How to select testing equipment according to GJB150A standard-Loose Cargo Transportation Test-CME Technology Co., Ltd.

DATE: 2025-04-10 VIEW COUNT: 304

MIL-STD-810H and GJB150A are standards for testing the environmental adaptability and durability of equipment. MIL-STD-810H is a U.S. military standard primarily used to test the reliability and adaptability of equipment under various extreme environmental conditions, such as high and low temperatures, humidity, vibration, and shock. It is widely used for various U.S. military equipment, including communication devices, vehicles, and weapons.

GJB150A is China’s military equipment environmental testing standard, which is similar to MIL-STD-810H and is used for testing the environmental adaptability of military equipment. It covers test items such as temperature and humidity, vibration, sand and dust, and corrosion, ensuring that equipment can function properly in complex environments.

Loose cargo transportation tests are primarily encompassed within the standards MIL-STD-810H Method 514.8 and GJB150A.16A.

Test Purpose

Develop materiel to function in and withstand the vibration exposures of a life cycle including synergistic effects of other environmental factors, materiel duty cycle, and maintenance.

Verify that materiel will function in and withstand the vibration exposures of a life cycle.

Test Method

The most realistic alternative for truck, trailer, or other ground transportation is to use Procedure II that requires the transportation vehicle and a full cargo load. In this test, the cargo has freedom to bounce, scuff and collide with other cargo and with the sides of the vehicle. The loose cargo environment includes conditions experienced by cargo transported in a vehicle traversing irregular surfaces. This test replicates the repetitive impact environment incurred by cargo transported under these conditions.

Simulation of this environment requires use of a package tester (Figure 1) that imparts a 25.4 mm (1.0inch) peak-to-peak, circular synchronous motion to the table at a frequency of 5 Hz. This motion takes place in a vertical plane. The figure shows the required fixturing. This fixturing does not secure the test item(s) to the bed of the package tester. Ensure the package tester is large enough for the specific test item(s) (dimensions and weight).

Figure1: Loose cargo test setup

a) Test bed: Cover the test bed of the package tester with a cold rolled steel plate, 5 to 10 mm (0.2 to 0.4 in) thick, and secure the plate with bolts. The tops of the heads should be slightly below the surface. Space the bolts at sufficient intervals around the four edges and through the center area to prevent diaphragming of the steel plate. Do not start a test on an area of steel plate that is severely damaged or worn through.

b) Fencing: The fence opposite the vertical impact wall is not intended as an impact surface, but is used to restrain the test item from leaving the tester. The distance to this restraining fence should be sufficient to prevent constant impact, but still prevent one or more of multiple test items from “walking” away from the others. The height of the test enclosure (sideboards, impact wall, and restraining fence) should be at least 5 cm higher than the height of the test item to prevent unrealistic impacting of the test item on the top of the enclosure.

Recommended Equipment

KRD51 Transportation Bounce Test System

Bounce testing simulates the constant loose cargo state during truck transport. Often times, containers carrying military and civilian hardware (such as: medical supplies, electronics, weaponry, communication devices) travel for extended periods of time and must be transported off-road. All of these items must maintain functionality upon arrival at their destinations.

KRD51 Transportation Bounce Test System is mainly composed of working table, enclosures, two pairs of eccentric mechanisms, transmission devices and mounting seats.

a) Working table: the working table is made of steel frame and solid wood board, and then laminated or steel plate is laid as required.

b) Enclosure: the enclosure consists of a steel frame and solid wood strips. It is used to limit the horizontal movement of the sample and accept the impact of the sample due to bounce.。

c) Eccentric mechanisms: the movement of the eccentric mechanism causes vertical and horizontal displacement of the worktable. The worktable is supported by an eccentric shaft and bearing support with a fixed eccentricity of 12.7mm, one end is fixedly connected with the bearing support, and the other end is hinged with the bearing support.。

d) Control system: can arbitrarily set the test time and automatically shut down after the test.

e) Foundation: Special foundation or embedded chemical anchor bolts or expansion bolts on the leveled concrete floor.

Specifications

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