RAILWAY VEHICLE WHEEL DEVELOPMENT AND QUALITY CONTROL
Testing Degree of Wear on Wheel Bearings and Rails
Measuring vibration and noise proves helpful for maintenance of bearings and wheel flanges in railway vehicles
Repeated braking of railway vehicles causes wear leading to vibration and noise, both sources of reduced ride quality. Noise and vibration from wheel bearings during forward and reverse motion is measured and put into a database to determine the normal range of noise and vibration.
By comparing the measured values of noise and vibration with the database, the degree of wear of the wheel can be estimated.
RA2000A series digital oscillographic recorders connect directly to piezoelectric acceleration sensors, sound level meters or microphones and automatically print and record data as needed.
Rail-wheel Contact, Vibration and Noise Measurement System
The Current State of Frictional Force Adjustment
Conventional trains can run at about 60 mph on straight track and track that curves at a radius of 200m or less. Sections connected to sharply curved track require speeds less than 25 mph. The frictional force between the wheel and rail is the largest external force affecting movement characteristics of a railway vehicle. On straight track a large frictional force is required for the driving force and braking force. However, when the frictional force becomes too great it can be a source of wheel flange and rail wear as well as noise on curved tracks. The friction coefficient can have large fluctuations over the day due to temperature and humidity. Maintaining an appropriate friction coefficient is important for track and train maintenance.
|2CH High Resolution Amp||AP11-101||±100mV ~ ±500V, A/D res 16bit 10ìs|
|2CH High Speed Amp||AP11-103||±100mV ~ ±500V, A/D res 12bit 1ìs|
|Event Amp||AP11-105||Input: 8 logic (Voltge/Contact)|
|2CH TC-DC Amp||AP11-106A||Input: R • T • J • K • W (±100mV ~ ±50V)|
|2CH AC Strain Amp||AP11-104A||Response Frequency: 2KHz|
|2CH DC Strain Amp||AP11-110||Response Frequency: 50KHz|
|2CH Vibration/RMS Amp||AP11-109||±100mV ~ ±500V|
|F/V Converter||AP11-108||Input: 1KHz ~ 10KHz|
Did You Know?
The RA Series (RA2300MKII pictured upper left) simultaneously measures voltage, current, control timing, vibration, rotation, pressure and more directly from sensors. Recorded data can be converted to .csv data or used with FFT analysis software.