A stockbridge damper is a tuned mass damper used to suppress windinduced vibrations on slender structures such as overhead power lines and long cantilevered signs. Ctc and fci will be able to identify the need for stockbridge dampers or spacer damper and their location depending on the span application. Moreover, sample stockbridge damper characterization tests, which then could be introduced to the software, are performed. The most effective protection device was invented by george stockbridge in 1924 in the form of an inertial energy absorber equipped with a stranded steel cable holding two weights.
Stockbridge obtained us patent 1675391 on 3 july 1928 for a. Twelve groups of additional stockbridge dampers were installed along the entire span to obtain mid span damping of the fjord crossing. Damper, spacer and spacer damper requirements are illustrated on the line from span lengths given showing the number of motion control accessories and their location per span. Safeair dowcos installation notes are applicable to fire dampers, smoke dampers and combination dampers on most occasions. Modern spacer dampers are characterized by an accurate coordination between the inertial and elastic damping properties. Performed transient response analysis of stockbridge vibration dampers for opgw applications.
These dampers safely and reliably decelerate rotary movements without unwanted recoil effects. If you would like to learn more about the benefits of home automation hvac zone control for your stockbridge, mcdonough, peachtree city, griffin, jackson, dunwoody, conyers, atlanta, ga or surrounding area home, call the experts at jones climate control today. Plp has developed a proprietary computer program known as the vortx vibration damper placement software. When installed and adjusted in the air ducts, chimney or other air handling equipment of a structure, dampers can balance the air flow for each individual room. Home automation zoning stockbridge, ga jones climate. Standard control dampers wonder metals corporation. The aca stockbridge damper is the most efficient way to extend the life of a transmission line. Full text of extra high voltage transmission lines. Stockbridge damper are the most efficient way to extend the life of a transmission line. Vibration control of nuclear power plant piping system.
Design and testing of stockbridge vibration dampers. Stockbridge vibration dampers reduce this vibration therefore reducing the fatigue on accessories and enhancing the working life of the overhead line. Eliminates corrosion and improper installation with open design. For single conductors and shield wires, nes proposes a damping system based on vibration dampers of stockbridge type. In the proposed paper, effect of stockbridge damper to mitigate the response of piping system of npp subjected to earthquake is studied. Overhead lines requirements and tests for stockbridge type aeolian vibration dampers. A video clip of stockbridge damper installation on a hanger cable to demonstrate the effectiveness of stockbridge damper designed by tesolution. The dumbbellshaped device consists of two masses at the ends of a short length of cable or flexible rod, which is clamped at its middle to the main cable. Investigation of stockbridge dampers for vibration control of overhead transmission lines kasap, huseyin m. Fargo 4r stockbridge vibration dampers effectively prevent fatigue damage to conductor and static wires caused by windinduced aeolian vibration. They had the portable oscillation dampers on that installation. Design and testing of stockbridge vibration dampers by dharmbir prasad, santosh kumar singh and gautam agarwal concept of wind induced oscillations oscillations in conductors occur due the following phenomena. Finite element modeling of 400 kv ers bypass transmission line quantifying installation difficulty.
Sep 28, 2017 a stockbridge damper system can control the aeolian vibrations in a transmission line by dissipating excitation energy through the selfexcitation of the damper system. The pfisterer spacer dampers are available with two different clamp designs. The crews also installed monitoring equipment on two phases of the line, cat1 system. Stockbridge damper vortx vibration damper preformed. Immediately note any damage and inform your representative. The stockbridge damper was invented in the 1920s by george h. All accessories were designed and fully tested with 795kcmil accr conductor in the laboratory prior to the field installation in fargo. These dampers are designed to work in both orientations with acceptable performance. Stockbridge damper vortx vibration damper preformed line.
The method is applied to a stockbridge damper and a simple picture is presented of the way in which this damper works. Rigid spacersa vital part of transmission projects. The six strain gauges around the periphery of the aluminium tube are connected in two opposite arms of a bridge circuit with three gauges in each arm connected in series. Do not cast damper in place do not fasten retaining angles or damper directly to wall cycle damper after installation to insure free movement do not install damper out of square or out of flat install damper in plane of fire separation. Acceptable performance of dampers must be maintained for a wide range of excitation frequencies, which have a correspondence with the wind velocity. An iterative finitedifference scheme is derived to predict the vertical, steadystate, monofrequent, aeolian vibration of a single conductor span with a stockbridge type damper attached.
These designs are available for all configurations from two to twelve conductors. Stockbridge vibration dampers for overhead power lines see other formats disclosure to promote the right to information whereas the parliament of india has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote. Aeolian vibration control measures for ground wires of han. Damper installation for typical fire rated partition damper installation for typical flange termination with grille register a. Therefore, locating these resonant frequencies is a critical design consideration for a stockbridge damper to determine the efficiency of spectral energy dissipation. A wide variety of stockbridge damper options are available to you, such as standard. Models fsd60fa, fsd60fam, and fsd36fa combination fire smoke dampers are ideal for shaft wall applications. A new method is presented for determining the effectiveness of dampers used to suppress aeolian vibration on overhead lines. Introduction of pfisterer software for analytical vibration damping studies 1991.
