Mechanical & Fluid Systems

Minimum Incremental Motion and Holding Stability in Beamline Positioning

Many beamline applications such as X-ray microscopy and Computed Tomography (CT) require positioning of samples, detectors, and optics in order to perform measurements. Microscopy applications often require imaging of the structure of matter at the sub-micrometer and even nanometer level. Good holding stability, both short-term and long-term, is required because movement of the sample or optics over the time of measurement will cause poor images. Also, the ability to make small mechanical movements on the order of nanometers is often critical for alignment and adjustment of samples or optics.

Posted in: White Papers

Read More >>

Use Metal Bellows To Replace Springs

Servometer metal bellows are utilized for metallic hermetic seals, volume compensators, pressure and temperature sensors, flexible connectors, and countless other applications where quality, dependability, and long life are critical requirements. In this whitepaper, we evaluate the use of an electrodeposited metal bellows as a replacement for a metal spring in mechanical and electrical systems. The bellows offers various benefits to create a cost-effective repeatable solution.

Posted in: White Papers

Read More >>

Nonlinear Model Predictive Control

This whitepaper presents an automatic workflow for implementing Model Predictive Control (MPC) controllers. The process uses MapleSim to generate a model of the system, whose dynamic equations are then extracted using Maple. Next, Maple is used to formulate the MPC problem, and generate the solver, which it automatically converts into the C code of the MPC controller. The advantage of using Maple is that the required procedures and their corresponding derivatives are computed and optimized whenever there is a change in the dynamic equations. The use of Maple saves time, removes human error, and produces highly optimized controller code.

Posted in: White Papers

Read More >>

Gear Shift Modeling and Analysis for Automatic Transmissions in MapleSim

In this paper, a simple dynamic physical model of an automatic transmission was created to evaluate all required forces and motion characteristics of the system during the shift process. Gear shift quality was assessed by setting different timing sequences for the engage/disengage process of the frictional components (pressure on the clutches), during the upshift process. The output torque of the transmission was analyzed under two conditions, with the timing to apply/remove pressure from the clutches being different in both cases.

Posted in: White Papers

Read More >>

Proper Bearing Handling Can Help Prevent Failures

Ball bearings are extremely precise mechanisms, which in many cases have geometrical tolerances measured in millionths of an inch. When handling, inspecting or mounting bearings, one should treat them as precision instruments. Most bearing failures are caused by the user's poor handling techniques.

Posted in: White Papers

Read More >>

The Ultimate Shaft-To-Hub Connection

Polygon Shapes - Multi-Faceted Problem Solvers Kinematically ground polygonal shapes have been used as drive connections for more than 45 years. What is now referred to as Polygon Systems was developed by Fortunawerke, Stuttgart, West Germany, who patented a grinding machine capable of producing matched polygonal shaft and bore diameters.

Posted in: Mechanics, White Papers, White Papers

Read More >>

Heavy Duty Shaft Coupling Strategies

Heavy-duty shaft couplings have traditionally had a couple of defining design characteristics. For one, these couplings usually rely on keyed shaft connections. For another, they tend to be overengineered with regard to stiffness. Keyed connections and excessively rigid coupling designs do have some under-recognized limitations— especially in large industrial, material handling, construction and mining machines.

Posted in: White Papers

Read More >>

White Papers

SWaP-C and Why Your Component Partner Matters
Sponsored by Sparton
Selecting Miniature Motors for your Medical Devices
Sponsored by Portescap
Microelectronics Package for Extreme Environments
Sponsored by MSK Products
Molds for Medical Technology
Sponsored by Husky
Antenna Basics
Sponsored by Rohde and Schwarz A and D
Nitinol Implant Design & Manufacturing
Sponsored by Norman Noble

White Papers Sponsored By:

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.