45 research outputs found
Damping identification sensitivity in flutter speed estimation
No full textData supporting this study (− method MATLAB implementation) are openly available from the Zenodo Repository at https://doi.org/10.5281/zenodo.15176140. Furthermore, this study used existing authors’ data made available under licence at https://doi.org/10.5281/zenodo.11635814 and derived from the following resource available in the public domain: [11].Predicting flutter remains a key challenge in aeroelastic research, with certain models relying on modal parameters, such as natural frequencies and damping ratios. These models are particularly useful in early design stages or for the development of small Unmanned Aerial Vehicles (maximum take-off mass below 7 kg). This study evaluates two frequency-domain system identification methods, Fast Relaxed Vector Fitting (FRVF) and the Loewner Framework (LF), for predicting the flutter onset speed of a flexible wing model. Both methods are applied to extract modal parameters from Ground Vibration Testing data, which are subsequently used to develop a reduced-order model with two degrees of freedom. The results indicate that FRVF- and LF-informed models provide reliable flutter speed, with predictions deviating by no more than 3% (FRVF) and 5% (LF) from the N4SID-informed benchmark. The findings highlight the sensitivity of flutter speed predictions to damping ratio identification accuracy and demonstrate the potential of these methods as computationally efficient alternatives for preliminary aeroelastic assessments.Engineering and Physical Sciences Research Council (EPSRC)The authors from Cranfield University disclosed receipt of the following financial support for the research, authorship, and/or publication of this article. This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) [grant number 2277626]. The third author is supported by the Centro Nazionale per la Mobilità Sostenibile (MOST–Sustainable Mobility Center), Spoke 7 (Cooperative Connected and Automated Mobility and Smart Infrastructures), Work Package 4 (Resilience of Networks, Structural Health Monitoring and Asset Management).Vibratio
Modified Algorithm for the Analysis of Thin Plates by the Finite Element Method in the Form of the Classical Mixed Method
No full textAbstractAccounting for the effect of the rigid body motion of a finite element is one of the most challenging problems in approximating displacements in the Finite Element Method (FEM). In this paper with the example of the rectangular plate element with 12 degrees of freedom it is demonstrated how to eliminate all components of nodal linear and angular displacements of the finite element relatively to its displacements as a rigid body. Based on this explicit analytical procedure, the system of governing equations of the FEM in the form of a classical mixed method is elaborated, in which all displacements related to the rigid body motion are eliminated
On the Efficiency of the Finite Element Method in the Form of the Classical Mixed Method
No full textAbstractThis paper presents the arguments for the efficiency of the Finite Element Method in the form of the classical mixed method being developed by the authors. The example of a bended plate shows that the system of governing equations of the FEM in this form has the same order as the system of equations of the FEM in displacements. The analysis algorithm is similar to that of the analysis by the FEM in displacements. Since the primary unknowns include both displacements and forces, the analysis returns the values of nodal deflections and bending moments. Test example illustrates good convergence of the numerical results to the exact solution. The further development of this form of the FEM as an alternative to the FEM in displacements is recommended
Analysis of Systems with Unilateral Constraints through the Finite Element Method in the Form of a Classical Mixed Method
No full textAbstractThe paper gives an algorithm for the analysis of systems with unilateral constraints through the finite element method in the form of a classical mixed method. Given that both displacements and forces are variables in the system of governing equations, the procedure for the incremental parametric loading as a part of the analysis of structurally nonlinear systems allows varying the respective parameter, tending from «hard» loading based on the load parameter towards «soft» loading based on the displacement (configuration) parameter. The efficiency of the algorithm is shown by the example of a beam with unilateral constraints
DECONSTRUCTION OF THE SOCIAL REALITY IN THE INFORMATION-QUANTUM RESONANCE
No full textThe relationship between social transformation and growth of information flows is examined. The effect of informational resonance is revealed and analyzed. The reasons of information ontology of modern society are identified. The mechanism of mutation of social action is revealed and analyzed. The author substantiates the statement that information explosion puts social systematic destruction. The everyday life structures immerse individuals into space of constructed alternatives to social reality. The author argues that the individualized society is becoming a reality and is acquiring a character of the «quantified social reality ». The possibility to use quantum paradigm approach in the version «of states relativity» by H. Everet in social theory is considered. The «Shadow» social actions are interpreted as hidden shadow connotations
Evolution of management of local development processes (on the example of Bagrationovsky district of the Kaliningrad region)
