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Acceleration iunit3/21/2023 ![]() The signal is passed to a phase-conscious rectifier and the output from this is connected to the operating armature coil of a differential electromechanical relay (see inset). 7.8-the operating circuit(s) of the other fin(s), being, of course, identical. The operating circuit of one fin is shown in Fig. ![]() ![]() The output transformer is connected to the operating circuit of the fin. The output from the summation circuit is applied to an amplifier which energizes the output transformer of the control equipment. ![]() The potentiometers are connected in series to create a summation circuit where the various signals are added (or subtracted) according to the sign of the function each represents. 6.19) and the helm transmitter (if fitted) are connected to the tappings of a potentiometer. It is normal that small movements of helm of up to say 5° either side do not affect the control but when helm is increased beyond this point, linear signals are derived which may provide maximum stabilizing power for full helm.Įach linvar and also the output from the acceleration amplifier ( Fig. The transmitter CX 2 is operated by the helm. The acceleration unit is a servo unit and derives its signals by differentiating the movements of the roll velocity gyroscope. The precession of the roll and the velocity gyro are converted into electrical signals via linvars. The three main sensors detect roll angle, roll velocity and roll acceleration. Obtaining information about the product vibration sensitivity This level, in acceleration units, g, is the ‘product shock fragility’ (see SHOCK). Typically, one determines the ability of the product to sustain impacts without damage. Obtaining information about the product shock fragility This is important because any inaccurate information used about the product will produce a nonoptimal design, which will result either in product damage or overpackaging (often never detected). However, due to the complexity of most products, it is best to perform product-testing in order to obtain the most accurate data possible. In many cases, due to the lack of prototypes for testing, the information may be estimated, based on the properties of the components of the product. Products are tested, without any packaging, to determine their inherent ability to sustain shock, vibration and compression forces. Marcondes, in Encyclopedia of Vibration, 2001 Obtaining Information about the Product Įxpressed in Hz/ms, the acceleration and deceleration parameters represent the rate of velocity change.Įxpressed in ms, they represent the time to go from 0 to Maximum velocity.J. When the jerk ratio parameter is set to 0, the acceleration / deceleration ramp has a trapezoidal profile. These velocity changes are implicitly managed by the PTO function in accordance with Acceleration, Deceleration and JerkRatio parameters following a trapezoidal or an S-curve profile.Īcceleration / Deceleration Ramp with a Trapezoidal Profile Deceleration is the rate of velocity change, starting from target velocity to Stop Velocity. In this case, the motion stops at a velocity = deceleration rate x 1 ms.Īcceleration is the rate of velocity change, starting from Start Velocity to target velocity. Value 0 means that the Stop Velocity parameter is not used. Stop Velocity is only used when moving from a higher velocity than Stop Velocity, down to velocity 0. The Stop Velocity is the maximum frequency at which a stepper motor stops producing movement, with a load applied, without loss of steps. ![]() In this case, the motion starts at a velocity = acceleration rate x 1 ms. Value 0 means that the Start Velocity parameter is not used. Start Velocity parameter is used when starting a motion from velocity 0. The Start Velocity is the minimum frequency at which a stepper motor can produce movement, with a load applied, without the loss of steps. ![]()
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