Mechanics: Rectilinear Motion of a Point. Gravity.

1923 ◽  
Vol 16 (4) ◽  
pp. 236-241
Author(s):  
Gordon R. Mirick
Keyword(s):  
Initial Velocity ◽  
Rectilinear Motion ◽  
Final Velocity ◽  
Point Gravity

In the last article we were concerned with finding the final velocity, being given the initial velocity, acceleration and the time. We did not consider the distance passed over during any interval of time.

Velocity Connection Algorithm of Arbitrary Multi-Axis Linkage

2017 ◽  
Vol 24 ◽  
pp. 12-23
Author(s):  
Fa Li Wang ◽  
Feng Ming Zhang ◽  
Lin Ge ◽  
Hui Ma
Keyword(s):  
Control System ◽  
Rapid Prototyping ◽  
Motion Control ◽  
Initial Velocity ◽  
High Speed ◽  
Stepper Motor ◽  
Final Velocity ◽  
Straight Line ◽  
Movement Mechanism ◽  
Current Segment

In this paper, a velocity connection algorithm of arbitrary multi-axis linkage is presented with regard to the problem of velocity connection efficiency of multiple straight-line paths in the motion control system. For this algorithm, with the velocity, acceleration and displacement of the current segment and the previous segment as constraint conditions, the acceleration is not set as a constant but the intersegmental velocity variable is set independently. The initial velocity and final velocity of each segment is solved on this basis, improving the movement efficiency and simplifying the calculation. Therefore, this algorithm is particularly suitable for the high-speed movement mechanism driven by a stepper motor. As for the actual motion track of the rapid prototyping machine, a comparison was made between this algorithm and the traditional velocity connection algorithm to verify the effectiveness of this algorithm.

scholarly journals The Analysis of Shuttlecock Velocity Based on the Field Test Method of The Home Industry Products in Indonesia

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Ucup Yusup ◽  
Agus Rusdiana
Keyword(s):  
Field Test ◽  
Initial Velocity ◽  
Field Tests ◽  
Test Method ◽  
Final Velocity ◽  
3D Motion Analysis ◽  
Analysis System ◽  
Main Components ◽  
Home Industries

One of the main components of badminton games is shuttlecock. The shuttlecock home industries in Indonesia mainly employ for about 20-40 freelance workers. The workers in the home industries are able to produce 500-100 slops of shuttlecock daily. The guarantee of the shuttlecock quality produced by home industries, either through the laboratory tests or field tests, is rarely conducted formally. Therefore, we are interested in conducting an academic study on the velocity of the shuttlecocks produced by the workers of the shuttlecock home industries that have been distributed in Indonesia markets. There are eight widely distributed shuttlecock brands produced by the home industries in Indonesia, including Taiso, Saporate, Netra, Arjuna, Kuda Mas, Rivals, Purnama, and Spin. The purpose of this study was to examine the quality of aerodynamics rate of the shuttlecock produced by home industries by comparing the rate of motion of the shuttlecock in different distances started from the initial velocity to the final velocity when the shuttlecocks impact to the ground. The method used in this study was a descriptive qualitative study. The instruments used were three high resolution handy cams, a set of calibration, and the 3D motion analysis system software (Frame Diaz IV). The result of this study showed that the average velocity of the shuttlecock, started from the initial velocity to the final velocity with 5 meter distance, reached 85.0 m/s., while the average final velocity reached 29.8m/s at 5 meter distance. From all of the shuttlecock types tested in the field test for their velocity, it was found that the Spin brand moved with a high velocity with 12.8% of percentage. Meanwhile, the lowest velocity of the shuttlecock was found in the Taiso brand where the percentage was 15.3% in 9 meter and12 meter distances. The study concludes that the average of various shuttlecock brands’ speeds are in the normal category except for the Taiso and Spin brands.

