Dynamic Characteristics of a Piezoelectric Transducer with Structural Damping

2013 ◽  
Vol 198 ◽  
pp. 633-638 ◽  
Author(s):  
Marek Płaczek
Keyword(s):  
Piezoelectric Transducer ◽  
Piezoelectric Materials ◽  
Research Centre ◽  
Structural Damping ◽  
Mechatronic Systems ◽  
Mathematical Algorithm ◽  
Analysis And Synthesis ◽  
The Matrix ◽  
Piezoelectric Stacks ◽  
Future Work

Work presents a proposal of an analysis method of the piezoelectric transducer. The considered system is a longitudinally vibrating single PZT plate. The main aim of this work is to designate characteristics of the considered PZT plate. Using constitutive equations of piezoelectric materials and an equation of the plates motion a matrix of characteristics of the system was obtained. Relations between mechanical and electrical parameters (forces, displacements, electric current and voltage) that describe behaviour of the system are included in the matrix of characteristics. A dynamic flexibility relation between the plates deformation and a force applied to the system is considered. A structural damping of the plates material was being taken into consideration and its influence on the plates dynamic flexibility is analysed. This work is an introduction to a task of analysis of complex systems. In future work the developed model and proposed mathematical algorithm will be used to analyse piezoelectric stacks. Non-classical methods will be used. It is a part of research works of Gliwice research centre related with an analysis and synthesis of mechanical and mechatronic systems [4-7,9,10,16-18]. Passive and active mechanical and mechatronic systems with piezoelectric transducers were analysed [1-3]. Works were also supported by computer-aided methods [8]. Both classical and non-classical methods were being considered. The discussed subject is important due to increasing number of applications of both simple and reverse piezoelectric phenomena in various modern technical devices.

The Mathematical Algorithm for Analysis of Piezoelectric Stacks with Structural Damping

2015 ◽  
Vol 220-221 ◽  
pp. 385-390
Author(s):  
Andrzej Buchacz ◽  
Marek Płaczek ◽  
Andrzej Wróbel
Keyword(s):  
Piezoelectric Materials ◽  
Piezoelectric Transducers ◽  
Structural Damping ◽  
Electrical Parameters ◽  
Mathematical Algorithm ◽  
System A ◽  
Effective Operation ◽  
The Matrix ◽  
Piezoelectric Stacks ◽  
Voigt Model

The work presents a proposal of mathematical algorithm developed for analysis of piezoelectric stacks that consist of classical PZT piezoelectric transducers. The considered systems vibrate longitudinally. Piezoelectric plates are combined in order to obtain multiplied displacement of the system and ensure more effective operation. Using constitutive equations of piezoelectric materials and an equation of the single plate’s motion, a matrix of characteristics of the system was obtained. The matrix of characteristics consists of relations between mechanical and electrical parameters (forces, displacements, electric current and voltage) that describe behaviour of the system. A structural damping of the plate’s material was being taken into consideration using Kelvin-Voigt model of material and its influence on the plate’s dynamic flexibility was analyzed [1, 2]. A dynamic flexibility – relation between the plate’s deformation and a force applied to the system is considered. Using the obtained dependences and non-classical methods, characteristics of piezoelectric stacks were designated and presented on charts. The obtained results were juxtaposed with characteristics of the system without structural damping.

Developing the basis of the matrix model of the regional innovation subsystem

2020 ◽  
Vol 18 (11) ◽  
pp. 2183-2204
Author(s):  
E.I. Moskvitina
Keyword(s):  
Russian Federation ◽  
Matrix Model ◽  
Federal District ◽  
Assessment Method ◽  
Expert Assessment ◽  
Regional Innovation ◽  
Regional Strategies ◽  
Analysis And Synthesis ◽  
The Matrix ◽  
The Russian Federation

Subject. This article deals with the issues related to the formation and implementation of the innovation capacity of the Russian Federation subjects. Objectives. The article aims to develop the organizational and methodological foundations for the formation of a model of the regional innovation subsystem. Methods. For the study, I used the methods of analysis and synthesis, economics and statistics analysis, and the expert assessment method. Results. The article presents a developed basis of the regional innovation subsystem matrix model. It helps determine the relationship between the subjects and the parameters of the regional innovation subsystem. To evaluate the indicators characterizing the selected parameters, the Volga Federal District regions are considered as a case study. The article defines the process of reconciliation of interests between the subjects of regional innovation. Conclusions. The results obtained can be used by regional executive bodies when developing regional strategies for the socio-economic advancement of the Russian Federation subjects.

