dynamic property
Flight Structure Optimization of Modular Reconfigurable UAVs
Su, Yao, Jiao, Ziyuan, Zhang, Zeyu, Zhang, Jingwen, Li, Hang, Wang, Meng, Liu, Hangxin
Abstract-- This paper presents a Genetic Algorithm (GA) designed to reconfigure a large group of modular Unmanned Aerial Vehicles (UAVs), each with different weights and inertia parameters, into an over-actuated flight structure with improved dynamic properties. Previous research efforts either utilized expert knowledge to design flight structures for a specific task or relied on enumeration-based algorithms that required extensive computation to find an optimal one. Additionally, we employ a tree representation and a vector representation to describe flight structures, facilitating efficient crossover operations and fitness evaluations within the GA framework, respectively. Using cubic modular quadcopters capable of functioning as omni-directional thrust generators, we validate that the proposed approach can (i) adeptly identify suboptimal configurations Figure 1: The optimal structure configuration with five modular ensuring over-actuation while ensuring trajectory UAVs with different installed equipment. Each module is tracking accuracy and (ii) significantly reduce computational equipped with either a manipulator, an RGBD camera, a Lidar, costs compared to traditional enumeration-based methods.
Compositional 4D Dynamic Scenes Understanding with Physics Priors for Video Question Answering
Wang, Xingrui, Ma, Wufei, Wang, Angtian, Chen, Shuo, Kortylewski, Adam, Yuille, Alan
For vision-language models (VLMs), understanding the dynamic properties of objects and their interactions within 3D scenes from video is crucial for effective reasoning. In this work, we introduce a video question answering dataset SuperCLEVR-Physics that focuses on the dynamics properties of objects. We concentrate on physical concepts -- velocity, acceleration, and collisions within 4D scenes, where the model needs to fully understand these dynamics properties and answer the questions built on top of them. From the evaluation of a variety of current VLMs, we find that these models struggle with understanding these dynamic properties due to the lack of explicit knowledge about the spatial structure in 3D and world dynamics in time variants. To demonstrate the importance of an explicit 4D dynamics representation of the scenes in understanding world dynamics, we further propose NS-4Dynamics, a Neural-Symbolic model for reasoning on 4D Dynamics properties under explicit scene representation from videos. Using scene rendering likelihood combining physical prior distribution, the 4D scene parser can estimate the dynamics properties of objects over time to and interpret the observation into 4D scene representation as world states. By further incorporating neural-symbolic reasoning, our approach enables advanced applications in future prediction, factual reasoning, and counterfactual reasoning. Our experiments show that our NS-4Dynamics suppresses previous VLMs in understanding the dynamics properties and answering questions about factual queries, future prediction, and counterfactual reasoning. Moreover, based on the explicit 4D scene representation, our model is effective in reconstructing the 4D scenes and re-simulate the future or counterfactual events.
From Organisational Structure to Organisational Behaviour Formalisation
Jonker, Catholijn M., Treur, Jan
As the complexity of systems based on multiple software agents increases, as is the case, for example in the context of Internet, their dynamics are less easy to predict and to manage. A recent development is to incorporate organisation modelling methods within the software engineering process of multi-agent systems. Indeed, like complex agent-based software systems, societies are characterised by complex dynamics involving interaction between large numbers of actors and groups of actors. If within society such complex dynamics would take place in an completely unstructured, incoherent manner, any actor involved has not much to rely on to do prediction, and therefore is not able to function in a knowledgeable manner. This has serious disadvantages, which is a reason why in history within human societies organisational structure has been developed as a means to manage complex dynamics. Here it is assumed that organisational structure provides co-ordination of the processes in such a manner that a process or agent involved can function in a more adequate manner. So the basic assumption is that providing organisational structure has implications to organisational dynamics. The dynamics induced by a given organisational structure are much more dependable than in an entirely unstructured situation. It is assumed that the organisational structure itself is relatively stable, i.e., the structure may change, but the frequency and scale of change are
Simulation of Optimal Movements Using the Minimum-Muscle-Tension-Change Model
Dornay, Menashe, Uno, Yoji, Kawato, Mitsuo, Suzuki, Ryoji
This work discusses various optimization techniques which were proposed in models for controlling arm movements. In particular, the minimum-muscle-tension-change model is investigated. A dynamic simulator of the monkey's arm, including seventeen single and double joint muscles, is utilized to generate horizontal hand movements. The hand trajectories produced by this algorithm are discussed.
Simulation of Optimal Movements Using the Minimum-Muscle-Tension-Change Model
Dornay, Menashe, Uno, Yoji, Kawato, Mitsuo, Suzuki, Ryoji
This work discusses various optimization techniques which were proposed in models for controlling arm movements. In particular, the minimum-muscle-tension-change model is investigated. A dynamic simulator of the monkey's arm, including seventeen single and double joint muscles, is utilized to generate horizontal hand movements. The hand trajectories produced by this algorithm are discussed.
Simulation of Optimal Movements Using the Minimum-Muscle-Tension-Change Model
Dornay, Menashe, Uno, Yoji, Kawato, Mitsuo, Suzuki, Ryoji
This work discusses various optimization techniques which were proposed in models for controlling arm movements. In particular, the minimum-muscle-tension-change model is investigated. A dynamic simulator of the monkey's arm, including seventeen single and double joint muscles, is utilized to generate horizontal hand movements. The hand trajectories produced by this algorithm are discussed.