scholarly journals Kinematic analysis of maximum velocity phase in 100m hurdles: A case study

2021 ◽  
Vol 018 (018) ◽  
pp. 91-110
Author(s):  
Essam Fathy Ghareb , Moamen Mohamed Abd El gawad
Keyword(s):  
Kinematic Analysis ◽  
Maximum Velocity

Kinematic Analysis of Biathlon Using Surface EMG : Case Study

2018 ◽  
Vol 27 (5) ◽  
pp. 1469-1476
Author(s):  
An-Sik Heo ◽  
Jung-Chul Lee ◽  
Jae-Young Park
Keyword(s):  
Kinematic Analysis ◽  
Surface Emg

scholarly journals Vibration Analysis and Empirical Law Definition for Different Equipment in a Civil Construction

2020 ◽  
Vol 10 (14) ◽  
pp. 4689 ◽  
Author(s):  
Rafael Rodríguez ◽  
Marc Bascompta
Keyword(s):  
Maximum Velocity ◽  
Poor Quality ◽  
International Standards ◽  
Economic Implications ◽  
Standard Values ◽  
Historical Sites ◽  
The Impact ◽  
Term Maintenance

The potential affection of any construction, and especially historical sites, is of great concern for their long-term maintenance and stability. This study has determined the vibration behavior in poor-quality rock mass conditions generated by some of the most typical equipment used in construction: excavator, ripper, ripper vibrator, hydraulic hammer, bulldozer and vibrating roller. Several empirical expressions are proposed to know the maximum velocity at different distances for each type of equipment, taking into account the intensity of the vibration generated and its pattern. A general equation has also been defined to determine the vibration propagation along the distance at a construction site, based on the impact generated by all the possible vibration elements, exogenous and endogenous, including machinery working individually or in any possible combination and number. On the other hand, the maximum allowable velocity in the case study is also discussed and compared to international standards, stating some recommendations. It would be very important to have a clear legislation in this regard due to the high density of sensitive constructions in Spain and the economic implications of applying too high or too low standard values.

scholarly journals Kinematic Analysis of a Clamp-Type Picking Device for an Automatic Pepper Transplanter

Agriculture ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 627 ◽  
Author(s):  
Md Nafiul Islam ◽  
Md Zafar Iqbal ◽  
Mohammod Ali ◽  
Milon Chowdhury ◽  
Md Shaha Nur Kabir ◽  
...  
Keyword(s):  
Kinematic Analysis ◽  
High Speed ◽  
Model Simulation ◽  
Mechanical Damage ◽  
Maximum Velocity ◽  
Operating Conditions ◽  
High Speed Photography ◽  
Virtual Model ◽  
Significant Difference ◽  
Simulation And Validation

Pepper is one of the most vital agricultural products with high economic value, and pepper production needs to satisfy the growing worldwide population by introducing automatic seedling transplantation techniques. Optimal design and dimensioning of picking device components for an automatic pepper transplanter are crucial for efficient and effective seedling transplantation. Therefore, kinematic analysis, virtual model simulation, and validation testing of a prototype were conducted to propose a best-suited dimension for a clamp-type picking device. The proposed picking device mainly consisted of a manipulator with five grippers and a picking stand. To analyze the influence of design variables through kinematic analysis, 250- to 500-mm length combinations were considered to meet the trajectory requirements and suit the picking workspace. Virtual model simulation and high-speed photography tests were conducted to obtain the kinematic characteristics of the picking device. According to the kinematic analysis, a 350-mm picking stand and a 380-mm manipulator were selected within the range of the considered combinations. The maximum velocity and acceleration of the grippers were recorded as 1.1, 2.2 m/s and 1.3, 23.7 m/s2, along the x- and y-axes, respectively, for 30 to 90 rpm operating conditions. A suitable picking device dimension was identified and validated based on the suitability of the picking device working trajectory, velocity, and acceleration of the grippers, and no significant difference (p ≤ 0.05) occurred between the simulation and validation tests. This study indicated that the picking device under development would increase the pepper seedling picking accuracy and motion safety by reducing the operational time, gripper velocity, acceleration, and mechanical damage.

scholarly journals Is the maximum velocity of carboxylation (Vcmax) well adjusted for deciduous shrubs in DGVMs? A case study for the Caatinga biome in Brazil

