Washington — Workers who frequently drill concrete can experience reduced exposure to noise, silica dust and vibration if pneumatic rock drills are replaced with electric rotary hammer drills, according to researchers at the University of California, Berkeley.

The Knuckle Buster Anti-Vibe Glove is an arc-rated anti-vibration and impact-protective work glove featuring flame-resistant gel on both the palm and top of hand.

The Anti-Vibration Series now features six updated ProFlex models and one new model made with an innovative technology for workers exposed to vibrating tools and equipment.

Whole-body vibration occurs when mechanical energy oscillations are transferred to the body as a whole, commonly through a seat or platform.

Iowa City, IA — A NIOSH-funded study of farm machinery found that the machine operators experienced whole-body vibration at levels that reached the European Union’s “action level” for exposure limit within two hours of operation on nearly 30 percent of the equipment tested.

Addressing the demand for high stability of beamline instruments at the SHINE facility, a high stability mirror regulating mechanism has been developed for mirror adjustments. Active mass damping was adopted to attenuate pitch angle vibrations of mirrors caused by structural vibrations. An internal absolute velocity feedback was used to reduce the negative impact of spillover effects and to improve performance. The experiment was conducted on a prototype structure of a mirror regulating mechanism, and results showed that the vibration RMS of the pitch angle was effectively attenuated from 47 nrad to 27 nrad above 1 Hz.

Two years ago, a research team led by the University of Oxford revealed that, when plucked like a guitar string, spider silk transmits vibrations across a wide range of frequencies, carrying information about prey, mates and even the structural integrity of a web.

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Fluke Corp. introduces the Fluke 805 FC Vibration Meter, a portable multifunction vibration screening tool that provides quantifiable information on the bearing and overall health of motors and other rotating equipment, and shares that data in real time via Fluke Connect.

The Fluke 810 helps you locate and diagnose common mechanical problems and prioritize repairs. Tester includes laser tachometer, triaxial accelerometer and quick disconnect cable.

Location: Engineering Library- TA660.B4C44 2016

Location: Engineering Library- TA355.P235 2016

An off-the-shelf millimetre wave sensor can pick out the tiny vibrations made by a smartphone's speaker, enabling an AI model to transcribe the conversation, even at a distance in a noisy room

An off-the-shelf millimetre wave sensor can pick out the tiny vibrations made by a smartphone's speaker, enabling an AI model to transcribe the conversation, even at a distance in a noisy room

An off-the-shelf millimetre wave sensor can pick out the tiny vibrations made by a smartphone's speaker, enabling an AI model to transcribe the conversation, even at a distance in a noisy room

Lockdown has cut Britain's vibrations, seismologists find  The Guardian

European lockdown a boon to seismologists checking Earth's vibrations  E&T Magazine

Bone crystallite chemistry and structure change during bone maturation. However, these properties of bone can also be affected by limited uptake of the chemical constituents of the mineral by the animal. This makes probing the effect of bone-mineralization-related diseases a complicated task. Here it is shown that the combination of vibrational spectroscopy with two-dimensional X-ray diffraction can provide unparalleled information on the changes in bone chemistry and structure associated with different bone pathologies (phosphate deficiency) and/or health conditions (pregnancy, lactation). Using a synergistic analytical approach, it was possible to trace the effect that changes in the remodelling regime have on the bone mineral chemistry and structure in normal and mineral-deficient (hypophosphatemic) mice. The results indicate that hypophosphatemic mice have increased bone remodelling, increased carbonate content and decreased crystallinity of the bone mineral, as well as increased misalignment of crystallites within the bone tissue. Pregnant and lactating mice that are normal and hypophosphatemic showed changes in the chemistry and misalignment of the apatite crystals that can be related to changes in remodelling rates associated with different calcium demand during pregnancy and lactation.

Recently, researchers from Boston University and the Smithsonian Tropical Research Institute in Panama have been taking a closer look at the vibrations that red-eyed treefrog embryos use as cues to trigger early hatching. They discovered that treefrog embryos can evaluate different features of vibrations.

The post Researchers discover treefrog embryos can evaluate different features of vibrations appeared first on Smithsonian Insider.

The measures available to reduce the noise and vibration produced by trains have been outlined in a recent study. The researchers say the most appropriate mitigation should be determined on a case-by-case basis and life-cycle assessments can help analyse the economic costs and carbon footprint of different methods.

Columbia researcher examines how ultrasound could become part of a comprehensive treatment for various degenerative brain diseases.

A lock ring locking the surface and the improved design of internal structure increase resistance to vibration(3Z4S-LE VS-MCH Series)

A lock ring locking the surface and the improved design of internal structure increase resistance to vibration(3Z4S-LE VS-MCL / M42-10 Series)

Vibrations and shocks resistant lens for megapixel C-mount cameras(3Z4S-LE VS-MCA Series)

Vibrations resistant lens with iris plate system for megapixel C-mount cameras(3Z4S-LE VS-MCH1 Series)

For more than forty years Jan Gehl has helped to transform urban environments around the world based on his research into the ways people actually use — or could use — the spaces where they live and work.

