Btukfyl

How to draw this image with TikZ?

Any suggestions? I want to try my own but I need some help to start.

EDIT, First try, I am working on it:

documentclass[tikz,border=2mm]{standalone}

 usetikzlibrary{shadings}

 usetikzlibrary{shadows.blur}

 tikzset{% from https://tex.stackexchange.com/a/287177/121799

   my blur shadow layer/.style={

     preaction={fill=black,fill opacity=.025,transform

     canvas={xshift=#1,yshift=0}},

   },

   my blur shadow/.style={

     my blur shadow layer/.list={.3pt,.6pt,...,4.8pt},

   },

 }

 makeatletter%from https://tex.stackexchange.com/a/245444/121799

 pgfdeclareradialshading{tikz@lib@fade@circle@5}{pgfpointorigin}{%

   color(0pt)=(pgftransparent!0); color(18.75bp)=(pgftransparent!0);%

   color(22bp)=(pgftransparent!100); color(40bp)=(pgftransparent!100)%

 }

 pgfdeclarefading{circle with fuzzy edge 5 percent}{%

   pgfuseshading{tikz@lib@fade@circle@5}%

 }

 pgfdeclareradialshading{tikz@lib@fade@circle@2}{pgfpointorigin}{%

   color(0pt)=(pgftransparent!100); color(18.75bp)=(pgftransparent!100);%

   color(22bp)=(pgftransparent!0); color(40bp)=(pgftransparent!0)%

 }

 pgfdeclarefading{circle with fuzzy edge 2 percent}{%

   pgfuseshading{tikz@lib@fade@circle@2}%

 }

 makeatother

 begin{document}

 begin{tikzpicture}[font=bfseriessffamily]

  node[draw=gray!50,line width=0.5mm,circle,fill=blue!30, minimum width=3cm, 

  align=center, text width=3cm, text=white, font=bfseriessffamilyLarge,

  my blur shadow] (OVS) at (0,0)

  {Optimized vibrating systems};

  foreach Angle/Color/Label in

  {90/blue!80!white/PC,210/orange/AC,330/green!60!blue/FF}

  {

  node[draw=gray!50,line width=0.5mm,circle,

  left color=Color,right color=Color !60!black, minimum width=2cm, 

  align=center, text=white, font=bfseriessffamilyLarge,

  my blur shadow] (Label) at (Angle:2.4cm)

  {Label};

  }

  draw[ultra thick,latex-latex] (PC) to [bend right=30] 

  node[midway,fill=white,sloped]{}(AC);

  draw[ultra thick,latex-latex] (AC) to [bend right=30] 

  node[midway,fill=white,sloped]{}(FF);

  draw[ultra thick,latex-latex] (FF) to [bend right=30] 

  node[midway,fill=white,sloped]{}(PC);

 end{tikzpicture}

 end{document}

With such a nice starting point it is not too difficult. ;-)

documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{shadings,intersections,calc,decorations.text}

usetikzlibrary{shadows.blur,arrows.meta,bending}

tikzset{% from https://tex.stackexchange.com/a/287177/121799

   my blur shadow layer/.style={

     preaction={fill=black,fill opacity=.025,transform

     canvas={xshift=#1,yshift=0}},

   },

   my blur shadow/.style={

     my blur shadow layer/.list={.3pt,.6pt,...,4.8pt},

   },

 }

 makeatletter%from https://tex.stackexchange.com/a/245444/121799

 pgfdeclareradialshading{tikz@lib@fade@circle@5}{pgfpointorigin}{%

   color(0pt)=(pgftransparent!0); color(18.75bp)=(pgftransparent!0);%

   color(22bp)=(pgftransparent!100); color(40bp)=(pgftransparent!100)%

 }

 pgfdeclarefading{circle with fuzzy edge 5 percent}{%

   pgfuseshading{tikz@lib@fade@circle@5}%

 }

 pgfdeclareradialshading{tikz@lib@fade@circle@2}{pgfpointorigin}{%

   color(0pt)=(pgftransparent!100); color(18.75bp)=(pgftransparent!100);%

   color(22bp)=(pgftransparent!0); color(40bp)=(pgftransparent!0)%

 }

 pgfdeclarefading{circle with fuzzy edge 2 percent}{%

   pgfuseshading{tikz@lib@fade@circle@2}%

 }

 makeatother

 begin{document}

 begin{tikzpicture}[font=bfseriessffamily]

  node[draw=gray!50,line width=0.5mm,circle,fill=blue!80, minimum width=3cm, 

  align=center, text width=3cm, text=white, font=bfseriessffamilyLarge,

  my blur shadow] (OVS) at (0,0)

  {Optimized vibrating systems};

  path[name path=circle] (0,0) circle[radius=3.4cm];

  foreach Angle/Color/Label in

  {90/green!70!black/PC,210/orange/AC,330/red!80!black/FF}

  {

  node[draw=gray!50,line width=0.5mm,circle,name path=Label,

  left color=Color,right color=Color !60!black, minimum width=2cm, 

  align=center, text=white, font=bfseriessffamilyLarge,

  my blur shadow] (Label) at (Angle:3.4cm)

  {Label};

  path[name intersections={of=circle and Label,by={Label-1,Label-2}}];

  draw[line width=2mm,-{Latex[length=2mm,width=4mm]}] (OVS) -- (Label);

  }

  draw[ultra thick,latex-latex] let p1=(AC-1),p2=(PC-2),n1={atan2(y1,x1)},n2={atan2(y2,x2)}

  in   (PC-2) arc(n2:n1+360:3.4cm);

  draw[ultra thick,latex-latex] let p1=(PC-1),p2=(FF-1),n1={atan2(y1,x1)},n2={atan2(y2,x2)}

  in   (FF-1) arc(n2:n1:3.4cm);

  draw[ultra thick,latex-latex] let p1=(FF-2),p2=(AC-2),n1={atan2(y1,x1)},n2={atan2(y2,x2)}

  in   (AC-2) arc(n2:n1:3.4cm);

  draw[even odd rule,bottom color=gray!80,top color=gray!20] (0,0)

        circle[radius=5cm] circle[radius=6cm];

  path[decoration={raise = -0.8ex,text  along path,

                text = {|hugesffamilybfseries|Dynamic model},

                text align = center,

            }, decorate]

 (150:5.4) arc (150:30:5.4cm);

  path[decoration={raise = -0.8ex,text  along path,

                text = {|largesffamilybfseries|Mass M, Damping D, Stiffness K},

                text align = center,

            }, decorate]

 (225:5.4) arc (225:135:5.4cm);

  path[decoration={raise = -0.8ex,text  along path,

                text = {|largesffamilybfseries|Frequency response function H},

                text align = center,

            }, decorate]

 (45:5.4) arc (45:-45:5.4cm);

 draw[line width=1mm,-{Latex[bend]}] (135:5.5) arc(135:120:5.5);

 draw[line width=1mm,-{Latex[bend]}] (45:5.5) arc(45:60:5.5);

end{tikzpicture}

end{document}