The intermediate gear provides spacing but does not affect the gear ratio. For this reason it is called an idler gear.
Introduction The gear transmission system transmits the torque of the motor and is a key element of the locomotive system. During locomotive operation, the gear transmission system is subjected to the mesh force of the gear pair and the wheel-rail impact force.
Therefore, the detection method of the gear transmission system is the key to ensure locomotive safety. In recent years, scholars worldwide have carried out much research on gear dynamics.
Through the dynamic analysis of the gear transmission system, Endo et al. The dynamic behavior of gear wear failure is analyzed by Ding and Kahraman [ 4 ]. InMa and Chen [ 6 ] studied the nonlinear dynamics of a gear system with a tooth root crack. To research the spalling mechanism, Ma et al.
Bahk and Parker developed an analytical model used to study the influence of tooth profile modification on the planetary gear dynamics [ 8 ]. InLi and Peng developed a multi-degree-of-freedom nonlinear gear model that considers the meshing force and tribological force of the gear pair [ 9 ].
To analyze the influence of helical gear wear on the dynamic response of the gear transmission, Brethee et al. At present, scholars have studied the fault diagnosis of the gear transmission system and put forward a series of effective diagnosis methods. To monitor the mechanical condition of a railway traction system, Kia et al.
In [ 12 ], Henao et al. This method is used to identify the damage to the gear transmission system under various operating conditions.
In[ 14 ], Yang and Cheng proposed a damage classification method based on local mean decomposition and principle component analysis methods. In[ 15 ], Kia et al. In[ 16 ], Heydarzadeh et al. In[ 17 ], Chai et al. However, the main object of those methods is to detect the existence of damage.
The detection of the degree of damage of rotating machinery is the focus of this field. In this paper, the locomotive subsystem which can be used to reflect the gear tooth root crack is found.
The degree of tooth root crack damage is detected based on the PCA and Grey relational analysis methods. Vertical Dynamic Model of Locomotive-Track Coupled with Gear Transmission A two-dimensional vertical dynamic model of the locomotive-track coupled with the gear transmission system is developed.
The dynamic model is composed of two parts: The locomotive is modeled as a multirigid body system running on the track.
It consists of one car body, two bogie frames, four wheelsets, four motors, and a gear transmission system. These components are connected by spring-damper elements.
The car body connects with the bogie frame by a secondary suspension. The bogie frame is supported on the wheelset via the primary suspension. One end of the motor is fixed on the bogie frame while the other end of the motor is fixed on the wheelset. Each component of this mathematical model has two vibrational degrees of freedom, which are torsional and vertical.
The track subsystem contains the rail, the sleepers, the ballasts, and the subgrade. The rail is regarded as a continuous Bernoulli—Euler beam.
It is mounted on the sleepers by the rail pads. In the new model, the shear stiffness and shear damping are introduced between the adjacent ballasts.
Each component of this mathematical model has one vibrational degree of freedom, which is vertical. The notation used in this study is shown in Tables 1."Torque is a force that tends to rotate or turn things.
You generate a torque any time you apply a force using a wrench. Tightening the lug nuts on your wheels is a good example. Vehicle speed, engine rpm, overall gear ratio, and tire diameter are all related to a acceleration. For track use, an engine needs to operate within the rpm range where it makes the most power.
The geared system shown in Figure P represents an elevator system. The motor has an inertia I 1 and supplies a torque T rutadeltambor.comt the inertias of the . A mechanical amplifier, or a mechanical amplifying element, is a linkage mechanism that amplifies the magnitude of mechanical quantities such as force, displacement, velocity, acceleration and torque in linear and rotational systems.
The implications are pretty huge if he's right and the numbers come up looking good; as a geared system, the D-Drive is scalable in the extreme, and could remove the need for friction components.
Dec 12, · Until the blue line drops below max traction, the longitudinal car acceleration of both set-ups will be completely equal, but after that, the lower geared set-up will start reducing acceleration (and max throttle can be applied without losing traction), while the higher geared set-up can continue acceleration still a bit at max traction rate.