Motion Control

Computation of Wing Deflection and Slope from Measured Strain

Patent-pending methodology computes detailed wing loads during actual flight. Armstrong Flight Research Center, Edwards, California A lightweight, robust fiber-optic system is the technology behind a new method to compute wing deflection and slope from measured strain of an aircraft. This state-of-the-art sensor system is small, easy to install, and fast, and offers the first-ever means of obtaining real-time strain measurements that can accurately determine wing deflection and slope during flight. Such measurements are particularly useful for real-time virtual displays of wing motion, aircraft structural integrity monitoring, active drag reduction, active flexible motion control, and active loads alleviation.

Posted in: Articles, Briefs, Aeronautics, Aerospace, Aviation, Motion Control, Measuring Instruments, Wings

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Naval Shipyard Automates Dry Dock Operation

Pearl Harbor Naval Station and Hickam Air Force Base have grown up together around the historic port known as Wai’Momi, adjacent to Honolulu. Pearl Harbor Naval Shipyard (PHNSY), located at Joint Base Pearl Harbor-Hickam, is a one-stop regional maintenance center for the Navy’s surface ships and submarines. It is the only intermediate maintenance facility for submarines in the Middle Pacific.

Posted in: Application Briefs, Motion Control, Maintenance, repair, and service operations, Automation, Marine vehicles and equipment

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Wing-Flapping Aircraft Hovers and Flies

Life-sized, hummingbird-like, unmanned surveillance aircraft weighs two-thirds of an ounce, including batteries and video camera. The Nano Hummingbird is a miniature aircraft developed under the Nano Air Vehicle (NAV) program funded through the Defense Advanced Research Projects Agency (DARPA). DARPA was established to prevent strategic surprise from negatively impacting U.S. national security, and to create strategic surprise for U.S. adversaries by maintaining the technological superiority of the U.S. military. The agency relies on diverse performers to apply multidisciplinary approaches to advance knowledge through basic research, and create innovative technologies that address current practical problems through applied research.

Posted in: Application Briefs, Motion Control, Product development, Military aircraft

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Motion Control System Gives Farmers a Hands-Free Approach in Vehicles

The important job of a farmer requires long hours of field work. The often monotonous tasks of driving agricultural vehicles to work long rows in the field — whether it be planting, maintenance, or harvesting — is undeniably arduous and fraught with potential for human error. With advances in the development of mechanical steering devices, farmers can now program steering patterns to allow their vehicles to operate hands-free and more accurately than ever before.

Posted in: Application Briefs, Motion Control, Steering systems, Human factors, Agricultural vehicles and equipment

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Compact Active Vibration Control System

A highly directional actuator can be shaped so that it couples to the response of a flexible structure in the same manner as point sensors.This innovation consists of an analog controller, diamond-shaped patch actuator, and point sensors (such as accelerometers). The actuator is designed to couple to the flexural response of the structure in the same manner as a group of point sensors. This results in a co-located transducer pair. The signals from all sensors are combined, filtered, and amplified within the analog controller. The resulting signal is then applied to the actuator, which generates a control force out-of-phase with the measured response. Because the transducers are co-located, the vibration control system is inherently robust to variations in properties of the underlying structure that is being controlled. This type of control system actively suppresses the vibration of a flexible structure using surface-mounted transducers without any external mechanical connections.

Posted in: Briefs, TSP, Motion Control, Electronic control systems, Vibration

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Deep Throttling Turbopump

Advancement in space exploration necessitates deep throttling of liquid cryogenic rocket engines. Both lunar and Martian robotic and human exploration require engines that can be deep throttled,can start and restart, have a long life, and require minimal maintenance. An engine that is capable of deep throttling at low thrust levels and is versatile enough to accommodate multiple applications would advance the state of the art and enable NASA to meet space exploration objectives. An advanced partial emission turbo pump design is an enabling technology for developing such low thrust level engines. This will complement the current state-of-the-art full emission pump technology.

Posted in: Briefs, Motion Control, Rocket engines, Throttles

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Analyzing Rollover Stability of Capsules With Airbags Using LS-Dyna

This method interpolates data to predict the stability boundaries for a capsule on airbags.As NASA moves towards developing technologies needed to implement its new Exploration program, studies conducted for Apollo in the 1960s to understand the rollover stability of capsules landing are being revisited. Although rigid body kinematics analyses of the rollover behavior of capsules on impact provided critical insight to the Apollo problem, extensive ground test programs were also used. For the new Orion spacecraft, airbag designs have improved sufficiently for NASA to consider their use to mitigate landing loads to ensure crew safety and to enable reusability of the capsule.

Posted in: Briefs, TSP, Motion Control, Stability control, Airbag systems, Spacecraft

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