scholarly journals Direct Drive Servovalves Actuated by Amplified Piezo-Stacks: Assessment through a Detailed Numerical Analysis

Actuators ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 156
Author(s):  
Paolo Tamburrano ◽  
Elia Distaso ◽  
Andrew R. Plummer ◽  
Francesco Sciatti ◽  
Pietro De Palma ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Response Speed ◽  
Fast Response ◽  
Step Response ◽  
Diamond Structure ◽  
Direct Drive ◽  
Low Weight ◽  
Mechanical Amplification ◽  
Amplification System ◽  
Linear Force

This paper presents a feasibility study using commercially available amplified piezo-stacks for the direct actuation of four-way three-position (4/3) direct drive servovalves. The prospect of using amplified piezo-stacks in place of linear force motors is very attractive by virtue of their fast response speed and low weight. Piezo-stacks equipped with mechanical amplification systems can give levels of displacement suitable for this application. A very effective amplification system has recently been produced by some manufacturers and is based on a temperature-independent diamond structure. This paper details simulations of a 4/3 servovalve directly actuated by such a piezoelectric actuator with a diamond structure. To this end, well-established equations, implemented in Simulink by means of the libraries of Simscape Fluids, are used. The proposed architecture shows simplicity of construction; in addition, very good step response speed and frequency response are predicted by the simulations.

scholarly journals Feasibility study of using amplified piezo-stack actuators for the actuation of direct drive servovalves

2020 ◽  
Vol 197 ◽  
pp. 07004
Author(s):  
Paolo Tamburrano ◽  
Pietro De Palma ◽  
Andrew R. Plummer ◽  
Elia Distaso ◽  
Riccardo Amirante
Keyword(s):  
Shear Force ◽  
Response Speed ◽  
Fast Response ◽  
Step Response ◽  
Direct Drive ◽  
Advantages And Disadvantages ◽  
Performance Predictions ◽  
Mechanical Amplification ◽  
Linear Force ◽  
Amplification Mechanism

In this paper, we investigate the idea of using, in place of recent linear force motors, amplified piezo-stack actuators for the actuation of direct drive servovalves, in order to exploit the fast response of piezoelements accompanied by the increased displacement ensured by mechanical amplification systems. Some possible architectures are proposed in this paper for the direct actuation of four-way three-position (4/3) servovalves using one or two commercially available amplified piezo-stack actuators having a diamond amplification mechanism. The simplest architecture, which employs only one actuator, is assessed using wellestablished equations implemented in Simulink, allowing the hydraulic, mechanical and electrical parts of the valve to be accurately simulated. Three spools of different size are considered in the simulations in order to obtain performance predictions for different valve flow ratings. From the analysis of the inherent characteristics of the amplified piezo-stack and from the results of the simulations, advantages and disadvantages of this possible architecture are drawn and discussed in detail. Among the advantages, there are the simplicity of construction and the high potential in terms of step response speed and frequency response; the large dimensions, low chip shear force capability and high costs are the main disadvantages.

Design and Simulation of Direct Drive Volume Control Actuator

2012 ◽  
Vol 155-156 ◽  
pp. 162-166
Author(s):  
Yang Yu ◽  
Bo Qiang Shi
Keyword(s):  
High Reliability ◽  
Low Frequency ◽  
Response Speed ◽  
Fast Response ◽  
Volume Control ◽  
Direct Drive ◽  
Hydraulic Actuator ◽  
High Control ◽  
Valve Control ◽  
Control Accuracy

The electro-hydraulic actuator which was designed based on the technology of the direct drive volume control, has the advantages of small volume, high reliability, energy saving and so on, and can effectively overcome the deficiency of traditional valve control electro-hydraulic actuator. This paper realizes co-simulation of direct drive volume control actuator (DDVCA) by using AMESim and Matlab/Simulink. The simulation results show that DDVCA has the characteristics of smooth operation, fast response speed, high control accuracy. Therefore, DDVCA can replace traditional servo valve electro-hydraulic actuator in the case of low frequency response requirement.

