Mixed-mode magnetorheological isolator with variable decoupling membrane stiffness

Abstract

The invention discloses a variable decoupling membrane rigidity mixed mode magnetorheological vibration isolator. The variable decoupling membrane rigidity mixed mode magnetorheological vibration isolator comprises magnetorheological liquid, a shell, a rubber main spring, a connecting rod, a rubber bottom membrane, a magnetic core assembly; the magnetic core assembly comprises a magnet exciting coil, an outer magnetic core, an inner magnetic core, a base and a decoupling membrane; the inner magnetic core is shaped like a big-end-up cone frustum; the outer magnetic core is provided with a conical through hole matched with the inner magnetic core; the outer magnetic core and the inner magnetic core are matched with each other to form a conical damping channel used for enabling an upper cavity and a lower cavity to communicate with each other; the base is provided with a groove used for containing a decoupling membrane; and a throttling hole is formed in the bottom of the groove. The variable decoupling membrane rigidity mixed mode magnetorheological vibration isolator has the two modes of flowing and extruding, and therefore the magnetorheological vibration isolator not only has thewide dynamic rigidity adjustable range, but also can limit the zero field dynamic rigidity from being too large; the magnetorheological vibration isolator is driven by the single magnet exciting coil,and therefore the mixed working modes in a real sense are achieved; and in addition, the vibration isolation requirements of different power assemblies can be met by designing the magnitude of an included angle.

Description

technical field [0001] The invention relates to a powertrain magneto-rheological vibration isolator, in particular to a powertrain variable decoupling membrane stiffness mixed-mode magneto-rheological vibration isolator. Background technique [0002] The viscosity and yield stress of magnetorheological fluid can change with the change of the external magnetic field, and this change has the characteristics of fast, reversible and controllable. The magneto-rheological vibration isolator uses the characteristics of the magneto-rheological fluid to change the output damping force of the magneto-rheological hydraulic vibration isolator by controlling the current in the excitation coil to change the magnetic field strength, thereby attenuating the vibration of the powertrain. This process responds quickly, and the process is continuous and reversible. [0003] Existing magneto-rheological vibration isolators for automotive powertrain vibration isolation systems are generally comp...

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Problems solved by technology

[0005] 2) Existing multi-mode magneto-rheological isolators are generally a simple superposition of different operating modes, and different operating modes must be driven separately by multiple excitation coils, which increases the complexity of the structure and control method

[0006] 3) Due to the high viscosity of the magnetorheological liquid, the high-frequency dynamic hardening phenomenon of the magnetorheological vibration isolator is prominent, and it is difficult for the constant stiffness decoupling film to relieve the high-frequency hardening of the magnetorheological vibration isolator

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