Article
Mathematics, Interdisciplinary Applications
Tuan Anh Nguyen
Summary: This research introduces the use of active suspension with a hydraulic actuator to improve car comfort. By utilizing a quarter-dynamics model and sliding mode control algorithm, the values of vehicle body acceleration and displacement are reduced while maintaining stability. The change in dynamics force at the wheel is not significant compared to traditional suspension.
Article
Green & Sustainable Science & Technology
Xu Hu, Qiu Liu, Bingyi Liu, Xiaolei Li, Liang Gu
Summary: The study proposes a design framework for conducting lightweight design in the layout design stage of suspension system, demonstrates its effectiveness through a case study, and reveals a trade-off between the load carried by each component and the adjustment height performance.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Mechanical
Pak Kin Wong, Hang Wang, Jing Zhao
Summary: In this paper, a robust control algorithm is proposed to achieve finite-time vehicle height and posture control in an electronically controlled air suspension (ECAS) system with actuator faults and uncertainties under non-stationary condition. Synchronization errors between corners are used to form a synchronization control strategy for simultaneous position control of the vehicle's four corners. Finite-time stability constraint and strategically designed H-infinity index are applied to improve system convergence speed and robustness. The proposed fault-tolerant control methodology considers actuator fault and uncertain parameters due to degradation of solenoid valves in the ECAS system. Road disturbance is applied to provide a non-stationary condition. Software-in-the-loop tests and hardware-in-the-loop tests are conducted to demonstrate the effectiveness of the proposed controller.
NONLINEAR DYNAMICS
(2023)
Article
Green & Sustainable Science & Technology
Hewen Tan, Gang Wang, Shuhui Zhou, Honglei Jia, Minghao Qu, Meiqi Xiang, Xiaomei Gao, Zihao Zhou, Hailan Li, Zhaobo Zou
Summary: This study proposes an adaptive adjustment method for the header height of a maize harvester. By using a pressure-wheel profiling device to monitor changes in terrain in real-time, the header height can be automatically adjusted. Experimental results demonstrate that the adaptive adjustment system meets the requirements for the header height of the maize harvester.
Article
Automation & Control Systems
Qiguo Hu, Wei Lu, Jingzhen Jiang
Summary: This article investigates the modeling and verification of the vehicle height and body posture adjustment control system of electronically controlled air suspension (ECAS). A nonlinear mechanism model and a hybrid automaton are established to achieve coordinated control, successfully solving the challenges in ECAS.
INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING
(2021)
Article
Acoustics
Zhihong Li, Jialing Yao, Youlin Xu, Yunyi Jia
Summary: This paper proposes a novel idea of vertically shifting an isolated body based on vibration of a nonlinear system with asymmetrical damping. The feasibility of the idea is verified using an analytical approximation method. The effects of critical parameters on the system's vibration response are analyzed, and the idea is applied to vehicle height adjustments.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Automation & Control Systems
Trevor J. Bird, Herschel C. Pangborn, Neera Jain, Justin P. Koeln
Summary: This article introduces a new set representation called the hybrid zonotope, which is equivalent to the union of 2N constrained zonotopes by adding N binary zonotope factors. The main contribution is a closed-form solution for exact forward reachable sets of discrete-time, linear hybrid systems modeled as mixed logical dynamical systems. The proposed approach captures the worst-case exponential growth in the number of convex sets required to represent the nonconvex reachable set while exhibiting only linear growth in the complexity of the hybrid zonotope set representation. Numerical examples demonstrate its ability to compactly represent nonconvex reachable sets with an exponential number of features. Furthermore, it is shown to be closed under linear mappings, Minkowski sums, generalized intersections, and halfspace intersections.
Article
Mathematics
Xiaopeng Li, Fanjie Li, Dongyang Shang
Summary: This paper establishes a vehicle model with ISD suspension system to study its dynamic responses and vibration reduction performance under different road excitations. It is found that the ISD suspension system has the best comprehensive vibration reduction performance at the optimal vehicle speed, making it more suitable for complex road conditions than single road excitation.
