to optimize an asymmetric resonator.

We used pipe models to investigate the effects of paranasal sinus ostium size and paranasal sinus volume on the area-distance curves derived by acoustic rhinometry (AR). Each model had a Helmholtz resonator or a short neck as a side branch that simulated the paranasal sinus and sinus ostium. The AR-derived cross-sectional areas posterior to the ostium were significantly overestimated. Sinus volume affected the AR measurements only when the sinus was connected via a relatively large ostium. The experimental area-distance curve posterior to the side branch showed pronounced oscillations in association with low-frequency acoustic resonances in this distal part of the pipe. The experimental results are discussed in terms of theoretically calculated “sound-power reflection coefficients” for the pipe models used. The results indicate that the effects of paranasal sinuses and low-frequency acoustic resonances in the posterior part of the nasal cavity are not accounted for in the current AR algorithms. AR does not provide reliable information about sinus ostium size, sinus volume, or cross-sectional area in the distal parts of nasal cavity.

As is generally known, discrete-frequency noises are radiated from fans due to rotor-stator interaction. Their fundamental frequency is the blade-passage frequency, which is determined by the number of rotor blades and their rotating speeds. To reduce such noises, several types of silencers have been designed. Among them, the authors noted a slitlike expansion chamber (hereafter referred to asslit, for simplicity) and have studied its performance. A slit is a simple expansion chamber with a very short axial length that is placed in a duct. A slit with a circular cross-section that is concentric with a circular duct may be studied using the same interpretation as is used for a side-branch resonator muffler (closed-end tube connected to a duct); that is, the resonant frequency of a slit depends on its depth (with an open-end correction). It is expected, hence, that a slit might be applicable as a simple and axially compact silencer that is effective on discrete-frequency noises. In this article, the properties of a slit are introduced, and the applicability of a slit to actual rotating machinery is described using experimental data.

A comprehensive study that compared acoustic rhinometry (AR) data to computed tomography (CT) data was performed to evaluate the accuracy of AR measurements in estimating nasal passage area and to assess its ability of quantifying paranasal sinus volume and ostium size in live humans. Twenty nasal passages of 10 healthy adults were examined by using AR and CT. Actual cross-sectional areas of the nasal cavity, sinus ostia sizes, and maxillary and frontal sinus volumes were determined from CT sections perpendicular to the curved acoustic axis of the nasal passage. Nasal cavity volume (from nostril to choana) calculated from the AR-derived area-distance curve was compared with that from the CT-derived area-distance curve. AR measurements were also done on pipe models that featured a side branch (Helmholtz resonator of constant volume but two different neck diameters) simulating a paranasal sinus. In the anterior nasal cavity, there was good agreement between the cross-sectional areas determined by AR and CT. However, posterior to the sinus ostia, AR overestimated cross-sectional area. The difference between AR nasal volume and CT nasal volume was much smaller than the combined volume of the maxillary and frontal sinuses. The results suggest that AR measurements of the healthy adult nasal cavity are reasonably accurate to the level of the paranasal sinus ostia. Beyond this point, AR overestimates cross-sectional area and provides no quantitative data for sinus volume or ostium size. The effects of paranasal sinuses and acoustic resonances in the nasal cavity are not accounted for in the present AR algorithms.

A novel dual-band/dual-mode compact hybrid coupler which acts as a dual-band branch-line coupler at the lower band and as a rat-race coupler at the higher band is presented in this paper. One of the most interesting features of the proposed structure is that outputs of the proposed coupler in each mode of operation are on the same side. This unique design is implemented using artificial transmission lines (ATLs) based on open split ring resonators (OSRR). The low-cost miniaturized coupler could be operated as a dual-band 90° branch-line coupler at 3.3 and 3.85 GHz and 180° rat-race coupler at 5.3 GHz. The proposed coupler could be utilized in the antenna array feeding circuit to form the antenna beam. The structure’s analytical circuit design based on its equivalent circuit model is provided and verified by measurement results.

Abstract Circumferential tire grooves form pipes in the contact patch and generate the nuisance noise, for which the fundamental natural frequency is approximately 1000 Hz for passenger car tires. The frequency coincides with the peak of pass-by noise spectrum. Therefore, controlling the groove resonance is of a main motivation of this paper to reduce environmental noise. If one lateral slot end is terminated in tread rib and if the other end merges to a circumferential groove, it is found that the slot performs as a side-branch or a Helmholtz subresonator to counteract to the pipe resonance. The slot parameters, such as cavity volume and the change in section area, determine the resonant frequency and effectively influence on the acoustic characteristics of whole groove space. Optimal slot geometry is widely investigated by using numerical analysis and validated by experiments. It is shown that the proposed tread design can significantly reduce groove noise without sacrificing other performances.

