Cable clamp bolt fixture facilitates assembly in close quarters

Cable clamp bolt holding fixture facilitates forming of electrical cable runs in limited equipment space. The fixture engages the threads of the short clamp bolt through the clamp and maintains tension against clamp tendency to open while the operator installs the nut without difficulty

Electronic Components Subsystems and Equipment: a Compilation

Developments in electronic components, subsystems, and equipment are summarized. Topics discussed include integrated circuit components and techniques, circuit components and techniques, and cables and connectors

Electrical hand tools and techniques: A compilation

Space technology utilization for developing tools, adapters, and fixtures and procedures for assembling, installing, and servicing electrical components and equipment are discussed. Some of the items considered are: (1) pivotal screwdriver, (2) termination locator tool for shielded cables, (3) solder application tools, (4) insulation and shield removing tool, and (5) torque wrench adapter for cable connector engaging ring. Diagrams of the various tools and devices are provided

VELO Module Production - Cable and Clamp Attachment

This note describes in detail the procedures used in the fixing of the clamps to hold the cables in position on the pedestal in the final module assembly for the LHCb VELO detector modules. It summarizes the effects on the module of applying the cables

Pneumatic PID with Ultrasonic Distance Feedback

Indiana University Purdue University IndianapolisIndiana University–Purdue University Indianapolis (IUPUI) is initiating a new course to the Electrical & Computer Engineering Technology (ECET) Curriculum in the spring of 2019, this course is Advanced Process Controls. The lab curriculum for this course needed a functional application to demonstrate the use of a proportional–integral–derivative controller (PID). The lab location for this course has one important limitation, specifically no use of water; therefore, our design integrates the use of pneumatics. Using the lab’s existing Rockwell Automation PLC and software package, this design uses the PLC’s PID instruction to maintain an extension length on a pneumatic single acting cylinder. This closed control loop consists of the PLC and analog I/O card, an ultrasonic distance sensor, one pneumatic cylinder for the controlled variable, one pneumatic cylinder as a disturbance, and two Proportion-Air QB1X analog controlled pneumatic solenoids. The final design in summary, uses the ultrasonic sensor to provide feedback to the PID with the current extended length of the pneumatic cylinder. This establishes any error, and the properly tuned PID uses this feedback to respond accordingly to ensure the desired extension length of the cylinder is maintained.Electrical Engineering Technolog

A single-axis space simulator for testing the OGO altitude control system

Single axis space simulator for OGO attitude control system test

A system for PEA space charge measurement on HVDC mini-cables under different isothermal temperatures: Influence of cable clamping force on PEA measurements on HVDC mini-cables

A Pulsed Electro-Acoustic (PEA) apparatus has been developed to measure the space charge distribution inside cable insulation. The technique relies on acoustic contact between the cylindrical cable surface and a flat aluminium plate to couple the acoustic waves to the sensor. This work addresses the practical issue of the clamping force required to maintain good contact and how this may alter the measured space charge distribution. Space charge measurements on mini-cables (model cables)were carried out over a wide range of clamping force and additionally a finite-element simulation model has been developed to model mechanical deformation of mini-cables and provide data that cannot be easily obtained from experiments. A clamping force range for reproducible measurements at room temperature has been determined by comparing results from a group test on a mini-cable

Symmetry in Structural Health Monitoring

In this Special Issue on symmetry, we mainly discuss the application of symmetry in various structural health monitoring. For example, considering the health monitoring of a known structure, by obtaining the static or dynamic response of the structure, using different signal processing methods, including some advanced filtering methods, to remove the influence of environmental noise, and extract structural feature parameters to determine the safety of the structure. These damage diagnosis methods can also be effectively applied to various types of infrastructure and mechanical equipment. For this reason, the vibration control of various structures and the knowledge of random structure dynamics should be considered, which will promote the rapid development of the structural health monitoring. Among them, signal extraction and evaluation methods are also worthy of study. The improvement of signal acquisition instruments and acquisition methods improves the accuracy of data. A good evaluation method will help to correctly understand the performance with different types of infrastructure and mechanical equipment

Design & Engineering of the iconic spherical shell of the Academy Museum of Motion Pictures, LA

Renzo Piano Building Workshop designed a 290,000 sf museum celebrating the artistry and technology of film, becoming the world’s first museum and event space devoted to the Motion Picture. The 388 Mio USD project consist of a six story tall renovated existing building and a dome-shaped iconic new building housing a 1,000-seat theater. Both buildings are linked by several – partially suspended – bridges. The 150 ft diameter dome is a steel grid shell with cable bracing and flat, shingled glass panels on a secondary layer. The single-layered curved structural steel tubes have a diameter of 4 inches only. With an airy and weightless quality, the globe’s structure seems to dissolve into the background. The construction of the steel glass structure was completed in autumn 2019; grand opening of the museum is planned for summer 2020. Knippers Helbig was responsible for design and engineering of the structure and glazing system of spherical glazed gridshell structure from concept stage until signed and sealed drawings and calculations and was responsible for design and engineering of the bridges during Design Development

The Apollo 15 deployable boom anomaly

During the Apollo 15 mission, a boom with an attached mass spectrometer was required to retract periodically so that the instrument would not be in the field of view of other experiments. The boom did not fully retract on five of 12 occasions. Data analysis indicated that the boom probably retracted to within approximately 2.54 centimeters (1 inch) of full retraction. The pertinent boom-design details, the events in the mission related to the anomaly, a discussion of the inflight and postflight investigation of the problem, a discussion of the design changes to the boom mechanism as a result of the investigation, and subsequent flight performance are presented