In Cities For People (Washington : Island Press, 2010), his revolutionary new book, Gehl presents his latest work creating (or recreating) cityscapes on a human scale. He clearly explains the methods and tools he uses to reconfigure unworkable cityscapes into the landscapes he believes they should be: cities for people.

Taking into account changing demographics and changing lifestyles, Gehl explains how to develop cities that are lively, safe, sustainable, and healthy.

The book is extensively illustrated with over 700 photos and drawings of examples from Gehl’s work around the globe. Jan Gehl is based in Copenhagen.

Intelligent Transportation Systems, or ITS, integrates different computing, control, and communication technologies to help monitor and manage traffic management that helps reduce congestion while saving lives, time, and money.

While mobility and safety are the primary objectives of any good transportation system, security has also become an equally important consideration in their design and operation.

This new work, Transportation Infrastructure Security Utilizing Intelligent Transportation Systems (Hoboken, NJ : Wiley, 2008), provides a comprehensive treatment of techniques to leverage ITS in support of security and safety for surface transportation infrastructure.

Through the book's multidisciplinary approach, readers gain a comprehensive introduction to the diverse aspects of transportation infrastructure security as well as how ITS can reduce risks and be protected from threats with such topics as computer systems, risk analysis, and multi-modal transportation systems.

This book, which will serve as a textbook and guide, provides:

• Current ITS approaches to security issues such as freight security, disaster and evacuation response, HAZMAT incidents, rail security, and ITS Wide Area Alerts
• Guidance on the development of a regional transportation security plan
• Securing ITS itself and privacy issues involved in any collection and use of personally identifiable tracking data
• Exercises, question-and-answer sections, and other helpful review tools for the reader

Filling a gap in the practical application of security, this book offers both students and transportation professionals valuable insights into the new security challenges encountered and how to manage these challenges with the use of computerized transportation systems.

Railways are an environmentally friendly means of transport well suited to modern society.

However, noise and vibration are key obstacles to further development of the railway networks for high-speed intercity traffic, for freight and for suburban metros and light-rail.

Railway Noise And Vibration: Mechanisms, Modelling And Means Of Control (Amsterdam : Elsevier, 2009) brings together coverage of the theory of railway noise and vibration with practical applications of noise control technology at source to solve noise and vibration problems from railways.

Each source of noise and vibration is described in a systematic way: rolling noise, curve squeal, bridge noise, aerodynamic noise, ground vibration and ground-borne noise, and vehicle interior noise.

This work also discusses in full the theoretical background and practical workings of railway noise, including the latest research findings, and forms an extended case study in the application of noise control techniques.

Author David Thompson is Professor of Railway Noise and Vibration at the Institute of Sound and Vibration Research, University of Southampton (U.K.).

A device for damping vibrations in a drive train, in particular for plug screws in the pulp and paper industries. The device is principally characterized in that a cylindrical shaft, preferably designed as a hollow shaft, is provided, wherein the cylindrical shaft is arranged between the halves of a coupling and at least one ring having friction surfaces is arranged around the cylindrical shaft. Stick-slip vibrations that occur can thereby be favorably eliminated, and thus the gearbox and the motor of the drive train can be protected.

A rotational vibration damper includes a primary side (32) and a secondary side (46) which is rotatable with respect to the primary side (32) around an axis of rotation (A) against the action of a damper element arrangement (28). At least one damper element unit (42) of the first group (70) and at least one damper element unit (42') of the second group (70') are pre-loaded, and the primary side (32) and the secondary side (46) are pre-loaded in a basic relative rotation position with respect to one another. Proceeding from the basic relative rotation position of the primary side (32) with respect to the secondary side (46), a pre-loading path (V, V') of at least one pre-loaded damper element unit (42) is shorter than a maximum relative rotation path of the primary side (32) with respect to the secondary side (46).

A torsional vibration damping device is configured to have hysteresis torques in the positive and negative sides varied by a simple construction, thereby improving the efficiency of production work and preventing an increase in production cost. Friction materials are respectively provided on surfaces of a hub member and the disc plates, the surfaces facing each other in the radial direction when the hub member is twisted in the positive side with respect to the disc plates. The friction materials are to be brought into friction contact with each other when the hub member is twisted by a specific angle with respect to the disc plates.

A compact disc (CD) player, which comprises playback substrates, a conveying roller, CD sensors, a CD stopper, a first trigger member, frame members, cam members and moving members, wherein the CD stopper has a major axis and abutting portions disposed at both ends of the axis; the first trigger member rotates when a minor-diameter CD stops at a mounting position on a turntable; the frame members receive the movement of the first trigger member; the cam members are coupled to the frame members; the moving members receive the rotation of the CD sensor and move along the outside diameter of a CD; the moving members are provided with clamping portions and abutted portions configured to be clamped with the abutting portions; and the cam members are provided with clamped portions configured to abut against the clamping portions.

