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IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni Mecanismos Mecanismos e Máquinas: Grau de Liberdade Prof. Paulo Boni Aula II

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Page 1: IFSC Paulo Boni IFSC Paulo Boni IFSC Paulo Boni IFSC ...joinville.ifsc.edu.br/~pauloboni/MECANISMOS/PDF - Aula II - Grau_de... · Mecanismos e Máquinas: Grau de Liberdade Prof. Paulo

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Boni IFSC Paulo Boni IFSC

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Mecanismos

Mecanismos e Máquinas:

Grau de Liberdade

Prof. Paulo Boni

Aula II

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Conteúdo

• Definição de cadeia cinemática

• Cálculo do grau de liberdade de

um mecanismo

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Junta ou Par cinemático

Par de superfícies mantidas permanentemente em contato

de tal forma a produzir um movimento relativo bem

definido entre elas.

Pode ser:

• inferior: o contato é uma superfície

• superior: o contato é uma reta ou um ponto

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Junta ou Par cinemático

Par cinemático inferior: o contato é uma superfície

Rotativo Deslizante

Superfície 1

(externa do

pino)

Superfície 2

(interna do furo)

Superfície 1

(interna do furo)

Superfície 2

(externa do prisma)

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Junta ou Par cinemático

Par cinemático superior: o contato é um ponto ou

uma linha

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Junta ou

Par

cinemático

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Mobilidade

Representa a soma dos movimentos possíveis em

cada “direção”.

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Mobilidade (Grau de Liberdade)

Representa a soma dos movimentos possíveis em

cada “direção”.

No plano: M=3 No espaço tridimensional: M=6

x

y

xy

z

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Elo (link)

Corpo rígido com dois ou mais pares cinemáticos,

através dos quais se pode conectar outros corpos

Binário Ternário Quaternário

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Cadeia cinemática

Sistema resultante da conexão de vários elos formando um

circuito ou malha e que ainda pode produzir movimento.

Cadeia cinemática aberta Cadeia cinemática fechada

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Mecanismo de cadeia cinemática

simples

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Mecanismo de cadeia cinemática

composta

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Grafo de uma cadeia cinemática

Polígono composto por vértices e arestas, que representa a

conectividade da cadeia cinemática.

Vértices Elos - Números

Arestas Pares cinemáticos - Letras

1

2

3 4

5

d

c

b

a

1

6

e f

g

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Exemplo 1

Bomba de petróleo

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Exemplo 1

1-Identificação dos elos

números

1

2

3

4

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Exemplo 1

1-Identificação dos elos

2-Identificação dos pares cinemáticos

letras

d

1

2

3

4

a

b

c

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Exemplo 1

3

4 1

2

1-Identificação dos elos

2-Identificação dos pares cinemáticos

3-Definição dos vértices

elos

d

1

2

3

4

a

b

c

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Exemplo 1

3

4 1

2

d

a

b

c

1-Identificação dos elos

2-Identificação dos pares cinemáticos

3-Definição dos vértices

4-Definição das arestas

juntas (pares cinemáticos)

d

1

2

3

4

a

b

c

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Inversão

Fixando-se cada um dos elos tem-se um mecanismo diferente (inversão)

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Inversão

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Inversão

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Graus de liberdade (F) de um mecanismo

é o número de parâmetros independentes que são

necessários para se definir a posição de um corpo

noespaço em qualquer instante.

Critério de Gruebler e Kutzbach: M = 3.(N - 1) – 2P1 – P2

M – número de graus de liberdade do mecanismo

N – número total de elos do mecanismo (incluindo o solo)

P1 – número de pares cinemáticos com 1 g.l.

P2 – número de pares cinemáticos com 2 g.l.

Casos:

a) M = 0 Estrutura

b) M > 0 Mecanismo

c) M < 0 Sistema Hiperestático

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M=1 M=2

Graus de liberdade

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Example

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Meia Junta

Junta Múltipla –Três - Elos Ligados P1 = 2

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2.7 Paradoxes

• Greubler criterion does not include geometry, so it

can give wrong prediction

• We must use inspection

E-quintet

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2.5 Mechanisms and Structures

• Mechanism: DOF>0

• Structure: DOF=0

• Preloaded Structure –

DOF<0, may require

force to assemble

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Exemplos

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Exemplos

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Exemplos

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Exemplos

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Exemplos

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Exemplos

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Exemplos

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Exemplos

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Exemplos

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Graus de liberdade (F) de um mecanismo

Exemplo 2:

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Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Graus de liberdade (F) de um mecanismo

Exemplo 3:

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Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

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Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Graus de liberdade (F) de um mecanismo

Exemplo 4:

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IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Graus de liberdade (F) de um mecanismo

Exemplo 5:

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IFSC Paulo Boni IFSC Paulo

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Boni IFSC Paulo Boni IFSC

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Exercícios

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Exercício 1

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IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

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IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exercício 4

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Exercício 5

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Exercício 7

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Exercício 8

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Exercício 9

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Exercício 10

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Comparar

Exercício 11