A running gear for a rail vehicle includes first and second independent wheel assemblies on opposite sides of a longitudinal vertical median plane of the running gear, each having an independent wheel and a bearing assembly for guiding the wheel about a revolution axis fixed relative to the bearing assembly. In a reference position of the running gear, the revolution axes of the first and second wheel assemblies are coaxial and perpendicular to the longitudinal vertical median plane. The running gear further includes one or more steering actuators for moving the bearing assembly of at least one of the two wheel assemblies away from the reference position in a longitudinal direction parallel to the longitudinal vertical median plane, a wheel flange contact detection unit for detecting a contact between a flange of the wheel with a rail, and a controller for controlling the one or more steering actuators.

In a method for stabilizing a rail vehicle with a wheel set, the speed of the rail vehicle is changed when a critical vibration state of the wheel set occurs. An advantageous state can be achieved if the speed of the rail vehicle is changed by using a vibration state variable of the wheel set.

The invention relates to a railway vehicle comprising a car (14) and a bogie (16). The bogie (14) comprises a chassis (28) and a secondary suspension system (30). The secondary suspension system (30) comprises: a set (34) of springs; a jack (36) comprising two ends (44, 46); and a supply device (38) of the jack (36).

The jack (36) is configured to go from a first so-called retracted configuration in which the jack (36) is only connected to the car (14) by the first end (44) to a second so-called deployed configuration in which the jack (36) is also connected to the chassis (18) by the second end (16).

The power supply device (38) is configured, in the deployed configuration, to supply the jack (36) so as to move the car (14) away from the chassis (28) or to keep the distance between the car (14) and the chassis (28) constant.

A high-speed rail train bogie frame includes side sills and cross beams located between the side sills, and each of the side sills is provided with an air spring seat configured to install an air spring; wherein each of the cross beams has a seamless steel tube structure; the frame further includes a passage, and a main air chamber of the air spring and a cavity of the cross beam are in communication with each other through the passage; and an anti-roll bar seat configured to install an anti-roll bar is welded below the side sill, and the anti-roll bar seat is in a circular arc transition with a bottom of the side sill, to form a dovetail structure.

A railway vehicle vibration damping device includes an actuator interposed between a vehicle body and a truck and capable of exerting a control force; and a controller configured to obtain a target control force for reducing a vibration of the vehicle body based on a lateral acceleration of the vehicle body, and the controller includes a bandpass filter configured to extract a low frequency control force, which is a frequency component lower than a resonant frequency of the vehicle body, and a correcting part configured to correct a target control force based on the low frequency control force.

There is provided a controller capable of predicting the maintenance timing of a constituent component such as a board or an electronic component or a cooling fan mounted on a board. The controller (C) of the present invention obtains a remaining life of at least one or more of a substrate (1), an electronic component (2) mounted on the board (1), and a cooling fan (3) based on temperatures detected by temperature sensors (S1), (S2) installed on the board (1).

A semiactive damper of the present invention includes a cylinder, a rod movably inserted into the cylinder, a piston slidably inserted into the cylinder and comparting the interior of the cylinder into a rod-side chamber and a piston-side chamber, a tank, a suction passage permitting only flow of a hydraulic fluid from the tank to the piston-side chamber, a damping passage communicating the rod-side chamber with the tank or the rod-side chamber with the piston-side chamber, and a variable damping valve provided on the damping passage, and a detecting portion for detecting an expansion and contraction direction according to pressure in the piston-side chamber.

The vehicle including an active suspension system (22) parameterized by a set of adjustment parameters. The railway track is cut into segments. For each segment (T), the method includes campaigns for optimization of the set of parameters, such that: during the first campaign, to each passage of the suspension system (22) on the segment (T), a first set of parameters, specific to this passage, is predefined and applied to the suspension system (22), and a comfort quality index is calculated, and then a metaheuristic algorithm is applied for determining second sets of parameters, and during each following optimization campaign, at each passage of the suspension system over the segment, one of the determined sets of parameters by the previous optimization campaign is applied to the suspension system, and the comfort quality index is calculated, and then the metaheuristic algorithm is applied in order to determine new sets of parameters.

A method includes detecting an out of phase condition and an in-phase condition between a vehicle platform and two or more propulsion units attached to the platform. A first speed from a first propulsion unit is compared to a second speed and a torque of one or more propulsion units is controlled to reduce the out of phase condition and/or the in-phase condition when a difference between the first speed and the second speed is greater than a threshold value. A vehicle includes a platform, two or more propulsion units attached to the platform, and a processor. The processor compares a first speed from a first propulsion unit to a second speed, detects from the comparison an out of phase condition between the platform and the two or more propulsion units, and detects from the comparison an in-phase condition between the platform and the two or more propulsion units.

A railway vehicle vibration damping device includes an actuator and a control unit controlling a pump and controls a rotation speed of the pump based on a vehicle speed of a railway vehicle.