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Test Stand Applications for Force and Torque

In the world of test and measurement, test stands are essential equipment for manufacturers and testing engineers. The test stand provides a host of different testing products in a single “cabinet-like” structure. These systems have been used for a long time to gather data on various functions of products during the product test phase.

Test stands works like a mobile test lab, hosted by a frame and containing one or more force or torque sensor components, software, and data acquisition instrumentation and accessories. Force stands are typically motorized or manual.  Motorized test stands, also known as mechanical or electrical, have the advantages of controlling performance by applying modes such as speed, cycles, and time into the testing procedure. The more advanced testing stands are frequently used for repetitive high-performance testing requirements, validating accuracy and quality. Manual test stands are used for simple testing protocols and frequently used in education programs.

There are a wide variety of testing devices and sensor products that are used as part of the entire test process. As parts roll off the production line, the test stand will sit at the end of the line where the test engineer can immediately load the product into the test rig. Test stands help to streamline the test process by providing all available test functions in a single, mobile application.

Interface is a supplier of choice for precision components of various capacities and dimensions for test stand configurations requiring precision and accuracy in performance. Interface load cells, torque transducers, and instrumentation equipment are commonly used in numerous product test applications by engineers, metrologists, testing professionals and product designers around the world.

Included below are a few examples of specific test applications and the Interface components used in the different style testing stands.

Linear Test Stand

In this example, an Interface customer wanted to add a crush test to their test stand to measure the force it took to deform a piece of material. Interface provided an Model 1210 Load Cell with an internal amplification of 0-10VDC output.

The load cell was installed into the load string of the customer’s load frame, and the scaled analog output from the load cell was connected to the customer’s test stand instrumentation. When the force levels reached the crushing point, the customer’s software was able to read the output of the amplified load cell and record the value.

See the application note for the Linear Test Stand here.

Motor Test Stand

In the quality control lab at a major automotive manufacturing company, a test engineer needed to test, record, and audit the torque produced by a new motor design under start load. Interface supplied the new AxialTQ® Rotary Torque Transducer that connected between the motor and the differential, on the drive shaft, that could measure and record these torque values.

Based on the data collected using the AxialTQ transducer, along with the AxialTQ Output Module, and a laptop, the test engineer was able to make recommendations to optimize the amount of torque created by the new motor design.

See the application note for the Motor Test Stand here.

Verification Test Stand

In this application, a customer needed a test stand application to verify that its load cell was in good, working order. Interface helped to create a solution that used a load cell to verify the customer’s load cell. The solution involved the customer’s supplied verification load frame and an Interface Model 1210 Precision LowProfile® Load Cell connected with a Model SI-USB 2-Channel PC Interface Module.

The customer was able to install their load cell and Model 1210 Precision LowProfile Load cell into the verification load frame. Applied forces were displayed and recorded by Model SI-USB PC Interface Module for review and record keeping on customer’s computer. This allows the customer to have a proven load cell verification test stand at their disposal to ensure its test load cell is always in working order.

See the application note for the Verification Test Stand here.

These are just a few examples of the different types of test stands that Interface can provide off-the-shelf or custom force measurement solution components. If your project involves a mechanical test stand and you are interested in learning more about adding force sensors, please contact our application engineers.

The Future of Automotive is Electric

Interface has been a longtime provider of force measurement solutions that help engineers develop the technology of tomorrow. One of our main areas of expertise during our 50 plus years in business has been in solutions for the automotive industry.

Interface has helped to revolutionize design and efficiency in this industry using our high accuracy test and measurement solutions. With the increased need for sustainable electric vehicles, we have set our sights on advancing this high-growth area in automotive.

“Less than 5 percent of vehicles sold in 2016 were equipped with EV power trains. Major OEMs have announced that they’re aiming to bring that number above 50 percent by 2021.” McKinsey Quarterly, February 2019

Electric vehicle design and manufacturing requires a precise level of accuracy in order to improve energy efficiency, minimize weight and maximize vehicle range. Battery technology has only come so far; therefore, maximizing power output is the key to improving vehicle design. To achieve this, test and measurement solutions need to be as accurate as possible.

Interface provides high accuracy torque transducers, load cells, load washers and more for two areas of electric vehicle testing: laboratory testing to optimize system performance and production testing to ensure product quality.

Interface’s Role in Vehicle Testing

Laboratory Testing

In laboratory testing, Interface force and torque measurement products are used to achieve high-efficiency in component and system designs. While electric vehicle designs are already very efficient, minimal design adjustments can make a difference to increase total range from a single charge. Making small incremental changes in efficiency, therefore, requires very accurate measurement capability.

Applications of our products in the laboratory environment include maximizing the system performance of electric vehicle drivetrain components, such as motors and gearboxes. As well as performance in auxiliary systems, such as air conditioning compressors and motors, power steering motors, and even brake systems. Accurately measuring the force of dynamic systems like suspension components allow the designer to minimize weight to improve overall vehicle range and performance.

Production Testing

Once the components are moved into the vehicle production phase, Interface solutions are used to ensure the product has been built per the design.  Our products can be used to measure the steady state, as well as the dynamic performance of components and systems.  Using measurement systems they can trust gives customers the confidence that the components and systems meet the performance and dependability expected for the vehicle design.

The key to electric vehicle design is balancing the relationship between efficiency, performance, and cost.  The further we can make electric vehicles go on a single charge, the more attractive these vehicles become for mass markets.

Optimized efficiency requires the most accurate measurements available to our customers and this is where Interface excels. Jake Shaffer, Senior Product Manager

In October 2018, Interface released AxialTQ, specifically designed to help in the transforming vehicle market, including electric and autonomous vehicles. You can read about AxialTQ and view this revolutionary next-generation torque measurement system in action here:

If you are interested in scheduling a demonstration of the product or inquiring about Interface’s precision solutions like AxialTQ that we are providing for force measurement testing of electric vehicles, contact us today.

Contributor:  Jake Shaffer, Senior Product Manager at Interface