Machine foundation Notes | EduRev

: Machine foundation Notes | EduRev

 Page 1


Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
   Objectives
   In this section you will learn the following
Categories of machine foundations
Types of Machine Foundations
Criteria for the Design of Machine Foundations
Page 2


Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
   Objectives
   In this section you will learn the following
Categories of machine foundations
Types of Machine Foundations
Criteria for the Design of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
 
 
 
Categories of machine foundations
Reciprocating machines:
 
It produces periodic unbalanced force and operating frequency is 600rpm. For designing unbalanced force is
taken as varying sinusoidally.
Impact machines
 
It produces impact loads at an operating frequency of 60-150 blows/min. Dynamic load attends the peak
within short duration and then die out quickly. Designed as over tuned.
Rotary machines:
 
These are high speed machines with high operating frequency. Hence the foundations are designed as under
tuned.
 
 
 
Types of Machine Foundations
Block type
Caisson type
Wall type
 
 
Figure 8.14 Types of Machine Foundations
Page 3


Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
   Objectives
   In this section you will learn the following
Categories of machine foundations
Types of Machine Foundations
Criteria for the Design of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
 
 
 
Categories of machine foundations
Reciprocating machines:
 
It produces periodic unbalanced force and operating frequency is 600rpm. For designing unbalanced force is
taken as varying sinusoidally.
Impact machines
 
It produces impact loads at an operating frequency of 60-150 blows/min. Dynamic load attends the peak
within short duration and then die out quickly. Designed as over tuned.
Rotary machines:
 
These are high speed machines with high operating frequency. Hence the foundations are designed as under
tuned.
 
 
 
Types of Machine Foundations
Block type
Caisson type
Wall type
 
 
Figure 8.14 Types of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
 
 
 
Criteria for the Design of Machine Foundations
1.
Static Loading
 
Without shear failure
 
Without any excessive settlement
2.
Dynamic loading
No resonance
 
As per 2974 part1, r<0.5 (under tuned) 
r>0.5 (over tuned)
The amplitude of motion should not exceed limiting amplitude. Permissible amplitude is 0.2mm.
Vibrations must not be annoying to the persons working in factory or surroundings.
 
 
Fig. 8.15 Displacement amplitude vs. frequency (Richard 1962)
 
 
Page 4


Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
   Objectives
   In this section you will learn the following
Categories of machine foundations
Types of Machine Foundations
Criteria for the Design of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
 
 
 
Categories of machine foundations
Reciprocating machines:
 
It produces periodic unbalanced force and operating frequency is 600rpm. For designing unbalanced force is
taken as varying sinusoidally.
Impact machines
 
It produces impact loads at an operating frequency of 60-150 blows/min. Dynamic load attends the peak
within short duration and then die out quickly. Designed as over tuned.
Rotary machines:
 
These are high speed machines with high operating frequency. Hence the foundations are designed as under
tuned.
 
 
 
Types of Machine Foundations
Block type
Caisson type
Wall type
 
 
Figure 8.14 Types of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
 
 
 
Criteria for the Design of Machine Foundations
1.
Static Loading
 
Without shear failure
 
Without any excessive settlement
2.
Dynamic loading
No resonance
 
As per 2974 part1, r<0.5 (under tuned) 
r>0.5 (over tuned)
The amplitude of motion should not exceed limiting amplitude. Permissible amplitude is 0.2mm.
Vibrations must not be annoying to the persons working in factory or surroundings.
 
 
Fig. 8.15 Displacement amplitude vs. frequency (Richard 1962)
 
 
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
  Recap
   In this section you have learnt the following.
Categories of machine foundations
Types of Machine Foundations
Criteria for the Design of Machine Foundations
Page 5


Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
   Objectives
   In this section you will learn the following
Categories of machine foundations
Types of Machine Foundations
Criteria for the Design of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
 
 
 
Categories of machine foundations
Reciprocating machines:
 
It produces periodic unbalanced force and operating frequency is 600rpm. For designing unbalanced force is
taken as varying sinusoidally.
Impact machines
 
It produces impact loads at an operating frequency of 60-150 blows/min. Dynamic load attends the peak
within short duration and then die out quickly. Designed as over tuned.
Rotary machines:
 
These are high speed machines with high operating frequency. Hence the foundations are designed as under
tuned.
 
 
 
Types of Machine Foundations
Block type
Caisson type
Wall type
 
 
Figure 8.14 Types of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
 
 
 
Criteria for the Design of Machine Foundations
1.
Static Loading
 
Without shear failure
 
Without any excessive settlement
2.
Dynamic loading
No resonance
 
As per 2974 part1, r<0.5 (under tuned) 
r>0.5 (over tuned)
The amplitude of motion should not exceed limiting amplitude. Permissible amplitude is 0.2mm.
Vibrations must not be annoying to the persons working in factory or surroundings.
 
 
Fig. 8.15 Displacement amplitude vs. frequency (Richard 1962)
 
 
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.1 : Introduction ]
  Recap
   In this section you have learnt the following.
Categories of machine foundations
Types of Machine Foundations
Criteria for the Design of Machine Foundations
Module 7 : Design of Machine Foundations
Lecture 32 : Machine foundation [ Section 32.2 : Methods of analysis ]
   Objectives
   In this section you will learn the following
Linear elastic weightless spring MSD model
Linear elastic theory
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