AbstractTransmission of acoustic waves through a two-dimensional composite material made of PVC cylinders surrounded by air is measured experimentally. The spectrum presents a very large absolute band gap in the audible frequency range. A waveguide created inside this phononic crystal by removing a row of cylinders can transmit very efficiently the waves falling inside the stop band. We show the existence of deaf modes in the band structure of the linear waveguide. Resonant filtering is also demonstrated experimentally by coupling the waveguide to a side branch resonator of variable length. Frequency filtering is observed in the form of narrow dips in the transmission spectrum of the waveguide. Most of these observations compare favorably with theoretical calculations of dispersion curves and transmission coefficients of model structures using the plane wave expansion and the finite difference time domain methods. Narrow dips similar to those of the guide with resonator are also observed in the transmission spectrum of a waveguide with a sharp bend.

Acoustic power generated by turbulent flow over a coaxial side branch (deep cavity) resonator mounted in a rectangular duct is calculated using a semiempirical approach. Instantaneous flow velocity is decomposed into an irrotational acoustic component and vorticity-bearing hydrodynamic field. The total velocity at several phases of the acoustic oscillation cycle is measured using digital particle image velocimetry. The acoustic velocity field is numerically calculated. The emphasis is on the effect of the accurate geometry representation for the acoustic field modeling on the calculated acoustic power. Despite the generally low levels of acoustic radiation from the coaxial side branches, when the main duct is incorporated into the model for calculation of the acoustic velocity, the acoustic velocity exhibits substantial horizontal (streamwise) components in the vicinity of the cavity corners. This streamwise acoustic velocity correlates with hydrodynamic horizontal velocity fluctuations, thus contributing to the calculated acoustic power. Spatial structure and strength of the acoustic source change as the distance between the side branches varies. Global quantitative imaging approach is used to characterize the transformation of the acoustic source structure in terms of patterns of instantaneous and phase-averaged flow velocity, vorticity, and streamline topology as well as time-averaged acoustic power.

The authors have done extensive research in gathering historical background on the subject of flow excited acoustic resonance. They have provided extensive discussion to justify creative formulations for predicting the onset of resonance and estimating the associated maximum pressure amplitudes. Their approach makes use of reported experimental studies plus some of their own to make charts that should be useful for some common industrial problems. An independent scaling approach is offered in this review to verify the dominant parameters and variables employed by the authors in their predictive methods. It was found that for low Mach number flows, a specific Reynolds number (Re) dependence was missing. However, since it is known that the Strouhal dependence is very weak on Reynolds numbers up to about 105, the absence of specific Re dependence is probably inconsequential. Another concern was that interaction between the acoustics and vortex shedding or shear layer instabilities could affect the eigenfrequencies. A simple model showed that this is possible, but Quad Cities experience cited by the authors indicated one case where it was not important. The Rolls-Royce Vertical Lift System example with coaxial closed side-branches could have had a significant interaction with the annular liquid mass on eigenmodes. The mass effect resulting from the annular space connecting both branches could act less like an oscillating shear layer and more like a Helmholtz resonator. This could have a significant effect on the natural frequency of either or both branch pipes. Although that effect is not specifically considered here, if it was significant, it would be naturally embraced in a scale model based on the scaling laws presented in this review.

