Abstract
The parameter sensitivity analysis of a hydraulically interconnected suspension (HIS) system shows that the sensitivity of the vibration responses in the bounce and roll modes to the hydraulic parameters are complementary. A novel HIS-based semiactive control method was thereby proposed to improve ride comfort and antiroll performance. In addition, the classic sky-hook max-min damping switched strategy provides significant benefits around the body resonance, but otherwise performs similarly to, or sometimes even worse than, passive suspension. Therefore, a dual-frequency-range switching strategy, which has optimal max-min damping in both frequency ranges, was developed for improving the ride comfort in a wider frequency bandwidth. In this study, a 9-DOF HIS system dynamics model was established, and the hydraulically interconnected subsystem model was validated experimentally. Subsequently, the elastic and damping characteristics of the hydraulically interconnected subsystem, as well as the parameter sensitivity in bounce mode and roll mode, were analyzed. Next, the sensitive parameters were optimized under sinusoidal excitation at various frequencies, and a frequency-range selector used to determine the excitation frequency range and adjust the shock absorber damping was designed. Finally, simulations in the frequency domain and time domain show that the proposed HIS-based semiactive dual-frequency-range switching control suspension improves the ride comfort in a wider frequency bandwidth and enhances the antiroll performance in the transient and steady steering process.
Highlights
A semiactive suspension system is characterized by low energy consumption, economical cost, and achieving the majority performance of the active suspension system within a certain frequency bandwidth. us far, a vast amount of academic and industrial research activities have been undertaken to study such systems [1,2,3,4].As far as the research of semiactive suspensions is concerned, it can be summed up in two mainstream directions: the first focuses on developing advanced control strategies and algorithms, while the second revolves around developing reliable, high-performance adjustable shock absorbers and emphatically analyzes the damping adjusting mechanism, delay response, and compensation control
We found that the sensitivity of the vibration responses in the bounce mode and roll mode to the parameters of hydraulically interconnected subsystem is complementary, which provides an idea for developing a novel semiactive control to improve ride comfort and antiroll performance
Us far, the above analysis provides a scientific basis for developing a hydraulically interconnected suspension (HIS)-based semiactive control method to improve the ride comfort and antiroll performance. e principle of the proposed novel HIS-based semiactive control system can be seen as Figure 9: to improve the ride comfort by adjusting the diameters of throttle valves connecting to the hydraulic cylinders and to improve the antiroll performance by adjusting the diameters of throttle valves connecting to the accumulators
Summary
A semiactive suspension system is characterized by low energy consumption, economical cost, and achieving the majority performance of the active suspension system within a certain frequency bandwidth. us far, a vast amount of academic and industrial research activities have been undertaken to study such systems [1,2,3,4]. We found that the sensitivity of the vibration responses in the bounce mode and roll mode to the parameters of hydraulically interconnected subsystem is complementary, which provides an idea for developing a novel semiactive control to improve ride comfort and antiroll performance. It must be stressed that, because the development of a novel control theory is beyond the scope of this research, referring to the superiorities of the skyhook control strategy, this method is adopted to focus on the following: (1) to analyze parameter sensitivities for the bounce mode and roll mode, thereby developing a novel HIS-based semiactive control method and (2) to propose a switching control method based on excitation frequency-range identification, thereby improving the ride comfort in a wider frequency bandwidth. On this basis, a novel HIS-based semiactive control method is proposed to improve ride comfort and antiroll performance.
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