Criteria for optimal operation of automobiles on alternative fuels

2021 ◽  
Vol 13 (1) ◽  
pp. 124-132
Author(s):  
Volodymyr Rudzinskyi ◽  
◽  
Bohdan Yemets ◽  
Serhii Melnychuk ◽  
Oleksandr Ryabchuk ◽  
...  
Keyword(s):  
Economic Efficiency ◽  
Alternative Fuels ◽  
Local Level ◽  
Optimal Operation ◽  
Expert Assessment ◽  
Depth Analysis ◽  
Analysis And Synthesis ◽  
The Matrix ◽  
Matrix Correlation ◽  
High Degree

The article deals with some criteria that substantiate the design and operational performance of automobiles running on alternative fuels; economic efficiency of operation of such vehicles, their ecological conformity; the level of complexity of the design of converted automobiles; labor intensity of their maintenance, repair, etc. ; traction-speed and other different, in comparison with the basic, properties of automobiles while working on alternative fuel (AF); energy consumption and (or) cost price of AF; efficiency of power plant and (or) car on AF; the degree of commissioning (mass production) and further prospects for the development of the design of such automobiles; state of support developed structures at the national (local) level. An expert assessment of the adopted criteria in the order of their importance is made. Along with the analysis of scores, which are presented in points, it is used the ranking method to study the results of the survey of experts. This allows applying the values of the established optimal criteria to justify the operation of vehicles during their work on the AF. The analysis of the matrix correlation shows that the numerical estimates set by the accepted criteria are characterized by a high degree of correlation, and experts are generally unanimous in assessing their importance. The most important criteria for the operation of automobiles on the AF are economic efficiency, traction and speed and other, different compared to the basic, the properties of automobiles while working on the AF. Other criteria are also quite important, the weights for them are much higher than 7%, and they also should be taken into account while conducting an in-depth analysis and synthesis of indicators of optimal operation of automobiles on the AF. In addition, it is important that the group of criteria that characterize only one type of automobile when working on the AF (for example, the degree of commissioning) experts gave only about 17% of the importance.

scholarly journals Systemic Puppet Therapy in Rehabilitation Practice

2020 ◽  
Vol 99 (5) ◽  
pp. 88-93
Author(s):  
O.A. Lanberg ◽  
L.G. Khayet ◽  
T.V. Kadinskaya
Keyword(s):  
Research Centre ◽  
Face To Face ◽  
National Medical ◽  
Resource Search ◽  
Wide Range ◽  
Analysis And Synthesis ◽  
Scope Of Application ◽  
Puppet Therapy ◽  
Psychological Assistance ◽  
Intellectual Level

The concept of systemic puppet therapy proposed by the authors is described. Therapeutic work with puppets is a promising method of psychological assistance as part of rehabilitation processes. Its insufficient use is due to its low structurality. The phased application of morphological analysis and synthesis made it possible to streamline the known and develop new effective methods of puppet therapy. The proposed systemic puppet therapy is an ordered polymodal set of static (lining on the table or on the floor of a puppet arranged set) and dynamic (presenting history on behalf of the puppet or staging a performance) methods, individual and group methods, face-to-face and remote forms of work, algorithms for their choice.The size, material and design of puppets, quantitative and qualitative composition of their therapeutic set are justified. Methods of puppet therapy of different degree of structuring and depth of exposure for patients with different level of intelligence are described, including category and scope of application of the technique, instructions to the patient, plan of results discussion,transformation procedure providing therapeutic effect. Implementing a polymodal approach, after working with puppets, patients painted, composed and analysed works of literature andart. The field of puppet therapy intersected with the fields of drama-, mask- and art therapy, body-oriented and verbal therapy, psychodrama and system arrangements. Puppet therapy content included work with feelings and emotions, with the process of communication and social roles, with verbal and non-verbal diagnostics and self-diagnostics, with personal features and a system of relationships,with values and needs, with existential problems of patients. Systemic puppet therapy is applicable to a wide range of nosological categories, therapeutic situations, physical condition, intellectual level, gender and age characteristics of patients.The conditions and examples of application of techniques in the National Medical Research Centre of Rehabilitation and Balneology with the tasks of correcting unproductive attitudes and the system of patient relations, correcting perceptions of oneself; capacity-building and resource search; development of a compliance installation and active participation in rehabilitation are given.