Introduction In October 2007, the federal Coalition government legislated that all eligible migrants and refugees who want to become Australian citizens must sit and pass the newly designed Australian citizenship test. Prime Minister John Howard stated that by studying the essential knowledge on Australian culture, history and values that his government had defined in official citizenship test resources, migrants seeking the conferral of Australian citizenship would become "integrated" into the broader, "mainstream" community and attain a sense of belonging as new Australian citizens (qtd. in "Howard Defends Citizenship Test"). In this paper, I conduct a genealogical analysis of Becoming an Australian Citizen, the resource booklet that contains all of the information needed to prepare for the test. Focusing specifically on the section in the booklet entitled A Story of Australia which details Australian history and framing my research through a Foucauldian perspective on governmentality that focuses on the interrelationship with truth, power and knowledge in the production of subjectivities, I suggest that the inclusion of the subject of history in the test was constituted as a new order of knowledge that aimed to shape new citizens' understanding of what constituted the "correct" version of Australian identity. History was hence promoted as a form of knowledge that relied on objectivity in order to excavate the truths of Australia's past. These truths, it was claimed, had shaped the very values that the Australian people lived by and that now prospective citizens were expected to embrace. My objective is to problematise this claim that the discipline of history consists of objective truths and to move beyond recent debates in politics and historiography known as the history wars. I suggest that history instead should be viewed as a "curative science" (Foucault 90), that is, a transformative form of knowledge that focuses on the discontinuities as well as the continuities in Australia's past and which has the potential to "delimit truths" (Weeks) and thus heal the fatal impact of an official history dominated by notions of progress and achievements. This kind of cultural research not only has the capacity to influence policy-making in the field of civic education for migrant citizens, but it also has the potential to broaden understanding of Australia's past by drawing on alternative stories of Australia including the ruptures and counter stories that come together to form the multiplicity that is Australian identity. Values Eclipsing History The test was introduced at a time when the impact of globalisation was shifting conceptions of the conferral of citizenship in many Western nations from a notion of new citizens gaining legal and political rights to a concept through which becoming a naturalized citizen meant adopting a nation's particular way of life and embracing a set of core national values (Allison; Grattan; Johnson). In Australia, these values were defined as a set of principles based around liberal-democratic notions of freedom, equality, the rule of law and tolerance and promoted as "central to Australia remaining a stable, prosperous and peaceful community" (DIC 5). The Howard government believed that social cohesion was threatened by the differences emanating from recent arrivals, particularly non-Christian and non-white arrivals who did not share Australian values. These threats were contextualized through such incidents as asylum seekers allegedly throwing children overboard, the Cronulla Beach riots in 2005 and terrorist attacks close to home in Bali. Adopting Australian values was promoted as the solution to this crisis of difference. In this way, the Australian values promoted through the Australian citizenship test were allotted "a reforming role" whilst migrants and their differences were targeted as "objects of reform" (Bennett 105). Reform would be achieved by prospective citizens engaging freely in the ethical conduct of self-study of the history and values contained in the citizenship resource booklet. With some notable exceptions (see e.g. Lake and Tavan), inclusion of historical content in the test received less public scrutiny than Australian values. This is despite the fact that 37 per cent of the booklet's content was dedicated to Australian history compared to only 7 per cent dedicated to Australian values. This is also remarkable since previously, media and scholarly attention over the preceding two decades had agonised over how British colonisation and indigenous dispossession were to be represented in Australian public institutions. Popularly known as the history wars, these debates now seemed irrelevant for regulating the conduct of new citizens. The Year of the Apology: The End of the History Wars? There was also a burgeoning feeling among the broader community that a truce was in sight in the history wars (cf. Riley; Throsby). This view was supported by the outcome of the November 2007 federal election when the Howard government was defeated after eleven years in office. John Howard had been a key player in the history wars, intervening in decisions as wide ranging as the management of national museums and the preparation of high school history curricula. In his final year as prime minister, Howard became involved with overseeing what historical content was to be included in Becoming an Australian Citizen (cf. Andrews; Hirst). This had a lasting impact as even after Howard's electoral defeat, the Australian citizenship test and its accompanying resource booklet still remained in use for another two years as the essential guide that was to inform test candidates on how to be model Australian citizens. Whilst Howard's test was retained Kevin Rudd made the official Apology to the Stolen Generation as one of his first acts as prime minister in February 2008. His electoral victory was heralded as the coming of "a new intellectual culture" with "deep thinking and balanced analysis" (Nile). The Apology was also celebrated in both media and academic circles as the beginning of the process of reconciliation for both relations with indigenous and non-indigenous Australians