New Numerical Results from Simulations of Beams and Space Frame Systems with a Tuned Mass Damper

• Main Authors: Nguyen Chi Tho, Nguyen Tri Ta, Do Van Thom
• Format: Article
• Language: English
• Published: MDPI AG 2019-04-01
• Series: Materials
• Subjects: space frame; tuned mass damper; finite element; random load; stationary process
• Online Access: https://www.mdpi.com/1996-1944/12/8/1329

In working processes, mechanical systems are often affected by both internal and external forces, which are the cause of the forced vibrations of the structures. They can be destroyed if the amplitude of vibration reaches a high enough value. One of the most popular ways to reduce these forced vibrations is to attach tuned mass damper (TMD) devices, which are commonly added at the maximum displacement point of the structures. This paper presents the computed results of the free vibration and the vibration response of the space frame system under an external random load, which is described as a stationary process with white noise. Static and dynamic equations are formed through the finite element method. In addition, this work also establishes artificial neural networks (ANNs) in order to predict the vibration response of the first frequencies of the structure. Numerical studies show that the data set of the TMD device strongly affects the first frequencies of the mechanical system, and the proposed artificial intelligence (AI) model can predict exactly the vibration response of the first frequencies of the structure. For the forced vibration problem, we can find optimal parameters of the TMD device and thus obtain minimum displacements of the structure. The results of this work can be used as a reference when applying this type of structure to TMD devices.