The prospect of the new railway construction has led to resistance from residents, partly based on noise and vibration issues. Particularly, as tracks often pass closely to residential dwellings, constructors are then required to take account of noise and vibration. So the prediction of noise and vibration for train is very important thing. The train noise and vibration nearby the elevated railway make one specific issue. For the elevated railway, this paper concerns the rolling noise by the wheel/rail and the structure-borne noise by the bridge. Based on the results, this paper proposes the source model of elevated structure-borne noise and the calculation model for elevated railway noise. Also prediction model is presented with rolling noise and elevated structure noise which are calculated by considering the power level of a source for one-third octave band, ground absorption and barrier deflection. A lot of empirical data is needed to predict the noise and vibration. And one of the best ways to control the wayside noise is to analyze the noise level.

철도소음은 도시지역의 철도건설과 유지에 가장 큰 장애 요소 중 하나이므로 보다 효과적으로 철도소음을 저감하기 위한 연구가 활발히 진행되고 있다. 방음터널은 철도소음을 저감할 수 있는 가장 효과적인 방법 중 하나이나, 하절기 높은 내부 온도 증가로 인하여 궤도좌굴 또는 전력, 신호 등 선로 설비의 안정성을 저하시킬 우려가 있다. 이러한 온도 상승 문제는 통기 형 방음판을 이용하여 해결할 수 있으나, 방음터널 적용 시의 소음저감 성능에 대한 연구는 미흡한 상황이다. 이 논문에서는 수치해석을 통하여 통기형 슬릿방음판의 효과적인 방음터널 적용 방법에 대한 연구 결과를 제시하였다. 수치해석은 음향해석 프로그램인 Pachyderm Acoustics으로 모델링한 복선 방음터널을 이용하여 수행하였다. 철도소음은 기존 연구결과를 이용하여 모사하였으며, 슬릿방음판의 적용 위치가 다른 6가지 경우에 대하여 소음저감 효과 변화를 검토하였다. 음향해석 결과 20% 정도 의 슬릿방음판 적용 시에도 철도소음을 최소 5dB 감소할 수 있는 것으로 나타났다.

The source of wayside noise for the train are the aerodynamic noise, wheel/rail noise, and power unit noise. The major source of railway noise is the wheel/rail noise caused by the interaction between the wheels and rails. The Structure borne noise is mainly a low frequency problem. The train noise and vibration nearby the elevated railway make one specific issue. The microphone array method is used to search sound radiation characteristics of elevated structure to predict the noise propagation from an elevated railway. In this paper, the train noise and structure borne noise by train are measured and prediction. From the results, we investigated the effect for elevated railway noise.

In this paper, interior noise that is brought into inside of coach when it passes by straight line track, railway turnout section, curved track, and rail lubricator section with test coach was measured in accordance of track characteristic of urban railway vehicle. It was evaluated with 60km/h of constant speed in the motorized trailer, no.3 car T1 motorized trailer of urban railway vehicle. Interior noise characteristic value is higher in order of curve, rail lubricator, railway turnout, and straight track as a result of the test. The highest characteristic value is 86.7dB in the curved track. And, the lowest characteristics value is 75.5dB(A) in the straight track. For accurate result comparison, it is transformed into sound pressure distribution by time domain, sound pressure level by time domain, sound pressure level for frequency domain and completed analysis.

This Paper deals with the measurement and analysis of the brake squeal noise, the wheel’s and block brake’s vibration. The squeal noise, a kind of self-excited vibration, is generated by the friction between the rim of the revolving wheel and the block brake. Block brake cause friction noise and excessive braking noise makes passengers and operators uncomfortable. The goal of this paper is to investigate experimental the relation between brake squeal noise and behavior of block brake with railway wheel. Experimental results with MA and RMA show that behavior of railway vehicle block brakes is related with brake squeal noise.

Railway noise is one of the main causes of environment impact. Whenever a new railway line is planned or a housing project near an existing railway is proposed, an estimate of the relevant noise levels is usually required. For this, it is necessary to quantify those parameters that affect the railway noise. Therefore we investigated the noise level which subway trains generated passing through the block of test railway track between Hopo and Keumgok station in Busan. This paper shows the status and characteristics of the subway train noise and a subjective evaluation.