as well as "reconciling" the controversies in history that had plagued Howard's prime ministership. In popular culture, too, the end of the history wars seemed imminent. In film, the Apology was celebrated with the release of Australia in November of that same year. Luhrmann's film became a box office hit that was later taken up by Tourism Australia to promote the nation as a desirable destination for international tourists. Langton praised it as an "eccentrically postmodern account of a recent frontier" that "has leaped over the ruins of the 'history wars' and given Australians a new past" and concluded that the film presented "an alternative history from the one John Howard and his followers constructed" (12). Similar appraisals had been made of the Australian citizenship test as the author of the historical content in the resource booklet, John Hirst, revealed that the final version of A Story of Australia "was not John Howard's and was organised contrary to his declared preference for narrative" (35). Hirst is a conservative historian who was employed by the Howard government to write "the official history of Australia" (28) for migrants and who had previously worked on other projects initiated by the Howard government, including the high school history curriculum review known as the History Summit in 2006. In an article entitled Australia: The Official History and published in The Monthly of that very same year as the Apology, Hirst divulged how in writing A Story of Australia for the citizenship resource booklet, his aim was to be "fair-minded and balanced" (31). He claimed to do this by detailing what he understood as the "two sides" in Australia's historical and political controversies relating to "Aboriginal affairs" (31), known more commonly as the history wars. Hirst's resolve was to "report the position of the two sides" (31), choosing to briefly focus on the views of historian Henry Reynolds and the political scientist Robert Manne on the one side, as well as presenting the conservative views of journalists Keith Windshuttle and Andrew Bolt on the other side (31-32). Hirst was undoubtedly referring to the two sides in the history wars that are characterised by on the one hand, commentators who believe that the brutal impact of British colonisation on indigenous peoples should be acknowledged whilst those on the other who believe that Australians should focus on celebrating their nation's relatively "peaceful past". Popularly characterised as the black armband view against the white blindfold view of Australian history, this definition does not capture the complexities, ruptures and messiness of Australia's contested past or of the debates that surround it. Hirst's categorisation, is rather problematic; while Windshuttle and Bolt's association is somewhat understandable considering their shared support in denying the existence of the Stolen Generation and massacres of indigenous communities, the association of Reynolds with Manne is certainly contestable and can be viewed as a simplistic grouping together of the "bleeding hearts" in discourses surrounding Australian history. As with the film Australia, Hirst wanted to be "the recorder of myth and memory and not simply the critical historian" (32). Unlike the film Australia, Hirst remained committed to a particular view of the discipline of history that was committed to notions of objectivity and authenticity, stating that he "was not writing this history to embody (his) own views" (31) but rather, his purpose was to introduce to new citizens what he thought captured "what Australians of today knew and valued and celebrated in their history" (32). The textual analysis that follows will illustrate that despite the declaration of a "balanced" view of Australian history being produced for migrant consumption and the call for a truce in the history wars, A Story of Australia still reflected the values and principles of a celebratory white narrative that was not concerned with recognising any side of history that dealt with the fatal impact of colonialism in stories of Australia. Disrupting the Two Sides of History The success of Australia was built on lands taken from Aboriginal people after European settlement in 1788 (DIC 32). [...]The Aboriginal people were not without friends […]. Governor Macquarie (1810-1821) took a special interest in them, running a school for their children and offering them land for farming. But very few Aboriginal people were willing to move into European society; they were not very interested in what the Europeans had to offer. (DIC 32) Despite its author's protestations against a narrative format, A Story of Australia is written as a thematic narrative that is mainly concerned with describing a nation's trajectory towards progress. It includes the usual primary school project heroes of European explorers and settlers, all of them men: Captain James Cook, Arthur Phillip and Lachlan Macquarie (17-18). It privileges a British heritage and ignores the multicultural make-up of the Australian population. In this Australian story, the convict settlers are an important factor in nation building as they found "new opportunities in this strange colony" (18) and "the ordinary soldier, the digger is a national hero" (21). Indigenous peoples, on the other hand, are described in the past tense as part of pre-history having "hunter-gatherer traditions" (32), whose culture exists today only in spectacle and who have only themselves to blame for their marginalisation by refusing the help of the white settlers. Most notable in this particular version of history are the absent stories and absent characters; there is little mention of the achievements of women and nation-building is presented as an exclusively masculine enterprise. There is also scarce mention of the contribution of migrants. Also absent is any mention of the colonisation of the Australian continent that dispossessed its Indigenous peoples. For instance, the implementation of the assimilation policy that required the forcible removal of Aboriginal children from their families is not even named as the Stolen Generation in the resource booklet, and the fight for