Disclosed are display module evaluation jigs and methods, The display module evaluation jig includes: a first body defining a plurality of first recessions on a top surface of the first body; a second body disposed on and combined with the first body; and a plurality of insertions on the first recessions and between the first body and the second body. Inner lateral surfaces of the first body are directed toward and spaced apart from lateral surfaces of the insertions. The inner lateral surfaces define the first recessions.

A stiffness characteristic measurement device holds a golf club head with a face surface facing upward, drops a collision rod vertically toward the face surface, and calculates the stiffness characteristic of the golf club head based on a detection value of an accelerometer attached to the collision rod. Every time the measurement point on the face surface is changed, a drop distance changing step of adjusting the drop distance of the collision rod is performed so that the collision velocity of the collision rod to the measurement point is substantially constant.

A stiffness characteristic measurement device holds a golf club head with a face surface facing upward, drops a collision rod vertically toward the face surface, and calculates the stiffness characteristic of the golf club head based on a detection value of an accelerometer attached to the collision rod. Every time the measurement point on the face surface is changed, a drop distance changing step of adjusting the drop distance of the collision rod is performed so that the collision velocity of the collision rod to the measurement point is substantially constant.

A falling-object protective structures (FOPS) test assembly for carrying a FOPS test of a wall of cab of a heavy vehicle is configured to releasably carry a test ball for the FOPS test above a predefined distance above wall. The FOPS test assembly defines a closed path for test ball from its housing position to wall, and includes a handling means configured to assume a first condition in which they do not interfere with the passage of test ball through the closed path when ball passes through closed path in a first direction and a second condition in which handling means lock and hold test ball within the closed path once test ball passes again through the closed path in a second direction opposite to the first direction.

A falling-object protective structures (FOPS) test assembly for carrying a FOPS test of a wall of cab of a heavy vehicle is configured to releasably carry a test ball for the FOPS test above a predefined distance above wall. The FOPS test assembly defines a closed path for test ball from its housing position to wall, and includes a handling means configured to assume a first condition in which they do not interfere with the passage of test ball through the closed path when ball passes through closed path in a first direction and a second condition in which handling means lock and hold test ball within the closed path once test ball passes again through the closed path in a second direction opposite to the first direction.

A shock testing machine including: a test platform for holding an item to be shock tested; a carriage for carrying the test platform and being movable relative to the test platform in a testing direction, the testing direction being a direction of movement of the carriage; one or more rails movably supporting one of the test platform and the carriage; a stop configured to stop the carriage from moving in the testing direction at a predetermined location while allowing the test platform to continue moving in the testing direction past the predetermined location; and a brake configured to decelerate the test platform after the carriage has been stopped by the stop.

A vehicle windshield testing assembly includes a test table, a plurality of supports, a vehicle windshield, and a testing fixture. The test table is configured to be adjustable about a first axis and a second axis. The plurality of supports is movably connected to the test table. The vehicle windshield is supported by the plurality of supports. The testing fixture supported by the plurality of supports. The testing fixture includes a plurality of hollow sleeves configured to receive a testing object. Each of the hollow sleeves has an opening facing the vehicle windshield.

A vehicle windshield testing assembly includes a test table, a plurality of supports, a vehicle windshield, and a testing fixture. The test table is configured to be adjustable about a first axis and a second axis. The plurality of supports is movably connected to the test table. The vehicle windshield is supported by the plurality of supports. The testing fixture supported by the plurality of supports. The testing fixture includes a plurality of hollow sleeves configured to receive a testing object. Each of the hollow sleeves has an opening facing the vehicle windshield.

One example is a shock gauge system for measuring an external blast to a hull. The shock gauge system includes at least one accelerometer to produce acceleration data in response to the external blast, a mass with an accelerometer affixed to it, a crush block, a linear displacement potentiometer (LDP), a camera, and a processor logic. The LDP device generates displacement data of a mass being pushed into the crush block when reacting to the external blast. The camera captures images of movement of the mass. The processor logic verifies if the acceleration data is valid by correlating the acceleration data to the displacement data, the images, and/or an amount of displacement into the crush block by the mass. When the acceleration data is valid, the acceleration data may be used to create a more blast resistant hull.

One example is a shock gauge system for measuring an external blast to a hull. The shock gauge system includes at least one accelerometer to produce acceleration data in response to the external blast, a mass with an accelerometer affixed to it, a crush block, a linear displacement potentiometer (LDP), a camera, and a processor logic. The LDP device generates displacement data of a mass being pushed into the crush block when reacting to the external blast. The camera captures images of movement of the mass. The processor logic verifies if the acceleration data is valid by correlating the acceleration data to the displacement data, the images, and/or an amount of displacement into the crush block by the mass. When the acceleration data is valid, the acceleration data may be used to create a more blast resistant hull.