Multibody system design based on reference dynamic characteristics: gyroscopic system paradigm

The characteristic of controllable vane damp is about the relationship between choke opening and damp parameter of proportional flow control valve, the relationship between the input current of electromagnet and controllable damp parameter is available after knowing the characteristics of electromagnet. This is the basic of control system design and the central dynamic characteristics of vane damp. The structure of vane damp is analyzed and the flow model is established, to provide the theoretical guidance with the design, analysis and improvement of vane damp, a simple calculating and accurate analytical method is proposed.

Download Full-text

Optimization of a Flexible Multibody System Design Variables Using Genetic Algorithm

Lecture Notes in Mechanical Engineering - Design and Modeling of Mechanical Systems - IV ◽

10.1007/978-3-030-27146-6_101 ◽

2020 ◽

pp. 940-952

Author(s):

Mohamed Amine Ben Abdallah ◽

Imed Khemili ◽

Nizar Aifaoui

Keyword(s):

Genetic Algorithm ◽

System Design ◽

Multibody System ◽

Flexible Multibody System ◽

Design Variables ◽

Flexible Multibody

Download Full-text

Effects of revolute clearance joint on the dynamic behavior of a planar space arm system

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1177/0954410018760024 ◽

2018 ◽

Vol 233 (5) ◽

pp. 1629-1644 ◽

Cited By ~ 2

Author(s):

Huihui Miao ◽

Bing Li ◽

Jie Liu ◽

Anqi He ◽

Shangkun Zhu

Keyword(s):

Mathematical Model ◽

Dynamic Characteristics ◽

Degrees Of Freedom ◽

Multibody System ◽

Dynamic Performance ◽

Clearance Joint ◽

Locking Mechanism ◽

Operation Stability ◽

Pointing Accuracy ◽

The Mathematical Model

Space arm system is a typical multibody mechanical system requiring high operation stability and precision connected by kinematic joints. As joint clearance is inevitable during the manufacturing and mounting process, it turns into a critical problem affecting the dynamic characteristics and kinematic accuracy of the mechanism. A space arm system deploying stably and accurately is the prerequisite to guarantee the final satellite pointing accuracy once it is into its working state. Thus, the space arm system needs to have good dynamic characteristics and stability during its deploying process and to have accurate and reliable positioning characteristics during its locking process. For the deploying process, the mathematical model of a multibody system with clearance joint has been established as a foundation to study the influence of clearance properties, including clearance size, clearance joint locations, numbers of clearance joints and lubrication on the dynamic performance and motion stability of a two-degrees-of-freedom space arm system. The mathematical model of a locking mechanism has been established to study the clearance effects on the pointing accuracy of the space arm system during its locking process. The simulation results show that, the clearance has different effects on the dynamic characteristics of the space arm system during its different working processes.

Download Full-text