External noise characteristics analysis of straddle-type monorail transit based on field tests

2020 ◽  
Vol 68 (6) ◽  
pp. 501-510
Author(s):  
Junping Xue ◽  
Zixue Du ◽  
Zhen Yang ◽  
Renxiang Chen
Keyword(s):  
Noise Reduction ◽  
Traffic Noise ◽  
Field Tests ◽  
External Noise ◽  
Urban Rail Transit ◽  
Time Data ◽  
Radiation Characteristics ◽  
Transit System ◽  
Noise Characteristics ◽  
Slope Line

Compared with the traditional urban rail transit system, the running mechanism, line laying structure and operating environment condition of straddle-type monorail transit are unique. Therefore, external noise radiated by the train has its own characteristics when the train is running. In order to improve the acoustic quality and explore the methods of noise reduction, it is necessary to carry out field test and understand its radiation characteristics. In this study, typical running lines of straddle-type monorail transit are selected for multi-state and multi-site field tests of external noise of the running train. The test conditions include straight line running state, curve line running state, slope line running state, entry and exit station state. The obtained time data are post-processed in timefrequency domain, and then the radiation characteristics of external noise are analyzed in detail. The time domain characteristic is mainly discussed based on the overall level of external noise of the running train. In frequency domain, the contributions of the sound pressure energy (CSPE) of 1/3 octave bands under each running state of the train are analyzed, and the effects of straddle-type monorail traffic noise and urban road noise on urban transportation noise are evaluated using energy contribution analysis method. Finally, the main noise sources are briefly identified and analyzed. The research results will be helpful to provide meaningful reference for noise reduction and control.

Asphalt wearing course optimization for road traffic noise reduction

2017 ◽  
Vol 152 ◽  
pp. 345-356 ◽  
Author(s):  
Audrius Vaitkus ◽  
Tadas Andriejauskas ◽  
Viktoras Vorobjovas ◽  
Aleksandras Jagniatinskis ◽  
Boris Fiks ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise

scholarly journals Overview of Anti-Seismic Researches of Underground Structures

2018 ◽  
Vol 38 ◽  
pp. 03038
Author(s):  
Ran Liao
Keyword(s):  
Research Methods ◽  
Underground Structure ◽  
Seismic Damage ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Underground Structures ◽  
Transit System ◽  
Urban Rail ◽  
Subway System ◽  
Metro System

With the vigorous development of urban rail transit system, especially the construction of subway system, the safety of subway system draws more and more attention. The study of anti-seismic for underground structures has also become an important problem to be solved in the construction of Metro system. Based on the typical underground structure seismic damage phenomenon, this paper summarizes the seismic characteristics, research methods and design methods of underground structures to offer a guide for engineers.

scholarly journals Study on the Scale Determination of Urban Rail Transfer Station

2012 ◽  
Vol 5 ◽  
pp. 71-76
Author(s):  
Yu Ping Wang ◽  
Ya Ping Zhang ◽  
Hui Zhi Xu
Keyword(s):  
Service Level ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Entire System ◽  
Transit System ◽  
Urban Rail ◽  
Transfer Station ◽  
Cross Platform

As the major distributing center and intermediate transit point, the scale of transfer station in urban rail transit system directly affects the operational efficiency and overall cost of the entire system. So, accurately controlling the scale of transfer station becomes one of the most important aspects in improving service level and reducing the overall project cost. On the basis of summarizing the method on determining the scale of transfer station both home and abroad, the paper describes the role of the various facilities in rail transfer station, and illustrates the problems of our rail transfer station. Following the above discussion and investigation, the sizes of typical transfer station facilities are discussed and improved (e.g. vertical elevator). Taking the Longjiang Street station example, the proposed methods and models are verified and the analysis result shows that this transfer station should be cross platform interchange mode.

scholarly journals URBAN RAIL TRANSIT PASSENGER SERVICE QUALITY EVALUATION BASED ON THE KANO–ENTROPY–TOPSIS MODEL: THE CHINA CASE

Transport ◽  
2021 ◽  
Vol 0 (0) ◽  
pp. 1-12
Author(s):  
Wencheng Huang ◽  
Yue Zhang ◽  
Yifei Xu ◽  
Rui Zhang ◽  
Minhao Xu Xu ◽  
...  
Keyword(s):  
Service Quality ◽  
Quality Indicators ◽  
Quality Indicator ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Kano Model ◽  
Transit System ◽  
Urban Rail ◽  
The Difference ◽  
Topsis Model

In order to evaluate the URTPSQ (Urban Rail Transit Passenger Service Quality) comprehensively, find the shortage of URTPSQ, find out the difference between the actual service situation and the passenger’s expectation and demand,and provide passengers with better travel services, a passenger-oriented KANO–Entropy–TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution) method is proposed and applied in this paper. Firstly, a KANO model is applied to select the service quality indicators from the 24 URTPSQ evaluation sub-indicators, according to the selection results, the KANO service quality indicators of URTPSQ are constructed. Then the sensitivity of the KANO service quality indicators based on the KANO model are calculated and ranked, the PS (Passenger Satisfaction) of each KANO service quality indicator by using the Entropy–TOPSIS method is calculated and ranked. Based on the difference between the sensitivity degree rank and the satisfaction degree rank of each KANO service quality indicator, determine the service quality KANO indicators of the URTPSQ that need to be improved significantly. A case study is conducted by taking the Chengdu subway system in China as a background. The results show that the Chengdu subway operation enterprises should pay attention to the must-be demand first, then the one-dimensional demand, finally the attractive demand. The three indicators, including transfer on the same floor in the station, service quality of staffs of urban rail transit enterprises,and cleanness in the station and passenger coach, need to be improved urgently. For the managers and operators of urban rail transit system, the passengers’ must-be demand should be satisfied first if the KANO model is applied to evaluate the service. The indicators with highest sensitivity degree and lowest TOPSIS value should be improved based on the KANO–Entropy–TOPSIS model.

Noise reduction of enhanced acoustic balconies on a high-rise building block

2021 ◽  
Vol 263 (1) ◽  
pp. 5327-5334
Author(s):  
SK Tang ◽  
Rudolf YC Lee
Keyword(s):  
Noise Reduction ◽  
Natural Ventilation ◽  
Traffic Noise ◽  
Elevation Angle ◽  
Noise Levels ◽  
Indoor Space ◽  
New Device ◽  
Air Inlet ◽  
The Difference ◽  
The Impact

A new device called 'enhanced acoustic balcony' is installed in a new housing estate in Hong Kong. It is intended to help reduce the impact of traffic noise on the residents. This balcony is basically an enlarged form of a plenum window and with three openings. Apart from the outdoor air inlet, there is the balcony door and a side-hung window on the interior balcony wall for natural ventilation of the indoor space. Sound absorption of NRC 0.7 is installed on the balcony ceiling and its sidewall facing the incoming traffic noise and an inclined panel is installed outside the balcony to provide noise screening. A site measurement of its noise reduction is carried out in the present study in a newly completed housing block. A 28 m long loudspeaker array is used as the sound source. The indoor noise levels are measured according to ISO standard. The results show that the difference between indoor and outdoor noise levels in the presence of this balcony form varies over a relatively narrow range between 10 to 13 dBA for an elevation angle from 25 to 60 deg. There is a weak increase of the noise level difference with elevation angle.

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