504 On the Occurrence Conditions of Stick-Slip Phenomena in a Hydraulic Driving System

2000 ◽  
Vol 2000.37 (0) ◽  
pp. 167-168
Author(s):  
Ryo KUMAKURA ◽  
Eisuke TAKANO ◽  
Masato SAEKI
Keyword(s):  
2014 ◽  
Vol 659 ◽  
pp. 237-242
Author(s):  
Ioan Sebesan ◽  
Gabriel Popa ◽  
Marius Adrian Spiroiu

During circulation the railway vehicle is subjected to the action of dynamic forces under the effect of shocks that appear in the driving system caused by stick slip phenomenon, dynamic forces arising from the rolling process when the wheelset is passing over accidental vertical unevenness of the track and also longitudinal dynamic forces occurring in the case of buffering, respectively those caused by frontal impact (the crash forces). The present paper presents the mechanical and mathematical models which are underlying the evaluation of the magnitude of these forces as well as their effects on the resistance of supporting structure of the vehicle and on traffic safety.


2018 ◽  
Vol 16 (11) ◽  
pp. 855-861
Author(s):  
Jian-Ming Sun ◽  
Zhi-Peng Fan ◽  
Yu-Jia Liu

Author(s):  
Wei Zhang ◽  
Sihan Shen ◽  
Yonggang Meng

This paper designs a composite microtribology experiment system (CMES) to observe the sidewall friction of silicon micro-component pairs. The CMES is composed of a microtribological chip, an out-chip driving system, a video acquiring system, a laser triangulation displacement measure system (LTDMS), and a data processing system. Each microtribological chip has four cantilever friction pairs arranged anti-symmetrically. The size of the cantilever is 200um×50um×5um. The out-chip driving system loads the normal press force on the microtribological chip and produces reciprocating vibration meanwhile to achieve the friction. The video acquisition system is made up of a zoom microscope, a CCD, and a monitor. The LTDMS includes a diode laser, two optical focusing system, and a PSD (Position Sensitive Detectors). Both the video acquiring system and the LTDMS measures the friction characteristics from static to dynamic. The preliminary experiments shows: 1) The CMES has sufficient robustness and reliability. 2) The phenomenon of stick-slip is observed at static state by the LTDMS; 3) and the friction coefficient decreases with the increasing of the reciprocating frequency.


Author(s):  
Rajesh Kumar Gupta ◽  
L. N. Padhy ◽  
Sanjay Kumar Padhi

Traffic congestion on road networks is one of the most significant problems that is faced in almost all urban areas. Driving under traffic congestion compels frequent idling, acceleration, and braking, which increase energy consumption and wear and tear on vehicles. By efficiently maneuvering vehicles, traffic flow can be improved. An Adaptive Cruise Control (ACC) system in a car automatically detects its leading vehicle and adjusts the headway by using both the throttle and the brake. Conventional ACC systems are not suitable in congested traffic conditions due to their response delay.  For this purpose, development of smart technologies that contribute to improved traffic flow, throughput and safety is needed. In today’s traffic, to achieve the safe inter-vehicle distance, improve safety, avoid congestion and the limited human perception of traffic conditions and human reaction characteristics constrains should be analyzed. In addition, erroneous human driving conditions may generate shockwaves in addition which causes traffic flow instabilities. In this paper to achieve inter-vehicle distance and improved throughput, we consider Cooperative Adaptive Cruise Control (CACC) system. CACC is then implemented in Smart Driving System. For better Performance, wireless communication is used to exchange Information of individual vehicle. By introducing vehicle to vehicle (V2V) communication and vehicle to roadside infrastructure (V2R) communications, the vehicle gets information not only from its previous and following vehicle but also from the vehicles in front of the previous Vehicle and following vehicle. This enables a vehicle to follow its predecessor at a closer distance under tighter control.


2012 ◽  
Vol 17 (4) ◽  
pp. 319-326 ◽  
Author(s):  
Zbigniew Chaniecki ◽  
Krzysztof Grudzień ◽  
Tomasz Jaworski ◽  
Grzegorz Rybak ◽  
Andrzej Romanowski ◽  
...  

Abstract The paper presents results of the scale-up silo flow investigation in based on accelerometer signal analysis and Wi-Fi transmission, performed in distributed laboratory environment. Prepared, by the authors, a set of 8 accelerometers allows to measure a three-dimensional acceleration vector. The accelerometers were located outside silo, on its perimeter. The accelerometers signal changes allowed to analyze dynamic behavior of solid (vibrations/pulsations) at silo wall during discharging process. These dynamic effects are caused by stick-slip friction between the wall and the granular material. Information about the material pulsations and vibrations is crucial for monitoring the interaction between silo construction and particle during flow. Additionally such spatial position of accelerometers sensor allowed to collect information about nonsymmetrical flow inside silo.


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