Plp has developed a proprietary computer program known as the vortx vibration damper placement software or vortx vdp for short. See the complete profile on linkedin and discover jons connections. I didnt nail the mix on this video, but it is fixed on subsequent videos. Thanks to all for their nice inputs which helped me out to understand the function of stockbridge dampers. Rigid spacers keep the subconductors within a span and in jumper loops at designed spacing to avoid damage caused by clashing, twisting or entwining. Ftt has developed a software program to handle custom specifications for cable, other accessories, panels and cabinets assemblies. For extra high voltage and ultra high voltage lines equipped with bundles of two, three, four, six and eight conductors spaced from 200 mm to above mm, nes can supply a wide range of spacer dampers and flexible spacers covering all the possible. Life400 is an easy to use software that contains all functions needed to operate the vr400 recorders and to display the measurement data in the form of tables and diagrams. Asms heating and air conditioning consultation services provide consumers with the information they need make educated decisions on their upcoming project. Slacan has been in the forefront of the development of spacer dampers and spacing systems since 1963. Generally the piping system of a nuclear power plant npp has to be designed for normal loads such as dead weight, internal pressure, temperature, and accidental loads such as earthquake. The following information may vary among different manufacturers and should not serve as a general guide of damper installation.
In principle, it is impossible to avoid windinduced conductor vibrations on overhead lines. Pfisterer has been developing spacer dampers since 1980 to provide the correct damping of windinduced vibrations for bundled conductor lines. Such dampers function by transferring the conductors vibration energy through the damper clamp to the messenger wire and weights. Installation instructions for stockbridge vibration dampers request form vibration information. What is something electrical engineers know that others. Manufacturer overview ftt future telecommunication. Vibration damper software vibration damper presentation. Mva power uses the latest techniques and computer software to detail design and manufacturing. Modeling the dynamic characteristics of slack wire cables in.
Stockbridgedampers 32 in overhead transmission lines which are used in damping windexcited oscillations. The vortx vibration damper reduces aeolian vibration the vortx vibration damper improves upon the established theory of the stockbridge damper invented in the 1920s. Weights made up of cast iron, clamp made up of aluminum alloy, nuts and bolts made up of galvanized or stainless steel and messenger cable made up of galvanized steel. The damper is designed to dissipate the energy of oscillations in the main. Ozgen september 2012, 92 pages this thesis aims to examine the performance of stockbridge dampers used to. Where motion control is a concern, rigid spacers are used in conjunction with stockbridge dampers to. The vibrec damper recommendation program assists in damper requirements for transmission and distribution lines. The damping mechanism is due to statical hysteresis resulting from coulomb dry friction between the individual wires of the cable undergoing bending deformation. Stockbridge dampers with cast or forged clamps vibration. Dogs bark at cars wheels because the engine produces highpitch noises that humans cant hear, but dogs identify as a frightened dog inside. The 4r concept improves on the design of the basic stockbridge damper, significantly increasing the efficiency of converting windinduced energy into heat. Stockbridge type damper effectiveness evaluation, part i. Installation instructions fsd60fa, fsd36fa, and fsd60fam.
Acceptable performance of dampers must be maintained for a wide range of excitation frequencies, which. Design sensitivity analysis of a stockbridge damper to. Stockbridge dampers excellence in aeolian vibration damping stockbridge damper with bolted clamp stockbridge dampers key data features general pfisterer has been one of the manufacturers who actively contributed, during the last 50 years, to the enhancement of the stockbridge damper. It is designed to eliminate the damage caused by aeolian vibration. Stockbridge dampers were installed on the entire line to provide overall protection to the conductor support, suspension insulators and the towers.
Spacer dampers, stockbridge dampers, recorders and warning. Stockbridge damper installation on a hanger cable close. In the most unfavourable cases, fractures caused by vibrations on accessories and overhead lines occur. Applies to stockbridge type aeolian vibration dampers intended for single conductors or earth wires or conductor bundles where dampers are direclty. Combination firesmoke dampers must meet the test requirements for both ul test standards. However, there is no method for calculating the power dissipated by wire dampers even though the calculation theory for stockbridge dampers is comparatively mature 56. Vibration control of nuclear power plant piping system using. Comparative testing was conducted in 1993 at a private test site using afl stockbridge dampers and those of two competitors.