Demonstrating the Generation of Bond Graphs From 3D Assemblies

2020 ◽  
Author(s):  
Corey J. Alicchio ◽  
Justin S. Vitiello ◽  
Pradeep Radhakrishnan
Keyword(s):  
Bond Graph ◽  
Dynamic Responses ◽  
Bond Graphs ◽  
Mechatronic Systems ◽  
3D Cad ◽  
Related Information ◽  
Grammar Rules ◽  
Gear Trains ◽  
System Graph ◽  
Future Work

Abstract The bond graph method provides a generic and simple way to compute differential equations and dynamic responses for complex mechatronic systems. This paper will illustrate the process of automatically generating bond graphs from 3D CAD assemblies of gear-trains. Using appropriate CAD application programming interfaces (APIs), information on parts and mates within an existing assembly is extracted. The extracted information is stored as an identity graph, which also stores all geometry and mass related information of every part. Grammar rules are then used to transform the identity graph to a system graph, which is then converted to bond graph using an existing bond graph generation program. The paper will discuss the process, challenges and planned future work.

Analyzing the response to epidemics: concept of evidence-based Haddon matrix

2017 ◽  
Vol 7 (3) ◽  
pp. 266-283 ◽  
Author(s):  
Azrah Anparasan ◽  
Miguel Lejeune
Keyword(s):  
Physical Environment ◽  
Evidence Based ◽  
Research Directions ◽  
Content Type ◽  
Humanitarian Organizations ◽  
The Matrix ◽  
New Research ◽  
Future Work ◽  
Haddon Matrix

Purpose The purpose of this paper is to propose a novel evidence-based Haddon matrix that identifies intervention options for organizations and governments responding to an epidemic in a developing economy. Design/methodology/approach A literature review of articles published within a year of the cholera outbreak in Haiti. Two separate types of literature sources are used – academic and non-academic – to apprehend the value and role of interventions implemented and/or identified. Findings The Haddon matrix helps break down the challenges involved in the containment of an epidemic into smaller, manageable components. This research shows that the matrix enables visualization of past evidence, help dissect various informational sources, and increase collaboration across humanitarian organizations. It will also serve as a building block for academics to identify new research directions to respond to epidemic outbreaks. Research limitations/implications The analysis focuses on the cholera epidemic in Haiti. Future work will be directed to generalize the identified recommendations and insights to a broader context. Originality/value This paper presents an evidence-based Haddon matrix that infers recommendations and insights based on past evidence for each phase (pre-event, response, and post-event) and factor (agent, host, physical environment, and socio-cultural environment) of an epidemic and for various stakeholders (humanitarian organizations, governments, and academics). The matrix provides a structured framework to identify interventions and best practices to address challenges during an epidemic outbreak.

scholarly journals Piezoelectric Transducer-Based Structural Health Monitoring for Aircraft Applications

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 545 ◽  
Author(s):  
Xinlin Qing ◽  
Wenzhuo Li ◽  
Yishou Wang ◽  
Hu Sun
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Piezoelectric Transducer ◽  
Piezoelectric Materials ◽  
Development Trend ◽  
Practical Implementation ◽  
Damage State ◽  
Structural Health ◽  
Safety And Reliability ◽  
Aircraft Application

