JP6256709B2 - Evaluation test method and evaluation test device for closing sound of automotive opening and closing parts - Google Patents
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Description
本発明は、ドアやトランクリッド、エンジンフード等の自動車用開閉部品の閉止時の閉まり音、特にアウターパネルの反転に起因する閉まり音の音質変化の評価試験方法および評価試験装置に関するものである。 The present invention relates to an evaluation test method and an evaluation test apparatus for a change in sound quality of a closing sound caused by reversal of an outer panel, particularly a closing sound when closing an automobile opening / closing component such as a door, a trunk lid, and an engine hood.
ドアやトランクリッド、エンジンフード等の自動車用開閉部品の閉まり音、特にドアの閉まり音は、これまでは特に高級車において重視され、キャビンの内圧制御やドアシールの構造などで対策が検討されてきた。しかしながら近年は、普及価格帯の小型車でも質感向上の要求が高くなってきている。 The closing noise of automobile opening and closing parts such as doors, trunk lids, and engine hoods, especially the closing noise of doors, has been emphasized especially in high-end cars, and countermeasures have been studied for controlling the internal pressure of cabins and the structure of door seals. . However, in recent years, there is an increasing demand for improving the texture of small cars in the popular price range.
小型車は、高級車と比較し燃費が重視されるため、要求される車体軽量化のレベルが高く、そのためドアアウターパネルの板厚が高級車よりも薄い傾向にある。それゆえ相対的にドア自体の重量が軽く、ドアが重いほど有利であるドア閉まり音の重厚さの観点では不利であり、対策は困難であると考えられている。 Small cars have a higher level of weight reduction required because the fuel efficiency is more important than luxury cars, and therefore the door outer panel tends to be thinner than luxury cars. Therefore, the weight of the door itself is relatively light, and the heavier the door is, the more advantageous it is from the viewpoint of the heavy door closing sound, and it is considered difficult to take countermeasures.
一方、アウターパネルが薄くなると、閉まった時のアウターパネルの振動が大きくなり、その振動および反転音が質感を低下させる。小型車は一層の燃費向上が要求されており、ドアアウターパネルのさらなる板厚低減の要求が高いことから、アウターパネルの振動、反転による閉まり音の質感低下への対策が必要になっている。 On the other hand, when the outer panel is thinned, the vibration of the outer panel when it is closed increases, and the vibration and inversion sound deteriorate the texture. Small cars are required to further improve fuel efficiency, and there is a high demand for further reduction in the thickness of the door outer panel. Therefore, it is necessary to take measures to reduce the sound quality of the closing sound due to vibration and inversion of the outer panel.
ドア閉まり時のアウターパネルの振動対策方法として特許文献１には、アウターパネルとドアビームの間にシール材を設けてアウターパネルの振動を吸収する方法が開示されており、さらに特許文献２には、ドアインナーパネルに取り付ける樹脂補強部に放射状のパターンを配することで、ドア閉まり時の音の重厚さを感じるとされる低周波音を増大させるドアモジュールでの対策方法が開示されている。 As a countermeasure against vibration of the outer panel when the door is closed, Patent Document 1 discloses a method of absorbing a vibration of the outer panel by providing a sealing material between the outer panel and the door beam. A countermeasure method for a door module is disclosed in which a low-frequency sound, which is supposed to feel the heavy sound when the door is closed, is increased by arranging a radial pattern on a resin reinforcing portion attached to the door inner panel.
しかしながら上記特許文献には、これらの構造によってどの程度の閉まり音向上効果があったかについての記述や、その実験での評価方法についての記述が無く、具体的な対策検討の内容については不明である。 However, in the above-mentioned patent document, there is no description about how much the closing sound is improved by these structures, and no description about the evaluation method in the experiment, and the contents of the specific countermeasure examination are unknown.
