I know I've spent a fair amount of time on site anniversaries this year. Those include the quarter century anniversaries of my two original sites: vulcanhammer.net and Positive Infinity. But I think it would be remiss if I didn't stop and say something about this one. I don't have an exact date when I uploaded … Continue reading Fifteen Years of vulcanhammer.info
The Effect of Batter on Hammer Energy
Most people involved in the pile driving business know that, when you drive piles on a batter (angle) the energy from the hammer is reduced. But how much? This post attempts to answer that question, and show how Vulcan dealt with the issue. Let's start with single-acting hammers like the Warrington-Vulcan hammers: the rated striking … Continue reading The Effect of Batter on Hammer Energy
So What is the Force of the Ram?
The whole point of impact pile driving is for a moving mass to be stopped "suddenly" and in the process generate a high peak force impulse which moves the pile into the soil. Pile dynamics people tend to emphasise the force on the pile head, while hammer manufacturers tend to emphasise the peak force of … Continue reading So What is the Force of the Ram?
There Was a Good Reason To Develop North Sea Oil and Gas
The recent (apparent) sabotage of the NordStream gas line from Russia to Germany--and the effects of the loss of Russian energy to Europe--is a reminder to some of us of some fairly recent history about Europe and energy that bears repeating. Europeans used to be a lot better about remembering history than Americans, but it … Continue reading There Was a Good Reason To Develop North Sea Oil and Gas
Billiards and Pile Driving: Newtonian Impact Mechanics and Dynamic Formulae
One thing that many of the "old heads" in this business wish would come back are the dynamic formulae. In some cases they're still important as they're written into the codes. So how did they come into being? As noted in my discussion of The Engineering News Formula, and Its Treatment in Early Vulcan Literature, many … Continue reading Billiards and Pile Driving: Newtonian Impact Mechanics and Dynamic Formulae
Checking the Soviets: The Life of the Bearings
The last of our series on "Checking the Soviets" will deal with the roller bearings for the S-834. Roller bearings, be they spherical or cylindrical, are an important part of vibratory pile driving equipment, although for Vulcan's machines cylindrical bearings were the rule. The bearings (#4 in the diagram above) were GOST 5721-57 3614 bearings. … Continue reading Checking the Soviets: The Life of the Bearings
Checking the Soviets: The Long and The Short of It in Beam Analysis
In the last post Checking the Soviets: Determining the Bending Moment and Stress, and the Parallel Axis Theorem, we looked at a section which was represented to act as a beam. We learned that, if that's true, then the way to reduce stresses isn't just to add material, but to add it judiciously. In this section … Continue reading Checking the Soviets: The Long and The Short of It in Beam Analysis
Moscow : A Short Guide – Chernov — Mir Books
In this post, we will see the book Moscow : A Short Guide by Vladimir Chernov. About the book To the reader This guide is a short account of Moscow and its principal points of interest for the foreign tourist who is visiting the city for the first time and has a limited time at […] … Continue reading Moscow : A Short Guide – Chernov — Mir Books
Checking the Soviets: Determining the Bending Moment and Stress, and the Parallel Axis Theorem
In this section we'll discuss the bending moment of the section which connects the two rotors. It's worth noting that, from a vibratory operational standpoint, the two sets of rotors and eccentrics and self-synchonising, which means that, as they rotate, the amplitude of the vibrations synchronise the rotations. This was applied to vibratory equipment by … Continue reading Checking the Soviets: Determining the Bending Moment and Stress, and the Parallel Axis Theorem
Checking the Soviets: Determining the Bending of the Shaft
In our last post Checking the Soviets: The Strange Case of the Spring Constants we discovered some discrepancies in the design of the springs which, although essentially correct, were hard to explain given the information furnished. In this analysis an entirely different problem is encountered, one which is more familiar to practicing engineers. The problem at … Continue reading Checking the Soviets: Determining the Bending of the Shaft
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