native land rights encapsulated in the historic Mabo decision of 1992 is referred to as merely a "separatist policy" (33). In this way, it cannot be claimed that this is a balanced portrayal of Australia's past even by Hirst's own standards for it is difficult to locate the side represented by Reynolds and Manne. Once again, comparisons with the film Australia are useful. Although praised for raising "many thorny issues" relating to "national legitimacy and Aboriginal sovereignty" (Konishi and Nugent), Ashenden concludes that the film is "a mix of muttering, avoidance of touchy topics, and sporadic outbursts". Hogan also argues that the film Australia is "an exercise in national wish fulfillment, staged as a high budget, unabashedly commercial and sporadically ironic spectacle" that "offers symbolic absolution for the violence of colonialism" (63). Additionally, Hirst's description of a "successful" nation being built on the "uncultivated" indigenous lands suggests that colonisation was necessary and unavoidable if Australia was to progress into a civilised nation. Both Hirst's A Story of Australia and his Australia: The Official History share more than just the audacious appropriation of a proper noun with the film Australia as these cultural texts grant prominence to the values and principles of a celebratory white narrative of Australian history while playing down the unpalatable episodes, making any prospective citizen who does not accept these "balanced" versions of historical truths as deviant and unworthy of becoming an Australian citizen. Our Australian Story: Reconciling the Fatal Impact The Australian citizenship test and its accompanying booklet, Becoming an Australian Citizen were replaced in October 2009 with a revised test and a new booklet entitled, Australian Citizenship: Our Common Bond. The Australian Citizenship Test Review Committee deemed the 2007 original test to be "flawed, intimidating to some and discriminatory" (Australian Citizenship Test Review Committee 3). It replaced mandatory knowledge of Australian values with that of the Citizenship Pledge and determined that the subject of Australian history, although "nice-to-know" was not essential for assessing the suitability of the conferral of Australian citizenship. History content is now included in the new booklet in the non-testable section under the more inclusive title of Our Australian Story. This particular version of history now names the Stolen Generation, includes references to Australia's multicultural make up and even recognises some of the fatal effects of British colonisation. The Apology features prominently over three long paragraphs (71) and Indigenous dispossession is now described under the title of Fatal Impact as follows: The early governors were told not to harm the Aboriginal people, but the British settlers moved onto Aboriginal land and many Aboriginal people were killed. Settlers were usually not punished for committing these crimes. (58) So does this change in tone in the official history in the resource booklet for prospective citizens "prove" that the history wars are over? This more conciliatory version of Australia's past is still not the "real proof" that the history wars are over for despite broadening its categories of what constitutes as historical truth, these truths still privilege an exclusive white perspective. For example, in the new resource booklet, detail on the Stolen Generation is included as a relevant historical event in relation to what the office of Prime Minister, the Bringing Them Home Report and the Official Apology have achieved for Indigenous Australians and for the national identity, stating that "the Sorry speech was an important step forward for all Australians" (71). Perhaps then, we need to discard this way of thinking that frames the past as an ethical struggle between right and wrong and a moral battle between victors and losers. If we cease thinking of our nation's history as a battleground between celebrators and mourners and stop framing our national identity in terms of achievers and those who were not interested in building the nation, then we recognise that these "war" discourses are only the products of "games of truth" invented by governments, expert historians and their institutions. In this way, official texts can produce the possibility for a range of players from new directions to participate in what content can be included as historical truths in Australian stories and what is possible in productions of official Australian identities. The Australian Citizenship Review Committee understood this potential impact as it has recommended "the government commit to reviewing the content of the book at regular intervals given the evolving nature of Australian society" (Australian Citizenship Test Review Committee 25). In disrupting the self-evident notion of a balanced history of facts with its evocation of an equal society and by exposing how governmental institutions have used these texts as instruments of social governance (cf. Bennett), we can come to understand that there are other ways of being Australian and alternative perspectives on Australian history. The production of official histories can work towards producing a "curative science" that heals the fatal impact of the past. The impact of this kind of cultural research should be directed towards the discourse of history wars. In this way, history becomes not a battlefield but "a differential knowledge of energies and failings, heights and degenerations, poisons and antidotes" (Foucault 90) which has the capacity to transform Australian society into a society inclusive of all indigenous, non-indigenous and migrant citizens and which can work towards reconciliation of the nation's history, and perhaps, even of its people. References Allison, Lyn. "Citizenship Test Is the New Aussie Cringe." The Drum. ABC News. 4 Dec. 2011 ‹http://www.abc.net.au/news/2007-09-28/citizenship-test-is-the-new-aussie-cringe/683634›. Andrews, Kevin. "Citizenship Test Resource Released." MediaNet Press Release Wire 26 Aug. 2007: 1. Ashenden, Dean. "Luhrmann, Us, and Them." 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