The ability for agents to arbitrarily control a safety-critical vehicle system comes with the necessity for this system to feature a "flight envelope protection system," should the agent erroneously or delib...
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ISBN:
(数字)9781624107115
ISBN:
(纸本)9781624107115
The ability for agents to arbitrarily control a safety-critical vehicle system comes with the necessity for this system to feature a "flight envelope protection system," should the agent erroneously or deliberately drive the system into hazardous situations. This need is particularly true of systems evolving in environments containing obstacles, either physical or otherwise. The "flight envelope protection system" aims to take over the vehicle's guidance before collision with the obstacle is unavoidable. Also named run-time assurance, the system generates "safe exit trajectories" in real time. This work provides a novel solution approach that follows a two-step process: First, reference backup trajectories are generated, together with trajectory regulation control laws, using a comprehensive but possibly time-consuming and unreliable trajectory optimization software. Second, we generate backup trajectories in real time by activating the regulation loop of a neighboring reference trajectory and computing the resulting trajectory. Numerical examples illustrate the approach. The work builds upon that previously reported in [1].
Most noise shaping (NS) SAR ADCs still use the same control algorithm as Nyquist SAR ADC. Noticing the slow-varying input under oversampling, this paper proposed a new algorithm named quantization-error-matched RLSB-f...
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ISBN:
(纸本)9798350361766;9798350361759
Most noise shaping (NS) SAR ADCs still use the same control algorithm as Nyquist SAR ADC. Noticing the slow-varying input under oversampling, this paper proposed a new algorithm named quantization-error-matched RLSB-first to improve the switching efficiency. Compared with the VCM-based algorithm, the proposed algorithm saves 87.3% switching power consumption in a 1st order NS SAR under an OSR of 25. Simulated under a 55nm CMOS process, the NS SAR ADC based on the proposed algorithm achieves an SNDR of 87.2dB with a 20kHz signal bandwidth. Operating at 2.8kS/s sampling rate, it consumes 12.1 mu W power, corresponding to a Schreier FoM of 179.4dB.
The present work deals with the design and validation of a formation flight control algorithm able to manage five aircraft simulated using a linear model representative of a a medium altitude, long endurance unmanned ...
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ISBN:
(数字)9781624107047
ISBN:
(纸本)9781624107047
The present work deals with the design and validation of a formation flight control algorithm able to manage five aircraft simulated using a linear model representative of a a medium altitude, long endurance unmanned airplane. The proposed approach is based on the artificial potential field and it is validated both in bi-dimensional and three-dimensional spaces. Even though the aircraft models are time-invariant, the external environment is simulated to be time-variant. In fact, within the simulation it is possible to simulate intruders, or object moving with its own dynamics, and no-fly zones.
Modeling and performance analysis of multiple area power system in S-domain is described in the present article. PID controller is used for load frequency control of the proposed multiple area power system. The use of...
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ISBN:
(纸本)9781538611203;9781538611197
Modeling and performance analysis of multiple area power system in S-domain is described in the present article. PID controller is used for load frequency control of the proposed multiple area power system. The use of PID controller ensures the reliability of power flow after a huge load disturbance in the power system network. Optimum values of Proportional, Integral and Differential controller gain has been determined using optimal control algorithm for reliable operation of the proposed multiple area power system. A digital control algorithm is also proposed in place of PID controller to improve the performance of the power system.
A hexapod platform can be considered as a solution for space missions in which more-established isolators (e.g. viscoelastic mounts) are not adequate to achieve the required high-performance isolation. Nevertheless, t...
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ISBN:
(数字)9781624106095
ISBN:
(纸本)9781624106095
A hexapod platform can be considered as a solution for space missions in which more-established isolators (e.g. viscoelastic mounts) are not adequate to achieve the required high-performance isolation. Nevertheless, these platforms are rarely integrated on a spacecraft due to several drawbacks they still present. The proposed hexapod platform aims at overcoming most of the current limitations, especially in terms of power consumption, complexity and isolation performance. This paper presents preliminary results for the first test campaign for a fully assembled hexapod, and their correlation with numerical models.
Multiport converters are used in spacecraft, where weight indicators are an important criterion. In this paper the scheme of multiport converter, providing the necessary operation modes is offered. The mathematical an...
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ISBN:
(纸本)9781538650219
Multiport converters are used in spacecraft, where weight indicators are an important criterion. In this paper the scheme of multiport converter, providing the necessary operation modes is offered. The mathematical analysis of electromagnetic processes was carried out, from which dependences of output voltage and accumulator battery current were obtained.
The multi-motor system position synchronous control has been widely used in the manufacturing industry, and its control structure and control strategy have a great impact on the quality and efficiency of industrial pr...
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The multi-motor system position synchronous control has been widely used in the manufacturing industry, and its control structure and control strategy have a great impact on the quality and efficiency of industrial production. Referring to a large amount of domestic and foreign research literature in recent years, this paper first gives an overall classification diagram of position synchronous control algorithms for the multi-motor system, then reviews seven typical control structures and analyses their synchronous performance of position synchronous control for the multi-motor system. Then, the comprehensive performance comparison of the six traditional PID control algorithms and modern control algorithms is summarized. After that, a multi-motor-integrated position synchronous control algorithm without combining position synchronous control structures is described. Finally, the main research difficulties of position synchronous control for the multi-motor system is reviewed from three aspects: jitter vibration suppression of position output, position synchronous control and motor quantity, and the relationship between position synchronous control and mechanical coupling. Finally, the future development trends in the position synchronous control for the multi-motor system are summarized and analysed.
We present a simulation architecture for a dynamic system composed of modular and interconnected small satellites. Standard modeling approaches rooted in analytical mechanics do not readily admit changes to the config...
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ISBN:
(数字)9781624106095
ISBN:
(纸本)9781624106095
We present a simulation architecture for a dynamic system composed of modular and interconnected small satellites. Standard modeling approaches rooted in analytical mechanics do not readily admit changes to the configuration space of a dynamic system. However, the proposed architecture is designed to handle discrete connection and detachment events using a dynamic constraint management algorithm. The capability of the simulation architecture is demonstrated using HIVE, a modular space architecture.
The management of ecological and economic risk allows for effective development of the enterprise. The article presents the control algorithm of ecological and economic risks as elements of management. The analysis of...
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ISBN:
(纸本)9781538643402
The management of ecological and economic risk allows for effective development of the enterprise. The article presents the control algorithm of ecological and economic risks as elements of management. The analysis of ecology-economic risks
Human controlled robots with variable parameters are considered, which are intended to solve manipulation problems when fast transportation operations are combined with high precision ones. In this paper, an issue of ...
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ISBN:
(纸本)0780392744
Human controlled robots with variable parameters are considered, which are intended to solve manipulation problems when fast transportation operations are combined with high precision ones. In this paper, an issue of the influence of robot dynamics on the system performance is investigated. Two algorithms are developed to solve the problem and their analysis is performed.
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