In the case of railway bridges passing through the urban area, bridge type with excellent noise reduction performance is required. The bridges under development are steel composite through bridges, which is a composite structure of upper flanges with concrete, and the section bridges themselves, which surround the train, have the feature of acting as a sound barrier. In this paper, the performance test of air conduction noise is performed by the 20m full scale model test of new type steel composite through bridge.

Railway bridges through the downtown region is an excellent bridge type noise reduction performance is required. According to this request, the bridge of the noise barrier installation is not required and low vibration is under development. This railway bridge is PSC U-Type lower route railway bridge with sound absorbing system. Because the bridge cross-section wraps a train and web contains the sound-absorbing system, noise is reduced. In this study, we analyzed the noise reduction performance of PSC U-Type lower route railway bridge with sound absorbing system using general noise analysis program.

최근 철도에서 주거지역, 상가와 같은 외부로 전달되는 소음으로 인한 피해를 줄이기 위해, 일반적으로 도로변에 방음벽을 설치하는 것과 같이 외부에 전파되는 소음을 차단하는 대책이 적용되고 있다. 반면, 역사 플랫폼에서 열차 정차 및 통과로 인해 발생하는 진동 및 소음공해는 탑승을 위해 대기 중인 승객들에게 그대로 전달되고 있는 실정이며, 이는 대기 중인 승객들에게 다소 불쾌감과 거부감을 줄 수도 있다. 이 논문에서는 지상역사에서 플랫폼에 전달되는 소음을 저감하기 위해 흡음형, 간섭형, 공명형과 같은 여러 방음벽에 사용하고 있는 구조들을 플랫폼 단부에 설치하는 방안을 제시하고 이와 관련된 구조해석 검토를 수행하여 결과를 제시하였다. 각 경우의 플랫폼에 대한 소음해석은 VIRTUAL LAB을 이용하여 수행하였다.

This paper were studied overseas development practices for develop to silent bridge. This paper suggests considerations of the development of silent bridge using the result of the investigation. Finally, this paper suggests the research direction of the development of silent bridge.

This study, for the development of next generation high speed railway system of a train which has maximum speed over 400km/h, is to develop core generic environmental technologies which are soundproof technology. Also this technology contains the emitting noise performance of high speed operated trains. The ultimate purpose of this study is to develop a new technology of core sound proof system which is more economical and efficient to cope with the noise increased about 7~9dB as the operating speed increased to 400km/h. In view of technology, this study is to the new soundproof shape design, noise absorbing material development, core soundproof facility development, noise reduction method which contains the aerodynamic characteristics of noise, the concrete bed track reflecting noise reduction, the specifications absorbing block of concrete bed and the installation and management of core soundproof system.

We investigated and analysed the actual conditions and characteristics of railroad noise levels for 17 sites in the vicinity of the Seoul-Pusan Line. The results are summarized. as follows : 1) Railroad noise level ranged to 64∼74 L_eq dB(A) at day time and ranged to 60∼72 L_eq dB(A) at night time. 2) Increased night noise level depend on the increase of trains passing at night time. 3) The major factor of increased noise level in the vicinity of stations are using loudspeakers and stream whistle on trains. 4) Decreased effect of noise according to distance is able to be described quantitatively using regression equations of multiplicative model. L_eq=78.59 X^-0.056 n=25, r=-0.994, s.e.=1.007 P_av =105.68X^-0073, n =25, r =-0.997, s.e. = 1.007 Also increased and decreased effect of noise according to floor in apartment is able to be described quantitatively using regression equations of multiplicative model. L_eq = 64.238 X^0.0567, n = 39, r = 0.787, s. e. = 1.004 P_av. = 79.963 X^0.0254 n = 39, r = 0.689, s. e. = 1.056 5) Average noise level in high floor is over 70L_eq dB(A) at day and night time, so more detailed soundproofing countermeasured in high floors apartment is required.