A novel bi-directional deformable fluid actuator

2014 ◽  
Vol 228 (15) ◽  
pp. 2799-2809 ◽  
Author(s):  
Carlo Ferraresi ◽  
Walter Franco ◽  
Giuseppe Quaglia
Keyword(s):  
Mathematical Model ◽  
Internal Structure ◽  
Operating Principle ◽  
Original Shape ◽  
Pneumatic Muscles ◽  
Tensile Forces ◽  
Modelling Methodology ◽  
The Mathematical Model ◽  
Geometrical Dimensions ◽  
Different Levels

The deformable fluid actuators available on the market, i.e. pneumatic muscles and pneumatic springs, are designed to mainly exert compressive or tensile forces. This paper deals with a novel fluid deformable actuator, with three membranes, called BiFAc3, whose particular feature is the ability to exert both tensile and compressive forces. The structure of the actuator is based on three cylindrical coaxial nonisotropic membranes connected to two end plates, whose original shape allows the independent supply of the three internal chambers. The first part of the paper deals with the internal structure and the geometry of the actuator, describes the operating principle and presents a prototype. The second part presents a modelling methodology that can be used to design and analyse the actuator in dynamic applications. The mathematical model of the actuator is based on three different levels of complexity which correspond to three consecutive design stages. The model has been experimentally validated: it is a useful tool for the choice of the actuator’s geometrical dimensions, in order to satisfy specific applicative requirements.

scholarly journals Step-by-step control of target efficiency indices of the control and measuring equipment stock applied in construction and housing and communal services

2018 ◽  
Vol 170 ◽  
pp. 01010 ◽  
Author(s):  
Rustam Khayrullin ◽  
Pavel Ivanov
Keyword(s):  
Mathematical Model ◽  
Finite Difference ◽  
Measuring Equipment ◽  
Technical Condition ◽  
Measuring Instruments ◽  
Finite Difference Equations ◽  
Target Values ◽  
The Mathematical Model ◽  
Step Control ◽  
Different Levels

The mathematical model is considered for the formation and implementation of development strategies of the stock of control and measuring instruments (CMI) applied in construction and housing and communal services(HCS), and step-by-step control of efficiency target values of the stock. The model is based on a system of finite - difference equations describing the change of number of the CMI samples with different levels of technical perfection and technical condition at each planning interval. The model allows calculating the required number of CMI for procurement and repairs in the various groups for provide target values of efficiency indices at each planning interval. Controller is number of modern CMI samples for procurement and number of modern and obsolete faulty CMI samples for the repairs. The results of calculations are presented.

scholarly journals Tail-Actuator Propulsion Device for Aquatic Robot

2006 ◽  
Vol 18 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Andrea Manuello Bertetto ◽  
◽  
Maurizio Ruggiu
Keyword(s):  
Mathematical Model ◽  
Numerical Procedure ◽  
Numerical Data ◽  
Operating Principle ◽  
The Other ◽  
Kinematics And Dynamics ◽  
Experimental Characterization ◽  
Fish Propulsion ◽  
Geometrical Dimensions ◽  
Simplified Mathematical Model

In this paper an aquatic device inspired to the fish propulsion is proposed. At the first, the operating principle of the fluidic actuator and its experimental characterization are presented. Then, the results of numerous tests carried out on the integrated tail-actuator device are shown either in terms of thrust exerted or as biomorphism of its kinematics. The tests were run at several driven frequencies with different fins depending on their geometrical dimensions and compliances. On the other hand, a simplified mathematical model of the propulsion system, based on the calculation of the instantaneous tail kinematics and dynamics by means of a numerical procedure, is proposed with the aim of simulating performances either in terms of thrust exerted or kinematics behavior. Finally a discussion about the results obtained and a comparison between experimental and numerical data are presented.

