China
Africa
Explore chapters and articles related to this topic
Prototyping of automated systems
Published in Fuewen Frank Liou, Rapid Prototyping and Engineering Applications, 2019
Note that although cylinders are mainly used for linear motion, there are options for rotary actuators. Two types of rotary actuators are often used: the vane rotary actuator and rack and pinion gear to translate linear motion to rotary motion.
Modeling and dynamic analysis of a robotic arm with pneumatic artificial muscle by transfer matrix method
Published in Mechanics Based Design of Structures and Machines, 2023
Mahdi Bamdad, Mahdi Feyzollahzadeh, S. Rahi Safavi
The actuators of the mechanism can be modeled with an equivalent spring and a motion. In this case, the equivalent spring indicates the mechanical flexibility of the actuator. For example, in a DC motor, the equivalent spring shows the shaft’s and the gear’s flexibility, and the motion represents the rotation of the output shaft (Krauss 2014). The rotary actuator is modeled with a torsional spring and a rotation angle. The linear actuator is also modeled with a linear motion and a linear spring. In addition, the movement of the actuator according to the type of system can be calculated as follows: where GPD is a constant for the actuator, G(t) is actuator movement, and u is the system input. For example, in the electrical motor, u is the input voltage (Krauss 2014). By determining the function G(t) and the equivalent spring, the transfer matrix for the linear and rotational actuator can be determined as follows: where Uθ is the rotational actuator transfer matrix, kθ is the rotational actuator equivalent spring, Ux is the linear actuator transfer matrix, and kx is the equivalent spring of the linear actuator.
A novel hydraulic balanced turbine for stability control and application in drilling tools
Published in Engineering Applications of Computational Fluid Mechanics, 2022
Jin Wang, Qilong Xue, Leilei Huang, Fangtao Li, Baolin Liu, Yang Chen
In general, most of the turbine designs (Tengs et al., 2018) in the reviewed literature are based on the continuously rotating turbine structure. Modern computational resources allow computational fluid dynamics (CFD) to be an integral part of turbine design. A vast amount of research has been carried out on the numerical simulation of hydraulic turbines. Position control during rotary motion (Moghadam et al., 2019) is not difficult for electromechanical systems. Using a rotary position sensor (Bajic et al., 2014), which is an essential component, and a stepper motor or servo-hydraulic rotary actuator (Sadeghieh et al., 2012), we can achieve precise control. However, in some special applications, such as petroleum drilling (Jones et al., 2016), the nuclear industry (Huang et al., 2018) and lunar drilling (Koemle et al., 2008), electronic components are not adaptable because the control system is usually required to work at temperatures exceeding 200°C, which exceed the limits of most electronic components.
Trends in hydraulic actuators and components in legged and tough robots: a review
Published in Advanced Robotics, 2018
Koichi Suzumori, Ahmad Athif Faudzi
For heavy crane and ship anchor winding applications, piston motor is normally used as the amount of torque supplied is higher, while robotics application like the robotic hand applies the vane rotary actuator. Kusakabe et al. developed vane rotary actuator with JPN Co. Ltd with input pressure of 35 MPa while most of the conventional motors only applied 21 MPa for the actuation [71]. The latest research aims to develop rotary actuator up to 330° at 35 MPa. The actuator was used for a robotic hand [80] that could grip and manipulate objects [71] which would be part of ImPACT project on as mentioned in Section 2.1. HyQ [88] and MiniHyQ [89] robot also apply rotary actuator in the leg mechanism using DS Dynatec parts.