Gear Noise and Vibration Episode 1 Part 2 ppt

[...]... Dynamics and noise of parallel axis gearing Inst Mech Eng Conf Gearing in 19 70, Sept, pp 11 1 - 12 1 Furley, A.J.D., Jeffries, J.A and Smith, J.D., 'Drive Trains in Printing Machines', Inst Mech Eng Conference, Vibrations in Rotating Machinery, Cambridge, 19 80, pp .23 9 -24 5 Palmer, D and Munro, R.G., 'Measurements of transmission error, vibration and noise in spur gears.' British Gear Association Congress, 19 95,... Mech Eng., Vol 17 2, 19 58, pp 87 -11 2 Gregory, R.W., Harris, S.L and Munro, R.G., 'Dynamic behaviour of spur gears.' Proc Inst Mech Eng., Vol 17 8, 19 63-64, Part I, pp 20 7 -22 6 Munro, R.G., 'The Effect of Geometrical Errors on the Transmission of Motion Between Gears.' I Mech E Conf Gearing in 19 70, Sept 19 70, p 79 Cremer, L., Heckl, M., and Ungar, E.E., Structure-borne sound Springer-Verlag, 19 73, Berlin... normal teeth is 1. 4 x 10 N/m/m or 2 x 10 IbFin/in, a Figure used by Gregory, Harris and Munro [1] in the late 19 50s but one which has stood the test of time As a rough rule of thumb we can load gears to 10 0N per mm of face width per mm module so a 4 mm module gear 25 mm wide might be loaded to 10 ,OOON (1 ton) This load infers a deflection of the order of 400 /1. 4 x 10 7 m or 28 .6 pm (1. 1 mil) Experimental... range of equipment and analysis techniques Academic equipment based on off-line analysis is often, however, not suited to high speeds or mass production References 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Lemanski, A J., Gear Design, S.A.E., Warrendale 19 90 Ch 3 Buckingham, Earle, Analytical mechanics of spur gears, Dover, New York 19 88 Harris, S.L., 'Dynamic loads on the teeth of spur gears.' Proc Inst... take sets of gears for test to the nearest set of equipment Unfortunately, those few firms who have T.E equipment usually use it very heavily so it may be better to ask a university if equipment can be hired Newcastle [10 ], Huddersfield [11 ], and Cambridge [ 12 ] in the U.K., Causes of Noise 11 Ohio State University [13 ] and other researchers [14 , 15 , 16 ] have developed their own T.E equipment and are usually... accurate Fig 2. 4 Unwrapping string model Chapter 2 18 Specifying actual radius is of little help in locating the correct points and referencing them to gear rotation What is done in practice is to work in terms of roll distance See Fig 2. 4 As the gear rotates and the "unwrapping string" leaves one gear base circle and transfers to the other there is a linear relationship between rotation and the distance... statically and dynamically even with spur gears so that we are mainly dependent on finite element stressing software packages to give an answer There is a significant effect at the ends of gears since the ability to expand axially reduces the effective Young's modulus and high angle helical gears have reduced contact support at one end and additional buttressing at the other end 13 14 Chapter 2 base pilph... of Mechanical Eng., Queensgate, Huddersfield, HD1 3DH, U.K Prof R.G Munro University Eng Dept., Trumpington St., Cambridge CB2 1PZ, U.K Dr J.Derek Smith Ohio State Univ., Mech Eng Dept., 20 6 West 18 th Ave., Columbus, Ohio, 43 21 0 -11 07 Prof D R Houser INS A de Lyon, Villeurbane, Cedex, France Mr D Remond University of New South Wales, Australia Mr R.B Randall Tech Univ of Ostrava, CZ - 703 88 Ostrava,... Fig 2. 2 Picture of tip relief showing deviation from an involute in (a) and typical tooth shape (b) Chapter 2 16 The amount of "tip relief needed in the example above can be estimated by adding the worst case elastic deflection, for example, 28 .6um + 70% (to allow for misalignment), to the possible base (adjacent) pitch errors of 3 um on each gear and to the possible profile errors of 3 um on each gear. .. to 10 0% overload and deflection at either end of the tooth, or in the middle if crowned, so deflections can be large Using the rule of thumb that conventional surface-hardened teeth may be loaded to 10 0 N/mm facewidth/mm module, the above 4mm module gear (6 DP) loaded to 400 N/mm would deflect 400 /14 , i.e., 28 urn, nominally but, allowing for load concentrations, this could rise to 50 um (2 mil) 2. 2 . can be hired. Newcastle [10 ], Huddersfield [11 ], and Cambridge [ 12 ] in the U.K., Causes of Noise 11 Ohio State University [13 ] and other researchers [14 , 15 , 16 ] have developed their . class="bi x0 y0 w1 h1" alt="" Causes of Noise 1. 1 Possible causes of gear noise To generate noise from gears the primary cause must be a force variation which generates a vibration . Dynamics and noise of parallel axis gearing. Inst. Mech. Eng. Conf. Gearing in 19 70, Sept, pp 11 1 - 12 1. 8. Furley, A.J.D., Jeffries, J.A. and Smith, J.D., 'Drive Trains