scholarly journals A Review of Novel Architectures of Servovalves Driven by Piezo-Electric Actuators

2021 ◽  
Author(s):  
Paolo Tamburrano ◽  
Francesco Sciatti ◽  
Andrew R. Plummer ◽  
Elia Distaso ◽  
Pietro De Palma ◽  
...  
Keyword(s):  
Piezoelectric Materials ◽  
Fast Response ◽  
Performance Parameters ◽  
Direct Drive ◽  
High Complexity ◽  
Large Size ◽  
Low Weight ◽  
Electric Materials ◽  
Actuation Systems ◽  
Piezo Electric

This paper is a thorough review of innovative architectures of electro-hydraulic servovalves that exploit actuation systems based on piezo-electric materials. The use of commercially available piezo-electric actuators, namely, piezo-stacks, amplified piezo-stacks, rectangular benders and ring benders, is very promising for the actuation of the main stages and of the pilot stages of servovalves, given the fast response and low weight of piezoelectric materials. The use of these actuators can also allow novel designs to be developed, thus helping manufacturers to overcome the typical drawbacks of commercial servovalves, such as the high complexity and the high internal leakage of the pilot stages of two stage servovalves, as well as the large size and weight of direct drive servovalves. Firstly, the piezoelectric actuators that can be used for driving servovalves are presented in the paper and their characteristics are thoroughly discussed. Then, the main novel architectures present in the literature are explained and compared with the commercial ones, and their performance parameters are discussed to draw conclusions on the prospect that some of these architectures can be used by manufacturers as future designs.

scholarly journals A Review of Novel Architectures of Servovalves Driven by Piezoelectric Actuators

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4858
Author(s):  
Paolo Tamburrano ◽  
Francesco Sciatti ◽  
Andrew R. Plummer ◽  
Elia Distaso ◽  
Pietro De Palma ◽  
...  
Keyword(s):  
Piezoelectric Materials ◽  
Piezoelectric Actuators ◽  
Fast Response ◽  
Direct Drive ◽  
High Complexity ◽  
Large Size ◽  
Low Weight ◽  
Electric Materials ◽  
Actuation Systems ◽  
Piezo Electric

This paper is a thorough review of innovative architectures of electro-hydraulic servovalves that exploit actuation systems based on piezo-electric materials. The use of commercially available piezo-electric actuators, namely, piezo stacks, amplified piezo stacks, rectangular benders, and ring benders, is very promising for the actuation of the main stages and of the pilot stages of servovalves given the fast response and low weight of piezoelectric materials. The use of these actuators can also allow novel designs to be developed, thus helping manufacturers to overcome the typical drawbacks of commercial servovalves, such as the high complexity and the high internal leakage of the pilot stages of two-stage servovalves as well as the large size and weight of direct-drive servovalves. First, the piezoelectric actuators that can be used for driving servovalves are presented in the paper, and their characteristics are thoroughly discussed. The main novel architectures present in the literature are then explained and compared with the commercial ones, and their performance parameters are discussed to draw conclusions on the prospect that some of these architectures can be used by manufacturers as future designs.

scholarly journals Tin Disulfide-Coated Microfiber for Humidity Sensing with Fast Response and High Sensitivity

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 648
Author(s):  
Aijie Liang ◽  
Jingyuan Ming ◽  
Wenguo Zhu ◽  
Heyuan Guan ◽  
Xinyang Han ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
Small Diameter ◽  
High Sensitivity ◽  
Large Change ◽  
Small Variation ◽  
Response Speed ◽  
Fast Response ◽  
Tin Disulfide ◽  
Recovery Times ◽  
Response And Recovery

Breath monitoring is significant in assessing human body conditions, such as cardiac and pulmonary symptoms. Optical fiber-based sensors have attracted much attention since they are immune to electromagnetic radiation, thus are safe for patients. Here, a microfiber (MF) humidity sensor is fabricated by coating tin disulfide (SnS2) nanosheets onto the surface of MF. The small diameter (~8 μm) and the long length (~5 mm) of the MF promise strong interaction between guiding light and SnS2. Thus, a small variation in the relative humidity (RH) will lead to a large change in optical transmitted power. A high RH sensitivity of 0.57 dB/%RH is therefore achieved. The response and recovery times are estimated to be 0.08 and 0.28 s, respectively. The high sensitivity and fast response speed enable our SnS2-MF sensor to monitor human breath in real time.