Structural health monitoring (SHM) is being widely evaluated by the aerospace industry as a method to improve the safety and reliability of aircraft structures and also reduce operational cost. Built-in sensor networks on an aircraft structure can provide crucial information regarding the condition, damage state and/or service environment of the structure. Among the various types of transducers used for SHM, piezoelectric materials are widely used because they can be employed as either actuators or sensors due to their piezoelectric effect and vice versa. This paper provides a brief overview of piezoelectric transducer-based SHM system technology developed for aircraft applications in the past two decades. The requirements for practical implementation and use of structural health monitoring systems in aircraft application are then introduced. State-of-the-art techniques for solving some practical issues, such as sensor network integration, scalability to large structures, reliability and effect of environmental conditions, robust damage detection and quantification are discussed. Development trend of SHM technology is also discussed.

scholarly journals Open Plant Phenotype Database of Common Weeds in Denmark

2020 ◽  
Vol 12 (8) ◽  
pp. 1246 ◽  
Author(s):  
Simon Leminen Madsen ◽  
Solvejg Kopp Mathiassen ◽  
Mads Dyrmann ◽  
Morten Stigaard Laursen ◽  
Laura-Carlota Paz ◽  
...  
Keyword(s):  
Plant Species ◽  
Growth Conditions ◽  
Research Centre ◽  
Species Classification ◽  
Visual Appearance ◽  
Plant Phenotype ◽  
Rgb Images ◽  
The Individual ◽  
High Degree ◽  
Future Work

For decades, significant effort has been put into the development of plant detection and classification algorithms. However, it has been difficult to compare the performance of the different algorithms, due to the lack of a common testbed, such as a public available annotated reference dataset. In this paper, we present the Open Plant Phenotype Database (OPPD), a public dataset for plant detection and plant classification. The dataset contains 7590 RGB images of 47 plant species. Each species is cultivated under three different growth conditions, to provide a high degree of diversity in terms of visual appearance. The images are collected at the semifield area at Aarhus University, Research Centre Flakkebjerg, Denmark, using a customized data acquisition platform that provides well-illuminated images with a ground resolution of ∼6.6 px mm − 1 . All images are annotated with plant species using the EPPO encoding system, bounding box annotations for detection and extraction of individual plants, applied growth conditions and time passed since seeding. Additionally, the individual plants have been tracked temporally and given unique IDs. The dataset is accompanied by two experiments for: (1) plant instance detection and (2) plant species classification. The experiments introduce evaluation metrics and methods for the two tasks and provide baselines for future work on the data.

Sliding mode observer based hysteresis compensation control for piezoelectric stacks

2020 ◽  
Vol 42 (14) ◽  
pp. 2760-2770
Author(s):  
Jiaming Hu ◽  
Xiaojin Zhu ◽  
Yubin Fang ◽  
Zhiyuan Gao ◽  
Yijia Zhou
Keyword(s):  
Sliding Mode ◽  
Piezoelectric Materials ◽  
External Disturbance ◽  
Linear Matrix ◽  
Observation Error ◽  
Hysteresis Compensation ◽  
Compensation Control ◽  
Hysteretic Effect ◽  
Practical Engineering ◽  
Piezoelectric Stacks

Piezoelectric stacks (PS) are wildly used as actuator mechanism for precise instrument in practical engineering. Nevertheless, hysteretic effect that is carried by the piezoelectric materials can degrade the control performance dramatically. For the purpose of improving the control precision, the problem of hysteresis compensation control for PS system is investigated in this paper. First, in order to compensate the hysteretic effect, two kinds of observers are proposed. The design of the observers has considered external disturbance and the creep effect in PS system. By utilizing Lyapunov function and linear matrix inequalities (LMI) technique, the observers can asymptotically estimate the hysteretic output with [Formula: see text] performance. Second, a hysteresis-compensation based back-stepping controller is established. The design of the controller has considered the observation error, and it has a certain robustness. At last, numerical and experimental simulations are carried out to verify the effectiveness of the proposed methods.

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