Patent application number | Description | Published |
20090262460 | HEAD ASSEMBLY HAVING A SENSING ELEMENT - A head or slider having a sensor element to detect changes in head-media spacing is disclosed. In illustrated embodiments the sensor element includes a piezoelectric sensor layer or similar layer that provides acoustic emission or vibration responsive to changes in head-media spacing. In illustrated embodiments, the sensor element is located proximate to the close point of the head and slider. In embodiments described in the specification, output from the sensor element is utilized to energize a heating element or microactuator to control pole tip protrusion or actuation of transducer elements responsive to changes in head-media spacing. | 10-22-2009 |
20090326837 | System and Method for Multi-axis Simulation - A multi-axis fatigue testing device includes a multiple input, multiple output mechanical linkage driven by a plurality of actuators and a controller operating each of the plurality of actuators in real time and in synchronization to produce user-defined multiple fatigue cycle profiles. A startup method enables a sample mounted at an arbitrary multi-axis state to receive a desired simulation profile while maintaining the sample below any of the extremum values of the desired simulation profile. | 12-31-2009 |
20090326889 | High Frequency Multi-axis Simulation System - A multi-axis fatigue testing device includes a multi-axis test fixture having a multiple input, multiple output mechanical linkage driven by a plurality of actuators and a controller operating each of the plurality of actuators in real time and in synchronization to produce user-defined multiple fatigue cycle profiles. At least one of the actuators driving the mechanical linkage acts against an artificial load characterized by a stiffness. The stiffness is selected to increase a resonance frequency of the test fixture to allow fatigue testing at higher frequencies for a wider range of samples. | 12-31-2009 |
20100280787 | FEEDBACK CONTROLLER PARAMETER GENERATION WITH STABILITY MONITORING - Stability of a control system for a materials testing system using specified filter parameters is confirmed by inputting to the control system a test signal having a predetermined waveform, automatically monitoring the output of the materials testing system, and automatically comparing the output to a threshold. If the output exceeds the threshold, a first action is taken. If the output does not exceed the threshold, input of a command signal to the control system is permitted. | 11-04-2010 |
20130063834 | Head Assembly with Head-Media Spacing Control - A head assembly including one or more transducer elements for controlling head-media spacing is disclosed. The assembly includes detection circuitry configured to receive an input detection signal responsive to the spacing between the head and the data storage media and provide an output measure indicative of the head-media spacing. The output signal is utilized by control circuitry to provide a control input to one of a plurality of transducer elements on the head to protrude a localized portion of the head to adjust head-media spacing. | 03-14-2013 |
20140324390 | Apparatus and Method for Applying a Load to a Material - A method of controlling a system using a hybrid feedback signal includes providing an input signal with a predetermined waveform to the system and measuring an output of the system with a sensor. An output signal of the sensor is used in a first frequency band as a first portion of a feedback signal. A simulated signal is created in a second frequency band that has one or more of substantially reduced (i) resonances, (ii) phase delay and (iii) noise when compared to the output signal of the sensor in the second frequency band. The simulated signal is used in the second frequency band as a second portion of the feedback signal. | 10-30-2014 |
20140345358 | ACCELERATION COMPENSATION OF LOAD SENSORS - In a mechanical test system, a method of compensating for acceleration induced load error in a load sensor in a mechanical communication with a component comprises measuring an acceleration of the component to obtain an acceleration measurement. A load sensor measures a force applied by the mechanical test system to a test sample in substantially a same direction of the acceleration to obtain a force measurement. The force measurement is modified with a transfer function that includes at least one of a gain correction and a phase correction to compensate for an error value in the force measurement attributed to movement of at least the load sensor when the force is applied to the test sample. | 11-27-2014 |