Examples Of Harmonic Motion

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• The Principles of Harmonic Drive TM Gearing
  | Reference | Support | Disclaimer ]. (C) 2011 Harmonic Drive LLC | 800-921-3332. The World's Largest Manufacturer of Precision Strain Wave Gearing and Motion Control Products. Long Island Web Design...
• A closer look at motion analysis
  of vibration. DYNAMIC TIME ANALYSIS calculates vibrations caused by loads with explicitly known time histories. DYNAMIC FREQUENCY ANALYSIS most often denotes an analysis of steady-state vibration due to harmonic excitation....
• Choosing the Best Lead Screw for a Linear Motion Application
  develop due to the shaft’s natural harmonic frequency. This is also commonly called “screw whip” and depends on the diameter and length of the screw between supports. It is important to note that a screw’s critical velocity is not a function of orientation (horizontal, vertical, etc). Designers can...
• A Critical Look at Acme, Ball, and Roller Screws for Linear Motion
  vibrations develop due to the shaft’s natural harmonic frequency. This is also commonly referred to as “screw whip” and depends on the diameter and length of screw between supports. Duty cycle: A percentage rating for an application that compares the amount of running time to rest time...
• Vibration Isolators: Design Problem Examples (.pdf)
  EXPANSIONS FOR VIBRATORY PROCESSES IN FIGURE 38 (angles in radians). Wave Shape Function. Harmonic Amplitude as Fractions of 2h ( = fundamental frequency). Frequency of. 2. 3. 4. 5. 6. Harmonics. 2. ___. 2. 2. Square wave. ___. ___. 0. 0. 0. 3. 5. 1. 1. ___. 1. 1. ___. 1. 1. Saw tooth. ___. ___. ___. ___. 2...
• Smooth rotation
  An adaptive algorithm kills jerky motions in motors. Cogging action boosts position errors in motion-control systems as shown by the position-error graph on the top. The harmonic graph on the bottom identifies specific bands of harmonic frequencies generated by motor cogging. The test system used...
• Piezoelectric Sensor Technology
  be easily correlated when the vibration being measured is a simple sinusoidal motion containing one frequency. However, the vibratory motions measured in practice almost always contain some harmonic distortion even with sinusoidal laboratory shakers. Thus, if acceleration data is needed, a transducer...
• Sometimes it pays to be eccentric
  to hold a load, however, a brake must be specified. Although all three types of reducers offer high reductions, small packages, and high accuracy compared to traditional gear reducers, each has something special to offer. Harmonic-drive gears, for example, provide high reduction ratios in a single stage...
• Expanded PTFE Polymer Keeps Electrical and Electronics Cables Clean and Flexible
  , and harmonic-drive grease. Cables such as these have a base longitudinal strength of 24.6 MPa. Hydraulic fluid drops longitudinal strength by 28%, and all other fluids have a 10% or smaller effect on strength. Thermal aging for 120 hr at 121°C cuts cable strength by 10% to 22.1 MPa. The ePTFE jacket material...
• Constant velocity in positioning systems
  and a theoretical, desired value at a particular sampling rate as quantified by a power spectrum. Not specifying a sampling rate implies constantvelocity operation at all frequencies, which may not be possible because of the presence of high-frequency disturbance forces. High-harmonic vibrations...

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