Study of Kynematics and Dynamics in the Traffic of Rembangan Tourism in the Jember Regency as Learning Resources for Physics Learning in the Senior High School

2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Alfido Fauzy Zakaria ◽  
Bambang Supriadi ◽  
Trapsilo Prihandono
Keyword(s):  
High School ◽  
School Teacher ◽  
High School Teacher ◽  
Senior High School ◽  
Circular Motion ◽  
Rectilinear Motion ◽  
Learning Resources ◽  
Physics Learning ◽  
Newton's Law ◽  
Newton’S Law

One branch of physics is mechanics. Based on interviews to Senior High School teacher in Jember, mechanics is difficult to learn. The eksternals factor this chapter is dificult to learn is learning Resources. The learning Resources are often less contextuall with around the phenomenon of students. The contextuall learning Resources in the Jember Regency is study of kynematics and dynamics in the traffic of Rembangan Tourism. From this experiment, we get data can be used as a learning resources chapter uniform rectilinear motion, decelerated uniform rectilinear motion, accelerated uniform rectilinear motion, Newton’s Law, and circular motion.

Elements method’s validation in order to determinate soybeans’ final velocity

2017 ◽  
Author(s):  
Rodolfo Lima ◽  
Manuel Osório Binelo ◽  
Oleg Khatchatourian ◽  
Saul Vione Winik ◽  
Ricardo Klein Lorenzoni
Keyword(s):  
Final Velocity

APPLICATION OF THE METHOD SPRINGY DEFORMATIONS OF BARREL DURING SHOT FOR DETERMINING THE INITIAL VELOCITY OF THE SHELL (MINE)

2019 ◽  
Vol 1 (12) ◽  
pp. 75-80
Author(s):  
Ye. Didenko ◽  
O. Stepanenko
Keyword(s):  
Strain Gauge ◽  
Initial Velocity ◽  
Radial Direction ◽  
Fire Control ◽  
Automatic Control Systems ◽  
Measurement Results ◽  
Initial Resistance ◽  
The Moment ◽  
The Many ◽  
Effective Use

One of the indicators of the effective use of artillery is the accuracy of the fire impact on the objects of enemy. The accuracy of the artillery is achieved by completing the implementation of all measures for the preparation of shooting and fire control. Main measures of ballistic preparation are to determine and take into account the summary deviation of the initial velocity. The existing procedure for determining the summary deviation of the initial velocity for the check (main) cannon of battery leads to accumulation of ballistic preparation errors. The supply of artillery units with means of determining the initial speed of the projectile is insufficient. Among the many known methods for measuring the initial velocity, not enough attention was paid to the methods of analyzing the processes that occur during a shot in the "charge-shell-barrel" system. Under the action of the pressure of the powder gases in the barrel channel and the forces of the interaction of the projectile with the barrel there are springy deformations in the radial direction. To measure springy deformations it is advisable to use strain gauge sensors. Monitoring of deformation in a radial direction by time can be used to determine the moment of passing a projectile past the strain gauge mounted on the outer surface of the barrel. In the case of springy deformations, the initial resistance of the sensor varies in proportion to its value. The speed of the shell (mine) in the barrel can be determined by time between pulses of signals obtained from strain gauges located at a known distance from each other. The simplicity of the proposed method for measuring the initial velocity of an artillery shell provides an opportunity for equipping each cannon (mortar) with autonomous means for measuring the initial velocity. With the simultaneous puting into action of automatic control systems can be automatically taking into account the measurement results. This will change the existing procedure for determining the total deviation of the initial velocity and improve the accuracy, timeliness and suddenness of the opening of artillery fire, which are components of its efficiency.

scholarly journals Full-Waveform Inversion for Imaging Faulted Structures: A Case Study from the Japan Trench Forearc Slope

2021 ◽  
Author(s):  
Ehsan Jamali Hondori ◽  
Chen Guo ◽  
Hitoshi Mikada ◽  
Jin-Oh Park
Keyword(s):  
Seismic Data ◽  
Initial Velocity ◽  
Waveform Inversion ◽  
Velocity Model ◽  
Control Measures ◽  
Japan Trench ◽  
Full Waveform Inversion ◽  
Full Waveform ◽  
Time Migration ◽  
Shallow Sediments

