Beat characteristics and beat maps of the King Seong-deok Divine Bell

Kim, Seock-Hyun; Lee, Chi-Wook; Lee, Jang-Moo

doi:10.1016/j.jsv.2004.01.038

Cited by 19 publications

(15 citation statements)

References 14 publications

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“…By the impulse response analysis, the beat response of each ( ) , m n mode in a slightly asymmetric cylindrical shell is given by [4] …”

Section: Extracting the Beat Characteristics And Damping Ratios Of Bementioning

confidence: 99%

“…In the conventional method, the low and high mode consisting of the mode pair were individually excited, and then the mode shape, beat frequency and modal damping were individually extracted by the measured signal. Also, when the measured signal includes the components of the low and high mode of a certain mode pair, the modal properties of the bell are measured through the filtering method [4]. In this case, it is very difficult to individually excite the two modes with the very close natural frequency.…”

Section: Introductionmentioning

confidence: 99%

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Identification of the beat characteristics and damping ratios of the Hwacheon World Peace Bell using wavelet transform

et al. 2009

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In this paper, a new measurement technique is proposed to identify the beat characteristics and modal damping ratios of a Korean bell in the casting field. The beat response caused by the mutual interference of mode pair with very close doublet frequency is unique feature of the Korean bell and should be accurately measured in order to quantitatively estimate the bell sound. However, the conventional method based on a filtering concept such as the Fourier transform has difficulty in extracting the beat frequencies and modal damping ratios because the method should individually decompose the measured signal into each mode. The aim of this paper is to propose an effective measurement method to identify the beat frequencies, mode pairs and modal damping ratios using the continuous wavelet transform in a real striking condition. The proposed method is verified with the Hwacheon World Peace Bell cast in the year 2008, which is the largest bell in Korea. In the future, the proposed method can be applicable to the casting field of the Korean bell to effectively estimate its beat characteristics and damping characteristics.

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“…By the impulse response analysis, the beat response of each ( ) , m n mode in a slightly asymmetric cylindrical shell is given by [4] …”

Section: Extracting the Beat Characteristics And Damping Ratios Of Bementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of the beat characteristics and damping ratios of the Hwacheon World Peace Bell using wavelet transform

et al. 2009

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“…In other words, the equivalent model with a point mass follows only a target mode in the mode characteristics. Table 1 shows the specifications ofthe circular ring, which are determined to have the same frequency of the n=2 mode as that of the famous King Seongdeok Divine Bell (Kim et al, 2005). With the symmetric ring, we generate asymmetry using five point masses; mj=[3, 1,4,6, 4]kg, cI>i= [O, 35, 125,260, 300r.…”

Section: =0mentioning

confidence: 99%

“…The clarity of the beat can be analyzed by the following impulse response model of a slightly asymmetric circular ring. (Kim et al, 2005) node position and fmd an effective method for the structure modification in order to satisfy the required mode characteristics from a simple equivalent model. This equivalent model can be applied to obtain the alteration of the mode characteristics for higher modes as well(n=3, 4,... ).…”

Section: Analysis Of the Equivalent Ring Modelmentioning

confidence: 99%

“…Hong and Lee analyzed an asymmetric circular ring and then obtained a precise solution considering the local mass and stiffness deviations as a heavy side step function (Hong and Lee, 1994). On the other hand, Kim et al have investigated the beat distribution characteristics by using the impulse response model of a light asymmetric ring (Kim et al, 2005 ;Lee et al, 2002). There are many researches theoretically analyzing the mode characteristics of an asymmetric circular ring; however, there are very few researches on creating an equivalent circular ring, which has the required mode characteristics and vice versa.…”

Section: Introductionmentioning

confidence: 99%

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Analytical method of beat tuning in a slightly asymmetric ring

2007

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In this research, we propose an analytical method to control the period and the clarity of the beat in a slightly asymmetric ring. The concept of a simple equivalent ring is applied, i.e. a slightly asymmetric ring with known modal data is modeled as an equivalent circular ring with one or multiple point masses, which has the same modal data as that of the original ring. By using the equivalent ring model, the optimal beat tuning is achieved by adding a 2 nd point mass in order to obtain the required period and clarity in the beating vibration. The results obtained from the analytical method are compared with those obtained from finite element analysis(FEA) and the validity of the proposed method is verified. The proposed method can be effectively used to predict the mode pair and control the beat property in belltype structures.

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