scholarly journals LASER SCATTEROMETRY FOR DETECTION OF SQUAT DEFECTS IN RAILWAY RAILS

2015 ◽  
Vol 33 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Piotr Lesiak ◽  
Tadeusz Szumiata ◽  
Marek Wlazło
Keyword(s):  
Laser Beam ◽  
Research And Development ◽  
Physical Model ◽  
New Method ◽  
Traditional Methods ◽  
Rail Head ◽  
Beam Scattering ◽  
Simulation Results ◽  
Set Up

The paper concerns a defectoscopy of squats occurring on the surface of the rail head. Disadvantages of traditional methods being used in detection of such defects were also presented. Authors proposed a new method based on simplified laser scatterometry to detect these defects. Physical model of the laser beam scattering by edges of such defects and simulation results were given. An experimental set-up for practical testing of this method was designed and constructed. This system enabled measurements of squat defects occurring in the section of the rail extracted from the track. The analysis of obtained results was performed. Authors also indicated directions of further research and development.

scholarly journals ACTIVE NOISE CONTROL USING NEURAL SYSTEM

2010 ◽  
Vol 13 (3) ◽  
pp. 67-74
Author(s):  
Tuan Van Huynh ◽  
Nghĩa Hoai Duong
Keyword(s):  
Noise Control ◽  
Acoustic Noise ◽  
Active Noise Control ◽  
Neural System ◽  
Control Area ◽  
New Method ◽  
Traditional Methods ◽  
Active Noise ◽  
Opposite Phase ◽  
Simulation Results

The principle of active noise control (ANC) is to produce a secondary acoustic noise which has the same magnitude as the unwanted primary noise but with opposite phase. The sum of these two signals reduces acoustic noise in the noise control area. In this paper we present a new ANC method using neural system. Moreover a new method for compensating the saturation of the power applifier is also introduced. The performance of the proposed method is compared to that of traditional methods. Simulation results are provided for illustration.

Virtual Prototype Co-Simulation of 4WS Vehicle

2011 ◽  
Vol 328-330 ◽  
pp. 408-411
Author(s):  
Wei Wei Wang ◽  
Jian Feng Xu
Keyword(s):  
Control System ◽  
Physical Model ◽  
Mechanical Model ◽  
Theoretical Basis ◽  
Virtual Prototype ◽  
Lane Change ◽  
Vehicle Model ◽  
Response Curves ◽  
Simulation Results ◽  
Set Up

A new 4WS vehicle model is set up by means of revamping a foreign FWS model. Co-simulation is completed by loading 4WS mechanical model as a subsystem which is built to express the characteristics of physical model of vehicle in ADAMS/Car into the control system modeled in MATLAB. Moreover, the response curves of evaluating handling stability are obtained according to co-simulation results of step steering maneuvers and single lane change maneuvers. It provides theoretical basis for developing 4WS physical vehicle rapidly.

A WORMHOLE ROUTER WITH EMBEDDED BROADCASTING VIRTUAL BUS FOR MESH COMPUTERS

2000 ◽  
Vol 10 (01) ◽  
pp. 29-37
Author(s):  
BONG WAN KIM ◽  
JONG HYUK CHOI ◽  
KWANG-IL PARK ◽  
KYU HO PARK
Keyword(s):  
New Method ◽  
Two Dimensional ◽  
Simulation Results ◽  
Set Up ◽  
Point To Point

In this paper, we propose a new method of implementing bus operations on mesh wormhole routers with small additional circuits. The bus, called a virtual bus, is set up dynamically upon a request by bypassing existing datapath in wormhole routers. After bus setup, it acts as a real bus by sharing the point-to-point links of the corresponding row/column of the mesh. Simulation results show that the 2D (two-dimensional) mesh with the virtual bus outperforms the mesh with separate buses.

Researches on Dressing Diamond Grinding Wheels on Line by a Diamond Pen Aided with Laser Beam Preheating Based on Optical Fiber Delivering

2006 ◽  
Vol 304-305 ◽  
pp. 109-112 ◽  
Author(s):  
Qi Lin Deng ◽  
An Ning Xie ◽  
K.K. Sun ◽  
G.C. Zhou ◽  
Jian Li Song
Keyword(s):  
Temperature Field ◽  
Laser Beam ◽  
Optical Fiber ◽  
High Efficiency ◽  
New Method ◽  
Mathematics Model ◽  
Grinding Wheels ◽  
Diamond Grinding ◽  
On Line ◽  
Set Up

The dressing on line of diamond grinding wheels used in NC optical curve grinding machines are very difficult. A method has been researched in this paper that is dressing the diamond grinding wheels by a diamond pen aided with laser beam preheating . Its principle has been stated. The temperature mathematics model of laser beam preheating diamond grinding wheels has been set up. The temperature field of resin substrate diamond grinding wheels has been calculated. Through the analyses on the results of the temperature field, it has been known that the distance between laser beam preheating central and the diamond pen dressing point be very small. A new method that is delived laser beam by optical fiber in dressing on line of diamond grinding wheels by a diamond pen aided with laser beam preheating has be proposed. Uasing this new method, a high precision and high efficiency in dressing diamond grinding wheels on line can be fulfiled.

