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Equations for the mechanics of wrist movement were formulated and simulated on the computer. The output is a display of wrist movement as muscle activation is altered and allows analysis of the control of wrist position through the use of different sets of muscles. The simulation includes the geometry of the wrist joint, the moment arms of the tendons, and the dependance of muscle force on muscle...
It is known that, for a gimbaled inertial measurement unit employing two dry-tuned gyros, a dual gyro wheel supply gives a better performance than a single gyro wheel supply. The effectiveness of the dual gyro wheel supply is explained in this paper by demonstrating the effects of certain vibrations on gyros. It will be shown that a dry-tuned gyro is susceptible to vibrations at frequencies which...
Large industrial projects and processes which consists of a member of subprojects or subprocesses are modelled as two level large scale dynamic systems. The control functions are divided into two categories. The first is a set of local controllers which are functions of the local states of the subproject. These controllers are used to control the subprojects executions irrespective of the interconnections...
Basic neuroscience researchers are working closely with physical scientists and engineers to develop neural prostheses for individuals with disorders of the nervous system. These aids include auditory prostheses for the deaf, bladder evacuation prostheses and motor prostheses for the paralyzed. The level of sophistication of these devices is increasing, and several are now beginning to move from open...
This paper examines certain aspects of the realizability of input/output maps f: R* ?? R by one-dimensional non-linear discrete-time systems, where R* is the free monoid on the reals R, under the operation of string concatenation. Realizations are sought which are bounded and/or Lipschitz. A natural connection between such constrained realizations and the string-processing properties of the input/output...
The Jet Propulsion Laboratory (JPL) has been involved in the incorporation of autonomous features in spacecraft design since the early 1960's. The unique requirements of deep space missions, such as long communication delay times, have been the major driver for increasing autonomous capabilities. More recently, the Viking Orbiter mission at Mars, and the Voyager missions to Jupiter and Saturn, have...
The issue of design of feedback controllers for elastic structures is addressed, where the objective is accurate and robust displacement control of the structure. Motivation for the work arises from study of control of multi-story buildings as part of the pseudo-dynamic-test method. If the force actuators have "fast" dynamics suitable control may be achieved by feedback of structural displacements...
This article discusses a method of devising schedules for rolling hot steel ingots to slab thickness in minimum time, subject to constraints on draft, rolling force, rolling torque and motor power. Discrete dynamic programming is used as a tool to solve the problem. A computer program for computing the schedule is also presented.
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