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

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

Checking the Soviets: The Strange Case of the Spring Constants

Now that we have established the basic parameters, we need to move on to the spring constant calculations. Here we run into some things that frankly don't make a lot of sense, perhaps the reader can help to resolve the dilemmas. The original calculations are here. Let's start by looking again at the basic impact-vibration … Continue reading Checking the Soviets: The Strange Case of the Spring Constants

Checking the Soviets: Finding the Frequency and Establishing Basic Parameters

In our last post Checking the Soviets: A Tale of Two Cities we described the underlying institutions that designed and built impact-vibration equipment. Henceforth, based on this post we will refer to the two groups as the "Moscow" and "Leningrad" groups, to save the reader having to deal with the Cyrillic alphabet soup that Soviet institutions … Continue reading Checking the Soviets: Finding the Frequency and Establishing Basic Parameters

Checking the Soviets: A Tale of Two Cities

In our last post Checking the Soviets: Determining the Eccentric Moment, we looked at a specific calculation of the eccentric moment of an impact-vibration hammer. Before we get further into this topic, it would be good to pause and give some background on how the Soviets developed the impact-vibration hammer. Once it got out of its … Continue reading Checking the Soviets: A Tale of Two Cities

Inclusion of Rotational Inertial Effects in Power Consumption Calculations for Vibratory Pile Equipment Presented at the Chattanooga Development Symposium

The paper Inclusion of Rotational Inertial Effects in Power Consumption Calculations for Vibratory Pile Equipment was presented last Tuesday at the Chattanooga Development Symposium. You can view this presentation in the YouTube video below. https://youtu.be/nHlQ-bQEnXg The abstract--and a clarification--are below. Abstract: Virtually all treatments of power consumption and modelled performance for vibratory pile driving equipment assume … Continue reading Inclusion of Rotational Inertial Effects in Power Consumption Calculations for Vibratory Pile Equipment Presented at the Chattanooga Development Symposium

Checking the Soviets: Determining the Eccentric Moment

This is the first in an aperiodic series on design calculations for a piece of experimental Soviet construction equipment, in this case an S-834 impact-vibration hammer. A more complete history of these machines (a co-author was one of the designers) is here. We're going to compare the calculations originally done on these machines with what … Continue reading Checking the Soviets: Determining the Eccentric Moment

Field Service Manual for Soviet B402/V402 Vibratory Hammer

In 1988 Vulcan personnel visited what was then Leningrad to view the operation of a Soviet variable-eccentric moment vibratory hammer. The account of that is here. This is the field service manual for the hammer. A closeup of the exciter and suspension, clamped to the pile. As is common in Europe, the sheets are picked … Continue reading Field Service Manual for Soviet B402/V402 Vibratory Hammer