図３（ａ）は、自動車のフロントドアの表側、図３（ｂ）は、そのフロントドアの裏側を例示する説明図であり、このようにドアの表側には広い面積のアウターパネルが配置され、ドアの裏側には前端側にヒンジ取付部、後端側にロック部が設けられている。また図４は、自動車の車体に対するフロントドアとバックドアの開閉状況を例示する説明図であり、ドアの閉まり音は、図４に示すように前端部または上端部をヒンジで支持されたドアで車体開口部を閉じると同時にドアの後端部または下端部のロック部を車体のラッチ部に噛み合わせる際に発生する。 FIG. 3A is an explanatory view illustrating the front side of a front door of an automobile, and FIG. 3B is an explanatory view illustrating the back side of the front door. Thus, a large area outer panel is arranged on the front side of the door. On the back side of the door, a hinge mounting portion is provided on the front end side, and a lock portion is provided on the rear end side. FIG. 4 is an explanatory view illustrating the opening / closing state of the front door and the back door with respect to the vehicle body of the automobile. The door closing sound is generated by a door whose front end or upper end is supported by a hinge as shown in FIG. Occurs when the locking part at the rear end or lower end of the door is engaged with the latch part of the vehicle body simultaneously with closing the vehicle body opening.
このため、ドアアウターパネルの振動による閉まり音の評価は、実車組み付け状態で実際に検査者がドアを閉めて官能的に評価する実車評価が一般的である。従って、ドア閉まり音の実物評価をするためには、最低でも車体を１台分試作する必要があり、評価に要する時間、費用が膨大となってしまう。さらに、ドアの形状や、車体に取付くヒンジやラッチ部の位置は車種によって変わるため、対象車が変わるとそのたびに車体の試作が必要になる。 For this reason, the evaluation of the closing sound due to the vibration of the door outer panel is generally an actual vehicle evaluation in which the inspector actually closes the door and sensuously evaluates in the actual vehicle assembled state. Therefore, in order to actually evaluate the door closing sound, it is necessary to make a prototype of at least one vehicle body, and the time and cost required for the evaluation become enormous. Furthermore, since the shape of the door and the position of the hinges and latches attached to the vehicle body vary depending on the vehicle type, a prototype of the vehicle body is required each time the target vehicle changes.
以上のように、ドアアウターパネルの振動対策の検討においては、その検証のために非常に時間がかかり、費用も膨大にかかることから、多くのケースについての対策検討が十分に出来ないという問題がある。 As described above, in the examination of vibration countermeasures for the door outer panel, it takes a very long time for the verification, and the cost is enormous. is there.
これに関し、本発明者は、実際のドア閉め時のアウターパネルの振動・反転挙動を高速度カメラにより観察した結果、ドア閉め時のアウターパネルの振動・反転挙動はドア内圧要因よりも、車体内側に向かって運動していたドアがラッチ部で停止した際に働くアウターパネルへの慣性力が起因となって生じるということを見出した。そして、車体を試作することなくドア単体で評価を行っても実車実験と同様の状態を再現し得ると考えた。 In this regard, as a result of observing the vibration / reversal behavior of the outer panel when the door is actually closed with a high-speed camera, the vibration / reversal behavior of the outer panel when the door is closed is more It has been found that the inertial force acting on the outer panel that works when the door that is moving toward the door stops at the latch portion is caused. And we thought that the same state as the actual vehicle experiment could be reproduced even if the door alone was evaluated without making a prototype of the car body.
それゆえ本発明は、上述の本発明者の知見に鑑みて、前記従来技術の課題を有利に解決した自動車用開閉部品の閉まり音の評価試験方法および評価試験装置を提供することを目的とする。 Therefore, in view of the above-mentioned knowledge of the present inventor, an object of the present invention is to provide an evaluation test method and an evaluation test apparatus for a closing sound of an automotive opening / closing component that advantageously solves the problems of the prior art. .
前記課題を解決する本発明の自動車用開閉部品の閉まり音評価試験方法は、
剛性部材の上部に、自動車用開閉部品を支持するヒンジと、前記自動車用開閉部品のロック部に噛み合うラッチ部と、を具えてなる自動車用開閉部品の閉まり音評価試験装置を用い、
前記自動車用開閉部品の閉まり音評価試験装置の前記ヒンジを、前記自動車用開閉部品のヒンジ取付部に取り付けた後、前記自動車用開閉部品の前記ロック部側の部分を持ち上げて、前記剛性部材へ向けて落下させ、前記ロック部と前記ラッチ部とを噛み合わせることで、前記自動車用開閉部品が閉まる際の挙動を再現することを特徴とするものである。
A closing sound evaluation test method for an automotive opening and closing part of the present invention that solves the above-described problems is as follows.
