Personal computer

About: Personal computer is a research topic. Over the lifetime, 58809 publications have been published within this topic receiving 800814 citations. The topic is also known as: PC.

A Double-Stage Kalman Filter for Orientation Tracking With an Integrated Processor in 9-D IMU

Abstract: This paper presents an application-specific integrated processor for an angular estimation system that works with 9-D inertial measurement units. The application-specific instruction-set processor (ASIP) was implemented on field-programmable gate array and interfaced with a gyro-plus-accelerometer 6-D sensor and with a magnetic compass. Output data were recorded on a personal computer and also used to perform a live demo. During system modeling and design, it was chosen to represent angular position data with a quaternion and to use an extended Kalman filter as sensor fusion algorithm. For this purpose, a novel two-stage filter was designed: The first stage uses accelerometer data, and the second one uses magnetic compass data for angular position correction. This allows flexibility, less computational requirements, and robustness to magnetic field anomalies. The final goal of this work is to realize an upgraded application-specified integrated circuit that controls the microelectromechanical systems (MEMS) sensor and integrates the ASIP. This will allow the MEMS sensor gyro plus accelerometer and the angular estimation system to be contained in a single package; this system might optionally work with an external magnetic compass.

Simulation on the Rotational Vibration of Helical Gears in Consideration of the Tooth Separation Phenomenon (A New Stiffness Function of Helical Involute Tooth Pair)

Abstract: In this paper, an exact vibration model for helical gear pairs, is developed assuming no spacing error and no shaft run-out, in consideration of nonlinear tooth separation phenomenon. Inside the model, a simple modified stiffness function, including the effect of tooth numbers and addendum modification coefficients, is proposed for a helical involute tooth pair. This new stiffness function is verified by comparing its results with theoretical calculation and experiment. The rotational vibration of helical gear pairs with comparative narrow face width is simulated clearly on a 16-bit personal computer using the finite difference method in Fortran. The total contact ratio, including transverse and overlap contact ratios, is changed in the range of 1 ≤ e ≤ 3. As a result, the simulated vibration time waveforms and their frequency characteristics agreed precisely with Umezawa’s calculation and experiment. This simulator is also used to investigate the effect of shaft deviation and pressure angle errors on the vibration of helical gears.

The Role of Elaborations in Learning a Skill from an Instructional Text: Further Findings.

Abstract: : This paper examines the role of elaborations in learning a procedural skill (viz. using a personal computer) from and instructional text. Experiment 1 compared two sources of elaborations; those provided by the author and those generated by learners while reading. In the latter condition, subjects were given advance information about the tasks they were to perform so that they would generate more specific, task-related elaborations while reading. Each source of elaborations facilitated skill performance. This result contrasts with past experiments testing declarative knowledge in which author-provided elaborations were found to hurt performance. In Experiment 2, the author-provided elaborations were classified into those illustrating the syntax of the operating system commands and those explaining basic concepts and their applicability. Syntax elaborations produced significant facilitation for experienced and novice computer users. Concept elaborations produced no reliable improvement.

Distributed multiple irrigation controller management system

Abstract: Separate, but related, firmware programs for multiple microprocessor-controlled irrigation controllers (1) that are interrelated in their control of irrigation within an irrigation system are generated off-line at a personal computer (32). The programs are downloaded into a transportable memory device (30) that holds sixty-four separate programs. The memory device (30) is transported to each irrigation controller (1) and plugged to a digital communication channel (15). The device automatically identifies itself to the controller (1), and vice versa. The appropriate program is automatically uploaded from the device (30) to the controller (1). The controller's (1) old program and its historical irrigation record data is loaded into the device (30) and delivered to the personal computer (30) for validation and analysis. A wireless remote test command assembly (61), an extension maintenance panel (42), or a radio-link central module (50) may be alternatively connected to the controller's digital communication channel (15).