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For robots using elastic devices, pole vault is a particularly interesting task because poles have large differences from previously studied elastic elements in terms of their elastic capacity. The active actuation of the agent in “pole support phase” plays important roles in improving vaulting performance. Investigating this actuation can contribute to the design of novel control strategies during...
The performance and structure of the internal flow field of counterflow thrust vectoring nozzle under the impact of the external flow were studied by numerical simulation, considering the angle of external flow on the vectoring angle and the mass flux ratio of secondary flow. The results show that, when the external flow is of the same Mach number and the angle of the external flow increase in positive...
In this paper we consider the aggregation stability problem of a multi-agents system with general nonlinear attraction and repulsion forces and interaction constant time delays. The paper considers a general condition which extends the results provided in Shu and Zheng [1]. We show that the agents of multi-agents system with interaction time delays will asymptotically form a cohesive cluster with...
The classical fourth-order Runge-Katla integrator and the third-order force gradient symplectic integrator are used to solve the two-dimensional H'enon-Heiles system respectively. Numerical results, including the relative energy error, Poincare section, the largest Lyapunov exponent and Fast Lyapunov Indicator, are compared in detail. It is found that the Runge-Katla algorithm does not conserve the...
The cooperation behaviors existing in the animal and human being societies, have been modeled for the numerical optimization, but the local cooperation has not been modeled separately in optimization problems. In this paper the local cooperation is newly modeled as Neighborhood Field Model (NFM). Based on NFM, a new optimization technique called Neighborhood Field Optimization algorithm (NFO) is firstly...
In order to study how the insurance companies claim premiums with the stochastic interest rate, the interest force accumulation function with Wiener process and Poisson process is proposed in this paper. Based on this model, the life insurance actuarial model of paying premiums several times each year is built. And the expression of single net premium, reserve and future loss variance are given. With...
Generally, studies on inverted pendulum system only considered the viscous friction, the system with controllers designed based on this model was stable in simulations. However, when the controller was implemented in experimental system, small oscillation resulted. This paper give strong evidence that stick-slip friction between the cart and the track is the source of the small amplitude oscillations...
New precast concrete (NPC) shear wall consists of upper and lower prefabricated wall panels connected with reservation connection reinforcements inserted in the reserved galvanized metal bellows with full grout. The accomplished test results have demonstrated that the force mechanism of NPC shear wall is significantly different from that of traditional cast-in-situ concrete shear wall. To grasp the...
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