Vibroacoustic characteristics analysis of a planetary gear reducer considering the exterior housing structure

Abstract

Abstract. Previous studies have attempted to identify weak links in the dynamic characteristics of the planetary gear reducer (PGR) exterior body structure (EBS). Through numerical simulation, these studies analyzed the mode and natural frequencies and the vibration types of each order of the EBS. However, these scholars have never focused on the main factors affecting the dynamic characteristics of the EBS of this subject. This study in the topic has analyzed the vibroacoustic characteristics of an EBS and optimized its design using numerical simulation. Herein, the contribution of the vibration transfer path from the excitation points on the exterior body to the machine foot is emphatically revealed, and the influences of the main structural parameters on the transfer characteristics are discussed. An optimal EBS for a PGR with lower acoustic vibrations is designed in detail, and a composite EBS with damping vibration attenuation and acoustic absorption is proposed. The radiation acoustic characteristics without acoustic protection and damping materials are analyzed. These research results are implemented in order to realize the dynamic characteristics, transmission, and radiation acoustic characteristics as objects of optimization, and the structural design parameters of the PGR exterior body are deeply optimized using dynamic modification and sensitivity analysis. This topic focuses on the vibroacoustic coupling of EBS in stationary fluid and average flow field. Based on the analysis method of theoretical modeling and numerical calculation, the EBS dynamic response and vibroacoustic characteristics under the action of frontal excitation external acoustic flow field are studied, which will be beneficial to explore the comprehensive optimization design of PGR dynamic and vibroacoustic properties.

Laboratory Tests of Rolling Resistance of Different Tread Profiles for the Wheel of Martian Roverr

“…Table 3 shows the results of the analysis of the rotational speed signal, and in the figure below the conventional reference of the width of a single band to the period of 10 signal bands. Figure 9 shows an example of the spectrum, which takes into account the mechanical parameters [9] calculated above, characterizing the operation of the BLDC motor with the gearbox [10,11]. The authors assumed that since the deflection increases, the contact area of a given tyre with the resisting surface will increase.…”

“…The measure of the BLDC motor load during these measurements, (much like in motors controlled by the level of PWM signal filling), is the variation in the width of rotational speed signal band (Fig. 12) [11,15]. This measure was referred to changes in the tyre deflection for a specific tread pattern in order to determine the relationship between the tyre tread pattern and the generated motor load.…”

Fuzzy algorithm-based active control method for vibration of a mechanical gear transmission system

“…For the acoustic vibration coupling problem of the external body structure of the gear reducer, Jin et al [11] analyzed the vibration transmission path relationship of the external excitation point of the body, designed the results applicable to the low acoustic vibration, and optimized the parameters with the help of dynamic modification and sensitivity analysis. The results showed that the optimized design results have better dynamic response and acoustic vibration characteristics.…”