New Publications are available for Other specific mechanical properties (mechanical engineering)
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New Publications are available now online for this publication.
Please follow the links to view the publication.Use of real time creep force estimation data for assessment of low adhesion in the wheel/rail contact
http://dl-live.theiet.org/content/conferences/10.1049/cp.2011.0614
Low adhesion in railway vehicle wheel/rail contact can create large cost and punctuality issues for train operators and users. There is currently a lack of real time knowledge of the running conditions on networks, therefore the work reported here proposes a method of detecting dynamically the adhesion conditions underneath a rail vehicle using modest cost sensors and advanced model based monitoring of the creep forces. The estimated creep forces are then post processed to give an estimation of the current adhesion condition. (6 pages)The magnetic field analysis and optimization of permanent-magnetic adhesion device for a novel wall-climbing robot
http://dl-live.theiet.org/content/conferences/10.1049/cp.2009.1531
The climbing-wall robot based on permanent-magnet adsorption is always concentrated on tracked-type, but robot with this type is deficient flexibility when it moves. In this paper, a new permanent-magnet adhesion device of an adjustable pole is introduced in the wheel-type robot, the device can provide 1500 N force when the air gap between the device and wall is 4 mm to meet load requirement in working state, and at this time the magnetic flux leakage is very small. While permanent magnetic force is almost approach zero when device in non-operating state, so the robot can up and down the wall conveniently. The mathematic model is established by Finite Element Method to calculate and design magnetic field. The finite element software is used to analyze and optimize the magnetic field distribution, magnetic field intensity as well as the structure size which will affect magnetic field intensity to the device. Optimization results show that every parameter has a different influence on adsorbability of the device when it changes. Ratio between the maximum and minimum of adsorbability in two states is more than 5666 times when structure is designed reasonably. (5 pages)Low adhesion estimation
http://dl-live.theiet.org/content/conferences/10.1049/ic_20060051
Low adhesion in wheel-rail contact causes huge problems for scheduling and safety of railway networks. Braking and guidance forces have the same force generation mechanism, via the creep forces at the wheel-rail contact. This paper demonstrates the application of a Kalman filter to estimate the adhesion condition on the rails. The key aspect of this approach is that estimation is carried out on-line, during normal running, i.e. before the brakes have been applied. This will give a full network-wide picture of low adhesion conditions. The results show that the different adhesion levels cause different responses in the railway vehicle, and that a Kalman filter can estimate wheelset forces well, to give an indication of the adhesion level. The work is successfully applied to a Simulink half vehicle model.Study on adhesion failure of milling insert in milling stainless steel
http://dl-live.theiet.org/content/conferences/10.1049/cp_20060958
The measuring temperature and force experiments of cutting heat-resistance steel (3Cr-1Mo-1/4V alloy and 1Cr18Ni9 alloy) by plane milling insert and milling insert with complex groove that invented by ourselves has been done, meanwhile, the falling process of sticking-welding chip when milling insert cut-in and cut-out has been observed by high-speed photograph. The results of experiment and analysis show that the main reasons of adhesion failure are heat that produced in cutting process and the change of temperature grades during cut-in or cut-out and alternate tension stress and stress impact during cut-in or cut-out., which provides technical support and experimental data for the groove's optimization and reconstruction of milling insert with 3D complex groove.