I have ordered damping grease online from japan, but i just cant find the real deal, the stuff that actually replicates the original. Safety data sheets safety data sheets are available for download from our website. Damping definition and meaning collins english dictionary. Damping grease allows engineers to adjust the torque to actuate a device to craft the user experience economically. I had also cleaned up some of the slides on the scope because they were a bit gritty. Structural dynamics department of civil and environmental engineering duke university henri p. In the 1930s, damping grease played a pivotal role in transforming delicate, expensive 35mm cameras into a rugged and affordable consumer product. A video demonstrating how motion can be controlled with the use of a damping grease. Damping grease demonstration 2012 i was recently refurbishing a microscope and made an adjustable eyepiece the original eyepiece didnt have any diopter adjustment. How different levels of damping capacity affect vibration decay 08 1. Vibration and sound damping in polymers v g geethamma, r asaletha, nandakumar kalarikkal and sabu thomas excessive vibrations or loud sounds cause deafness or reduced efficiency of people, wastage of energy and fatigue failure of machinesstructures. The level of damping can be subjectively determined by noting the sharpness of resonant peak at f 1 figure 3. Since id removed the magic sticky grease, they now moved far too easily.
Damping grease noise reduction grease motion control. Previous investigations led to an empirically derived method, a ruleofthumb, to estimate load capacity. Pdf damping properties of plastic with temperature variation. A damping grease is a costefficient way to control free motion, achieve a quality feel, reduce noise, and enable fine tuning by hand in most any mechanical and electromechanical device. The characteristic feature of greases is that they possess a high initial viscosity, which upon the application of shear, drops to give the effect of an oillubricated bearing of approximately the same viscosity as the base oil used in the grease. Then newtons second law gives thus, instead of the homogeneous equation 3, the motion of the spring is now governed. This method has been a valuable tool in system development. Jul 01, 2016 eddy current damping, air friction damping, fluid friction damping, methods of damping, damping system,damping system in measuring instruments, damping system types, types of damping pdf, types of damping in measuring instruments, types of damping in civil engineering, damping system in structural dynamics, types of damping system, types of damping ppt. Modelling, analysis and damping of vibrating structures which was published in 1983 but is now out of print. It should have a high melting point, and operate well at continuous. Suitable for extreme damping applications, the pg44a is a nlgi 5 grease and is so stiff grease that generally the product is not sold in tubes due to the force required to dispense the grease.
A silica thickened, light viscosity, synthetic hydrocarbon grease intended for mechanical components that require a light level of damping. Cooling occurs by removing either the heat from the environment, e. Nyecorr 140 is the most advanced pfpe lubricant, the most environmentally friendly, and the most economical option available to the corrugating industry today. Earle, 1942 good multipurpose lubricating grease has to perform well in a number of applications. Damping greases, also referred to as motion control grease or noise control grease, reduce wear, seal out moisture and dust, and enhance motion control. Arcanol rolling bearing greases for reliable, durable and. Sometimes called antisway or antiroll bars, stabilizer bars keep the car 4 intermediate shaft of an automotive steering column is controlled when a damping grease. While the original question was in reference to lubing focusers, i want to point out that this is an especially important topic for anyone using an older eq mount that employs plain bearings for the declination and ra shafts. The amount of force required to move a device lubricated with damping grease can be controlled by proper selection of base oils.
A template is helpful when trying to achieve a professional look. It dissipates vibrational energy in the structure before it can build up and radiate as sound. More subjectively, damping greases are selected for the feel the designer wants to achieve. Using the right damping grease can reduce engineering. The technical name of the stuff that goes inside a potentiometer is damping grease. Hertzian contact, defective bearing, lubricating grease, damping coefficient, vibration resp onse. Higher molecular weight oils create greater internal shear resistance, which requires more torque. Classical damping, nonclassical damping and complex modes cee 541. High damping is desirable to attain low vibration and noise levels whereas low damping is desirable for increased sensitivity in sensors and certain precision instrumentation. Structural damping structural damping reduces both impactgenerated and steadystate noises at their source. The amount of force needed to shear a damping grease is determined by the viscosity of the base oils chosen for the formulation. Noise controls absorbers applied at a reflective surface to absorb energy and reduce reflection of.
Apr 24, 2017 damping grease is used to control motion and noise in engineering applications. Boom mat damping material thermal acoustic control instructions. Damping is most obvious at resonance where the stiffness and inertia forces become equal. Nye lubricants 795a ng synthetic damping grease 2oz. Pdf oil film stiffness and damping in an elastohydrodynamic. Damping greases control motion, acoustics, and feel of mechanical parts damping grease started in optics. Pdf an elastohydrodynamic lubrication line contactvibration model is proposed to study the. Extremely high viscosity fluid and grease damping lubricants values quoted above are typical and do not constitute a specification. The noiseless motion of metal on metal, the smooth feel, and the absence of coasting and backlash of focus controls on cameras and optical instruments are all the work of damping grease until the 1960s, damping grease had few. Pdf research on effect of damping variation on vibration. Automotive stabilizer bar bushings also employ siliconebased damping grease. Most of the multipurpose greases have a soap base of barium, lithium, or calcium complex. Limits motions controlled by energy balance resonance broad band spatial resonance trace matching free vibrations. Damping grease quiets the plastic gears and reduces mechanical noise from the cables.
