Keyword: Dampers and shock absorbers

Briefs: Aerospace
Applications include absorbers, tuned mass dampers, harmonic absorbers, and seismic dampers.
Briefs: Mechanical & Fluid Systems
Fluid-Filled Frequency-Tunable Mass Damper

Innovators at Marshall Space Flight Center developed the fluid-filled Frequency-Tunable Mass Damper (FTMD) technology that allows for significant distribution of loads while also providing a simple mechanism that allows for the capability to change its frequency of mitigation with negligible impact on...

Briefs: Test & Measurement

Materials scientists are looking to nature — at the discs in human spines and the skin of ocean-diving fish — for clues about how to design materials with both flexibility and stiffness. The...

Briefs: Mechanical & Fluid Systems

Tuned mass dampers are used worldwide to mitigate vibrations in structures like buildings and bridges where excessive movement can be alarming or even sickening to occupants. The...

Application Briefs: Robotics, Automation & Control

Shock absorbers are important parts of vehicles. The shock absorber is used to observe the vibrations from shock loads due to irregularities of the road surface, and operates without affecting the...

Briefs: Mechanical & Fluid Systems

NASA Marshall Space Flight Center’s Fluid Structure Coupling (FSC) technology is a highly efficient and passive method to control the way fluids and structures communicate and dictate the behavior of a system. This...

Briefs: Robotics, Automation & Control
Variable-Aperture Reciprocating Reed Valve

NASA’s Marshall Space Flight Center engineers have developed a new reed valve for controlling fluid flow back and forth between two chambers. The VARR valve provides two-way flow that is proportional to flow demand. As the pressure gradient builds on one side, the reed valve responds by opening an...

Briefs: Propulsion

This technology is based on a model-scale experiment simulating a test facility where an engine exhaust is discharged into a duct....

Articles: Lighting

The key circuit elements in an LED lamp are the LEDs, the optics, the casing (including heat-sinking) and the driver. The driver now represents anywhere from 10% to 40% of total bulb cost, so selecting the...

Briefs: Mechanical & Fluid Systems

A complete, tested, and tunable shock and vibration suppression device is composed of statically compressed chains of spherical particles. The device superimposes a combination of...

Articles: Manufacturing & Prototyping
LIFE PACK Hypothermia Prevention

Floatation Device Dwight and Jane Cushman, Village Memorial, Portland, OR

Even with floatation gear, when a person who is not prepared...

Briefs: Mechanical & Fluid Systems
Dampers for Stationary Labyrinth Seals

Vibration dampers have been invented that are incorporated as components within the stationary labyrinth seal assembly. These dampers are intended to supplement other vibration-suppressing features of labyrinth seals in order to reduce the incidence of high-cycle-fatigue failures, which have been known to...

Articles: Automotive

Hours before most commuters start their engines and head to work, James Hughes is already calling the other side of the world from his office in Dearborn, MI. Because of a...

Briefs: Information Technology
Improved Model of a Mercury Ring Damper

A short document discusses the general problem of mathematical modeling of the three-dimensional rotational dynamics of rigid bodies and of the use of Euler parameters to eliminate the singularities occasioned by the use of Euler angles in such modeling. The document goes on to characterize a Hamiltonian...

Application Briefs: Motion Control

There’s a science to testing metal structures for rigidity and performance under stress. The development of new testing methodologies is continuing at a fast pace, aided...

Briefs: Electronics & Computers

Systems to provide improved tactile feedback to aircraft pilots are being developed to help the pilots maintain harmony between their control actions and the positions of aircraft control...

Briefs: Physical Sciences

A method of cleaning the mode spectra of whispering - gallery - mode (WGM) optical resonators has been devised to make such resonators more suitable for use as narrow-band optical...

Articles: Photonics/Optics

Photonics Tech Briefs (PTB) recently presented the 2005 Readers’ Choice Products of the Year at a special awards dinner held at The Water Club in New York City. The top three...

Briefs: Mechanical & Fluid Systems
Oscillating-Linear-Drive Vacuum Compressor for CO2

A vacuum compressor has been designed to compress CO2 from ˜1 psia (˜6.9 kPa absolute pressure) to ˜75 psia (˜0.52 MPa), to be insensitive to moisture, to have a long operational life, and to be lightweight, compact, and efficient. The compressor consists...

Briefs: Motion Control

In the area of maintaining conventional motorcycle stability, engineers have established a series of tests that measure the wobble, weave, and kickback of every new model before it is released...

Briefs: Mechanical & Fluid Systems
Using ERF Devices To Control Deployments of Space Structures

A report proposes devices containing electrorheological fluids (ERFs) damper for controlling deployments of lightweight, flexible structures in outer space. The structures would include spring members that could be wound or compressed for compact stowage during transport. The ERF based...

Briefs: Mechanical & Fluid Systems

Improved energy- absorbing wheels are under development for use on special-purpose vehicles that must traverse rough terrain under conditions (e.g., extreme cold) in which rubber pneumatic tires would...

Briefs: Mechanical & Fluid Systems

Simple viscoelastic dampers have been invented for use on the root attachments of turbomachine blades. These dampers suppress bending- and torsion-mode blade vibrations, which are...

Briefs: Motion Control
Progress in Magnetoelastic Vibration Dampers

A report describes uniaxial-stress-versus-strain experiments that were performed on polycrystalline Tb76Dy24 alloy specimens. [Also see "Magnetoelastic Vibration Dampers" (NPO-20988) on page 56 of this issue.] The proposal is to use Tb-Dy alloys as vibration-damping materials at...

Briefs: Motion Control
Magnetoelastic Vibration Dampers

Magnetoelastic dampers have been proposed for use in suppressing vibrations of large motors and transformers that operate at temperatures below 100 K. [Also see "Progress in Magnetoelastic Vibration Dampers," (NPO-20887) on page 57 of this issue.] These dampers would be made of magnetostrictive materials -...

Briefs: Motion Control

Self-tuning impact dampers have been proposed as improved means for suppressing vibrations in the rotor blades of turbomachines (turbines and compressors). Dampers are needed because...

Briefs: Software
Program for Simulating Rotor Dynamics on Personal Computers

ARDS (Analysis of RotorDynamic Systems) is a public-domain computer program that simulates transient and steady-state dynamics of a rotary machine that can include as many as five interconnected flexible shafts. ARDS can be used to analyze the dynamics of such diverse machines as...

Briefs: Mechanical & Fluid Systems

A methodology of active control has been developed in an effort to alter (preferably to reduce) the tendency of a four-wheel land vehicle to roll over during tight turns and...

Briefs: Robotics, Automation & Control

A laboratory apparatus called a "vacuum damper investigation and performance evaluation robot" ("V-DIAPER") affords capabilities for vacuum dynamic testing of torsional dampers. The apparatus...