employing the shovel of an excavator as a vibration ...€¦ · employing the shovel of an...

9.10.2004Technical Development CenterSIMPACK User Meeting 2004

FreudenbergDichtungs- undSchwingungstechnik

Employing the Shovel of an Excavator as a Vibration Absorber

Optimisation potential by considering the whole system

Dipl. Ing. Pedro Gomez

Co-Author: Dipl. Phys. Hansjoerg Maier

Technical Development Center

Freudenberg Dichtungs- und Schwingungstechnik KG, Weinheim

SIMPACK User Meeting 2004 - Wartburg

9. November 2004



Freudenberg Group

? aprox. 32.000 employees worldwide (12.500 in Germany)

? 4.000 Mio. Euro in 2003

? 1.157 employees in Research & Development

? Familiar company with a tradition of 150 years of Innovation

? Moody´s Rating 2004 A3 ( 20th. Industrial )

Freudenberg Group - Facts and Figures

? Technical Development Center

? Part of Freudenberg Dichtungs- und Schwingungstechnik

? 82 Employees

? 9,3 Mio. Euro in 2003



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Problem Solution

• Manufacturing of Prototypes

• Parts- Elastomer-Mounts- Hydrobushes- Hydropneumatic Systems

• Mass Production

Simrit,Lead Center

NVH System and Module Engineering• NVH-System-Analysis

- Holistic View on Vehicle

• Problem-Analysis

• Solutions Design

• Concept Studies

• Concept Ratings

• Implementation

Testing

Dynamic Measurements

Electrodynamic Shakers

Experimental Analysis

- Dynamometer - Aechoic Chamber - Road Simulator

Comfort-Benchmarking Structure Borne Noise Analysis

Optimization Mass ProductionVerificationPrototypesAnalysis

Engineering Services and their link to FDS-products



Contents

1. EU-Regulations and ISO-Norms

2. The reason for vibration absortion

3. SIMPACK model

4. Vibration absorption in the Pitch Eigenmode

5. Vibration absorption in the Bounce Eigenmode

6. Optimization potential

7. Conclusions



2002 2004 2006 2008

1. EU Regulations and ISO Norms

National Implementationand Application

2002/44/EG

National Implementationand Application

2003/10/EG

Possible date limit formachines sold before July

2007

Possible date limit foragricultural and forestry

machines

2002 2004 2006 2008 2010 2012 2014

? 2002/44/EG: Vibrations

? Hand/Arm-Vibrations: Release-Value 2.5 m/sec², Limit 5.0 m/sec²

? Body-Vibrations: Release-Value 0.5 m/sec², Limit 1.15 m/sec²

? 2003/10/EG: Acoustics: Release-Value 80 dB(A), 85 dB(A), Limit 87 dB(A)



OUTPUT

Bounce and PitchMovement of the Cabin

INPUT

Displacement from road excitation

mmmm

N

N N

mmmm

N

OUTPUT

Movement of the Shovel

The movement of theshovel is used to disipateenergy which, otherwisewould contribute to thecabin movement.

In order to achieve thisenergy disipation effect,the eigenfrequency of theShovel must bedetermined according tothe cabin characteristics.

Energy

2. The reason for vibration absortion

Driving

direction



Load and Angle Influenced Movement Evaluation Criteria



Energy

The movement of the shovel is usedto disipate energy in the cabinmovement around the Y-Axis.

In order to analyse the results, weobserve the rotation of the cabinaround the Y-Axis.

The red lines represent themovements which are interacting.

The blue line represents themovement represented in the figure.



Motorpower: 44 kW / 60 PSShovel capacity: 0,80-1,20 m³Weight: 4,9 tMax. load: 2 t

11 BodiesMasses:

Chassis ? 4200 kgCabin: 515 kgShovel: 125 kg ( empty )

23 DOF (total)7 DOF (restricted)

3. SIMPACK Model



Frequency [Hz]

Frequency [Hz]

108 8.5 9 9.56 6.5 7 7.54 4.5 5 5.50 0.5 1 1.5 2 2.5 3 3.5

4 4.52 2.5 3 3.50 0.5 1 1.5 5 5.5 6 6.5 107.57 8 8.5 9 9.5

Bounce

Roll

Pitch

Yaw

Cabin Eigenfrequencies

Transversal

Longitudinal



Pitch-Mode Bounce-Mode

Cabin rotation about the Y-axis ( Pitch )

Frequency [Hz]

Am

plitu

de



Frequency [Hz]

Frequency [Hz]

108 8.5 9 9.56 6.5 7 7.54 4.5 5 5.50 0.5 1 1.5 2 2.5 3 3.5

4 4.52 2.5 3 3.50 0.5 1 1.5 5 5.5 6 6.5 107.57 8 8.5 9 9.5

Bounce

Roll

Pitch

YawTransversal

Longitudinal

Sho

vel


without Tuned Mass Absorber



Parameter Variation - Rotation around Y-Axis

Frequency [Hz]

Am

plitu

de

4. Vibration absorption in the Pitch Eigenmode



Reduction of 50%

Without TunedMass Absorber

With TunedMass Absorber

Rotation around Y-Axis

Frequency [Hz]

Am

plitu

de



Frequency [Hz]

Frequency [Hz]

108 8.5 9 9.56 6.5 7 7.54 4.5 5 5.50 0.5 1 1.5 2 2.5 3 3.5

4 4.52 2.5 3 3.50 0.5 1 1.5 5 5.5 6 6.5 107.57 8 8.5 9 9.5

Bounce

Roll

Pitch

Transversal

Longitudinal

ShovelYaw




with Tuned Mass Absorber



Parameter Variation - Rotation around Y-Axis

Frequency [Hz]

Am

plitu

de

5. Vibration absorption in the Bounce Eigenmode



Frequency [Hz]

Am

plitu

de

Reduction of 36%

Rotation around Y-Axis

Without TunedMass Absorber

With TunedMass Absorber



Frequency [Hz]

Frequency [Hz]

108 8.5 9 9.56 6.5 7 7.54 4.5 5 5.50 0.5 1 1.5 2 2.5 3 3.5

4 4.52 2.5 3 3.50 0.5 1 1.5 5 5.5 6 6.5 107.57 8 8.5 9 9.5

Roll

Pitch

Transversal

Longitudinal

Yaw




with Tuned Mass Absorber

Bounce

Shovel



20%

0%

5%

40%

16%

25%

36%

50%

6. Optimization potential



? It is possible to use the shovel of an excavator as a vibration absorber for the cabin byconsidering the excavator as a whole system.

? The use of the shovel as a vibration absorber can reach up to 50% of reduction in the pitch movementof the cabin.

? The stiffness of the shovel hanging system, for this studied case, lies between 90 and 320 [N/mm]. Apossible solution is the use of an hydraulic cylinder.

? The use of other sub-components of the excavator, like for example the motor, show also essentialimprovement.

7. Conclusions



Thank you very much for your attention.

Dipl. Ing. Pedro Gomez Izquierdo

Technical Development Center

Freudenberg Dichtungs- und Schwingungstechnik KG, Weinheim

employing the shovel of an excavator as a vibration ...€¦ · employing the shovel of an...

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