Transmission conductor vibration dampers stockbridge type 1700 series. For the correct installation and tightening of the bolt, the use of a calibrated torque wrench is mandatory. Damping of aeolian vibration on overhead lines by vibration dampers. Stockbridge dampers are devices extensively used to reduce vibration amplitude on electric lines due to wind, avoiding the risk of fatigue on the line. Also, a lower panel was added to permit remote control. Before installation check any physical damages on the dampers. Dynamics of stockbridge dampers 215 to improve the sensitivity of the load cell, the thickness of the aluminium tube in the central region is made very small 1. Based on these tests, dampers are then given a fire rating, leakage rating or both for combination dampers. Installation instructions for air control dampers general upon receipt of the dampers at the site, inspect all items. Ruskin labor savers are ul approved products and installation methods for fire, smoke and combination firesmoke dampers that save. See wood stud andor steel stud framing for fire dampers in drywall andor cavity shaftwall partitions supplemental installation instructions for further vertical. In stockbridge dampers of transmission line, mechanical energy is dissipated in wire cables damper or messenger cables. Ingenieria mecanica tecnologia y desarrollo optimal design of stockbridge dampers abstract stockbridge dampers are devices extensively used to reduce vibration amplitude on electric lines due to wind, avoiding the risk of fatigue on the line.
From this information, vibrec determines how many afl stockbridge vibration dampers, speedgrip spacers, or afl bundled spacer dampers will be required for each. A fair hvac installation cost can be hard to find these days. Aeolian vibration ieee conferences, publications, and. This is the most common type of vibration that results due to vortex shedding.
View pedram hashem dabaghians profile on linkedin, the worlds largest professional community. The abatement of the severity of aeolian vibration is a. Vibration dampers are used to absorb aolian vibrations of conductor of transmission lines, as well as ground wire, opgw, and adss. The cables of the transmission lines are prone to aeolian vibrations and oscillations. Determine the position of the damper to be fixed on the duct from the construction drawings. The dampers were reinstalled on a new section of conductor and the bolts were tightened to the maximum recommended torque 102 nm 75 ft.
Transmission conductor vibration dampers stockbridge type. Our engineering team have worldrenowned expertise in conductor vibration control, and we manufactures a leading range of spacers and spacer dampers for twin, triple and quad conductor configurations, and spacer dampers for larger bundles can also be supplied, and also a full range of stockbridge vibration dampers and high performance dogbone. Damper assemblies with catalog weights of 1706 and larger can be used at 345kv and above. The installation of wire dampers usually is based on qualitative analysis and simulation testing. Stockbridge, who was an engineer for southern california edison. Slacan spacer dampers are manufactured from high strength cast aluminum alloys with care given to ensure soundness and smooth surface finish. Dec, 2016 generally the piping system of a nuclear power plant npp has to be designed for normal loads such as dead weight, internal pressure, temperature, and accidental loads such as earthquake.
Afl blog proper orientation for stockbridge dampers. A custom test fixture is designed due to its unavailability of commercial. Dampers allow for climate control and energy efficiency by guiding the flow of warm and cool air throughout a building. This provides maximum effectiveness in controlling the levels of subconductor motions. Stockbridge vibration dampers border states electric.
Hvac installation cost 2019 whats a fair price for a. Introduced new validation technique using software tools of stockbridge vibration dampers for opgw applications. Jones climate control is a familyowned heating and cooling company that. View jon potters profile on linkedin, the worlds largest professional community. Dulhunty power spacer dampers are available for twin, triple, quad and 6 conductor bundle arrangements and are suitable for. Restricting wind induced vibrations of transmission line for uninterrupted power supply using vibration dampers the interruption of electricity due to failure of transmission lines can trigger social and economic calamities. Afls high efficiency stockbridge dampers can work with two orientations 1 the small weight can be oriented away from the structure and 2 the small weight can be oriented toward the structure. Stockbridge dampers are more useful for high frequency vibrations flutter, 10hz or so. Installation costs can be reduced thanks to its simple installation. Control of wind induced instabilities through application. Spacer dampers, stockbridge dampers, recorders and warning spheres page 1 of 1 28. Finite element analysis of piping system with and without stockbridge. Power transmission lines question cr4 discussion thread. The improved design employs unequal weights on messengers of unequal.
A bill of material is stored for each customers cable i. See wood stud andor steel stud framing for fire dampers in drywall andor cavity shaftwall partitions supplemental installation instructions for further vertical installation details. The sphere is available in various colours and for several conductor diameters. Fatigue failures of overhead conductor strands due to windinduced vibrations were observed since the beginning of the last century. Once again the dampers were removed and the conductor inspected. For spacer dampers in bundled lines, mosodrfer is cooperating with damp s. The information required with respect to the line configuration is available in appendix d. Damper installation for typical flange termination with grille reg is ter a.
Find vibration damper related suppliers, manufacturers, products and specifications on globalspec a trusted source of vibration damper information. Apr 01, 2017 the stockbridge damper was invented in the 1920s by george h. Dampers alcoa stockbridge dampers 17047 insulator type polymer results and. Quad spacer damper and its optimized installation by using a analytical software. They are designed so that their mechanical impedance matches the optimum damper impedance determined for the cable to be protected as closely as possible. Vortx dampers are tested in accordance with iec 61897. The improved design employs unequal weights on messengers of unequal length. A stockbridge type damper was mounted to test its efficiency and visual tests after the installation of the damping device showed an almost total. Fix the damper with flange or nuttbolt and apply duct sealant. Media in category stockbridge dampers the following 57 files are in this category, out of 57 total.
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