AbstractFull-waveform inversion (FWI) of limited-offset marine seismic data is a challenging task due to the lack of refracted energy and diving waves from the shallow sediments, which are fundamentally required to update the long-wavelength background velocity model in a tomographic fashion. When these events are absent, a reliable initial velocity model is necessary to ensure that the observed and simulated waveforms kinematically fit within an error of less than half a wavelength to protect the FWI iterative local optimization scheme from cycle skipping. We use a migration-based velocity analysis (MVA) method, including a combination of the layer-stripping approach and iterations of Kirchhoff prestack depth migration (KPSDM), to build an accurate initial velocity model for the FWI application on 2D seismic data with a maximum offset of 5.8 km. The data are acquired in the Japan Trench subduction zone, and we focus on the area where the shallow sediments overlying a highly reflective basement on top of the Cretaceous erosional unconformity are severely faulted and deformed. Despite the limited offsets available in the seismic data, our carefully designed workflow for data preconditioning, initial model building, and waveform inversion provides a velocity model that could improve the depth images down to almost 3.5 km. We present several quality control measures to assess the reliability of the resulting FWI model, including ray path illuminations, sensitivity kernels, reverse time migration (RTM) images, and KPSDM common image gathers. A direct comparison between the FWI and MVA velocity profiles reveals a sharp boundary at the Cretaceous basement interface, a feature that could not be observed in the MVA velocity model. The normal faults caused by the basal erosion of the upper plate in the study area reach the seafloor with evident subsidence of the shallow strata, implying that the faults are active.

scholarly journals Initial Velocity and Equilibrium Kinetics of Myokinase

1968 ◽  
Vol 243 (14) ◽  
pp. 3963-3972
Author(s):  
D G Rhoads ◽  
J M Lowenstein
Keyword(s):  
Initial Velocity ◽  
Kinetics Of

Velocity control algorithm in glass polishing based on the cubic NURBS curve

2017 ◽  
Vol 232 (4) ◽  
pp. 685-696 ◽  
Author(s):  
Junzhao Han ◽  
Wenhua Chen
Keyword(s):  
Control Algorithm ◽  
Linear Acceleration ◽  
Control Points ◽  
Velocity Control ◽  
Polishing Process ◽  
Nurbs Curve ◽  
Weighting Factors ◽  
Final Velocity ◽  
Contact Points ◽  
Glass Polishing

To limit velocity fluctuations and to achieve a controllable jerk value in a glass polishing process, a new velocity control algorithm is proposed based on nonuniform rational B-splines (NURBS). The key of this algorithm is replacing the traditional linear acceleration–deceleration with flexible NURBS acceleration–deceleration. Based on the linear acceleration–deceleration algorithm, the control points of the NURBS curve are confirmed, and the final velocity of the polishing wheel center is solved using the Preston equation. With jerk continuity and limitations of the servo system, nonlinear equations are constructed, and the weighting factors corresponding to the control points are obtained. Cubic velocity control equations can be derived from the obtained feature parameters, which include the final velocity, control points, weighting factors and knot vectors. Based on the proposed NURBS acceleration–deceleration algorithm, a fourth-order Runge–Kutta formula was used to obtain the initial points, and the Milne–Hamming equation was used to predict and correct the next point. The predictor-corrector interpolation algorithm for parametric trajectory was implemented during the polishing process. The experimental results indicate that the proposed approach guarantees limited fluctuations of the relative velocity at contact points and ensure smoother velocity changes at dangerous points.

scholarly journals Study on the initial velocity distribution of exhaled air from coughing and speaking

Chemosphere ◽  
2012 ◽  
Vol 87 (11) ◽  
pp. 1260-1264 ◽  
Author(s):  
Soon-Bark Kwon ◽  
Jaehyung Park ◽  
Jaeyoun Jang ◽  
Youngmin Cho ◽  
Duck-Shin Park ◽  
...  
Keyword(s):  
Velocity Distribution ◽  
Initial Velocity ◽  
Initial Velocity Distribution ◽  
Exhaled Air
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