Research of Numerical Simulation Method in Two Pass Deep Drawing Forming of Sheet Metal

2011 ◽  
Vol 189-193 ◽  
pp. 2716-2720
Author(s):  
Zhi Ren Han ◽  
Fu Xia Fan
Keyword(s):  
Numerical Simulation ◽  
Research And Development ◽  
Sheet Metal ◽  
Deep Drawing ◽  
Simulation Method ◽  
New Method ◽  
Numerical Simulation Method ◽  
Simulation Results ◽  
Mould Design ◽  
Development Capability

Numerical simulation is of great importance in sheet metal multistage deep drawing forming, optimizing mould design and improving mould research and development capability. Now researchers have proposed the numerical simulation general steps of multistage deep drawing, but there are still many problems to be resolved. This paper, comprehensively considering the two important factors of influencing the accuracy of the numerical simulation, introduces the numerical simulation simplified steps of two pass stamping forming. Results show that this new method is effective and successful in simulating two pass deep drawing forming, and the simulation results are more reasonable.

Research on Dynamic Balance Method of Precision Centrifuge

2014 ◽  
Vol 945-949 ◽  
pp. 777-780
Author(s):  
Tao Liu ◽  
Yong Xu ◽  
Bo Yuan Mao
Keyword(s):  
Mathematical Model ◽  
Balance Control ◽  
Dynamic Balance ◽  
Dynamic Balancing ◽  
Structure Characteristics ◽  
Balance System ◽  
Simulation Results ◽  
Set Up ◽  
System Controller ◽  
The Mathematical Model

Firstly, according to the structure characteristics of precision centrifuge, the mathematical model of its dynamic balancing system was set up, and the dynamic balancing scheme of double test surfaces, double emendation surfaces were established. Then the dynamic balance system controller of precision centrifuge was designed. Simulation results show that the controller designed can completely meet the requirements of precision centrifuge dynamic balance control system.

scholarly journals Laboratory Measurements of Light Scattering by Dust Particles

1996 ◽  
Vol 150 ◽  
pp. 409-413
Author(s):  
Patrick P. Combet ◽  
Philippe L. Lamy
Keyword(s):  
Light Scattering ◽  
Laser Beam ◽  
Mie Theory ◽  
Spherical Particles ◽  
Dust Particles ◽  
Laboratory Measurements ◽  
Scattering Function ◽  
Hene Laser ◽  
Set Up ◽  
Good Agreement

AbstractWe have set up an experimental device to optically study the scattering properties of dust particles. Measurements over the 8 — 174° interval of scattering angles are performed on a continuously flowing dust loaded jet illuminated by a polarized red HeNe laser beam. The scattering is averaged over the population of the dust particles in the jet, which can be determined independently, and give the “volume scattering function” for the two directions of polarization directly. While results for spherical particles are in good agreement with Mie theory, those for arbitrary particles show conspicuous deviations.

scholarly journals Optimization of Dynamic Task Location within a Manipulator’s Workspace for the Utilization of the Minimum Required Joint Torques

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 288
Author(s):  
Adam Wolniakowski ◽  
Charalampos Valsamos ◽  
Kanstantsin Miatliuk ◽  
Vassilis Moulianitis ◽  
Nikos Aspragathos
Keyword(s):  
High Performance ◽  
Human Robot Interaction ◽  
Optimal Position ◽  
End Effector ◽  
Joint Torques ◽  
Dynamic Task ◽  
Arbitrary Position ◽  
Simulation Results ◽  
Set Up ◽  
Task Placement

The determination of the optimal position of a robotic task within a manipulator’s workspace is crucial for the manipulator to achieve high performance regarding selected aspects of its operation. In this paper, a method for determining the optimal task placement for a serial manipulator is presented, so that the required joint torques are minimized. The task considered comprises the exercise of a given force in a given direction along a 3D path followed by the end effector. Given that many such tasks are usually conducted by human workers and as such the utilized trajectories are quite complex to model, a Human Robot Interaction (HRI) approach was chosen to define the task, where the robot is taught the task trajectory by a human operator. Furthermore, the presented method considers the singular free paths of the manipulator’s end-effector motion in the configuration space. Simulation results are utilized to set up a physical execution of the task in the optimal derived position within a UR-3 manipulator’s workspace. For reference the task is also placed at an arbitrary “bad” location in order to validate the simulation results. Experimental results verify that the positioning of the task at the optimal location derived by the presented method allows for the task execution with minimum joint torques as opposed to the arbitrary position.

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