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This paper investigates the problem of vehicle active suspension control with frequency band constraints and actuator input delay. First, the mathematical model of suspension systems is established, and the problem of suspension control with finite-frequency constraints is formulated to match the characteristics of the human body. Then, the finite-frequency method is developed to deal with the problem...
LQG and LQI control theory were used to control the suspension system of the vehicle. We analyzed the characters of the system through simulation, and found that, with the LQI control algorithm, ride comfort and dynamic deflection can be improved simultaneously at the natural frequency of the weight on the spring. While with the LQG control algorithm cannot bring about that. But with LQG control,...
The parameters of suspension system cannot change according to the road excitation, and the system can only store or exhaust the body vibration energy. The active suspension system can improve both the riding comfort and handing safety in various operation conditions. The least means squares adaptive algorithm is used in active suspension system. For the least means squares adaptive algorithm, the...
This paper presents an intelligent method of Active Force Control scheme applied to the vehicle suspension system of a quarter car model with actuator dynamics. The proposed controller structure consists of three loops. Outer loop controller is used for the target force computation to reject the road disturbances. Inner force tracking loop is used to keep the actual force close to the target force...
Based on the PID control and adaptive fuzzy PID control, the paper establishes semi-active suspension model of engineering vehicle and compares vibration control and suspension performance among the semi-active suspensions, taking engineering vehicle as the study object. Through the further simulation research, from the comparative analysis performance indexes of riding comfort and handling safety,...
With the user's needs and the development of modern technology, the engineering vehicles develop continuously toward the heavy-load and high-speed direction. The higher riding comfort requirements of engineering vehicles are put forward. The traditional passive suspension had not met the requirements of riding comfort. An adaptive fuzzy PID control method is proposed for the semi-active suspension...
In this paper, the problem of H?? control for active vehicle suspension systems in finite frequency domain is investigated. By using the generalized Kalman-Yakubovich-Popov (KYP) lemma, the H?? norm from the disturbance to the controlled output is decreased in specific frequency band to improve the ride comfort. Compared with the entire frequency approach, the finite frequency approach suppresses...
Elicited from the least means squares optimal algorithm (LMS), an adaptive fuzzy logic controller (AFC) based on interval type-2 fuzzy sets is proposed for vehicle non-linear active suspension systems. The interval membership functions (IMF2s) are utilized in the AFC design to deal with not only non-linearity and uncertainty caused from irregular road inputs and immeasurable disturbance, but also...
In this paper a general approximate frequency method is intuitively developed for the design of suboptimal controller for the time invariant linear system under the structural constraints, in which the feedback gains of the suboptimal controller is obtained from the optimal controller of the corresponding reference system without structural constraints. The method is simple and robust in computation...
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