Dynamical System Visualization and Analysis Via Performance Maps

2004 ◽  
Vol 3 (4) ◽  
pp. 271-287 ◽  
Author(s):  
James J. Alpigini

Visualization techniques are common in the study of chaotic motion. These techniques range from simple time graphs and phase portraits to robust Julia sets, which are familiar to many as ‘fractal images.’ The utility of the Julia sets rests not in their considerable visual impact, but rather, in the color-coded information that they display about the dynamics of an iterated function. In this paper, a paradigm termed the performance map is presented, which is derived from the familiar Julia set. Performance maps are generated automatically for control or other dynamical system models over ranges of system parameters. The resulting visualizations require a minimum of a priori knowledge of the system under evaluation. By the use of color-coding, these images convey a wealth of information to the informed user about dynamic behaviors of a system that may be hidden from all but the expert analyst.

2021 ◽  
pp. 1-17
Author(s):  
KRZYSZTOF LECH ◽  
ANNA ZDUNIK

Abstract For a sequence of complex parameters $(c_n)$ we consider the composition of functions $f_{c_n} (z) = z^2 + c_n$ , the non-autonomous version of the classical quadratic dynamical system. The definitions of Julia and Fatou sets are naturally generalized to this setting. We answer a question posed by Brück, Büger and Reitz, whether the Julia set for such a sequence is almost always totally disconnected, if the values $c_n$ are chosen randomly from a large disc. Our proof is easily generalized to answer a lot of other related questions regarding typical connectivity of the random Julia set. In fact we prove the statement for a much larger family of sets than just discs; in particular if one picks $c_n$ randomly from the main cardioid of the Mandelbrot set, then the Julia set is still almost always totally disconnected.


Jurnal MIPA ◽  
2017 ◽  
Vol 6 (2) ◽  
pp. 81
Author(s):  
Riskika Fauziah Kodri ◽  
Jullia Titaley

Batik adalah corak atau gambar (pada kain) yang pengolahannya diproses dengan cara tertentu biasanya dengan menerakan malam yaitu sejenis lilin pada kain. Batik Minahasa merupakan batik yang menggunakan motif tradisional atau ragam hias dari tanah adat Minahasa, Sulawesi Utara, Indonesia. Batik menjadi warisan budaya Indonesia salah satunya karena motif pada batik yang mengandung filosofi kehidupan masyarakat setempat. Variasi motif pola batik minahasa belum terlalu berkembang walaupun telah ada variasi dari penggabungan motif-motif asli batik Minahasa. Matematika memperkenalkan bentuk fraktal yang memiliki sifat keserupaan diri dan banyak dijumpai pada objek di dunia nyata. Julia Set adalah salah satu jenis fraktal yaitu yang berkaitan dengan bilangan kompleks dan dibangkitkan dari fungsi teriterasi . Tujuan penelitian ini adalah membuat variasi batik minahasa berbasis Julia set. Hasil penelitian menunjukkan dengan memilih sebuah bilangan kompleks  tertentu dengan range  dan memberikan bentuk-bentuk Julia set yang menarik. Menggunakan aplikasi basis fraktal, variasi batik minahasa berbasis Julia set dibuat dari ragam hias tradisional Minahasa dan motif Julia set yang dipilih dengan mengatur properti motif yang ada seperti layer layout, banyak iterasi, lebar, panjang, sudut, peningkatan sudut dan lain-lain.Batik is a motif or ornaments (on cloth) which processed in a certain way usually using malam which is some kind of wax to the cloth. Batik Minahasa is batik with traditional motif or ornament from indigenous land of Minahasa, North Sulawesi, Indonesia. One of the reasons batik become the cultural heritage of Indonesia is because of the motif which contained local people’s life philosophies. Motif variation of batik Minahasa has not much developed even though there are variations made by combining the traditional motifs. Mathematics introduces fractal which has self-similarity characteristic in its shapes and Julia Set is one of fractals object that corresponds to complex numbers and is generated from the iterated function . The purpose of this research is to make variations of batik Minahasa based on Julia set. The results show that by selecting a complex number  within a range of  and  give interesting shapes of Julia sets. Using fractal-based applications, variation of batik Minahasa is made from traditional ornament and Julia Set motif which selected and arranging the properties such as layout layers, multiple iterations, width, length, angles, angle increases and more.


Fractals ◽  
1999 ◽  
Vol 07 (01) ◽  
pp. 41-49
Author(s):  
ALEXANDER V. MELNIKOV

A novel computational solution of the fractal inverse problem is suggested. The method presented is based on the idea of approximating fractal sets by Julia set attractors of polynomial Iterated Function Systems (IFS). An implementation of this method has shown good results and stable convergence both for polynomial Julia sets and other sets with similar features.


2021 ◽  
Vol 31 (08) ◽  
pp. 2130022
Author(s):  
Miaorong Zhang ◽  
Xiaofang Zhang ◽  
Qinsheng Bi

This paper focuses on the influence of two scales in the frequency domain on the behaviors of a typical dynamical system with a double Hopf bifurcation. By introducing an external periodic excitation to the normal form of the vector field with double Hopf bifurcation at the origin and taking the exciting frequency far less than the natural frequency, a theoretical model with two scales in the frequency domain is established. Regarding the whole exciting term as a slow-varying parameter leads to a generalized autonomous system, in which the equilibrium branches and their bifurcations with the variation of the slow-varying parameter can be derived. With the increase of the exciting amplitude, different types of bifurcations may be involved in the generalized autonomous system, resulting in several qualitatively different forms of bursting attractors, the mechanism of which is presented by overlapping the transformed phase portraits and the bifurcations of the equilibrium branches. It is found that the single mode 2D torus may evolve to the bursting attractors with mixed modes, in which the trajectory alternates between the single mode oscillations and the mixed mode oscillations. Furthermore, the transitions between the quiescent states and the spiking states may not occur exactly at the bifurcation points because of the slow passage effect, while Hopf bifurcations may cause different forms of repetitive spiking oscillations.


2016 ◽  
Vol 09 (03) ◽  
pp. 1650045 ◽  
Author(s):  
Mianmian Zhang ◽  
Yongping Zhang

Lotka–Volterra population competition model plays an important role in mathematical models. In this paper, Julia set of the competition model is introduced by use of the ideas and methods of Julia set in fractal geometry. Then feedback control is taken on the Julia set of the model. And synchronization of two different Julia sets of the model with different parameters is discussed, which makes one Julia set change to be another. The simulation results show the efficacy of these methods.


2012 ◽  
pp. 21-27
Author(s):  
Ziyang Meng ◽  
Tao Yang ◽  
Karl H. Johansson

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