Using an automobile opening / closing component closing sound evaluation test device comprising a hinge that supports the opening / closing component for an automobile and a latch portion that meshes with a lock portion of the opening / closing component for an automobile, on the rigid member,
After attaching the hinge of the automotive opening / closing component closing sound evaluation test apparatus to the hinge mounting portion of the automotive opening / closing component, the portion on the lock portion side of the automotive opening / closing component is lifted to the rigid member The behavior when the automobile opening / closing component is closed is reproduced by dropping the door and engaging the lock portion and the latch portion.
また、前記課題を解決する本発明の自動車用開閉部品の閉まり音評価試験装置は、
剛性部材の上部に、自動車用開閉部品を支持するヒンジと、
前記自動車用開閉部品のロック部に噛み合うラッチ部と、
を具えてなるものである。
Moreover, the closing sound evaluation test device for an automotive opening / closing component of the present invention that solves the above-described problems
On the upper part of the rigid member, a hinge that supports the opening and closing part for automobiles,
A latch portion that meshes with a lock portion of the automotive opening and closing component;
It is made up of.
なお、本発明の自動車用開閉部品の閉まり音評価試験方法においては、好ましくは、前記自動車用開閉部品が閉まる際の挙動を高速度カメラで撮像して自動車用開閉部品のアウターパネルの変形挙動を観察することとし、さらにはその高速度カメラを二台用いて、自動車用開閉部品のアウターパネルに設けたグリッドマーカーを撮像することで、そのアウターパネルの３次元的な変形挙動を定量的に観察することとする。 Note that, in the closing sound evaluation test method for an automotive opening / closing component of the present invention, preferably, the behavior when the automotive opening / closing component is closed is imaged with a high-speed camera, and the deformation behavior of the outer panel of the automotive switching component is observed. By observing, and using two high-speed cameras, the grid markers provided on the outer panel of the automotive opening and closing parts are imaged, and the three-dimensional deformation behavior of the outer panel is quantitatively observed. I decided to.
また、本発明の自動車用開閉部品の閉まり音評価試験装置においては、好ましくは、前記ヒンジと前記ラッチ部との少なくとも一方が、前記ヒンジと前記ラッチ部との相対位置を変更可能な支持部を介して前記剛性部材に支持されており、前記支持部は、好ましくは、前記剛性部材にマトリックス状に配置された複数の取付孔または、前記剛性部材にスライド可能かつ固定可能に支持された支持部材とされる。 Moreover, in the closing sound evaluation test apparatus for an automotive opening / closing component of the present invention, preferably, at least one of the hinge and the latch portion has a support portion capable of changing a relative position between the hinge and the latch portion. The support portion is preferably supported by a plurality of mounting holes arranged in a matrix in the rigid member, or a support member that is slidably and fixedly supported by the rigid member. It is said.
本発明の自動車用開閉部品の閉まり音評価試験方法および本発明の自動車用開閉部品の閉まり音評価試験装置によれば、車体１台分を試作することなく、自動車用開閉部品単体でアウターパネルを閉じる際の振動・反転挙動およびその時の音を評価することができ、これにより、車体１台分の試作を行わなくても自動車用開閉部品のみの試作で試験が可能であるので、時間、費用とも従来よりも低減することができる。 According to the closing sound evaluation test method for an automotive opening / closing component of the present invention and the closing sound evaluation test apparatus for an automotive opening / closing component of the present invention, the outer panel can be formed with a single vehicle opening / closing component without producing one vehicle body. It is possible to evaluate the vibration / inversion behavior and sound at that time when closing, so that it is possible to test with a prototype of only the opening and closing parts for automobiles without having to make a prototype for one car body. Both can be reduced as compared with the prior art.
