A brief history of general mechanics.

In the history of mechanical development, general mechanics developed the earliest. From the study of celestial motion to Newton's era, an accurate discipline has been formed; Later, analytical mechanics established by J. Lagrange and W. Hamilton reached a more perfect level. The theory and method of general mechanics are the theoretical basis for the development of physics and other mechanics disciplines, and also play an important role in engineering technology. There are many branches of general mechanics, such as celestial mechanics, vibration theory, control theory, nonlinear dynamics, multi-body system dynamics, modern analytical mechanics and so on. There are also branches that closely combine engineering practice with high technology, such as gyro mechanics, robotics, sports biomechanics, flight mechanics, orbit theory, spacecraft attitude dynamics and so on. With the development of science and technology, the research object of general mechanics is no longer limited to discrete systems. For example, in the dynamics of multi-body system, a deformable flexible body is used to replace the rigid body in the system, and the rigid-flexible coupling problem is emphatically studied; However, the spacecraft filled with liquid propellant studied by spacecraft attitude dynamics still has the problem of rigid-flexible liquid coupling. Chaos in nonlinear dynamics reveals the inherent randomness in deterministic systems, which makes people's understanding of the colorful objective world reach a new level.