Inertia

About: Inertia is a research topic. Over the lifetime, 12006 publications have been published within this topic receiving 164291 citations.

Basic consideration of vibration suppression and disturbance rejection control of n-inertia system using SFLAC (state feedback and load acceleration control)

Abstract: SFLAC (state feedback and load acceleration control) is proposed for vibration suppression and disturbance rejection control of n-inertia system. An n-inertia system is a model of a steel rolling mill, flexible arm, large scale space structure, etc., and its control will be an important problem in the future motion control. The main idea of SFLAC is to control the load acceleration which can be estimated by the state observer including the disturbance estimation. A simple PI speed controllers and SFLAC based on the reduction models using 2 and 3 inertia moments are designed. The effectiveness of SFLAC is demonstrated showing some simulation results. >

A Biomechanical Evaluation of Resistance: Fundamental Concepts for Training and Sports Performance

Abstract: Newton's second law of motion describes the acceleration of an object as being directly proportional to the magnitude of the net force, in the same direction as the net force and inversely proportional to its mass (a = F/m). With respect to linear motion, mass is also a numerical representation of an object's inertia, or its resistance to change in its state of motion and directly proportional to the magnitude of an object's momentum at any given velocity. To change an object's momentum, thereby increasing or decreasing its velocity, a proportional impulse must be generated. All motion is governed by these relationships, independent of the exercise being performed or the movement type being used; however, the degree to which this governance affects the associated kinematics, kinetics and muscle activity is dependent on the resistance type. Researchers have suggested that to facilitate the greatest improvements to athletic performance, the resistance-training programme employed by an athlete must be adapted to meet the specific demands of their sport. Therefore, it is conceivable that one mechanical stimulus, or resistance type, may not be appropriate for all applications. Although an excellent means of increasing maximal strength and the rate of force development, free-weight or mass-based training may not be the most conducive means to elicit velocity-specific adaptations. Attempts have been made to combat the inherent flaws of free weights, via accommodating and variable resistance-training devices; however, such approaches are not without problems that are specific to their mechanics. More recently, pneumatic-resistance devices (variable) have been introduced as a mechanical stimulus whereby the body mass of the athlete represents the only inertia that must be overcome to initiate movement, thus potentially affording the opportunity to develop velocity-specific power. However, there is no empirical evidence to support such a contention. Future research should place further emphasis on understanding the mechanical advantages/disadvantages inherent to the resistance types being used during training, so as to elicit the greatest improvements in athletic performance.

Effects of rotational Inertia on power system damping and frequency transients

Abstract: Rotational Inertia is an integral part of any electric power system. Due to the increased use of power electronics—both to connect Renewable Energy Sources (RES) and as drives for electric motors—inertia levels are generally reduced and become time dependent. The same power electronic technologies can also be used to actively provide inertia to the power system, raising the question what effect changes in inertia has on power system stability, and how to best place devices providing virtual inertia. We propose an optimization program that answers these question, and analytically derive the sensitivities of transient frequency overshoot and damping ratio to inertia and damping. An example shows how damping ratio can be improved while transient frequency limits are respected.

Electric power steering device

Abstract: PROBLEM TO BE SOLVED: To provide an electric power steering device capable of ensuring superior steering response characteristic not depending on inertia main shaft arrangement of an actual vehicle. SOLUTION: The electric power steering device 1 is provided with a torque sensor 10 for detecting steering torque generated by steering operation; a vehicle speed sensor 11 for detecting a vehicle speed; and an ECU 12. The ECU 12 has an assist amount operation part 13 for determining an assist amount based on a detection value of the torque sensor 10 and the vehicle speed sensor 11; an assist amount correction part 14 for correcting the assist amount using a transmission function obtained by vehicle item data including a parameter regarding the actual inertia main shaft arrangement and target inertia main shaft arrangement; and a motor driving control part 15 for controlling driving of a motor 8 according to the assist amount after correction. The vehicle item data including the parameter regarding the actual inertia main shaft arrangement and the target inertia main shaft arrangement are previously memorized in a memory 16. COPYRIGHT: (C)2008,JPO&INPIT

Inertia law for spectral stability of solitary waves in coupled nonlinear Schrödinger equations

Abstract: Spectral stability analysis for solitary waves is developed in the context of the Hamiltonian system of coupled nonlinear Schrodinger equations. The linear eigen- value problem for a non-self-adjoint operator is studied with two self-adjoint matrix Schrodinger operators. Sharp bounds on the number and type of unstable eigen- values in the spectral problem are found from the inertia law for quadratic forms, associated with the two self-adjoint operators. Symmetry-breaking stability analysis is also developed with the same method.