以下、本発明の実施の形態を図面に基づき詳細に説明する。図１（ａ）〜（ｃ）は、本発明の自動車用開閉部品の閉まり音評価試験装置の一実施形態を用いた、本発明の自動車用開閉部品の閉まり音評価試験方法の一実施形態におけるフロントドアの閉まり音評価試験の手順を示す説明図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 (a) to 1 (c) show an embodiment of a closing sound evaluation test method for an automotive opening / closing component of the present invention using an embodiment of a closing sound evaluation test device for an automotive opening / closing component of the present invention. It is explanatory drawing which shows the procedure of the closing sound evaluation test of a front door.
本実施形態の自動車用開閉部品の閉まり音評価試験方法によれば、図１（ａ）に示すように、自動車用開閉部品としてのフロントドアを閉じる際の衝撃に耐えるための剛性部材としての剛体床上に、フロントドアのヒンジ取付部に取り付けられるヒンジと、そのフロントドアのロックと噛み合うラッチ部とを具えるとともに、例えばフロントドアの角部等に対応する位置にゴムブッシュ等の図示しないドア受け冶具を具える、本実施形態の自動車用開閉部品の閉まり音評価試験装置を用い、図１（ａ）に示すように、その閉まり音評価試験装置のヒンジを試験対象のフロントドアのヒンジ取付部に取り付けた後、そのフロントドアの、ラッチ部と相対するロック部側を持ち上げ、図１（ｂ）に示すように、剛体床へ向けて落下させることにより、図１（ｃ）に示すように、閉まり音評価試験装置のラッチ部とフロントドアのロック部とが噛み合い、剛体床でフロントドアの動きが止められるため、フロントドアのアウターパネルに下向きの慣性力が働くので、アウターパネルの振動・反転挙動を再現することができる。 According to the closing sound evaluation test method for an automotive opening / closing component of the present embodiment, as shown in FIG. 1 (a), a rigid body as a rigid member for withstanding an impact when closing the front door as the automotive opening / closing component. Provided on the floor with a hinge attached to the hinge attachment portion of the front door and a latch portion that engages with the lock of the front door, and a door receiver (not shown) such as a rubber bush at a position corresponding to a corner portion of the front door, for example Using the closing sound evaluation test apparatus for an automobile opening and closing part of the present embodiment having a jig, as shown in FIG. 1A, the hinge of the closing sound evaluation test apparatus is a hinge mounting portion of a front door to be tested. After attaching the front door, lift the lock part side of the front door facing the latch part and drop it toward the rigid floor as shown in FIG. As shown in FIG. 1 (c), the latch part of the closing sound evaluation test device and the lock part of the front door are engaged with each other, and the movement of the front door is stopped on the rigid floor. Because the force works, the vibration / inversion behavior of the outer panel can be reproduced.
なお、フロントドアが車両上下方向に沿って湾曲していて曲率を持つ場合は、ヒンジやラッチ部と剛体床との間に適宜スペーサーを設置し、ヒンジやラッチ部をかさ上げすることで、フロントドアのロック部以外の場所が先に閉まり音評価試験装置に当接しないようにしても良い。また、フロントドアのインナーパネルの周辺部に、ドアシールを模擬したゴムなどの弾性体を設置しても良い。 If the front door is curved along the vertical direction of the vehicle and has a curvature, install a spacer appropriately between the hinge or latch and the rigid floor, and raise the hinge or latch to A place other than the lock part of the door may be closed first so as not to contact the sound evaluation test apparatus. Moreover, you may install elastic bodies, such as rubber | gum which simulated the door seal, in the peripheral part of the inner panel of a front door.
