A vibration test jig may include an upper jig frame to which a vibration test object is fixed and a lower base frame mounted to an oscillator, and a plurality of double parallelograms connected between the jig frame and the base frame, for generating displacements in an upward/downward direction and/or a forward/rearward direction. Each of the double parallelograms may include a complex four-articulation link structure and a wire rope isolator. The vibration test jig can simulate a deformation mode due to generation of resonances.

A system comprises a computer including a processor and a memory. The memory includes instructions such that the processor is programmed to receive sensor data including wheel speed measurements, suspension displacement measurements, and tire leak detection data from a vehicle, estimate a rough road measurement based on a deviation of a wheel speed with respect to an average wheel speed and or based on suspension displacement sensor signals and generate temporal spatial map data indicative of a location and a roughness severity metric of a roadway portion based on the rough road measurement and tire leak detection data.

Various machines, systems, and methods for generating calibration data for a sensorized brake pad are disclosed. In some embodiments, a system includes a fixture, a brake pad retainer, a pressure plate, an actuator and a controller. The actuator applies a pressure to the sensorized brake pad and signals from the pressure sensors are received. Calibration data is generated based on the signals received from the pressures sensors when the pressure is applied to the sensorized brake pad.

Various machines, systems, and methods for generating calibration data for a sensorized brake pad are disclosed. In some embodiments, a system includes a fixture, a brake pad retainer, a pressure plate, an actuator and a controller. The actuator applies a pressure to the sensorized brake pad and signals from the pressure sensors are received. Calibration data is generated based on the signals received from the pressures sensors when the pressure is applied to the sensorized brake pad.

Methods to use a tool for dimensional verification of a vehicle frame suspension system bracket pocket having first and second cam slots, the tool including a first sub-assembly configured for insertion through and registration of the first cam slot; a second sub-assembly configured for insertion through and registration of the second cam slot; and an intermediate sub-assembly disposed between and attachable to the first and second sub-assemblies via a shaft, the intermediate sub-assembly including an extension rod receiving feature defining at least one extension rod receiving aperture; wherein the sub-assemblies lock against the bracket walls to define a horizontal center axis and are adjustable to determine and register a center point along an intersecting vertical center axis between the first and second cam slots that is alignable with the at least one extension rod receiving aperture.

Methods to use a tool for dimensional verification of a vehicle frame suspension system bracket pocket having first and second cam slots, the tool including a first sub-assembly configured for insertion through and registration of the first cam slot; a second sub-assembly configured for insertion through and registration of the second cam slot; and an intermediate sub-assembly disposed between and attachable to the first and second sub-assemblies via a shaft, the intermediate sub-assembly including an extension rod receiving feature defining at least one extension rod receiving aperture; wherein the sub-assemblies lock against the bracket walls to define a horizontal center axis and are adjustable to determine and register a center point along an intersecting vertical center axis between the first and second cam slots that is alignable with the at least one extension rod receiving aperture.

A method and apparatus for servicing a shock absorber on a landing gear assembly of an aircraft in a weight-on-wheels state is disclosed. The shock absorber includes at least one chamber containing both hydraulic fluid and a gas in fluid communication with each other. The apparatus includes a source of gas and a source of hydraulic fluid. The amount of hydraulic fluid in the chamber is corrected, preferably such that the chamber is then filled with a known amount of degassed hydraulic fluid. The process may be at least semi-automatically performed, for example under the control of a control unit. By delivering a pre-set mass of gas into the chamber, there is no need to rely on a measure of gas pressure or H-dimension (h) when servicing the shock absorber, and more accurate servicing of a shock absorber may thus be provided.

A method and portable apparatus for servicing a shock absorber on a landing gear assembly of an aircraft in a weight-on-wheels state is disclosed. The shock absorber includes at least one chamber containing both hydraulic fluid and a gas in fluid communication with each other. The apparatus includes a source of gas and a source of hydraulic fluid. The amount of hydraulic fluid in the chamber is corrected, preferably such that the chamber is then filled with a known amount of degassed hydraulic fluid. A pre-set mass of gas is then delivered into the chamber under the control of a gas delivery system of the portable apparatus. More accurate servicing of a shock absorber may thus be provided since account is additionally taken of gas dissolved in hydraulic fluid. By delivering a pre-set mass of gas into the chamber, there is no need to rely on a measure of gas pressure or H-dimension (h) when servicing the shock absorber.

A vehicle measurement station utilizing at least one displacement sensor disposed on each opposite side of a sensor region of a vehicle inspection lane to acquire displacement measurement data, associated with a moving vehicle passing through the sensor region. Each displacement sensor is configured to acquire measurement data along at least three discrete and vertically spaced measurement axes. A processing system receives the acquired data for evaluation, identification of outlier data points, and for determining a measurement associated with a characteristic of the moving vehicle, such as vehicle velocity, axle alignment, wheel alignment, or dimensions.

A vehicle measurement station utilizing at least one displacement sensor disposed on each opposite side of a sensor region of a vehicle inspection lane to acquire displacement measurement data, associated with a moving vehicle passing through the sensor region. Each displacement sensor is configured to acquire measurement data along at least three discrete and vertically spaced measurement axes. A processing system receives the acquired data for evaluation, identification of outlier data points, and for determining a measurement associated with a characteristic of the moving vehicle, such as vehicle velocity, axle alignment, wheel alignment, or dimensions.