Pfpeptfe grease, a unique synthetic grease made by com bining a fluorinated oil. Page 1 of 4 where can i get the real sticky damping grease posted in classic telescopes. As a result, damping is a key factor in predicting vibration response of structures. Jun 23, 2016 a new, expanded damping grease sample kit is now available from nye lubricants, inc. Research on effect of damping variation on vibration response of defective bearings article pdf available in advances in mechanical engineering 1. The grease forms a sealing grease collar against moisture and dirt particles between the opposing body. A damping grease allows instruments to be more exact and operate smoothly. Damping grease an engineering tool for economical noise and motion control uniflor pfpe lubricants the most complete line of pfpe lubricants for extreme environments. Classical damping, nonclassical damping and complex modes. Uniflor perfluoropolyether pfpe lubricants are designed for.
Using the right damping grease can reduce engineering and production costs, while enhancing quality and performance. Navale department of mechanical engineering, jaihind college of engineering, savitribai phule pune university, pune maharashtra india. Hysteretic damping 3 for example, structural or hysteretic damping is a type of dissipation that is a function of friction within a material. Nye lubricants 795a ng synthetic damping grease 50g tube.
Finally, the numerical analysis and experimental results show that the grease with a different level of viscosity affects the vibration signal of the defective bearing. If the system is underdamped, the moving system will oscillate about the final steady position with a decreasing amplitude. The damping torque should have a magnitude that the pointer quickly comes to its final steady position. The viscous damping coefficient is either assigned based on the construction material e. Article pdf available in advances in mechanical engineering. Mechanical damping is, generally defined, as the measure or way a system has to dissipate vibration energy, in the forms of sound and heat by generated friction. Structural vibration analysis and damping engineering books.
Structural vibration analysis and damping book pdf by c. Gavin a rayleigh damping matrix is proportional to the mass and sti. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Where can i get the real sticky damping grease cloudy nights. Damping greases were first formulated to build fine tolerances economically into microscopes, telescopes, and binoculars. Analysis and damping benefits from my earlier book structural vibration analysis. A damping grease is an engineering design tool for free motion control and noise reduction. Objectively, damping greases must retain their damping qualities throughout the temperature range of the application, so careful attention should be paid to the temperature range of each grease. Effects of damping on systems motions steady state.
Gavin fall 2018 1 classical damping the equations of motion of an unforced ndegree of freedom elastic structure with viscous damping are mr. Damping grease an engineering tool for economical noise and motion control. Pg44a can be heated to aid dispensing for volume applications. F, is nsf h1 food grade registered and contains no pfoas perfluorooctanoic acid. A small amount of damping grease on focusing threads delivered smooth, silent operation and a. Engineering noise controls dave yantek mining hearing loss prevention workshop june 2122, 2005 pittsburgh research laboratory. Grease generally consists of a soap emulsified with mineral or vegetable oil. This enhanced successor is far more comprehensive with more analytical discussion, further consideration of damping sources.
An engineering tool for economical noise and motion control. Nov 29, 2016 a video demonstrating how motion can be controlled with the use of a damping grease. Using damping grease as an engineering tool to control noise and motion is not a new concept. Damping is a phenomenon by which mechanical energy is dissipated.
Also a damping grease is an ideal way to improve the tactile feel of customer operated controls, such as switches. This fascicle is the one about synthetic lubricants, collecting products manufactured by. However, the disadvantage of greases with a high base oil viscosity. Perceived quality is everything, and the feel of a part can greatly impact customer satisfaction. Estimation and modeling of damping and engineering. Understanding damping techniques for noise and vibration. The current paper extends this tool concept to include rules for stiffness and damping coefficient estimation. Damping grease allows engineers to adjust the torque to actuate a device to craft the. It is a damping grease applied to the focusing threads of binoc ulars. To introduce basics of automotive engineering to explain main vehicle systems througt examples and real models. Understanding damping techniques for noise and vibration control. Despite being small in magnitude, mechanical damping greatly affects the system respo. Estimation and modeling of damping and engineering auxiliary. Basics of vehicle construction stjepan galambos, assistant.
Though available for more than 60 years, their use didnt extend far beyond optical instruments because of their limited lowtemperature capabilities. For a quantitative measure of damping the halfpower bandwidth method can be employed. Pdf structural vibration analysis and damping by c. The kit features mediumviscosity greases from the fluorocarbon gel 868 and nyogel 774 series of products that were designed to control motion and vibration, maintain accurate positioning, smooth operation, and provide touch feedback for a broad array of mechanisms and controls. Nyecorr 140, a ptfethickened, heavy viscosity completely fluorinated grease. Trim the boom mat material to desired shape and size with your boom mat blade lock knife or scissors. Forced, nonresonant vibration is rarely attenuated by damping, although application. This form of damping is observed to not increase with frequency, so instead of a viscous damping force. A new, expanded damping grease sample kit is now available from nye lubricants, inc. The kit features mediumviscosity greases from the fluorocarbon gel 868 and nyogel 774 series of products that were designed to control motion and vibration, maintain accurate positioning, smooth operation, and provide touch feedback for a broad array of.
Extremely high viscosity fluid and grease damping lubricants. When the moving system moves rapidly but smoothly to its final steady position, the system is said to be critically damped. Special lubricants and noise damping products for the. It serves several purposes, to reduce wear and tear between the sliding contact and the resistive surface and to prevent corrosion. Damping of torsional vibrations and impacts from engine to drivetrain main types. Sinopec 4128 lubricant for mechanical time fuse is blended with synthetic base oil and plural highly re. Ive been trying to find some of that sticky grease that is used on focuser racks and slow motion gears to lubricate and smooth them out.
581 400 246 1075 111 1304 382 317 778 991 983 1168 197 112 265 1446 380 185 1240 928 856 1083 1233 43 505 754 176 1475 500 257 165 686 1038 1259 831 988 827 380 366 243 787 1252 745