scholarly journals Experimental and Numerical Characterization of CaPaMan 2bis Operation

2010 ◽  
Vol 8 (01) ◽  
Author(s):  
E E Hernandez Martinez ◽  
L Conghui ◽  
G Carbone ◽  
M Ceccarelli ◽  
C S LopezCajun
Keyword(s):  
Parallel Manipulator ◽  
Tracking System ◽  
Experimental Tests ◽  
Three Dimension ◽  
Virtual Model ◽  
System Behavior ◽  
Operation Performance ◽  
End Effector ◽  
Numerical Characterization

In this paper, the operation performance of CaPaMan 2bis (Cassino Parallel Manipulator 2 bis) was investigated through lab experimental tests and computer simulations. Milli‐CaTraSys (Milli‐Cassino Tracking System) was implemented to determine displacements and orientation variations of CaPaMan 2bis end‐effector during experimental tests. A 3D (three dimension) virtual model was built in ADAMS environment to simulate the operation behavior for different prescribed motions. Several prescribed motions have been simulated and tested under different conditions in order to characterize the system behavior. In particular, the kinematic characteristics were obtained from both, experimental tests and numerical simulations. Finally, experiment results and simulation computations were compared for purpose of performance evaluation and design characterization of the parallel manipulator structure and its prototype.

scholarly journals Experimental tests on operation performance of a LARM leg mechanism with 3-DOF parallel architecture

2015 ◽  
Vol 6 (1) ◽  
pp. 1-8 ◽  
Author(s):  
M. F. Wang ◽  
M. Ceccarelli ◽  
G. Carbone
Keyword(s):  
Parallel Architecture ◽  
Experimental Tests ◽  
Operational Performance ◽  
Architecture Design ◽  
System Behavior ◽  
Operation Performance ◽  
Isosceles Trapezoid

Abstract. In this paper, a prototype of a LARM leg mechanism is proposed by using a tripod manipulator and its operation performance is investigated through lab experimental tests. In particular, an experimental layout is presented for investigating operational performance. A prescribed motion with an isosceles trapezoid trajectory is used for characterizing the system behavior. Experiment results are analyzed for the purpose of operation evaluation and architecture design characterization of the tripod manipulator and its proposed prototype.

Experimental and Numerical Characterization of a Rail Steel Behavior under Cyclic Contact Stresses

2007 ◽  
Vol 348-349 ◽  
pp. 569-572
Author(s):  
Angelo Mazzù
Keyword(s):  
Crack Formation ◽  
Structural Integrity ◽  
Rail Steel ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Experimental Tests ◽  
Rolling Contact ◽  
Formation Condition ◽  
Numerical Characterization

Wear and rolling contact fatigue interaction in rolling/sliding contact is an important topic in the research on structural integrity of rails and railway wheels. Wear is in competition with rolling contact fatigue, as it removes surface material layers, reducing cracks length and hindering their propagation. Cracks nucleate by accumulation of cyclic unidirectional plastic strain (ratcheting). In this paper a model for ratcheting assessment is discussed and applied to the UIC 900A steel, after a calibration based on experimental results. The experimental tests allow also a characterization of the crack formation condition for this material. By this model, a computer program is developed in order to simulate in a very short time the effect of a large number of load cycles, providing a tool for predicting crack formation and propagation rates.

An application of CaTraSys, a cable-based parallel measuring system for an experimental characterization of human walking

Robotica ◽  
2009 ◽  
Vol 28 (1) ◽  
pp. 119-133 ◽  
Author(s):  
Erika Ottaviano ◽  
Marco Ceccarelli ◽  
Francesco Palmucci
Keyword(s):  
Parallel Manipulator ◽  
Tracking System ◽  
Experimental Results ◽  
Measuring System ◽  
Human Walking ◽  
Experimental Characterization ◽  
Experimental Identification ◽  
Human Limb

SUMMARYIn this paper, an application is presented of a cable-based parallel manipulator as measuring system for an experimental identification of human walking characteristics. Experimental results have been obtained by means of a new version of CaTraSys (Cassino Tracking System), which is a measuring system that has been designed and built at Laboratory of Robotics and Mechatronics (LARM) in Cassino, Italy. The new version of the CaTraSys system has been used to determine the trajectory of the human limb extremity during walking operation and furthermore the system is able to measure forces that are exerted by a limb. Experimental determination of articulation mobility is also presented with numerical and experimental results.

scholarly journals Characterization of Highly Irradiated ALPIDE Silicon Sensors

Universe ◽  
2019 ◽  
Vol 5 (4) ◽  
pp. 91
Author(s):  
Valentina Raskina ◽  
Filip Křížek
Keyword(s):  
Nuclear Physics ◽  
Detection Efficiency ◽  
Tracking System ◽  
Physics Institute ◽  
Total Ionization ◽  
Silicon Sensors ◽  
Active Pixel ◽  
Academy Of Sciences

The ALICE (A Large Ion Collider Experiment) experiment at CERN will upgrade its Inner Tracking System (ITS) detector. The new ITS will consist of seven coaxial cylindrical layers of ALPIDE silicon sensors which are based on Monolithic Active Pixel Sensor (MAPS) technology. We have studied the radiation hardness of ALPIDE sensors using a 30 MeV proton beam provided by the cyclotron U-120M of the Nuclear Physics Institute of the Czech Academy of Sciences in Řež. In this paper, these long-term measurements will be described. After being irradiated up to the total ionization dose 2.7 Mrad and non-ionizing energy loss 2.7 × 10 13 1 MeV n eq · cm - 2 , ALPIDE sensors fulfill ITS upgrade project technical design requirements in terms of detection efficiency and fake-hit rate.

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