![]() Let's look at how the platform of a vibration plate moves and influences us in these four phases. The nominal acceleration should also allow us to properly evaluate the influence of acceleration on our body, comparable to the influence of other typical types of acceleration, like acceleration from riding a rocket, an airplane or an elevator.įor a vertical vibration plate, its non-constant vibration acceleration influences us differently in each of 4 phases of a vibration cycle. However, for a vibration plate, we want to use a nominal value to represent the vibration acceleration, so that we can properly reference, evaluate and compare the intensity of different vibration plates. Vibration acceleration is not a constant value. Otherwise, the G-force value result is incorrectly doubled. ![]() Therefore, using this formula, the "amplitude" quoted by manufacturers should be cut by half in order to correctly calculate G-force. The "amplitude" quoted by all vibration plate manufacturers is actually peak-to-peak amplitude, which doubles the amplitude defined in physics. It is important to note that the amplitude in this formula is the amplitude defined in physics. It depicts that the acceleration changes from the max negative positive value to the max positive value. The factor sin(2πft) has its value changing from -1 to 1 on the time line of a vibration cycle. The acceleration formula of simple harmonic vibration model is set as below. With this model, velocity and time are replaced by frequency and amplitude in the calculation. In physics, simple harmonic vibration model is used to analyze and calculate vibration acceleration. The G-force of vibration keeps changing its value between the max positive value and the max negative value in each vibration cycle. In each cycle the velocity changes from zero to maximum, maximum to zero and repeats in reverse direction: v = ωDcos(ωt). The higher the G-force, the higher the influence the vibration plate can put on human body. For example, that a rocket moves up on a 2G acceleration during the launch means its acceleration is 2 times of the acceleration of gravity.įor a vibration plate, G-force is an important indicator of vibration intensity. For a precise definition, G-force is an acceleration ratio that is related to the acceleration of gravity. ![]() G-force is calculated as acceleration in m/s 2 divided by G (9.81 m/s 2). When it is related to acceleration's influence to human body, G-force is usually adopted to express acceleration so that its magnitude can be convenient comprehended, because on earth we experience the acceleration of gravity(G) all day long. G is referred to as the acceleration of gravity, which equals 9.81m/s 2 at the sea level.Īcceleration of an object is defined as the rate of its velocity change (Δv) in a given period of time (Δt).Īcceleration is commonly expressed using the unit m/s 2. G-force is an acceleration expressed using G as the unit. So called G-force, it is actually not a force. FAQ > G-force Vibration G-force Definition and Calculation ![]()
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