Shock Absorbers and Rate Controls Shock Absorbers and Rate Controls

ITT Enidine provides quality energy absorption and vibration isolation products and services to a variety of heavy industries throughout the globe. These industries include; steel and aluminum rolling mills, manufacturers of mill equipment, gantry cranes, ship to shore cranes, overhead bridge crane manufacturers and automated stacker cranes. ITT is a diversified leading manufacturer of highly engineered critical components and customized technology solutions for growing industrial end-markets in energy infrastructure, electronics, aerospace and transportation. Building on its heritage of innovation,...

Table of Contents Product Selection General Company Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 New Technologies and Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Theory of Energy Absorption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Sizing Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Company Overview ITT Enidine Inc. Overview Company Overview With its world headquarters located in Orchard Park, New York, USA, ITT ENIDINE Inc. is a world leader in the design and manufacture of standard and custom energy absorption and vibration isolation product solutions within the Industrial, Aerospace, Defense, Marine and Rail markets. Product ranges include shock absorbers, gas springs, rate controls, air springs, wire rope isolators, heavy industry buffers and emergency stops. With facilities strategically located throughout the world and in partnership with our vast global network of...

New Technologies and Enhancements Research and Development New Products and Services ITT Enidine engineers continue to monitor and influence trends in the motion control industry, allowing us to remain at the forefront of new energy absorption product development such as our new ECO Series shock absorbers and our new HDN Series shock Absorbers. Our experienced engineering team has designed custom solutions for a wide variety of challenging applications, including automated warehousing systems and shock absorbers for hostile industrial environments such as glass manufacturing, among others. These...

Theory of Energy Absorption ITT Enidine Inc. Overview Theory of Energy Absorption As companies strive to increase productivity by operating machinery at higher speeds, often the results are increased noise, damage to machinery/products, and excessive vibration. At the same time, safety and machine reliability are decreased. A variety of products are commonly used to solve these problems. However, they vary greatly in effectiveness and operation. Typical products used include rubber bumpers, springs, cylinder cushions and shock absorbers. The following illustrations compare how the most common...

Theory of Energy Absorption ITT Enidine Inc. Overview Shock Absorber Performance When Weight or Impact Velocity Vary When conditions change from the original calculated data or actual input, a shock absorber’s performance can be greatly affected, causing failure or degradation of performance. Variations in input conditions after a shock absorber has been installed can cause internal damage, or at the very least, can result in unwanted damping performance. Variations in weight or impact velocity can be seen by examining the following energy curves: This is explained by observing the structural...

Shock Absorber Sizing Examples Typical Shock Absorber Applications Shock Absorber Sizing Examples Overview SHOCK ABSORBER SIZING RATE CONTROL SIZING Follow the next six steps to manually size Enidine shock absorbers: STEP 1: Identify the following parameters. These must be known for all energy absorption calculations. Variations or additional information may be required in some cases. A. Weight of the load to be stopped (lbs.)(Kg). B. Velocity of the load upon impact with the shock absorber (in./sec.)(m/s). C. External (propelling) forces acting on the load (lbs.)(N), if any. D. Cyclic frequency...

Shock Absorber Sizing Examples Typical Shock Absorber Applications SYMBOLS a = Acceleration (in./sec.2)(mls2) A = Width (in.)(m) B = Thickness (in.)(m) C = Number of cycles per hour d = Cylinder bore diameter (in.)(mm) D = Distance (in.)(m) Ek = Kinetic energy (in-lbs.)(Nm) ET = Total energy per cycle (in-lbs./c)(Nm/c), EK + EW ETC= Total energy to be absorbed per hour (in-lbs./hr)(Nm/hr) Ew = Work or drive energy (in-lbs.)(Nm) FD = Propelling force (lbs.)(N) FP = Shock force (lbs.)(N) H = Height (in.)(m) Hp = Motor rating (hp)(kw) I = Mass moment of inertia (in-lbs./sec2)(Kgm2) K = Radius of...

Shock Absorber Sizing Examples Typical Shock Absorber Applications Shock Absorber Sizing Examples Overview EXAMPLE 3: Vertical Moving Load with Propelling Force Upward STEP 1: Application Data (W) Weight = 3,400 lbs. (V) Velocity = 80 in./sec. (d) 2 Cylinders bore dia. = 6 in. (P) Operating pressure = 70 psi (C) Cycles/Hr = 200 STEP 2: Calculate kinetic energy W WW 3,400 x V2 = x 802 EK = 772 772 EK = 28,187 in-lbs. Assume Model OEM 3.0M x 5 is adequate (Page 31). EXAMPLE 4: Vertical Moving Load with Propelling Force from Motor STEP 3: Calculate work energy FD = 2 x [.7854 x d2 x P] – W FD =...

Shock Absorber Sizing Examples Typical Shock Absorber Applications EXAMPLE 6: Horizontal Moving Load with Propelling Force STEP 1: Application Data (W) Weight = 1,950 lbs. (V) Velocity = 60 in./sec. (d) Cylinder bore dia. = 3 in. (P) Operating pressure = 70 psi (C) Cycles/Hr = 200 STEP 2: Calculate kinetic energy W W EK = x V2 772 1,950 EK = x 60 2 772 EK = 9,093 in-lbs. STEP 3: Calculate work energy FD = .7854 x d 2 x P FD = .7854 x 3 2 x 70 FD = 495 lbs. E W = FD x S E W = 495 x 2 E W = 99O in-lbs. Shock Absorber Sizing Examples Overview STEP 5: Calculate total energy per hour E TC = ET x C...