Fatigue Analysis of Dozer Push Arms under Tilt Bulldozing Conditions

Tilt bulldozing generates unbalanced loads on two push arms, which leads to the service lives of the two push arms being different. Because the push arms rotate in triaxial directions during tilt bulldozing, it is difficult to accurately analyze the fatigue life of the push arm with one specific boundary condition and loading history. Therefore, a fatigue analysis of the push arms under tilt bulldozing conditions is proposed based on co-simulation of RecurDyn-EDEM-AMESim in this paper. The control of tilt bulldozing conditions is realized automatically according to the tilt angle and blade depth. The dynamic loads of the push arms are accurately calculated in this virtual model. Subsequently, the stress–time histories are obtained to investigate the fatigue lives of push arms. Both the overall damage and the initiation positions of the cracks are predicted herein. It is determined that the fatigue lives of the right and left push arms are 7,317.84 h and 39,381.89 h, respectively. Thus, the life of the push arm on the blade’s tilted side is reduced by 81.42% compared to the other side. Additionally, experimental tests are conducted to verify the accuracy of the virtual model. Analysis results indicate that the strains of the push arms according to the virtual simulation are close to those measured in the experiments.

Virtual Simulation

Virtual simulation is a learning tool that employs specific hardware and software technology for simulation-based provider training within a digital domain. Extended reality or XR software includes virtual reality (VR), augmented reality (AR), and mixed reality (MR) programs that represent a rapidly growing area within the field of virtual simulation. This training may provide either provider- or patient-centered learning modules, with dedicated hardware and software centered on skill-based, 3D modeling or case-based learning. Demand for these learning programs in healthcare education was fueled by the remote learning needs of the COVID-19 pandemic. In addition to this growing demand, there is a significant role for many virtual simulation software programs within the traditional classroom and lecture hall. This is a previously untapped resource for simulation education. The flipped classroom model provides an opportune framework for the incorporation of immersive, virtual simulation learning programs within spaces previously limited to the more passive, podium-based lecture.

Research on performance test analysis method of mechanical structure based on measured error / virtual simulation

Mechanical errors seriously affect the transmission performance of mechanical structure, especially for high-precision mechanical structure. With the development of virtual simulation technology, the performance test of mechanical structure in virtual environment is gradually applied. Under the background, this paper takes the movable tooth reducer as the research object and puts forward a virtual performance test method by combing test errors with virtual simulation technology. The tooth profile errors of key components of the reducer are obtained by optical scanning, and the simulation test is carried out. Meanwhile, the accuracy of the simulation test is verified by the implementation of vibration test. The results show that both the simulated vibration acceleration and the experimental test vibration acceleration show a double-peak variation trend, and the frequency difference between the two peaks is less than 5%. Therefore, the simulation test method proposed in this paper can effectively evaluate the performance of mechanical structures.