in this paper the concept of homothetic dual exponential motions in d3 is discussed and theirvelocities obtained. due to the way in which the matter is presented, the paper gives some formula and factsabout dual exponential motions which are not generally known

Abstract. We formulate the bedload sediment flux probability distribution from Lagrangian dynamics of individual grains. Individual particles obey Langevin equations wherein stochastic forces driving particle motions are switched on and off by entrainment deposition. The is calculated as rate many such crossing a control surface within specified observation time. Flux distributions inherit time...

We present a micromachined, stress-induced, thermal bimorph actuator for optical purpose. Piston motions of more than 3um are demonstrated by FEM simulation. Upon the release from the substrate, the actuators lift off the substrate due to a large built-in bending moment arising from the compressive residual stress in the poly-silicon layer and tensile residual stress in the metal layer. Large d...

near-fault ground motions with long-period pulses can place severe demands on structures near an active fault. these pulse-type ground motions can be represented by pulse sequences with simple shapes. half-sinusoidal pulse sequences are used to approximate recorded ground motions and dynamic responses of sdof system under the excitation of these pulse sequences are studied. four cases are consi...

We optimize three-dimensional snake kinematics for locomotor efficiency. assume a general space-curve representation of the backbone with small-to-moderate lifting off ground and negligible body inertia. The cost locomotion includes work against friction internal viscous dissipation. When restricted to planar kinematics, our population-based optimization method finds same types optima as previo...

ASCE 7-16 has provided a comprehensive platform for the performance-based design of tall buildings. The core of the procedure is based on nonlinear response history analysis of the structure subjected to recorded or simulated ground motions. This study investigates consistency in the ASCE 7-16 requirements regarding the use of different types of ground motions. For this purpose performance of a...

This paper considers the problem of path planning for teams of mobile robots. It presents a decoupled and prioritized approach to coordinate the movements of the mobile robots in their environment. Our algorithm computes the paths for the individual robots in the configuration-time space. Thereby it trades off the distance to both static objects as well as other robots and the length of the pat...

This paper presents a component of the on-line tasklevel planning system of the mobile, two-arm robot KAMRO, which is being developed at our Institute. This component generates sequences of explicit robot motions for achieving the goals of elementary assembly operations, and supervises their execution by the real-time robot control system, according to implicitly specified pick-and-place operat...

Complex behaviors of flying insects require interactions among sensory-neural systems, wing actuation biomechanics, and flapping-wing aerodynamics. Here, we review our recent progress in understanding these layers for maneuvering and stabilization flight of fruit flies. Our approach combines kinematic data from flying insects and aerodynamic simulations to distill reduced-order mathematical mod...