Adsorption-Desorption Processes in Adsorption Chillers

2016 ◽  
Vol 20 (2) ◽  
pp. 81-89
Author(s):  
Monika Gwadera
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Mass Transfer ◽  
Experimental Studies ◽  
Operating Principle ◽  
Adsorption Desorption ◽  
The Mathematical Model

AbstractThe aim of this paper is to present the adsorption chillers technology. The operating principle of these systems, the adsorbent-adsorbate pairs that are frequently applied and the enhancement techniques that allow improvement of their efficiency are presented. Analysis of the mass transfer and principles of mathematical modeling of such systems are also discussed. In the further part of the text, the results of experimental studies and comparison of these results with calculations based on the mathematical model of adsorption were presented.

scholarly journals Modelling Methodology of Piston Pneumatic Air Engine Operation

2019 ◽  
Vol 13 (4) ◽  
pp. 271-278
Author(s):  
Dariusz Szpica ◽  
Michal Korbut
Keyword(s):  
Mathematical Model ◽  
Exhaust System ◽  
Compressed Air ◽  
System Control ◽  
Engine Operation ◽  
Air Supply ◽  
Mechanical Subsystem ◽  
Modelling Methodology ◽  
Lumped Elements ◽  
The Mathematical Model

Abstract The article presents a mathematical model describing the operation of a piston pneumatic air engine. Compressed air engines are an alternative to classic combustion solutions as they do not directly emit toxic exhaust components. In the study, a modified internal combustion piston engine was adopted as pneumatic engine. The mathematical model was divided on the two subsystems, that is, mechanical and pneumatic. The mechanical subsystem describes a transformation of compressed air supply process parameters to energy transferred to the piston and further the conversion of the translational to rotary motion; in turn, in the pneumatic part, the lumped elements method was used. Calculations were carried out using the Matlab-Simulink software, resulting in the characteristics of external and economic indicators. The presented mathematical model can be ultimately developed with additional elements, such as the intake or exhaust system, as well as timing system control.

The Elastic Behaviour of Metal Powder Compacts

2007 ◽  
Vol 534-536 ◽  
pp. 325-328
Author(s):  
Jose Manuel Prado
Keyword(s):  
Mathematical Model ◽  
Simple Model ◽  
Elastic Strain ◽  
Elastic Behaviour ◽  
Compression Tests ◽  
Linear Elastic ◽  
Loading And Unloading ◽  
Powder Compacts ◽  
The Mathematical Model ◽  
Different Levels

In this work the elastic behaviour of metallic powder compacts is studied. Cylindrical specimens with different levels of density have been submitted to uniaxial compression tests with loading and unloading cycles. The analysis of the elastic loadings shows a non linear elasticity which can be mathematically represented by means of a potential law. Results are explained by assuming that the total elastic strain is the contribution of two terms one deriving from the hertzian deformation of the contacts among particles and another that takes into account the linear elastic deformation of the powder skeleton. A simple model based in a one pore unit cell is presented to support the mathematical model.

scholarly journals Development of High-Sensitivity Piezoresistive Pressure Sensors for -0.5…+0.5 kPa

2021 ◽  
Author(s):  
Mikhail Basov ◽  
Denis Prigodskiy
Keyword(s):  
Mathematical Model ◽  
Pressure Sensors ◽  
Simulated Data ◽  
High Sensitivity ◽  
Silicon Membrane ◽  
Ultrahigh Sensitivity ◽  
Piezoresistive Pressure Sensors ◽  
The Mathematical Model ◽  
Geometrical Dimensions ◽  
Membrane Deflection

<p>A mathematical model of an ultrahigh sensitivity piezoresistive chip of a pressure sensor with a range from -0.5 to 0.5 kPa has been developed. The optimum geometrical dimensions of a specific silicon membrane with a combination of rigid islands to ensure a trade-off relationship between sensitivity (S<sub>samples</sub> = 34.5 mV/kPa/V) and nonlinearity (2K<sub>NL</sub> samples = 0.81 %FS) have been determined. The paper also studies the range of the membrane deflection and makes recommendations on position of stops limiting diaphragm deflection in both directions; the stops allow for increasing burst pressure P<sub>burst</sub> up to 450 кPa. The simulated data has been related to that of experimental samples and their comparative analysis showed the relevance of the mathematical model (estimated sensitivity and nonlinearity errors calculated on the basis of average values are 1.5% and 19%, respectively).</p>

scholarly journals Integrated mathematical model of competence-based learning-teaching process

2015 ◽  
Vol 63 (1) ◽  
pp. 245-259 ◽  
Author(s):  
P. Różewski ◽  
O. Zaikin
Keyword(s):  
Mathematical Model ◽  
Queuing Model ◽  
Teaching Process ◽  
Incentive Model ◽  
Ontological Approach ◽  
Qualification Framework ◽  
Open And Distance Learning ◽  
Motivation Model ◽  
The Mathematical Model ◽  
Different Levels

