Yaw damper represents a major source of excitation for flexural vibration of the railway carbody. In order to reduce transmissibility of such undesired excitation, yaw damper should allow for large force transmission at low working frequencies, but should behave as vibration isolator at high working frequencies. Unfortunately, the yaw oil damper (OD), which is nowadays in service, has poor intr...

We consider a heavy piston in an infinite cylinder surrounded by ideal gases on both sides. The piston moves under elastic collisions with gas atoms. We assume here that the gases always exert equal pressures on the piston, hence the piston remains at the so called mechanical equilibrium. However, the temperatures and densities of the gases may differ across the piston. In that case some earlie...

Under the condition of variable rotating speed, it is difficult to extract degradation characteristics axial piston pump, which also reduces accuracy recognition. To address these problems, this paper proposes a state recognition method for pumps by combining spline-kernelled chirplet transform (SCT), adaptive chirp mode pursuit (ACMP), and extreme gradient boosting (XGBoost). Firstly, SCT ACMP...

Abstract When the above-ground space is insufficient to meet traffic demand of people, advantages underground rail transit are particularly prominent. It has short distance, unobstructed and so on, it imperative develop transit. subway train running, will push air forward. Due restriction tunnel’s inner wall on air, a large number piston winds formed. Piston wind harmful running tunnel fire, bu...

We consider a massive inelastic piston, whose opposite faces have different coefficients of restitution, moving under the action of an infinitely dilute gas of hard disks maintained at a fixed temperature. The dynamics of the piston is Markovian and obeys a continuous Master Equation: however, the asymmetry of restitution coefficients induces a violation of detailed balance and a net drift of t...

In view of the working principle a swashplate axial piston pump, simulation model pump was built in AMESim and its output flow pulsation characteristics were simulated analyzed. We mainly analyzed influence speed prime mover, angle, diameter piston, port plate structure on pump. The result this research shows that structure, mover have an important order to effectively reduce generated by noise...

In this paper, a Rankine cycle test system is established to recover exhaust energy from a 2.0 L gasoline engine. Experiments on the system’s performance are carried out under various working conditions. The experimental results indicate that the recovery power of the expander is strongly related to the load and speed of the gasoline engine. It is found that when the output power of the gasolin...