Papers by Keyword: Motion Analysis

Abstract: The article presents modelling of spherical elements based on the developed computer model. We recorded the main combinations of spherical particles during filling, which are formed in the hopper. It was found that the most likely combination that occurs when modelling spherical elements consists of three balls. It should be noted that in the cross-section of such a combination passing through the center of the balls, an equilateral triangle is formed. And in the cross-section of the structure, which consists of four spherical balls, a rhombus is formed, if you connect the centers of these spherical elements. It is worth noting that from this formed combination of spherical elements, it can be seen that the rhombus forms two smaller equilateral triangles that fix the process of pushing the spherical balls apart. In turn, the process of pushing spherical elements apart made it possible to fix the contact between spherical elements, as well as to state the stable position of each (individual) particle. This paper also presents the main fragments of encoding the source text of a 3D computer model for modelling spherical elements, which made it possible to optimize the model parameters. It was found that from the obtained data on the distribution of coordination numbers for different volume fillings of spherical elements, it follows that the largest filling was 72 %, which corresponds to the state when 112 lobules have an average coordination number of 3,92.

Abstract: During physical therapy rehabilitation, the required exercises need to be personalized according to the patient motion possibilities. The equipment used to analyzed the patient motion is Zebris CMS-HS. With this equipment, for the studied patient, we are able to record the range of motion, angular velocity and acceleration for each joint during different recovery exercises. This records, are the input data for the upper limb model developed in MatLab Simulink software. Using this application is possible to determined the influence of some external forces that are applied during the studied recovery exercises. In this way is possible to established the direction and the maximum value for the external forces that can be applied. Based on this results, a physiotherapist can adjust the exercises to achieve the best solution for the patient recovery.

Abstract: It is frequently the case that the feed rate indicated in a numerical control (NC) program does not obtain in actual machining processes and the cutting tool does not path the points indicated in the NC. A reason underlying such problems is that control gains are not optimized, which causes issues with acceleration and deceleration in the control of machine tools. To address these problems, in this paper, we propose a method for the optimization of control gains using the MATLAB and Simulink software by considering the weight of the workpiece, the controlling distance, and the controlling speed. Simulations confirmed the effectiveness of our proposed optimization.

Abstract: The paper describes an experimental determination of kinematic quantities using high-speed digital image correlation system. It deals with the analysis of minimal sampling frequency needed for correctly performed high-speed correlation analysis. The authors also describe the influence of cameras sampling frequency on the quality of the obtained results. Mentioned analysis was performed using a rotational object. For the purposes of the results comparison the data obtained from correlation system in a form of displacements in three mutually perpendicular directions were processed in Matlab and in the paper are depicted in a form of graphical visualizations.

Abstract: During working of tram the chassis are dynamically loaded through acceleration, deceleration, passage curves and evidently by the roughness of the rail track. These added dynamic loads can significantly increase wearing of the chassis components and drive. In the case of tested tram problems with bearing housing into gear box occurred. Too rigid hinge bedding can cause additional parasitic load to bearings. It is desirable to investigate its stress state during acceleration, deceleration and other common drive regimes. For this purpose, strain gauges are used. Moreover, for the verification and better description of gearbox suspension behaviour, the Qualisys system for capturing and evaluating motion is used. Acquired data are processed in software Matlab and in user interface of the Qualisys software.

Abstract: Virtual Sensei Lite (VS Lite) is an inexpensive user-friendly motion analysis system. As an alternative motion capture system, it is a must for VS Lite’s user to assess the accuracy of the measurement system capability. To date, such analysis to observe the reliability and accuracy of VS Lite has not been reported. Therefore, this study proposes a procedure for assessing the accuracy and capability of the Virtual Sensei Lite using ANOVA Gage Repeatability and Reproducibility (Gage R&R) designed experiments. In this procedure, a gage R&R study is conducted to obtain replicate measurements on nine parts by three operators. The total variation due to measurement error is then observed to identify the accuracy of measurement. The study able to demonstrate on the accuracy of VS Lite as the value of total variation due to measurement error is within 10%-30%.

Abstract: A posture feature extraction and recognition method in monitoring environment is proposed in this paper which can recognize human shapes and analyze human postures. First contours of moving objects are extracted from two frames of a consecutive monitoring video. Then feature parameters are calculated from boundary contours to construct feature vector. In order to classify moving object and human and analyze postures, a DAG-SVMS is constructed by training 100 sample images. Results demonstrate the validity of this method.

Abstract: Compact layout is a problem widely faced in many branches of science, engineering, is also the key point in lightweight design of product. With the perspective of digital design we divided the layout procedure into three stages-only outers, outer-inner, more objects involved-based on (convex hull plus rubber band) CPR. Motion analysis in each stage is done respectively according to physics principles. Rules of Multi-Object collision response are built in two forms, vertex-edge and edge-edge. Objects motions are determined by their motion analysis and collision response rules. An example of Multi-Object compact layout in stimulation platform is given and feasibility of the method is confirmed.

Abstract: Walking beam transport is short for walking beam, mainly is responsible for transporting steel coil,and is an important process equipment and transportation device.The working referring to two parts is mainly studied in this paper.Firstly SolidWorks software was used to analyze the movement and force for the building model; In the second ANSYS software was used to do the structure stress analysis for the main parts of the walking beam.Through the analysis, it could be drawn the stress and deformation relevant data of the walking beam.It found the maximum principal stress is in line with the material allowable stress on the moving beam section.The results proved the moving beam system in the walking beam could satisfy the requirements of production, providing a theoretical basis for the structural analysis of practical production.

Abstract: This paper focuses on the use of infrared reflective photoelectric sensor for an intelligent tracking car which can automaticly recognize feature of routes. Arduino is used to control its motion and enable them to choose the right direction. SolidWorks is also used to model and analyze its motion.