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
L. F. C. Rezende ◽  
B. C. Arenque ◽  
S. T. Aidar ◽  
M. S. B. Moura ◽  
C. Von Randow ◽  
...  
Keyword(s):  
Maximum Velocity ◽  
Caatinga Biome ◽  
Deciduous Shrubs

scholarly journals Kinematic Analysis of Canoe Stroke and its Changes During Different Types of Paddling Pace - Case Study

2011 ◽  
Vol 29 (1) ◽  
Author(s):  
František Zahálka ◽  
Tomáš Malý ◽  
Lucie Malá ◽  
Martin Doktor ◽  
Jan Větrovský
Keyword(s):  
Kinematic Analysis ◽  
Different Types

scholarly journals Kinematic Analysis of the Racket Position during the Table Tennis Top Spin Forehand Stroke

2021 ◽  
Vol 11 (11) ◽  
pp. 5178
Author(s):  
Ivan Malagoli Malagoli Lanzoni ◽  
Sandro Bartolomei ◽  
Rocco Di Michele ◽  
Yaodong Gu ◽  
Julien S. Baker ◽  
...  
Keyword(s):  
Kinematic Analysis ◽  
National Level ◽  
Maximum Velocity ◽  
Maximum Speed ◽  
Maximum Height ◽  
Table Tennis ◽  
Tennis Players ◽  
Long Line ◽  
Minimum Height ◽  
The Moment

The present study aims to assess the position of the racket, and racket height with respect to the floor, during the table tennis top spin stroke. A stereophotogrammetric system (Smart-D, BTS, 8 cameras, 550 Hz) was used to track the table tennis racket during cross-court (CC) and long-line (LL) shots. Ten national level players completed ten CC and ten LL top spin strokes responding to a robot machine. The racket motion throughout the shot showed specific technical characteristics: the minimum height of the racket was detected during the backswing phase; racket height at the end of backswing phase (maximal distance racket/table) was higher than the minimum; height at the racket maximum velocity (ball/racket impact) was greater than the net’s height. Furthermore, the maximum height of the racket occurred at the end of the forward swing. No differences in these kinematic variables between CC and LL were found. Conversely, a higher inclination of the racket at the moment of maximum speed was detected in LL vs. CC. From a practical perspective, the present findings suggest that table tennis players need to introduce specific exercises in order to increase the height of the racket during the forehand top spin stroke, to improve its effectiveness.

scholarly journals A NOVEL SEISMIC VULNERABILITY ASSESSMENT OF MASONRY FAÇADES: FRAMING AND VALIDATION ON CALDAROLA CASE STUDY AFTER 2016 CENTRAL ITALY EARTHQUAKE

Rivista Tema ◽  
2021 ◽  
Vol 7 (N.2 (2021)) ◽  
Author(s):  
Keyword(s):  
Vulnerability Assessment ◽  
Kinematic Analysis ◽  
Seismic Vulnerability ◽  
Central Italy ◽  
Vulnerability Index ◽  
Assessment Method ◽  
Damage State ◽  
Central Italy Earthquake ◽  
Observed Damage

An important portion of the historical built environment, which is characterized by un-reinforced masonry, is particularly vulnerable to collapse in case of earthquakes, as demonstrated by recent events. Strategies to target the facades of the most vulnerable buildings need to be tailored for retrofitting and emergency planning. In this research, a novel expeditious vulnerability assessment method, particularly suitable for historical masonry aggregates, is proposed. The method allows assessing the vulnerability index based on information available from external surveys on the building, thus facilitating and speeding up the investigation. If other more precise information (e.g., curbs and tie rods effectiveness) is available, the vulnerability estimation can be improved. The method focuses on out-of-plane mechanisms of the facade, which cause debris to fall on adjacent streets, impeding emergency response. The expeditious method is tailored starting from analytical methods applied on a large sample of historical buildings hit by earthquakes, and validated by means of comparison with kinematic analysis and observed damage state on a relevant case study, Caldarola (Macerata, Central Italy, which was struck by the earthquake in 2016). Results show a good agreement between the proposed method, the kinematic analysis, and the observed damage state of the considered case study, with 75% and 87.5% correspondence, and the method is especially precise for evaluating highly damaged facades.

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