Abstract
The article presents the results of tests of a freight dual-system electric locomotive 2EV120 when operating in stationary mode and moving at normalized speed. In the course of conducting experimental studies of the sound level of external noise during operation of a locomotive at a constant and alternating current, exceeding the regulatory requirements at individual observation points was found, and it was noticed that the operation of the traction transformer is the main source of increased noise, the main component of which is air in this case. It has been established that in the sound field formed around an electric locomotive operating in the parking lot, the distribution of sound levels is uneven. An example, given in the article, describes the distribution of sound levels when an electric locomotive is operated on alternating current before and after the application of noise protection measures. In the process of testing, a set of organizational and technical measures was developed, the implementation of which reduced the external noise of the electric locomotive 2EV120 as a whole to the regulatory requirements. In particular, to reduce the noise from the operation of the traction transformer, as one of the options, it is proposed to install a shielding device in its sub-body part, the minimum efficiency of which was 4.2 dBA. Analysis of the regulatory margin for external noise showed that its value at the observation point located opposite one of the operating traction transformers equipped with a shielding device is minimal. One of the reasons for this in this case is the sound energy penetrating through the body covering of a large area, generated by the work of the locomotive's internal equipment. In order to increase the regulatory margin when the 2EV120 electric locomotive is operating at a constant current, the authors propose the following: to strengthen the sound insulation capacity of the thin-walled body plating of the electric locomotive by installing a double-wall sound-insulating structure with sound-absorbing material inside it.
Highlights
In the course of conducting experimental studies of the sound level of external noise during operation of a locomotive at a constant and alter nating current, exceeding the regulatory requirements at individual observation points was found, and it was noticed that the operation of the traction transformer is the main source of increased noise, the main component of which is air in this case
In the process of testing, a set of organizational and technical measures was developed, the implementation of which reduced the external noise of the electric locomotive 2EV120 as a whole to the regulatory requirements
Analysis of the regulatory margin for external noise showed that its value at the observation point located opposite one of the operating traction transformers equipped with a shielding device is minimal
Summary
Представлены результаты испытаний электровоза двойного питания 2ЭВ120 по показателю внешнего шума при его работе в стационарном режиме и движении с нормируемой скоростью. 1. Во время испытаний в режиме постоянного тока функционировало следующее оборудование электро воза: тяговый трансформатор — обмотки индуктивного фильтра, система охлаждения (2 масляных насоса); тя говый преобразователь — внутренние системы, система охлаждения (2 насоса охлаждающей жидкости); вен тилятор наддува кузова; башня охлаждения (пассивно, вентиляторы не включались). На Экспериментальном кольце АО «ВНИИЖТ» авторами были проведены испытания по измерению уровня звука внешнего шума от элек тровоза 2ЭВ120 No 001 при его движении с норматив ной скоростью 80 км/ч на переменном и постоянном токе. Испытания проводились до реализации на электровозе шумозащитных мероприятий на участке стыкового пути, при движении по которому допусти мый уровень звука внешнего шума электровоза со ставляет 87 дБА.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
