First draw a curve according to your own needs.

The second step depends on the length of the line segment. The segmented curve is tried several times according to the actual situation, mainly the distance between the point and the point.

The next step is to draw a circle and select the surrounding curve. The center of the circle is the point on the curve in the previous step. Just draw two different sizes in the same way. The diameter is determined according to your needs.

Next, extend the curve array, array two size circles

In this step, attention should be paid to the distance between arrays, which is related to the distance between the points in the previous step. Remember the distance between the previous points. Or try a few more times

Select point-hide (delete also line), select that irregular curve-hide (delete also line)

Keep these size circles drawn according to curves.

Finally, lofting, all boxes select these large and small circles, and try out the pop-up dialog box for yourself. Which effect is needed

This is the method. The effect is to adjust the shape of the curve, the size of the circle and the distance between the points, and try several times according to your needs.