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Linear motion
Published in Paul Grimshaw, Michael Cole, Adrian Burden, Neil Fowler, Instant Notes in Sport and Exercise Biomechanics, 2019
Human movement can often be classified into components of linear and angular motion. This leads to a description that is termed general motion. Linear motion (or translation) is movement along a line which may be either straight or curved and where all the body parts are moving in the same direction at the same speed. This can be classified as either rectilinear motion (motion along a straight line) or curvilinear motion (motion along a curved line). Angular motion (discussed elsewhere in this text) involves movement around an axis (either imaginary or real) with body parts (or individual body parts) moving through angles (the same or different angles) in a certain time frame (Figure A1.2).
Physical Motion
Published in Alfred T. Lee, Vehicle Simulation, 2017
There are three principal axes of earth-referenced motion: (1) longitudinal (or X-axis), (2) vertical (or Z-axis), and (3) lateral (or Y-axis). Along these three axes of motion, there are two possible types of motion: (1) rotational or angular motion and (2) translational or linear motion (Figure 3.1). In general, vehicle motion can occur in any of these six degrees of freedom (DOF) and will often occur in more than one axis at a time. The human vestibular system is responsive to each of these six axes at any given time.
Dynamics
Published in Keith L. Richards, Design Engineer's Sourcebook, 2017
Rectilinear motion (also known as linear motion) is motion in one direction only, that is, along a straight line and can be described mathematically as having one spatial dimension. The motion can be of two types:Uniform linear motion with a constant velocity (or zero acceleration)Non-linear motion with a variable velocity (or non-zero acceleration)
Control analysis and experimental investigation of a multi-coil moving coil linear motor based on an improved bacterial foraging algorithm
Published in Systems Science & Control Engineering, 2018
Gong Zhang, Zheng Xu, Zhichen Hou, Qunxu Lin, Jimin Liang, Songsong Liang, Jian Wang, Youhao Li, Weijun Wang
A linear motor (LM), converting the electromagnetic energy into mechanical energy reciprocating linear motion continuously and proportionally, is regarded as the most widely employed linear motion mechanism in various industry driving fields. Basically, it could be classified into moving iron linear motor (MILM) and moving coil linear motor (MCLM) by the moving part (Goll & Kronmuller, 2000; Takezawa et al., 1998). At present, an MCLM is receiving increased attention for use in applications requiring linear motion at high speed and high accuracy for its smaller hysteresis and higher linearity (George & William, 2000; Ruan, 2013; Zhao & Tan, 2005). The generated electromagnetic force is about 1.5 times higher than the others with the same size (Tanaka, 2000; Zhang, Yu, & Ke, 2007).
Comparison of musculoskeletal load using two devices for manual height adjustment of the hospital bed
Published in International Journal of Occupational Safety and Ergonomics, 2022
Sanpatchaya Sirisawasd, Sasitorn Taptagaporn, Chaweewon Boonshuyar, Poramet Earde
Mechanical and hydraulic devices are known as a linear actuator commonly used to achieve linear motion, such as electric current, hydraulic fluid pressure or pneumatic pressure, and convert that energy into some kind of linear motion. Linear actuators give a very smooth and stable movement of the height adjustment, and the possibility to design a better user control method for the convenience of use, but are a very expensive technology [18]. Malujda et al. [17] also used the concept of linear actuators to develop an all-new mechanism of height adjustment for the hospital bed. It was confirmed that linear actuators were not suitable to be applied in this study.