![tennis racquet frame vibration tennis racquet frame vibration](https://cdn-magento2-media.head.com/wysiwyg/Prestige-Racquet_2016_1.jpg)
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These do not reduce the frame shock or vibrations. There are a variety of "vibration damping or dampening" systems that are placed on the string bed. Additionally there has been no research demonstrating that string vibration effects power or control. To date there is no clinical research which has demonstrated that the vibrations produced by the strings cause hand, wrist, arm or elbow injury. The racquet vibrates in the range of 100-200 Hz (vibrations or cycles/second) and the strings at 500-600 Hz. The transducer picks up the physical response and the oscilloscope displays this input as an electrical signal.Īs was pointed out in Part 1 both the racquet frame and the strings of the racquet vibrate. While commonly used in the physics laboratory, oscilloscopes are used extensively in troubleshooting in the electronics as well as the automotive industries (for example, to measure engine vibrations). Specific transducers create an electrical signal in response to other physical input - sound, mechanical stress, heat, light, or pressure.
![tennis racquet frame vibration tennis racquet frame vibration](https://illumin.usc.edu/assets/media/132/i8_152_Tennis_fig01-334x450.jpg)
Typically, a transducer is used with the oscilloscope.
![tennis racquet frame vibration tennis racquet frame vibration](https://cdn-magento2-media.head.com/wysiwyg/2019_G360_Radical.jpg)
While the sweet spot locations vary based on racquet length, weight, head size, balance and string tension, typically the sweet spots are relatively located as depicted in Figure 1. The third sweet spot is the maximum coefficient of restitution (COR) where the ball rebounds with maximum power (and speed). If a ball strikes the node of the first harmonic, minimum vibration is felt by the hand and arm. If the ball strikes the racquet's center of percussion that initial shock to the hand is minimized. When the ball hits the racquet both a sudden jarring shock and rapid fluctuating vibrations result. These two sweet spots deal specifically with the subject of the column. It discussed the center of percussion and the node of the first harmonic. Sweet Spots: Part 1's column noted that there are three sweet spots on a racquet. Let me go back and resolve those questions first. There were some questions on the Racquet Stiffness, Vibration and Dampening - Part 1 column regarding the "third" sweet spot, what an oscilloscope measures and interpretation of the oscilloscope patterns.
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Racquet Stiffness, Vibration and Dampening - Part 2
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