## Abstract

A procedure for calculating relative accelerations in spatial mechanisms is extended to include ball joints. The relationship of the relative velocities in a closed-loop mechanism is differentiated and then manipulated into set of simultaneous linear equations in the unknown relative accelerations. The derivatives of the joint-link modeling matrices, which are required to construct the vector of constants in this set of simultaneous linear equations, are formulated in terms of partial-derivative operator matrices to facilitate automatic differentiation in computer calculations. The joint-link modeling matrices, the relative velocities, and the relative accelerations are written in terms of dual numbers so to provide compact expressions which can be readily coded in object-oriented programming. The relationship of the calculated relative-acceleration components, which are expressed in the same coordinate frame, and the physical relative-acceleration components, which are naturally expressed in different coordinate frames, is developed and explained. The RSSR spatial four-bar mechanism is presented as an example of the methodology applied to a mechanism with ball joints.

Original language | English (US) |
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Pages (from-to) | 1-16 |

Number of pages | 16 |

Journal | Mechanics Based Design of Structures and Machines |

Volume | 42 |

Issue number | 1 |

DOIs | |

State | Published - Jan 2 2014 |

## All Science Journal Classification (ASJC) codes

- Civil and Structural Engineering
- General Mathematics
- Automotive Engineering
- Aerospace Engineering
- Condensed Matter Physics
- Ocean Engineering
- Mechanics of Materials
- Mechanical Engineering

## Keywords

- Acceleration
- Ball joint
- Dual number
- RSSR
- Relative acceleration