Systems and methods are provided that may be implemented to provide a mechanical indicator to correlate magnetic disk drive IOP performance with features of mechanical and/or acoustic vibrational frequencies that are generated and captured or sensed outside of the disk drive itself. In one example, disk drive PES data may be collected concurrently with the capture of mechanical and/or acoustic vibrational data at different and progressive locations of vibration source, vibration path and vibration receiver in a disk drive operating environment, e.g., such as for disk drives installed within a server and/or storage chassis enclosure. In such case, PES threshold may be utilized to correlate performance of Drive IOP or drive servo-mechanical performance as a function of measured characteristics of vibration source/s that impart vibration to a disk drive.

A vibration-damping plain bearing composite comprising a sliding layer, a dimensionally stable support layer and an elastic layer. In one embodiment, the dimensionally stable support layer is arranged between the sliding layer and the elastic layer; in another embodiment, the elastic layer is arranged between the sliding layer and the dimensionally stable support layer. The bearing composites are characterized that a ratio of the thickness of the elastic layer tEL to a thickness of the sliding layer tSL is at least 3.

An anti-vibration rubber member includes: a rubber elastic body that is made of a self-lubricating rubber containing an elastomer and a bleeding lubricant; a coating film that covers at least a portion of a sliding inner surface that is among a surface of the rubber elastic body and disposed on an inner side of the sliding surface, contains a resin having a mercapto group, is deformable to follow up deformation of the rubber elastic body, and is formed with a plurality of minute holes capable of reserving the bleeding lubricant which has oozed out of the rubber elastic body; and a lubricating film that covers at least a portion of a surface of the coating film, is formed to include the bleeding lubricant penetrating the coating film from the rubber elastic body and oozing onto the surface of the coating film, and forms at least a portion of the sliding surface.

The present invention relates to a bit for processing the inside diameter of a work material, the bit having on the outer surface of a shank a vibration preventing structure comprising a vibration absorption body made of a silicone material, and a hollow wire rod, thereby absorbing the vibration generated from a machine tool, preventing resonance generated between the work material and a tool, and thus, enabling the implementation of a slickenside from ultra-precision machining.

A vibration dampener for a camera mount is structured to reduce the movement of a first mount component relative to a second mount component. An upper camera mount component securing a camera couples to a lower camera mount component, which in turn couples to a base mount component configured to couple to a user, a sports board, a helmet, a vehicle, and the like. The vibration dampener is compressibly inserted between the lower mount component and the base mount component, causing the vibration dampener to exert an outward force on the lower mount component, and securing the lower mount component against a portion of the base mount component. The movement of the lower mount component relative to the base mount component is accordingly reduced by the vibration dampener.

An apparatus includes a housing, a rotational motor situated within the housing, an eccentric load adapted to be rotated by the rotational motor, and a plurality of legs each having a leg base and a leg tip at a distal end relative to the leg base. The legs are coupled to the housing at the leg base and include at least one driving leg constructed from a flexible material and configured to cause the apparatus to move in a direction generally defined by an offset between the leg base and the leg tip as the rotational motor rotates the eccentric load.

An intra-cavity frequency doubled OPS-laser includes a laser-resonator terminated by a plane mirror and a mirror-structure of an OPS-chip. The resonator is folded by three fold-mirrors. The fold-mirrors are supported on a vibration-isolation plate supported by isolation posts above a base-plate. The plane mirror and the mirror-structure of the OPS-chip are mounted back to back on opposite parallel surfaces of a mounting block. The mounting-block is supported on the base-plate and extends through an aperture in the vibration-isolation plate. Movement of the vibration-isolation plate with respect to the base-plate does not change the resonator length.

A vibration-isolating screw is disclosed. The vibration-isolating screw includes a screw head and a screw tail portion. The screw head includes a first screw body, a first magnetic element, a second screw body, a second magnetic element, a third screw body and a third magnetic element. The first magnetic element and the second magnetic element are mounted on the first screw body and the second screw body, respectively. The third screw body is mounted between the first screw body and the second screw body. The third magnetic element comprises a first end and a second end and is mounted on the third screw body. The first end and the first magnetic element are adjacent and mutual repulsion. The second end and the second magnetic element are adjacent and mutual repulsion. The screw tail portion is connected with the second screw body.

A vibration element includes a piezoelectric substrate including a vibrating section and a thick section having a thickness larger than that of the vibrating section. The thick section includes a first thick section provided along a first outer edge of the vibrating section, a second thick section provided along a second outer edge, and a third thick section provided along another first outer edge. An inclined outer edge section that intersects with each of an X axis and a Z' axis is provided in a tip section of the piezoelectric substrate.

In a machine tool having a rotary shaft for use in rotating a tool or a workpiece, a plurality of stable rotation speeds at which the chatter vibrations are expected to be suppressed, and at least one switching rotation speed across which a dynamic characteristic of a rotary shaft system changes are stored. The plurality of stable rotation speeds may be determined from chatter vibrations detected using a vibration detection unit. Optimum rotation speed that is a rotation speed to which a rotation speed of the rotary shaft is changeable without crossing the switching rotation speed is selected from the plurality of stable rotation speeds, and the rotation speed of the rotary shaft is changed to the optimum rotation speed. Thus, chatter vibrations generated during rotation of the rotary shaft can be suppressed effectively.