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Railway products - Test equipment

Variable rotational bending load fatigue machine for railway axles

Outline
Regarding the axles, it is very important to evaluate the actual strength accurately so as to provide both adequate safety and light weight. The fatigue tests of actual axles had been generally carried out under constant load amplitudes due to the performance limitation of the test machines. However, the load on the actual car is always variable, and therefore it is not enough to say that the actual conditions have been simulated during those tests. The new type test machine, introduced in 1995, is able to simulate variable load conditions which are more similar to actual running conditions than constant rotational bending load conditions which is provides by conventional fatigue test machines.

Features
[ Test simulated actual conditions ]

We can verify fatigue strength of the axle including the fitting portions by combining the test axle and test wheel, simulating the actual axle.

[ Automatic controlled test ]

The test can be conducted with the test load up to 157 kN. The test can be operated over an extended period under automatic control with inputting the test conditions into the program.


High speed brake test machine for railway car

Outline
In accordance with the trend for higher speed trains, the requirement to investigate the high speed braking performance of the brake disks of railway cars is increasing. To comply with this requirement, we introduced the high speed brake test machine in 2001 in addition to the traditional tread and disk brake test machine. This machine has capability of testing at a maximum of 600 km/h and can also carry out the basic brake performance test, durability test, as well as other tests such as the run-curve tests where the brake torque, deceleration etc. are controlled under similar conditions to those of the actual running car.

Features
[ Brake tests corresponding to high speed ]

The performance of our brake test machine enables application to high speeds up to 600 km/h (with a wheel diameter of 860 mm). This test machine can investigate the braking performance and durability corresponding to high-speed. (The applicable speed with a wheel diameter of 860 mm is 400 km/h with a severe load as heavy as 16 tons.)

[ Various brake control tests including run-curve ]

Other brake tests can be conducted with controlled constant torque, constant deceleration, etc., which makes the brake tests closely simulate the actual running conditions such as gradient, run-curve, running wind, and others. Furthermore, test data such as average frictional coefficient, torque, etc. can be automatically recorded.


High-speed rotational load test machine with a semi-anechoic chamber exclusive for railway train driving unit

High-speed rotational load test machine with a semi-anechoic chamber exclusive for railway train driving unit
Outline
In 2004, to respond to the requirements for development of new high-speed railway cars such as the Shinkansen bullet trains and so on, we developed and introduced the world's first high speed rotational load test machine installed in a semi-anechoic chamber for acoustic measurement, exclusively used for railway train driving unit, which can be made to simulate actual running conditions. These tests can help make a quieter environment within the rooms of and around the train, as well as lighter and more reliable components and parts.

Features
[ Corresponding to high speed ]

We have attained the maximum test speed of 500 km/h (200 km/h faster than our traditional performance), with which we can easily respond to any requirements for the development of higher speed performance.

[ Assessment through loaded torque on actual car ]

Until the introduction of this test machine, when the performance test of the trains was conducted on the completed trains, driving units could not be evaluated without influence from other parts. However, using this new test machine, the correctly loaded characteristics can be simulated on the individual components.

[ Analysis of acoustic characteristics and foreseeing design ]

By employing a semi-anechoic chamber and a driving system through the axle and the pinion shaft, we can now analyze the noise sources and acoustic characteristics from the driving unit itself without any disturbance from other noise sources. This enables us to conduct foreseeing designs much more adequately.


Rotational test machine for railway car bogie

Rotational test machine for railway car bogie
Outline
The high-speed railway system such as the Shinkansen bullet train has been getting attention from the viewpoint of environment and energy issues. Much higher speeds are also being pursued. The rotational test machine for bogies has a rotating wheel with rails, which are equivalent to the actual train rails on the circular surface of the wheel. The loading frame, which simulates the train car, is set on the circular rails. By rotating the railed wheel that corresponds to the actual rails, we can test and solve beforehand all sorts of issues such as running instability inherent in the high-speed travel of railway cars.

Features
[ Corresponding to high speed ]

We have attained the maximum test speed of 500 km/h, and we can conduct running-stability tests corresponding to the future development of higher speed performance.

[ Corresponding to all kinds of bogies ]

The track gauge and the center-distance of the axles are all changeable on the test machine to enable different tests for various bogies.


Fatigue test machine for railway car bogie

Fatigue test machine for railway car bogie
Outline
The bogies of railway cars need not only to meet severe safety standards but also to be lightweight. Using the bogie fatigue test machine, we can conduct a strength assessment test to check the long-term serviceability by applying repeated loads that simulate the actual usage conditions of the real bogies.

Features
[ Various load conditions ]

The test can be conducted under various load conditional patterns including load wave patterns of sine waves, rectangular waves and so on. Load wave patterns can be simulated to the actual load conditions.

[ Automatic control ]

The fatigue test can be automatically operated for extended periods without any human intervention.


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