Book ChapterDOI
Bending Modes, Damping, and the Sensation of Sting in Baseball Bats
Daniel A. Russell
- pp 11-16
TLDR
In this article, a dynamic absorber in the knob is shown to effectively reduce the vibration of the second bending mode and minimize the painful sensation of sting in the top hand of a player holding a baseball or Softball bat.Abstract:
The painful sensation of sting in the top hand of a player holding a baseball or Softball bat may be a deterrent to enjoying the game, especially for young players. Several mechanisms for reducing the vibration of bending modes have been implemented in youth baseball bats in order to reduce sting. One method of assessing the effectiveness of these mechanisms is to compare the damping rate they provide for the first two or three bending modes in a bat. Damping rates are compared for several wood, aluminum, composite, and two-piece construction baseball bats, in addition to several bats with special damping control mechanisms. Experimental evidence suggests that damping mechanisms which reduce the vibration of the second bending mode arc preferred by players. A novel dynamic absorber in the knob is shown to effectively reduce the vibration of the second bending mode and minimize the painful sting felt in the top hand.read more
Citations
More filters
Journal ArticleDOI
Mechanical Properties and Dynamic Mechanical Analysis of Thermoplastic-Natural Fiber/Glass Reinforced Composites
Luca Di Landro,William Lorenzi +1 more
TL;DR: In this paper, the mechanical properties and dynamic behavior of thermoplastic composites based on polypropylene/glass fibers and natural fibers (i.e., kenaf, hemp, flax) are presented.
Journal ArticleDOI
Road bike comfort: on the measurement of vibrations induced to cyclist
TL;DR: In this article, the authors investigated the effect of a selected set of test conditions on the measurement of vibration induced to the cyclist by a road bicycle and found that all the test conditions had a significant effect on the level of vibrations induced by the bicycle.
Dissertation
Meta aircraft flight dynamics and controls
TL;DR: A meta aircraft is an aircraft composed of smaller individual aircraft connected together through a similar connection mechanism that can potentially transfer power, loads, or information as discussed by the authors, which is one area of research that can increase range and endurance by taking advantage of an increase in L/D.
Journal ArticleDOI
Optimal design of a parallel beam system with elastic supports to minimize flexural response to harmonic loading using a combined optimization algorithm
Bret R. Hauser,B. P. Wang +1 more
TL;DR: In this article, the authors proposed a combined approach where the high modality, EBBF's domain is first surveyed for potential areas of optimal response using a method of Steepest Feasible Descent (SFD), followed by a local search in the optimal region using a more efficient direct search method.
Optimal design of a parallel beam system with elastic supports to minimize flexural response to harmonic loading
TL;DR: The presented method proposes a combined approach where the high modality, EBBF’s domain is first surveyed for potential areas of optimal response using a method of Steepest Feasible Descent (SFD), followed by a local search in the optimal region using a more efficient direct search method.
References
More filters
Journal ArticleDOI
Dynamics of the baseball-bat collision
Abstract: A model is developed for the collision between the baseball and bat, taking into account the transverse bending vibrations of the bat. By coupling the flexible bat to the ball via a parametrized force that each mutually exerts on the other, a complete description of the collision process is obtained, including the exit speed of the ball vf. It is shown that vibrations play an important role in determining vf. The model is in excellent agreement with experimental data at low impact velocities. At the higher velocities more appropriate to the game of baseball, vf is shown to coincide with the rigid-body value only over a very small region in the barrel of the bat and to drop off sharply for impacts removed from that region. Some interesting insights into the collision process are obtained, including the observation that for impacts in the barrel of the bat, the momentum transferred to the ball is essentially complete by the time the elastic wave first arrives at the handle and that any clamping action of th...
Journal ArticleDOI
The sweet spot of a baseball bat
TL;DR: In this paper, the authors measured the impact forces transmitted to the hands of a baseball bat and found that both the vibration node and the center of percussion contribute to the formation of a sweet spot zone where the impact force on the hands is minimized.
Journal ArticleDOI
The sweet spot of a baseball bat
TL;DR: In this paper, the physics of the three sweet spots of a baseball bat are discussed and the location of the ball impact point on the bat that leads to maximum "power" (greatest batted ball speed) is determined.
How to Determine the Modal Parameters of Simple Structures
Svend Gade,Henrik Herlufsen +1 more
TL;DR: In this article, the modal parameters of simple structures can be easily established by the use of PULSETM, the Multianalyzer System Type 3560, and the mode shapes by examining the value of the imaginary part of the frequency response function.
Journal ArticleDOI
Baseball Bat Inertial and Vibrational Characteristics and Discomfort Following Ball–Bat Impacts
Larry Noble,H. Walker +1 more
TL;DR: In this paper, the authors examined the relationship between selected mechanical characteristics of aluminum baseball bats and sensations on the hands resulting from impacts and found that perceived annoyance and discomfort were related to the level of excitation of the fundamental mode and first overtone mode.