﻿ Refresher: Blend-Point and Segments

# Refresher: Blend-Point and Segments

### A Refresher on Segments and Blend-Points in MotionDesigner

 1 A motion describes the position that you would like a machine element to follow for a complete machine cycle.

The velocity, acceleration, and jerk values are motion derivatives of position.

There are also many mathematical function that describe the acceleration of the motion. These functions are integrated to obtain velocity and position, or differentiated to obtain jerk.

Each mathematical-function is also called a Motion-Law or Cam-Law. There many different Motion-Laws you can choose from, each with different applications or advantages.

In MotionDesigner, we use algebraic equations to obtain all motion-derivatives. This means we can input any value for the independent variable [usually machine angle or time] and obtain an exact motion-value.

 2 When the motion requirements becomes complex, it is difficult to find a single mathematical function that satisfies all of the motion requirements.
 3 Therefore, you will usually split, or divide, a motion into two or more segments. Each segment is also defined by a mathematical function and given a Motion-Law.
 4 The splitting [dividing] process is called segmentation.
 5 You must choose how many segments and also choose the Motion-Law for each segment.
 6 You must make sure the total duration of the segments is equal to one machine cycle.
 7 MotionDesigner joins the Segments end-to-end.
 8 We use the term 'Blend-Point' to describe an instance where one segment ends and another starts.

The Blend-Points define the motion-values at the start and the end of the Segment.

The Motion-Law defines the 'shape' and the motion-values between the Blend-Points.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd