PR 311.2 Page 1
Test Specification PR 311.2
Measurement of Annoying Noi
(Rattling/Creaking) for Components and
早期维新思想Overall Vehicle
6 980 065.6
PR 311.2
UPG: 06.96
Note:
The ur of this document is obliged to obtain information regarding the validity of the relevant technical specification.
Dept. code Name/Signature Date
Author EI-351 S.Imminger 15.07.2005 Manager EI-351 C. Amann 15.07.2005
Table of Contents
1Scope of Validity (4)
2Quasi-Static Test (4)
2.1Introduction and Definitions (4)
2.2Test Implementation (4)
3Pul Load (4)
3.1Introduction and Definitions (4)
3.2Test Implementation (5)
4Dynamic Test Translation (6)
4.1Introduction and Definitions (6)
4.2Test Implementation (6)
4.2.1Precondition (6)
4.2.1.1Number and Selection of Test Specimens (6)
4.2.1.2Test Environment (6)
4.2.1.3Test Frame (6)
4.2.1.4Test Equipment (7)
4.2.2Test Setup (7)
4.2.2.1Positioning of Acceleration Pick-Ups (8)
4.2.2.2Microphone Positions (8)
4.2.3Test Procedure (8)
4.2.3.1Conditioning of Test Specimens (8)
4.2.3.2Excitation Profiles (9)
4.2.3.3Recording Measured Data (9)
4.3Asssment and Documentation (9)
4.4Objective Asssment with the OCIAN Method (11)
4.4.1Functional Principle of the OCIAN Method (11)
5Annoying Noi Test Under Audio Excitation (12)
5.1Scope of Validity (12)
5.2Test Environment (13)
商家联盟
5.3Test Setup (13)
5.4Test Procedure (14)
5.5Asssment and Documentation (15)
Annex A – Excitation profile Shaker tests (16)
Annex B – Sensor positioning (17)
内存扩展Annex C – Documentation Standard – Annoying Noi Test (18)不定冠词有哪些
Change documentation
NRCL Drwg.
index Change
index
Short description Date Responsibility
EGR90U A 01 Relead for production 18.07.2005 S.Imminger, EI-351 EGD98V A 02 Quasi-static test added 29.05.2006 M. Reichelt, EI-33 EGD98V A 02 Test pul load added 29.05.2006 M. Reichelt, EI-33 EGD98V A 02 "Instationary annoying noi" test from
PR311.1 has been changed slightly and
relocated under the point "Dynamic test
translation"
29.05.2006 M. Reichelt, EI-33
EGD98V A 02 "Annoying noi test under audio
excitation" added
29.05.2006 M. Reichelt, EI-33
1 Scope of Validity防晒霜和隔离霜先用哪个
This test specification is an integral part of the technical specification and applies to approval and qu
ality tests both in the development pha as well as in ries production.
The test specification is to be ud in connection with components which have a contact point that could cau annoying noi.
未休年假补偿标准
Freedom of annoying noi is to be verified both before as well as after a life test.
Definition of contact point
In this context, the term contact point refers to any point at which two components have a spacing of less than 5 mm with respect to each other. The contact point test is to be performed objectively with a suitable DMU tool (e.g. clash analysis in Catia V5).
2 Quasi-Static Test
2.1 Introduction and Definitions
A short-term or longer quasi-static load occurs in respon to contact/movement of components in the vehicle. This load may ari as the result of, for example, applying load on the centre armrest, supporting the knee against the centre console while cornering, making contact with a trim strip etc.
The freedom of annoying noi under the load conditions is verified with the following test tup. 2.2 Test Implementation
Test tup:
The asmbly is cured in the same position as installed in the vehicle on a sufficiently rigid test frame, car body ction etc. under real conditions. The test (same as the rigidity tests) is to be performed in a quiet test environment max. NR35 (Noi Rating Curve, ISO 1996) and under the climatic conditions described under 4.2.3.1. If necessary, the test specimens are to be preconditioned to the test temperature.
a) An alternating force of 15 N (10x in succession) is applied by means of a 15 mm diameter test plunger on all points of the component surface accessible by the customer (thumb test).
b) An alternating force of 15 N (10x in succession) is to be applied on all components which are connected at more than three mounting points (fixed, positively locked, interlocked) (thumb test).
c) All static rigidity and strength tests defined in the technical specification or test specifications are to be performed 10x in succession.
Measurement:
In the ca of doubt, the asssment is to take place subjectively following the objective procedure described under Point 4.
3 Pul Load
3.1 Introduction and Definitions
The freedom of annoying noi is to be tested under pul excitation and verified for all components that are subjected to forces with a short-term effect (components in doors, flap/lids, sun visors etc.).
3.2 Test Implementation
Test tup:
The asmbly is cured in the position as installed in the vehicle on a sufficiently rigid test frame, car body ction etc. under real conditions. The test is to be performed in a quit test environment max. NR35 (Noi Rating Curve, ISO 1996) and under the climatic conditions described in Section 4.2.3.1. If necessary, the test specimens are to be preconditioned to the test temperature. The test is
to be performed both without load as well as with standard load applied by the customer. For this purpo, the flaps, compartments, pockets etc. in or on components are to be loaded with (standard customer) weights to ensure freedom of annoying noi when ud under standard customer conditions. Example: door pocket in door trim panel 1.5 kg
A) Pul excitation of doors and boot lid (rear hatch):
The doors and boot lid (rear hatch) are clod 10x at a speed of approx. 3 m/s
B) Pul excitation during operation (sun visor, switch, ...)
Operated 10x under standard customer u conditions.
Measurement:
In the ca of doubt, the asssment is to take place subjectively following the objective procedure described under Point 4.
4 Dynamic Test Translation
4.1 Introduction and Definitions
The test with translational excitation by means of a quiet shaker is designed to simulate the excitations occurring on the component with the aim of detecting annoying noi. Freedom of noi under the load conditions is to be verified using the described method. In view of the complex interrelationships in terms of perceiving annoying noi, the tested component must be additionally assd subjectively by the inspector as free of annoying noi.
Decisive influencing variables relating to the asssment of instationary annoying noi include frequency and perceptibility of the occurring annoying noi. Influencing variables such as concealing effects are to be taken into account in the asssment procedure.
4.2 Test Implementation
The OCIAN method is recommended for objectively asssing the measured annoying noi. However, an alternative asssment method is permitted if the results can be correlated to the OCIAN method.
4.2.1 Precondition
4.2.1.1 Number and Selection of Test Specimens
The test for annoying noi must be conducted on at least 3 test specimens that were produced on different days. The material and optional equipment variants are to be taken into account and tested accordingly. In view of the occasional lack of availability of suitable test specimens, the test may be limited to one test specimen per variant during the early stage in development. This test is then considered as an individual test, from which no effective conclusions can be drawn in terms of the general product quality. The size of the random samples taken for tests accompanying ries production is to be agreed upon with the Quality Manager at BMW AG responsible for the respective component.
4.2.1.2 Test Environment二成语
The operating noi in the test environment with a shaker system, including the test frame (without component corresponds to max. NR35 (Noi Rating Curve, ISO 1996). The operating noi is to be documented in the test tup as defined under 4.2.2.
4.2.1.3 Test Frame
The test frame must correspond to the installation position of the component in the vehicle. In particular, all the connection points of the components to the car body or to the main asmbly must
be correspondingly replicated. A test report of the measured connection points with respect to the current data record can be requested from BMW for the purpo of verifying the geometry.
草哭
The entire test tup, especially the test specimen retaining fixture, must be free of rattling, creaking and squeaking nois. For this purpo, the test frame (without component) is to be tested under the excitation conditions specified under 4.2.3.2.
The test tup (with component) is subjected to the specified vibration profile as part of the resonance test. Transmission of the applied excitation is to be checked with at least 4 acceleration pick-ups (particularly at the mounting points). As from a frequency of 100 Hz, a maximum level elevation of
3 dB, measured at the component with respect to the excitation, is permitted. At a frequency below 100 Hz, the maximum deviation from the excitation may be 1 dB.
The permissible values can be redefined together with the respective test engineer as required.
