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COMPARISON BETWEEN FEASIBIITY OF HIGH SPEED RAIL & ELECTROMAGNETIC RAIL IN BANGLADESH(PART-5)

Environmental Compatibility


The development and introduction of a new transportation system like the Transrapid maglev system makes the most sense when it is also ecological advantages and can contribute to a reduction in pollution caused by traffic.


Positive environmental characteristics of the Transrapid:

  • No rolling or propulsion noise due to the non-contact technology.



  • No emission of combustion gases or other pollutants along the route.



  • Independent of the type of primary energy.



  • Lowland consumption of the elevated guideway, e.g. for agriculture.



  • No division of the landscape, developed structures, or biological habitats through use of the elevated guideway.



  • No impairment of game movements with the elevated guideway and uninhibited passage for amphibians and small animals under the at-grade guideway.



  • Few embankments and cuttings and minimal disruption of the landscape.



  • Ability to adapt to the topographic conditions with the various guideway types and flexible route alignment parameters.



Noise Emission


This international measuring unit imitates the sensitivity of the human ear. The scale ranges from 0 Db (A)(audible threshold) to 130 Db (A)(pain threshold).


Compared with other transport systems, the Transrapid hovers almost soundlessly through cities and metropolitan areas. 


Energy Consumption


The favorable energy consumption figures of the Transrapid system are a result of the use of modern power electronics , the lack of electromechanical energy conversion using friction-based elements for propulsion and on-board power supply, the high efficiency of the synchronous longstator motor with excitation by the vehicle's support magnets, and the favorable vehicle data, e.g. the low mass of approx. 0.5 t per seat and the low running resistance of approx. 0.2 Kn per seat at 400 km/h (250mph).


When compared at equivalent distances, the specific primary energy consumption of automobile traffic is three times higher and air traffic five times higher than the Transrapid.


Vibration


When the Transrapid passes by, vibration is passed from the guideway into the ground via the foundations. These vibrations are subject in Germany to the Federal Emission Control Act. In accordance with DIN 4150(Structural vibration -Effects of vibration on structures, FOREIGN STANDARD), vibration severity is measured in KB and takes account of the duration and intensity of the influence (similar to the assessment level for sound emission). 


Measurements at the Transrapid Test Facility (TVE) have shown that the vibrations at a distance of 25m (82 ft) and a speed of 250km/h (155mph) (a typical speed in urban areas) are below the "threshold of feeling" for human beings. At a distance of 50m (164 ft), no vibration is perceivable at any speed.


Weather Influences


A tremendous advantage of track-bound transportation system is that they are relatively unaffected by the weather. This also true for the Transrapid maglev system. Its non-contact technology functions even under extreme weather conditions.

  • The propulsion components are the Transrapid maglev system are protected underneath the guideway from snow and ice.



  • If more snow or ice collects on the guideway than the specifications allow, a special vehicle will clear the guideway. Clearing is made easier by the smooth upper surface of the guideway.



  • Cross winds & gust have little effect on the Transrapid because of its active control and guidance system. Wind velocities of up to 30 m/s (67 mph) have no effect on operation at all. At the Transrapid Test Facility (TVE), it has been proved that the vehicle can be operated with difficulty at speeds up to 350 km/h (220 mph) wind gusts up to 150 km/h(94 mph).



Attractive Trip Times-On All Connections


The Transrapid is versatile and suited for applications. As a fast link between a city centre and its outer lying airport, as a fast regional system in metropolitan areas, or as a fast and cost-effective between city pairs. As a part of a sophisticated and powerful inter-modal network in which or transportation systems are connected in a sensible way. And not only for high-speed passengers service but also for high- value goods that requires urgent delivery. 


Modern airports are often located for outsides of cities. Frequently, the journey to or from the airport takes as long as the flight itself. A Transrapid city- to-airport link can shorten overall travel time significantly.Available capacities can be better utilized with the traffic volume being handled in an optimum fashion .For such a link the Transrapid can cover a distance of about 30 km (19 miles) in less than 10 minutes.


The Transrapid is not only fast, but it can also accelerate quickly too high speeds.300 km/h (185 mph) can be reached after a distance of only 5 km (3 miles). 


A modern high-speed train requires more than 28 km (18 miles) and at least four times as long to reach the same speed. The Transrapid maglev system can therefore be used to advantage not only for long distance but also for short and medium distances in metropolitan areas with short intervals between stops.


The non-contact levitation and propulsion technology of the Transrapid maglev system allows cost-effective operations at considerably higher speed (500 km/h or 310 mph).Consequently, for medium and long distances(upto about 800 km or 500 miles), Transrapid trip times are much shorter than for high speed rail and similar to those of airplanes. 


Travel Speed


Its extraordinary dynamic performance, high average speed, and a propulsion system, which can be tailored to the landscape and condition, allow Transrapid trip times comparable to those of airplanes for medium and long distances. Evn intermediate stops increase the trip time by just a few minutes.



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