scholarly journals Self-Powered All-Inorganic Perovskite Photodetectors with Fast Response Speed

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Ting Zhang ◽  
Shibin Li
Keyword(s):  
High Performance ◽  
Solution Process ◽  
Response Speed ◽  
Fast Response ◽  
Single Step ◽  
Inorganic Perovskite ◽  
Perovskite Materials ◽  
Photoactive Materials ◽  
Self Powered ◽  
Solvent Processing

AbstractIn this manuscript, the inorganic perovskite CsPbI2Br and CsPbIBr2 are investigated as photoactive materials that offer higher stability than the organometal trihalide perovskite materials. The fabrication methods allow anti-solvent processing the CsPbIxBr3−x films, overcoming the poor film quality that always occur in a single-step solution process. The introduced diethyl ether in spin-coating process is demonstrated to be successful, and the effects of the anti-solvent on film quality are studied. The devices fabricated using the methods achieve high-performance, self-powered and the stabilized photodetectors show fast response speed. The results illustrate a great potential of all-inorganic CsPbIxBr3−x perovskites in visible photodetection and provide an effective way to achieve high performance devices with self-powered capability.

High performance self-powered CuZnS/GaN UV photodetectors with ultrahigh on/off ratio (3 × 108)

2021 ◽  
Vol 9 (14) ◽  
pp. 4799-4807
Author(s):  
Yong Zhang ◽  
Weidong Song
Keyword(s):  
Chemical Bath Deposition ◽  
High Performance ◽  
Response Speed ◽  
Fast Response ◽  
Uv Photodetector ◽  
Uv Photodetectors ◽  
Simple Chemical ◽  
Self Powered

P-CuZnS/n-GaN UV photodetector is prepared by a simple chemical bath deposition, showing excellent self-powered properties, including ultrahigh on/off ratio (3 × 108), fast response speed (0.14/40 ms) and large detectivity of 3 × 1013 Jones.

Design of Missile Autopilot with Aerodynamic Lift and Reaction Jets Based on Auto Disturbance Rejection Controller

2012 ◽  
Vol 472-475 ◽  
pp. 1036-1039
Author(s):  
Chong Yang ◽  
Ke Zhang ◽  
Mei Bai Lu
Keyword(s):  
Disturbance Rejection ◽  
Response Speed ◽  
Fast Response ◽  
Urgent Problem ◽  
Robust Performance ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Lateral Pulse Jet ◽  
Aerodynamic Lift ◽  
Pulse Jet

First a new autopilot design model is presented for the interceptor missile with the blended aerodynamic lift and reaction jet. The reaction jet can improve the response speed, but the structure of control system becomes more complex. Therefore how to design control strategy properly is an urgent problem. Second, considering the discrete property of the lateral pulse jet thrusters and the continuous property of the aerodynamic fins, a kind of ADRC (active disturbance rejection control) autopilot system was designed for the aerodynamic lift/reaction jet missile. Finally, through a testing in the simulation of MATLAB, it is shown that, due to the sufficient utilization of the reaction jet, there is a significant improvement in the fast response and robust performance of the proposed controller. It is applicable to design the autopilot of aerodynamic lift and reaction jet blended missile.

Vertical Channel Inorganic/Organic Hybrid Electrochemical Phototransistors with Ultrahigh Responsivity and Fast Response Speed

2021 ◽  
Vol 13 (6) ◽  
pp. 7498-7509
Author(s):  
Yujie Yan ◽  
Qizhen Chen ◽  
Xiumei Wang ◽  
Yaqian Liu ◽  
Rengjian Yu ◽  
...  
Keyword(s):  
Vertical Channel ◽  
Response Speed ◽  
Fast Response ◽  
Organic Hybrid
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