Abstract
The active engine mount (AEM) provides an effective solution to improve the acoustic and vibration comfort of a car. The same AEM can be installed for different engines and different vehicle bodies and attenuates the engine vibration, which is one of the most pressing challenges. To study this problem, this paper develops a mathematical model of a secondary path between the input voltage and output force of the AEM on the engine side considering the frequency-dependent characteristic of the stiffness, which includes the structure parameters of the AEM as well as the dynamics of the actuator, the fluid in the inertia track, the foundation (vehicle body), and the attenuated vibrating object (AEM preload or engine). The proposed model is validated by three test cases without vibration excitation, which are performed with different AEM preloads and foundations. The AEM is considered as an active part and passive part, the mass of which is determined experimentally. Parameter effect on the dynamic characteristics of the secondary path of the AEM is studied based on three tests and a numerical simulation.
Highlights
Academic Editor: Yakov Strelniker e active engine mount (AEM) provides an effective solution to improve the acoustic and vibration comfort of a car. e same AEM can be installed for different engines and different vehicle bodies and attenuates the engine vibration, which is one of the most pressing challenges
This paper develops a mathematical model of a secondary path between the input voltage and output force of the AEM on the engine side considering the frequency-dependent characteristic of the stiffness, which includes the structure parameters of the AEM as well as the dynamics of the actuator, the fluid in the inertia track, the foundation, and the attenuated vibrating object (AEM preload or engine). e proposed model is validated by three test cases without vibration excitation, which are performed with different AEM preloads and foundations. e AEM is considered as an active part and passive part, the mass of which is determined experimentally
Several concepts for AEM have been proposed [2,3,4,5]. e common AEM [6,7,8,9] is similar to the conventional hydraulic engine mount (HEM) with an actuator, such as a solenoid or a voice coil actuator, as shown in Figure 1; the AEM is excited by a controller, and it generates active output forces to suppress the high-frequency engine vibrations. e secondary path between the input voltage of the AEM and the output force of the AEM on the engine side can be used to study the dynamic characteristics of the AEM and improve the performance of the model-based AEM control. e existing research methods of the secondary path can be divided into two categories: identification and theoretical modelling
Summary
E active engine mount (AEM) provides an effective solution to improve the acoustic and vibration comfort of a car. e same AEM can be installed for different engines and different vehicle bodies and attenuates the engine vibration, which is one of the most pressing challenges. E same AEM can be installed for different engines and different vehicle bodies and attenuates the engine vibration, which is one of the most pressing challenges To study this problem, this paper develops a mathematical model of a secondary path between the input voltage and output force of the AEM on the engine side considering the frequency-dependent characteristic of the stiffness, which includes the structure parameters of the AEM as well as the dynamics of the actuator, the fluid in the inertia track, the foundation (vehicle body), and the attenuated vibrating object (AEM preload or engine). E secondary path between the input voltage of the AEM and the output force of the AEM on the engine side can be used to study the dynamic characteristics of the AEM and improve the performance of the model-based AEM control. Fakhari et al [15, 16]
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