Solid-propellant and liquid-propellant launch vehices have their own characteristics,both playing an im-portant role in space transportation systems of space powers.This paper reviews and summarizes the development hi...Solid-propellant and liquid-propellant launch vehices have their own characteristics,both playing an im-portant role in space transportation systems of space powers.This paper reviews and summarizes the development history of solid-propellant launch vehicles,and analyzes their technical characteristics including multiple stages,large payloads,complex separation,diverse operation modes,fast response,and mission adaptability as well as unique ad-vantages in launch activities.This paper analyzes and proposes four development laws for solid-propellant launch vehi-des,including improving comprehensive performance,infusing heritage with innovation,unitization and seriation,and optimizing power systems.Finally,this paper proposes the opportunities and challenges faced by solid-propellant launch vehicles based on market demands.展开更多
One of the main challenges for multi-wheel hub motor driven vehicles is the coordination of individual drivetrains to improve mobility and stability in the steering process.This paper proposes a dual-steering mode bas...One of the main challenges for multi-wheel hub motor driven vehicles is the coordination of individual drivetrains to improve mobility and stability in the steering process.This paper proposes a dual-steering mode based on direct yaw moment control for enhancing vehicle steering ability in complex environ ments.The control system is designed as a hierarchical structure,with a yaw moment decision layer and a driving force distribution layer.In the higher-level layer,the objective optimization function is con-structed to obtain the slip steering ratio,which represents the degree of vehicle slip steering in the dual-steering mode.Ayaw moment controller using active disturbance rejection control theory is designed for continuous yaw rate control.When the actual yaw rate of the vehicle deviates from the reference yaw rate obtained by the vehicle reference model and the slip steering ratio,the yaw moment controller isactuated to determine the yaw moment demand for vehicle steering.In the lower-level layer,there is a torque distribution controller based on distribution rules,which meets the requirement of yaw moment demand without affecting the total longitudinal driving force of the vehicle.For verifying the validity and feasibility of the dual-steering mode,simulations were conducted on the hardware-in-loop real-time simulation platfomm.Additionally,corresponding real vehicle tests were carried out on an eight-wheel prototype vehicle.Test results were generally consistent with the simulation results,thereby demon-strating that the proposed dual-steering mode reduces steering radius and enhances the steering per-formance of the vehicle.展开更多
文摘Solid-propellant and liquid-propellant launch vehices have their own characteristics,both playing an im-portant role in space transportation systems of space powers.This paper reviews and summarizes the development history of solid-propellant launch vehicles,and analyzes their technical characteristics including multiple stages,large payloads,complex separation,diverse operation modes,fast response,and mission adaptability as well as unique ad-vantages in launch activities.This paper analyzes and proposes four development laws for solid-propellant launch vehi-des,including improving comprehensive performance,infusing heritage with innovation,unitization and seriation,and optimizing power systems.Finally,this paper proposes the opportunities and challenges faced by solid-propellant launch vehicles based on market demands.
基金This work was supported by the Weapons and Equipment Pre-Research Project of China(No.301051102).
文摘One of the main challenges for multi-wheel hub motor driven vehicles is the coordination of individual drivetrains to improve mobility and stability in the steering process.This paper proposes a dual-steering mode based on direct yaw moment control for enhancing vehicle steering ability in complex environ ments.The control system is designed as a hierarchical structure,with a yaw moment decision layer and a driving force distribution layer.In the higher-level layer,the objective optimization function is con-structed to obtain the slip steering ratio,which represents the degree of vehicle slip steering in the dual-steering mode.Ayaw moment controller using active disturbance rejection control theory is designed for continuous yaw rate control.When the actual yaw rate of the vehicle deviates from the reference yaw rate obtained by the vehicle reference model and the slip steering ratio,the yaw moment controller isactuated to determine the yaw moment demand for vehicle steering.In the lower-level layer,there is a torque distribution controller based on distribution rules,which meets the requirement of yaw moment demand without affecting the total longitudinal driving force of the vehicle.For verifying the validity and feasibility of the dual-steering mode,simulations were conducted on the hardware-in-loop real-time simulation platfomm.Additionally,corresponding real vehicle tests were carried out on an eight-wheel prototype vehicle.Test results were generally consistent with the simulation results,thereby demon-strating that the proposed dual-steering mode reduces steering radius and enhances the steering per-formance of the vehicle.