Article
Mathematics, Interdisciplinary Applications
Zheng Wang, Longyi Ran, Bing Kong, Xuezeng Jia, Liya Liu, Jafar Tavoosi
Summary: This paper presents a new method of intelligent control for vehicle suspension. The suspension system is modeled with all the details and a sliding mode control is designed based on the obtained model. The controller parameters and coefficients are calculated and updated by a type-2 fuzzy system. The proposed control system is evaluated through simulations with two-model uncertainty of the road, and the results demonstrate its high efficiency.
Article
Engineering, Mechanical
Sanjarbek Ruzimov, Luis M. Castellanos M. Molina, Renato Galluzzi, Raffaele Manca, Nicola Amati, Andrea Tonoli
Summary: This paper presents the modeling and validation of two height adjustment suspensions using concentrically and eccentrically mounted screws. It compares the performance of these solutions through simulations and experiments. The eccentric solution achieves higher overall efficiency due to the anti-rotation system and load balancing. Four prototypes are also tested on a demo vehicle for a comprehensive perspective on the eccentric mounted screw solution.
Article
Automation & Control Systems
Chunfang Yin, Dean Zhao, Jun Zhang, Shaohua Wang, Xing Xu, Xiaoqiang Sun, Dehua Shi
Summary: The ECAS system is designed with a finite-time controller through non-singular coordinate transformation and continuous finite-time theory, achieving better dynamic adjustment performance and anti-interference performance, improving the stability of body height and the overall performance of the system.
ASIAN JOURNAL OF CONTROL
(2022)
Article
Engineering, Aerospace
Yaqiang Wei, Xiao Yang, Zhigang Xu, Xinlin Bai
Summary: With the development of aerospace technology, the amount of space debris is increasing, necessitating the development of a large spacecraft-manipulator system for on-orbit service. In this study, a ground microgravity experiment system based on suspension and air-bearing is proposed to provide a stable microgravity environment. The system includes a suspension gravity compensation system, a suspension tracking smooth sliding mode control algorithm, and a target spacecraft simulator.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Anat Gesser-Edelsburg, Mina Zemach, Ricky Cohen, Talya Miron-Shatz, Maya Negev, Gustavo S. Mesch
Summary: A major earthquake in Israel is inevitable and it is important for individuals to be prepared in order to mitigate harm and save lives. While the public believes that geographic location is the critical variable influencing earthquake occurrence, experts note additional factors such as building strength, earthquake magnitude, and soil type. The study found that public willingness to prepare is influenced by knowledge of expert information, but the direction of this influence depends on risk perceptions and consistency with common knowledge.
Article
Engineering, Civil
Jianbin Xin, Xuwen Wu, Andrea D'Ariano, Rudy Negenborn, Fangfang Zhang
Summary: This paper proposes a new methodology for the path planning of a fleet of AGVs to improve the flexibility, robustness, and scalability of the AGV system. The methodology mathematically describes the transport process using a mixed logical dynamical (MLD) model and utilizes model predictive control and 0-1 integer linear programming to dynamically determine collision paths and solve the optimization problem. An ADMM-based decomposition technique is developed to coordinate the AGVs and reduce computational burden, allowing for real-time decisions. The proposed methodology is tested on industrial scenarios and proves effective in achieving high transport productivity with low computational burden.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Automation & Control Systems
Guangtong Ma, Yiyu Wang, Jun Luo, Yao Cai, Ruichen Wang, Xuliang Song
Summary: This article proposes a novel analytical-experiment coupling method for characterizing the electromagnetic forces of a superconducting electrodynamic suspension system. The method predicts the induced currents of the ground null-flux coils through analytical calculation and directly measures the electromagnetic forces on the onboard superconducting magnets. The accuracy of the induced current calculation is ensured through a Neumann's formula-based analytical model, which is validated by comparing with finite-element simulation. The proposed method is advantageous as it is not limited by high speed rotating motion and an experimental setup validates its effectiveness.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