Abstract The competence-based learning-teaching process is a significant approach to the didactical process organization. In this paper the mathematical model of the competence-based learning-teaching process is proposed. The model integrates three models: a knowledge representation model (based on the ontological approach), a motivation model (as a behavioral-incentive model) and a servicing model (in a form of the queuing model). The proposed integrated model allows to control the learning-teaching process on different levels of management. The learning-teaching process can be interpreted as competence-based due to Open and Distance Learning (ODL) philosophy. We assume that the competence is a result of fundamental, procedural and project knowledge acquisition in accordance to the incoming European Qualification Framework.

Simulation Technologies for Tamper System of Asphalt-Paver Based on AMESim

2010 ◽  
Vol 129-131 ◽  
pp. 1098-1103 ◽  
Author(s):  
Tian Hong Luo ◽  
Xin Fu Gan ◽  
Wen Jun Luo
Keyword(s):  
Mathematical Model ◽  
Simulation Model ◽  
Pid Controller ◽  
Dynamic Performance ◽  
Operating Principle ◽  
Simulation Results ◽  
The Stability ◽  
The Mathematical Model

Tamper mechanism is one of the most important parts in all of Asphalt-pavers. In this article, the mathematical model of the tamper system has been established and the stability of the system has been analyzed by using Matlab. According to the operating principle of tamper system of Asphalt-paver, the simulation model of tamper system of Asphalt-paver has been established by using AMESim. The main parameters of the model were set, and then, the simulation results were analyzed, which show that the system is stable and the dynamic performance of system will be improved, when accumulator and PID controller were equipped. Besides, the tamping frequency of hammer is very important to the performance of system. When tamping frequency of hammer over 20HZ, the performance of system will go bad.

scholarly journals Development of High-Sensitivity Piezoresistive Pressure Sensors for -0.5…+0.5 kPa

2021 ◽  
Author(s):  
Mikhail Basov ◽  
Denis Prigodskiy
Keyword(s):  
Mathematical Model ◽  
Pressure Sensors ◽  
Simulated Data ◽  
High Sensitivity ◽  
Silicon Membrane ◽  
Ultrahigh Sensitivity ◽  
Piezoresistive Pressure Sensors ◽  
The Mathematical Model ◽  
Geometrical Dimensions ◽  
Membrane Deflection

Abstract A mathematical model of an ultrahigh sensitivity piezoresistive chip of a pressure sensor with a range from -0.5 to 0.5 kPa has been developed. The optimum geometrical dimensions of a specific silicon membrane with a combination of rigid islands to ensure a trade-off relationship between sensitivity (Ssamples = 34.5 mV/kPa/V) and nonlinearity (2KNL samples = 0.81 %FS) have been determined. The paper also studies the range of the membrane deflection and makes recommendations on position of stops limiting diaphragm deflection in both directions; the stops allow for increasing burst pressure Pburst up to 450 кPa. The simulated data has been related to that of experimental samples and their comparative analysis showed the relevance of the mathematical model (estimated sensitivity and nonlinearity errors calculated on the basis of average values are 1.5% and 19%, respectively).

scholarly journals Mathematical Modeling of Fault-Tolerance of the Information Systems

2019 ◽  
Vol 17 (4) ◽  
pp. 33-45
Author(s):  
A. I. Goleva ◽  
N. R. Storozhenko ◽  
V. I. Potapov ◽  
O. P. Shafeeva
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Information Systems ◽  
Fault Tolerance ◽  
Data Transmission ◽  
Probability Of Failure ◽  
Equipment Failures ◽  
Levels Of Functioning ◽  
The Mathematical Model ◽  
Different Levels

The article deals with the problem of reliability of information systems, in order to solve this problem, a method for assessing the fault tolerance of data transmission systems using the apparatus of mathematical modeling of faulttolerant systems with three levels of operation was introduced. Also the mathematical model in the form of a graph of states and the probability of failure with a system of differential equations for its description was formulated. The solution of mathematical model allows to obtain the probability of failure at different levels of functioning of information systems in order to detect and find faults and equipment failures.

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