Modeling of a novel fan clutch pneumatic actuation system

2002 ◽  
Author(s):  
P. Kroeker ◽  
S. Habibi ◽  
R. Burton
Keyword(s):  
Pneumatic Actuation ◽  
Actuation System

A Controlled Pneumatic Actuation System

1965 ◽  
Author(s):  
Theodore T. Hadeler ◽  
Thomas P. Carey
Keyword(s):  
Pneumatic Actuation ◽  
Actuation System

Energy-Based Control of a Pneumatic Oscillator With Application to Energy Efficient Hopping Robots

2006 ◽  
Author(s):  
Yong Zhu ◽  
Eric J. Barth
Keyword(s):  
Energy Dissipation ◽  
Amplitude Control ◽  
Pneumatic Actuation ◽  
System A ◽  
Actuation System ◽  
Ideal System ◽  
Energetic Analysis ◽  
Control Methodology ◽  
Nonlinear Control Law ◽  
Vertical Case

This paper presents an energetically derived control methodology to specify and regulate the frequency and amplitude of oscillatory motion of a pneumatic actuation system. A lossless horizontal pneumatic actuation system with an inertia is energetically shown to represent an oscillator with a stiffness, and hence frequency, related to the equilibrium pressures in the actuator. Following from an analysis of the conservative energy storage elements in the system, a control methodology is derived to sustain a specified frequency and amplitude of oscillation in the presence of energy dissipation. The control strategy takes advantage of the natural passive dynamics of the system to provide much of the required actuation forces, while the remaining forces needed to overcome the energy dissipation present in a non-ideal system with losses are provided by a nonlinear control law for the charging and discharging of the actuator. This control methodology is demonstrated experimentally to provide accurate and repeatable frequency and amplitude control of oscillation in the presence of dissipative forces. Finally, the energetic analysis of the horizontal pneumatic system is extended to the vertical case where gravity is present. This extension provides an energetically efficient hopping control methodology for pneumatically actuated robots.

scholarly journals Occurrence Conditions of Stick-Slip in a Pneumatic Actuation System.

2002 ◽  
Vol 68 (669) ◽  
pp. 1363-1370
Author(s):  
Takahiro KOSAKI ◽  
Manabu SANO ◽  
Toshiharu KAGAWA
Keyword(s):  
Stick Slip ◽  
Pneumatic Actuation ◽  
Actuation System

Parameter Identification and Modeling of a Pneumatic Proportional Valve with Applicability in Control Design of Servo-Pneumatic Systems

2014 ◽  
Vol 658 ◽  
pp. 700-705 ◽  
Author(s):  
Ciprian Radu Rad ◽  
Olimpiu Hancu ◽  
Vistrian Maties ◽  
Ciprian Lapusan
Keyword(s):  
Parameter Identification ◽  
Flow Characteristic ◽  
Control Design ◽  
Control Valve ◽  
High Accuracy ◽  
Proportional Valve ◽  
Servo Systems ◽  
Positioning Control ◽  
Pneumatic Actuation ◽  
Actuation System

The key element in a servo-pneumatic actuation system is the control valve. This paper presents a method for parameter identification and modeling the flow characteristic of a FESTO MPYE-5-1/8-HF-101B proportional valve. An experimental setup and a procedure for parameter identification is presented in the paper. Simulation and experimental results are in agreement and the model of the valve could be used in high-accuracy positioning control design of pneumatic servo-systems.

Sizing Optimization of Pneumatic Actuation Systems Through Operating Point Analysis

2020 ◽  
Vol 143 (5) ◽  
Author(s):  
Vinícius Vigolo ◽  
Victor Juliano De Negri
Keyword(s):  
Energy Efficiency ◽  
Dynamic Performance ◽  
Operating Point ◽  
Pneumatic Actuation ◽  
Actuation System ◽  
Operating Region ◽  
Point Analysis ◽  
Dynamic Simulation Model ◽  
Good Energy ◽  
Actuation Systems

Abstract This paper reports a study on the static and dynamic behavior of pneumatic actuation systems, resulting in a comprehensive view of the influence of the system parameters on the energy efficiency and dynamic performance. The operating point approach based on the steady-state analysis of a pneumatic actuation system is used for developing analytical expressions to describe the relationship between the piston diameter and the system performance, including displacement time, stroke end velocity, and energy efficiency. The validity of the proposed equations is demonstrated by comparison with results from a test rig. Sensitivity analysis using a nonlinear dynamic simulation model indicated that a specific operating region exists, where good energy efficiency and the maximum dynamic performance are achieved. Moreover, the results show that an oversized system becomes more inefficient in both energetic and dynamic aspects. The results obtained provide a very consistent foundation for developing a method for pneumatic system sizing.

scholarly journals Pneumatically-Actuated Acoustic Metamaterials Based on Helmholtz Resonators

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1456 ◽  
Author(s):  
Reza Hedayati ◽  
Sandhya Lakshmanan
Keyword(s):  
Frequency Band ◽  
Open Space ◽  
Periodic Structures ◽  
Control Unit ◽  
Pressure Control ◽  
Sound Waves ◽  
Acoustic Metamaterials ◽  
Cavity Depth ◽  
Pneumatic Actuation ◽  
Actuation System

Metamaterials are periodic structures which offer physical properties not found in nature. Particularly, acoustic metamaterials can manipulate sound and elastic waves both spatially and spectrally in unpreceded ways. Acoustic metamaterials can generate arbitrary acoustic bandgaps by scattering sound waves, which is a superior property for insulation properties. In this study, one dimension of the resonators (depth of cavity) was altered by means of a pneumatic actuation system. To this end, metamaterial slabs were additively manufactured and connected to a proportional pressure control unit. The noise reduction performance of active acoustic metamaterials in closed- and open-space configurations was measured in different control conditions. The pneumatic actuation system was used to vary the pressure behind pistons inside each cell of the metamaterial, and as a result to vary the cavity depth of each unit cell. Two pressures were considered, P = 0.05 bar, which led to higher depth of the cavities, and P = 0.15 bar, which resulted in lower depth of cavities. The results showed that by changing the pressure from P = 0.05 (high cavity depth) to P = 0.15 (low cavity depth), the acoustic bandgap can be shifted from a frequency band of 150–350 Hz to a frequency band of 300–600 Hz. The pneumatically-actuated acoustical metamaterial gave a peak attenuation of 20 dB (at 500 Hz) in the closed system and 15 dB (at 500 Hz) in the open system. A step forward would be to tune different unit cells of the metamaterial with different pressure levels (and therefore different cavity depths) in order to target a broader range of frequencies.

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