The aim of this study was to rigorously test and qua … I will freely admit that I am not at all an expert on swing mechanics, and I am aware that the "perfect" swing for fast-pitch baseball is quite different than it would be for slow-pitch softball. Email: pahademadhu@yahoo.com, vandana_stpl@rediffmail.com . However, looking at this movie (and assuming this player is not exhibiting some horrendously bad habits) it would appear that the bat undergoes three distinct phases of motion, and that the relative importance of the rotation about the body ωbody and the rotation about the wrists ωwrists is different for each of the three phases of the swing. In our case the object which is rotating is a bat, with mass distributed along its entire length. 2. But hitting is one of the hardest feats in modern sports. To give you an idea of some real world examples, consider a golf club and a baseball bat. Each participant was required to complete 10 dry swings (5 warm-up and 5 postwarm-up) at maximum effort within 3 different conditions. It was hypothesised that when compared to a standard bat, only a handle-weighted bat would produce equivalent bat kinematics. The MOI considers where the weight is placed in the bat, not just the amount of weight. He published his theory in the book titled, Theoria Motus Corporum Solidorum Seu Rigidorum or Theory of the Motion of Solid or Rigid Bodies . To understand the importance of the rotational properties of a bat and to help illustrate why the swing weight of the bat might be important, let's take a look at the motion of the bat during a typical swing. In the language of sports equipment I'm talking about swing weight. The 306 swings by 22 male players (age 13-18 y) were analyzed. Baseball and softball bats are sold according to length in inches and weight in ounces.1 Much to the consternation of players buying new bats, however, not all bats that weigh the same swing the same. Effects of moment of inertia on restricted motion1 swing speed 2 Abstract 3 In many sports, the maximum swing speed of a racket, club or bat is a key performance 4 parameter. The Ideal Moment of Inertia for a Baseball or Softball Bat A. Terry Bahill, Fellow, IEEE Abstract—In selecting a baseball or a softball bat, both weight and weight distribution should be considered. It is shown that for a given coefficient of restitution (COR), both the intrinsic power and the swing speed of a tennis racquet or baseball bat correlate strongly with the MOI about an axis through the handle and only weakly with the mass. Knowing the period T, the mass m, the acceleration due to gravity g, and the distance d between the pivot point and the balance point, you can calculate the moment-of-inertia from. The moment of inertia of a bat is dependent on the mass of the bat and how that … The 30-oz Easton Graphite bat swings easily, feeling more like a 26-oz Louisville Slugger Genesis, while the 30-oz Louisville Slugger Warrior feels very heavy when I swing it, feeling more like 34-oz Louisville Slugger Pro II end-loaded or a 38-oz Easton BigMax bottle bat (both from the mid 1980's). Ten experienced baseball players (ages 20-25 years) voluntarily participated in this study. Bat control would improve for a lower MOI bat, and that might allow a player to make solid contact with the ball more frequently. The opposite behavior can be demonstrated with a 27-oz Miken Ultra and a 30-oz Miken Ultra II. There is an inverse relationship between bat linear and angular acceleration and mass and moment of inertia, respectively, for a given linear and angular impulse (integral of force/torque and time). While the balance point (center-of-gravity) of an object is a single fixed location, the rotational inertia (opposition to a change in rotational motion) depends on the location of the pivot point about which the object rotates. ... explaining the mechanics of the golf swing in terms of the club's changing moment of inertia. However, these considerations must be individualized, because there is large variability in how different batters swing a bat and in how each batter swings different bats. I have weighed both on a precision scale and they are within 0.2-oz of each other. Figure 1: Dynamic Moment of Inertia bat. The n value in literature is found to be between 0.25- In order to solve this more difficult problem, we pretend that the bat is made up of very large number of very small slices, each with its own incremental mass, Knowing the location of the balance point is important. Moment of inertia is so important, in fact, that some theories suggest matching sports equipment by its moment of inertia if more than one piece of equipment is used in the same sport. In physics, moment of inertia is a measure of how easy or difficult it is to rotate an object around an axis point. The speed of the bat, just prior to impact with the ball, was measured and the data was normalized for each player. Watch Bonds' Rotational Batting (Hip Shoulder Rotation) - mrcrush8 on Dailymotion The ideal moment of inertia for a baseball or softball bat Abstract: In selecting a baseball or a softball bat, both weight and weight distribution should be considered. The moment-of-inertia is always calculated or measured with respect to a specified pivot point. In this article I'll discuss the rotation of the bat, the rotational inertia of the bat (the distribution of mass compared to the pivot point), and the effect this rotational inertia has on bat swing speed and batted ball velocity. This is sometimes done in golf, for example, where some believe that it helps the golfer to improve their swing if all of their clubs have the same moment of inertia. Moment of inertia 5 You are coaching a Little League baseball team. This cannot be a realistic analysis, then, since the very act of swinging the bat involves a rotational component of motion. The increase in bat-swing speed means a player could wait a split second longer before committing to a swing. Ultimately in our discussion of swing speed and bat properties, the exact location of the pivot point doesn't matter so much as long as we pick one pivot location and use it for all of our comparisons. Where possible, these properties were studied for both aluminum and The DMOI bat is characterized in that the bat could be swung more easily by reducing the moment of inertia at the initial stage of swing without decreasing the bat weight and has a faster swing velocity and lower muscle activity. 3 A Practical Guide to Gait Analysis The purpose of this study was to determine if warm-up with baseball bats of different moments of inertia has an effect on swing pattern and bat velocity. Previous research has defined the ideal bat weight … Abstract— In selecting a baseball or a softball bat, both weight and weight distribution should be considered. 2- Measure Length Between Balance Point and Knob. Inverse dynamics with respect to the batter's hands were computed given the known kinematics and physical properties of the bats. By contrast, peak moments were weakly correlated with bat moments of inertia and bat tip speed. Golf club with a higher swing weight (moment of inertia): A. requires more torque to swing ... B. throwing a baseball C. holding a plank for 1 minute D. stretching a resistive band. This research uses experimental methods to examine five baseball-bat design parameters and their relationship to batted-ball speed. ng velocity, batted-ball speed, hitting distance, muscle power, and grip force. Warm-up with Baseball Bats of Varying Moments of Inertia: Effect on Bat Velocity and Swing Pattern Research Quarterly for Exercise and Sport, Vol. He does a good job of choosing which pitches to swing at, but he keeps missing because his bat doesn't get around fast enough. In many sports, the maximum swing speed of a racket, club, or bat is a key performance parameter. 74, No. The DMOI bat is characterized in that the bat could be swung more easily by reducing the moment of inertia at the initial stage of swing without decreasing the bat weight and has a faster swing velocity and lower muscle activity. 3- (If you have a kitchen scale, find exact weight of bat) 4- Input data points in calculator below ***** Overview. 1, Vandana Jha. Key Words: pattern change Madhubala Pahade 1, Vandana Jha 2. Do you think the moment of inertia of this rod that's the same mass and length that it was, we're just rotating it about the center, do you think this moment of inertia is gonna be bigger than, smaller than or equal to what the moment of inertia was for a rod rotated about the end. Unlike other weights and baseball swing trainers on the market, the Hitting Knob decreases the moment of inertia which increases your bat speed. 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