The iMachine is a spring-loaded turntable used to measure inertial properties of irregularly shaped rigid bodies, specifically manual wheelchairs. We used a Newton-Euler approach to calculate wheelchair mass and center of mass (CM) location from static force measurements using load cells. We determined the moment of inertia about the vertical axis from the natural frequency of the system in sim...

About 20 years ago, I first joined the spasticity measurement research group at biosignal laboratory (leaded by Dr. Jia-Jin Jason Chen) of Institute of Biomedical Engineering, National Cheng Kung University. At that time, the limitation of clinical approach for spasticity evaluation was initially noted by the researchers [1]. We developed our first quantitative measurement system based on drive...

in this paper mathematical structure of time-dependent lagrangian systems and their symmetries are extended and the explicit relation between constants of motion and infinitesimal symmetries of time-dependent lagrangian systems are considered. starting point is time-independent lagrangian systems ,then we extend mathematical concepts of these systems such as equivalent lagrangian systems to the...

Using thermal inertia in district heating systems (DHSs) to improve the dispatch flexibility and economy of integrated heat electricity (IHESs) is a research hotspot difficulty. In most existing studies, partial differential equations (PDEs) are approximated by discrete-time models, making it difficult accurately describe continuous dynamic processes. this paper, we propose novel generalized ph...

With the growing shift toward renewable energy, attention focused on disadvantages of current control inverter-based distributed generators, such as lack grid-forming ability and inertia. To provide inertia support ability, virtual synchronous generators (VSGs) have been proposed. Various methods related to VSGs reported, various research challenges evaluated. However, only a few experimental d...

The equilibrium orientations of a satellite in a circular orbit under the influence of gravitational and constant torques are investigated. The stationary motions of a satellite are governed by a set of nonlinear algebraic equations. A computer algebra method based on algorithm for the construction Groebner basis is proposed for determining the equilibrium orientations of a satellite with a giv...

the well-known electro-mechanical analogy that equates current, voltage, resistance, inductance and capacitance to force, velocity, damping, spring constant and mass has a shortcoming in that mass can only be used to simulate a capacitor which has one terminal connected to ground. a new model that was previously proposed by the authors that combines a mass with a pulley (mp) is shown to simulat...

The complete 3D nonlinear dynamic problem of extensible, flexible risers conveying fluid is considered. For describing the dynamics of the system, the Newtonian derivation procedure is followed. The velocity field inside the pipe formulated using hydrostatic and Bernoulli equations. The hydrodynamic effects of external fluids are taken into consideration through the nonlinear drag forces in var...