No full textThe purpose of the study is to develop a potential mechanism for monitoring and motivating municipal authorities, based on the evolution of management of development processes. The paper describes the positive experience of management of local development processes on the example of the Bagrationovsky urban settlement, whose administration actively interacted with the pharmaceutical company “Infamed-K” located in Bagrationovsk. As a result, it was possible not only to ensure the participation of the settlement in various regional and federal programs on co-financing terms, fully pay off the past due debt that has occurred earlier, but also create a favorable living environment and solve many problems of the residents
In the Ensemble with Technical Subjects
No full textIntroduction. The purpose of the paper is to test the hypothesis about the entry into the social interactions of actors of a special kind - devices with artificial intelligence. The author proposes to discuss a hypothesis about the emergence of a new species of a subject of artificial nature. The concept is based on the concepts developed by the author of a technosubject and a new kind of subjectivity. The character of a new type of interaction agent is analyzed, its varieties are revealed.Methodology and sources. When identifying signs of similarity between human and machine subjectivity, the author proceeds from interpretations of the subject and subjectivity in the works of G. Tononi, M. DeLanda, G. Deleuze, F. Guattari, S. Beskaravayny. The sources are the studies of T. Walsh, R. Brooks, D. Jordan, D. Markoff, R. Jonck, R. Kurzweil, A. Greenfield, K. Kelly, Sh. Turkle. The results of experiments on the construction of the social community of robots at the Kurchatov Institute and the Institute of Robotics at Carnegie Mellon University, the results of sociological studies of the nature of human relationships with robots carried out by Sherry Turkle from Massachusetts Institute of Technology are taken into account.Results and discussion. It is proved that human interaction with a techno-subject forms a special type of sociality - a hybrid society. The mechanism and features of social interactions in a hybrid type of society are revealed. The specificity of inter-actions arising between a person and various types of techno-subject is revealed. The process of the occurrence and occurrence of human anthropomorphic reactions to the activity of robots is analyzed. There is a transition from copying anthropomorphic features to devices with artificial intelligence to the formation of their subjectivity. The options for constructing human relationships with robots are considered.Conclusion. The conclusion is drawn that there is a high degree of likelihood of an increase in the future conflict between the two lines of improvement of androids based on the creation of a universal humanoid intelligence: strengthening or replacing a person. An alternative possibility of the third direction is considered: harmonization of relations between participants in a hybrid society
Changes in the Provision of Institutionalized Mental Health Care in Post-Communist Countries
No full textPMCID: PMC3371010This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Did female prisoners with mental disorders receive psychiatric treatment before imprisonment?
No full text© 2015 Mundt et al.; licensee BioMed Central. This is an Open Access article distributed under the terms of the Creative
Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and
reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain
Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article,
unless otherwise stated.BackgroundThroughout the world, high prevalence rates of mental disorders have been found in prison populations, especially in females. It has been suggested that these populations do not access psychiatric treatment. The aim of this study was to establish rates of psychiatric in- and outpatient treatments prior to imprisonment in female prisoners and to explore reasons for discontinuation of such treatments.Methods150 consecutively admitted female prisoners were interviewed in Berlin, Germany. Socio-demographic characteristics, mental disorders, and previous psychiatric in- and outpatient treatments were assessed by trained researchers. Open questions were used to explore reasons for ending previous psychiatric treatment.ResultsA vast majority of 99 prisoners (66%; 95% CI: 58¿73) of the total sample reported that they had previously been in psychiatric treatment, 80 (53%; 95 CI: 45¿61) in inpatient treatment, 62 (41%; 95 CI: 34¿49) in outpatient treatment and 42 (29%; 21¿39) in both in- and outpatient treatments. All prisoners with psychosis and 72% of the ones with any lifetime mental health disorder had been in previous treatment. The number of inpatient treatments and imprisonments were positively correlated (rho¿=¿0.27; p¿<¿0.01). Inpatient treatment was described as successfully completed by 56% (N¿=¿41) of those having given reasons for ending such treatment, whilst various reasons were reported for prematurely ending outpatient treatments.ConclusionThe data do not support the notion of a general `mental health treatment gap¿ in female prisoners. Although inpatient care is often successfully completed, repeated inpatient treatments are not linked with fewer imprisonments. Improved transition from inpatient to outpatient treatment and services that engage female prisoners to sustained outpatient treatments are needed
