Torsion Effect and Suppression Scheme of a Translation–Tilt Compensation Pendulum for Accelerometer Performance Investigation

Seismic noise is a major limitation for high‐precision electrostatic accelerometer performance investigation on the ground. Various pendulums were developed to isolate the seismic noise, and the translation–tilt compensation pendulum is a new low‐frequency passive horizontal vibration isolation pendulum. But the test level of the accelerometers mounted on the pendulum bench is influenced by the cross‐coupling from the rotational axis of the bench. In this study, we discuss the influence of the torsional behavior of the translation–tilt compensation pendulum in depth and propose a suppression scheme based on a novel “four‐wire” suspension structure. An experimental platform was developed to validate the theoretical analysis and examine the vibration isolation performance. The results show that the acceleration noise of the pendulum with “four‐wire” suspension structure reached 2 × 10 −9 m/s 2 /Hz 1/2 around 0.1 Hz which is usually the working frequency band of the accelerometer. This result is two orders of magnitude lower than the previous noise level. The seismic noise suppression of the translation–tilt compensation pendulum is improved, and the frequency band of vibration isolation is expanded. The pendulum can be applied in more precise experiments that are required to suppress seismic noise.