Crystal Instruments recently updated the Vibration Utilities app (available for iOS and Android). This app supports features assisting in calculations related to the shock and vibration testing industry.

Random control is a fundamental vibration test for various industries and manufacturers of products. The FFT based control algorithm transforms time signals to the frequency domain where analysis, calculation, comparison…average, (etc.) are done. The performance of Random control is determined by how well the FFT describes the system characteristics. Proper spectrum resolution must be chosen in order to avoid missing any desirable observations and to meet the requirement of the control performance.

To simulate equipment in a structure subject to earthquakes, vibration tests for seismic qualification utilizes different types of motion to effectively simulate the postulated seismic environment. Single frequency and multiple frequency are the two categories of motion that these types of motion fall into. Each category includes multiple waveform types for different cases.

A battery pack has an enclosure to protect battery cells from external hazards, such as external forces and moisture. An internal cooling system and Battery Management System (BMS) provides a protected environment for the cells to perform in.

While performing vibration or THV (temperature/humidity/vibration) tests on a battery pack, accelerometers, temperature, and humidity sensors can measure the external environment of the battery pack. The BMS monitors the status of internal battery pack and communicates with external components via CAN bus.