The design of dry-running friction pairings and systems determines not only their installation space and costs,but also their reliability under critical load conditions,for example in emergencies,in the case of faults...The design of dry-running friction pairings and systems determines not only their installation space and costs,but also their reliability under critical load conditions,for example in emergencies,in the case of faults,and in the event of misuse.While knowledge of the contact pattern is highly important for the development of clutches and brakes,the contact-related measurement of the temperature of these systems has not yet been solved in a satisfactory manner.Despite its importance,the temperature distribution has only been measured in a few studies.Typically,temperature measurements of complete clutches and brakes are carried out using thermocouples only.In this study,a new innovative test setup is presented.This setup is able to measure the heat distribution of the lining and the steel disk of a brake with high spatial resolution by means of fiber optic sensing technology and thermography.As a novelty,it enables measurement of the heat distribution and allows to correlate it with the fade and recovery behavior.Contrary to the expectations,the contact pattern is heterogeneous in circumferential direction.Possible causes are discussed using simulation results.Along with surface analysis,the new setup contributes to the investigation of the causes of fade and recovery.展开更多
In order to study the temperature distribution and the corresponding temperature effects on pre-stressed concrete（PC） curved box girder bridge in Shandong Province, this paper builds and adopts an automatic remote r...In order to study the temperature distribution and the corresponding temperature effects on pre-stressed concrete（PC） curved box girder bridge in Shandong Province, this paper builds and adopts an automatic remote real-time temperature collection system to collect temperature data on site, and further uses the software ANSYS for analysis. Based on the comparisons between the measured data and the simulation results, the following conclusions can be drawn： 1 Our temperature monitoring system is reliable; 2 The corresponding measured data of the web plate and flange plate exposed to the sun, vary more severely than that at other positions, so these plates need higher standard design and construction requirements; 3 In the cold wave where still is sunshine, the box girder temperature effect behaves as sine-like curve.展开更多
基金The project 19377-N of the Research Association for Drive Technology is funded as part of the program for the promotion of industrial community research by the Federal Ministry for Economic Affairs and Energy on the basis of a decision by the German Bundestag.
文摘The design of dry-running friction pairings and systems determines not only their installation space and costs,but also their reliability under critical load conditions,for example in emergencies,in the case of faults,and in the event of misuse.While knowledge of the contact pattern is highly important for the development of clutches and brakes,the contact-related measurement of the temperature of these systems has not yet been solved in a satisfactory manner.Despite its importance,the temperature distribution has only been measured in a few studies.Typically,temperature measurements of complete clutches and brakes are carried out using thermocouples only.In this study,a new innovative test setup is presented.This setup is able to measure the heat distribution of the lining and the steel disk of a brake with high spatial resolution by means of fiber optic sensing technology and thermography.As a novelty,it enables measurement of the heat distribution and allows to correlate it with the fade and recovery behavior.Contrary to the expectations,the contact pattern is heterogeneous in circumferential direction.Possible causes are discussed using simulation results.Along with surface analysis,the new setup contributes to the investigation of the causes of fade and recovery.
基金Supported by the China Postdoctoral Science Foundation(2013M531560)the Technology Innovation Plan in Traffic of Shandong Province(2012A15)the Science&Technology Development Projects of Shandong Province(2014GSF120015)
文摘In order to study the temperature distribution and the corresponding temperature effects on pre-stressed concrete（PC） curved box girder bridge in Shandong Province, this paper builds and adopts an automatic remote real-time temperature collection system to collect temperature data on site, and further uses the software ANSYS for analysis. Based on the comparisons between the measured data and the simulation results, the following conclusions can be drawn： 1 Our temperature monitoring system is reliable; 2 The corresponding measured data of the web plate and flange plate exposed to the sun, vary more severely than that at other positions, so these plates need higher standard design and construction requirements; 3 In the cold wave where still is sunshine, the box girder temperature effect behaves as sine-like curve.
