View Paper: "High-performance Elevator Control System"

Prior to joining us as Chief Engineer, Clem Skalski was an Advanced Technology Consultant
to our firm. From 1977-1999 Dr. Skalski was Principal Engineer with Otis Elevator Company.
Prior to 1977 he was with MITRE Corporation, providing technical support to the Federal Railroad
Administration (FRA) and Urban Mass Transit Administration (UMTA). His elevator-related
experience includes the following areas:

• Preliminary system design studies
• System analysis and simulation using Matlab®
• Product innovation, proof of concept, and outsourcing
• Vertical and horizontal ride quality measurements
• Motion control systems for high-rise elevators
• Cost-effective, mass-produced elevator systems
• Safety and control systems using radars and lasers
• Electronic safety governors and techniques for elevators
• Active roller guide and magnetic guidance systems
• Design of various control circuits, sensors and actuators
• Load-measuring and pre-torque control techniques
• Rotary and linear motors and drives (DC, induction, synchronous)
• Automated people mover systems

Clem established the motion control technique used on Otis high-rise elevators, and proposed
and built active vibration controls to improve the ride of high-speed elevators. He has designed
and built a cost-effective linear-motor door operator, and was responsible for testing motion and
active vibration controls. Dr. Skalski was instrumental in introducing Matlab® and other advanced
simulation tools at Otis. He has solved many dynamic controls problems relating to systems
having structural resonances, nonlinearities and time-variable parameters. His prior work at Mitre
included the review of contractors' reports and plans submitted to the FRA. This work related to
advanced propulsion and suspension, railroad electrification, signaling and communications, and
braking systems. His work has also included advanced studies in linear motors and magnetic
suspensions. Clem holds degrees in Electrical Engineering through the PhD from Rensselaer
Polytechnic Institute, Cornell University, Columbia University and Northeastern University. He
is a Registered Professional Engineer in Connecticut, holds 28 patents, has authored numerous
publications, and is a senior member of IEEE.

Résumé, 24 Years Elevator Experience,
Prior Experience in Horizontal Transportation

Barker Mohandas, Connecticut
Chief Engineer, Barker Mohandas, LLC
Skalski Associates, Connecticut
Advanced Technology Consultant to Barker Mohandas, LLC
Otis Elevator, Research & Development, Connecticut
Principal Systems Engineer
MITRE Corporation, Washington Operations
Member Technical Staff - Systems Engineering
Northrop Electronics, Precision Products Division
Group Leader, Principal Scientist
AC Electronics (General Motors)
Principal Investigator, Unconventional Accelerometer Device
Kearfott (Now a Division of Singer)
Group Leader, Design-Build Team, One of First Ring Laser Gyros
Norden Systems, Division of United Technologies
Microwave Engineer, Group Leader on R&D of Radar Systems