High Speed Train Tilt Control

High Speed Train Tilt Control Downloads » Tilt Control Application Note  The sole purpose of train tilt control is passenger comfort. In the United States, high-speed trains must share the same tracks as all other rail services. Since the tracks were not initially designed for high speeds, especially in turns, the passenger cars of these trains are tilted while turning to alleviate the effects of centrifugal forces. A tilt sensor is required that can provide highly accurate data on the vehicle dynamics to a computer that determines the degree of corrective tilt required to assure a smooth ride. Watson Industries responded to this need by developing and producing the Train Measurement System (TMS-E232). The TMS provides superelevation (roll angle), roll rate, yaw rate and lateral acceleration output data.   Watson Experience Watson Industries initially brought the TMS to market in 1993. In 1997 Watson began large-scale production to supply Amtrak’s Acela high speed train. Applicable Products TMS-E232 DMS-E604 DMS-EGP01 (DMS with GPS) Technical Challenges One of the most difficult problems with this application is the required mounting location of the tilt sensor. To provide accurate track data, the sensor must be mounted directly to the suspension bogie. Many solid-state gyros manufactured today are too shock and vibration sensitive for the bogie’s 4 G vibration environment. However, the gyro sensors that are used by Watson are rugged and will output accurate data in this environment for extended periods of time. Furthermore, a gyro mounted on the outside of a train cab must be enclosed in a rugged case to protect it from weather, debris, pressure washing and EMI/RFI. The Watson TMS...

Inertial Warehouse Navigation

Inertial Warehouse Navigation Downloads » Warehouse Navigation Application Note  For higher efficiency, reliability and lower costs, robotic material handling equipment are used to move shipments in large warehouses. An inertial navigation system is needed for the vehicle to negotiate its way through the building. The gyros in this inertial navigation system must be extremely stable because the warehouse environment does not support the use of a magnetic or GPS heading reference. For this application, Watson Industries produces the Dynamic Measurement System (DMS). The DMS provides the full array of sensors necessary in an inertial navigation system along with a relative heading output. Our gyros are also available for integration into larger navigation systems.   Watson Experience Watson Industries been involved in the development and production of inertial navigation products for this application since 1988. Applicable Products DMS-E604 DMS-S605 Pro Gyro® rate sensors Technical Challenges Navigation inside of a warehouse is a very challenging environment. Dead reckoning with occasional absolute fixes is used. The heading of the vehicle in needed so that its position in the warehouse can be calculated. Directly integrating a heading gyro will provide information on relative heading. Gyro drift and the Earth’s rotation will slowly cause errors in the heading reading. To overcome this difficulty, navigation systems typically employ a heading update system. The two most common and cost-effective types of heading reference systems are a magnetic compass and GPS. Inside of a warehouse, the sensor cannot properly detect the Earth’s magnetic field and it shielded from the signal from GPS satellites. These challenges create the need for a relative heading system based on the direct integration...

Cable Supported Stabilized Camera

Cable Supported Stabilized Camera Downloads » Cable Supported Stabilized Camera App Note  At sporting events, getting as close to the action as possible without interfering with the athletes is the goal. Video cameras suspended by cables allow the audience to feel like they are on the field without disturbing the competitors. This application has strong commercial value since a more exciting telecast will draw a larger viewing audience. For optimal quality, a vertical reference system is required that is stable and capable of holding the camera level even during accelerations and cable oscillations generated by the wind or other causes. Watson Industries produces sensor packages that work very well in this application. Our VRS line of vertical references has a proven track record of accurate level sensing even while under acceleration.   Watson Experience Watson Industries been involved in the development and production of vertical reference products for gyro stabilized cameras since 1990. Applicable Products VRS-E232-1AD ADS-C232-1A Pro Gyro® Rate Gyros Technical Challenges A camera suspended by cables is very susceptible to oscillations whether they are generated by the wind or by changing the camera’s position. This makes it very difficult to keep the camera stabilized and level, because the dynamics of the application are better compensated for by a long time constant, but removing these errors quickly requires a short one. This problem is overcome with Watson Industries proprietary data processing algorithms and our variable time constant settings. The Watson VRS line of vertical references is a microprocessor based system that is capable of changing the time constant of the system depending on the current situation of the camera....

Pipeline Telemetry

Pipeline Telemetry Downloads » Pipeline Telemetry Application Note  Routine pipeline maintenance is done by placing a solid cylindrical device, called a “pig”, in the pipeline. To monitor the physical profile of the pipeline, a gyroscope package is installed in a pig. As the gyro sensor travels along the pipeline, it records data indicating its orientation and motion. When the pig exits the pipeline, the data is compared to a previous profile to look for significant differences that could indicate a problem with the pipeline. Using an automated gyro sensor to perform routine inspections is typically more cost effective than visually inspecting the entire pipeline. This allows for more frequent inspections that enable maintenance personnel to proactively respond to any problems that are detected. Watson Industries produces a gyro sensor that is well suited to this application. The Dynamic Measurement System (DMS) outputs data on the inertial position of the pipeline pig including relative heading.   Watson Experience Watson Industries been involved in the development and production of inertial gyro products for this application since 1990. Applicable Products DMS-E604 DMS-S605 Technical Challenges An inertial gyro sensor package inside of a pipeline presents several challenges. The sensor must be accurate at all attitudes, since the pig is free to rotate as it travels down the pipeline. The DMS can also occasionally experience highly dynamic conditions that require gyros with a range that is wide enough to track all the motions involved. Another problem with the pipeline environment is that there is no velocity data available to correct for centrifugal forces encountered in transit, so extremely stable gyros are necessary. The Watson Industries...

Railway Track Testing

Railway Track Testing Downloads » Railway Track Testing Application Note   Accurate and detailed data on track conditions is critical for the safety of rail passengers and employees. While there are significant technical challenges in manufacturing gyros for this environment, Watson Industries has the expertise, the technology and the proven experience to provide the best products for this application. Watson Industries manufactures inertial gyro sensor packages that give data on track superelevation (roll angle), roll rate, yaw rate, truck hunting, and track irregularities.   Watson Experience Watson Industries has been supplying inertial gyro sensors to the rail industry since 1987. In that time several types of products have been supplied to many customers. Applicable Products TMS-E232 ProAccel® Accelerometers DMS-E604 DMS-EGP01 (DMS with GPS) DMS-S605 DMS-SGP01 (DMS with GPS) Technical Challenges The accuracy needed in this demanding environment requires the best sensors. Gyros with low drift and superior noise performance are critical to measuring superelevation angle. Furthermore, these gyros must withstand the high vibrations of railway track testing without induced noise errors. Watson Industries has incorporated our most rugged gyros into our railway inertial sensor packages. These gyros are proven to provide superior performance in this environment for extended periods of time.   Requirements Roll Angle: ±15° Rate range: ±50 ° /sec Lateral acceleration: ±0.5 G, 2 G rms Shock: 200 G Temperature: -40° C to +50° C Vibration: 4 G rms Velocity Input: Our sensors in this application require a velocity input from an outside source. There are three options for this input: An analog voltage, digital RS-232 signal, or pulses from an encoder wheel. Typical Options We are able...