さらに、本実施形態の自動車用開閉部品の閉まり音評価試験装置では、ヒンジとラッチ部の相対位置を調整可能とされているため、車種を問わず試験が可能である。剛体床へのヒンジとラッチ部との少なくとも一方の取付けは、本実施形態では剛体床に図示しない多数のネジ穴をマトリックス状に配置して開け、そこに図示しない留めネジでヒンジとラッチ部との少なくとも一方を固定しているが、例えば連続的な位置調整が容易な市販品のアルミ押出成形による角柱状レール材を剛体床上にその表面に沿わせて固設し、その角柱状レール材に支持部材をスライド可能かつボルト等で固定可能に嵌合させて、その支持部材でヒンジやラッチ部を支持するようにしても良い。 Furthermore, in the closing sound evaluation test apparatus for an automotive opening / closing component of the present embodiment, the relative position between the hinge and the latch portion can be adjusted, so that the test can be performed regardless of the vehicle type. In this embodiment, at least one of the hinge and the latch part is attached to the rigid floor by arranging a plurality of screw holes (not shown) in a matrix in the rigid floor and opening the hinge and the latch part with fastening screws (not shown). At least one of these is fixed, for example, a prismatic rail material made by aluminum extrusion, which is easy to continuously adjust the position, is fixed on the rigid floor along the surface thereof. The support member may be slidably fitted and fixed with a bolt or the like, and the hinge or the latch portion may be supported by the support member.
さらに、本実施形態の自動車用開閉部品の閉まり音評価試験装置では、フロントドアが閉まった瞬間のアウターパネルの変形挙動を高速度カメラにより観察することが可能である。その場合に、例えばアウターパネルに付与したグリッドマーカーを二台の高速度カメラで同時に撮影して写真測量の原理で各グリッドマーカーの３次元位置を求めることで、アウターパネルの３次元形状を連続的に定量観察することもできる。 Furthermore, in the closing sound evaluation test apparatus for an automotive opening / closing component of this embodiment, the deformation behavior of the outer panel at the moment when the front door is closed can be observed with a high-speed camera. In that case, for example, the grid markers attached to the outer panel are photographed simultaneously with two high-speed cameras, and the three-dimensional position of each outer marker is obtained continuously by obtaining the three-dimensional position of each grid marker by the principle of photogrammetry. It is also possible to observe quantitatively.
アウターパネルに付与するグリッドマーカーは、ドットの格子状パターンであれば、ドットの直径や間隔は問わない。またグリッドマーカーは、直接アウターパネルに印刷しても構わないが、薄いマグネットシートやラッピングフィルムのような薄いフィルムの表面に印刷してアウターパネルに貼り付けて使用しても構わない。さらに、アウターパネルの変形挙動の撮像に使用する高速度カメラは、５００Ｈｚ以上のサンプリング速度で映像および画像が記録可能であれば、種類は問わない。 As long as the grid marker provided on the outer panel is a lattice pattern of dots, the diameter and interval of the dots are not limited. The grid marker may be directly printed on the outer panel, but may be used by printing on the surface of a thin film such as a thin magnet sheet or a wrapping film and attaching it to the outer panel. Furthermore, the high-speed camera used for imaging the deformation behavior of the outer panel is not limited as long as it can record video and images at a sampling speed of 500 Hz or higher.
（実施例）
本実施形態の評価装置の鳥瞰図を図１（ａ）に示し、そこに取り付けたフロントドアのロック部を落下させた状態を図１（ｂ）に示し、そしてロック部が剛体床のラッチ部に到達し、噛み合ってフロントドアが停止した状態を図１（ｃ）に示している。図２は、この実施形態の評価装置を用いた本実施形態の評価方法の一実施例として、フロントドアのアウターパネルに、スプレー塗装でグリッドマーカー（２ｍｍφ，２０ｍｍ間隔）を描いた厚さ０．４ｍｍのマグネットシートを貼り付けて、二台の高速度カメラでアウターパネルの画像を記録し、アウターパネルの３次元形状を測定した結果を示している。なお、上記高速度カメラは、２０００Ｈｚのサンプリング速度にてデータ採取した。
(Example)
FIG. 1A shows a bird's eye view of the evaluation apparatus of the present embodiment, FIG. 1B shows a state in which the lock portion of the front door attached thereto is dropped, and the lock portion is a latch portion of the rigid floor. FIG. 1C shows a state in which the front door stops after reaching and meshing. FIG. 2 shows an example of the evaluation method of this embodiment using the evaluation device of this embodiment. The thickness of the outer door panel of the front door is drawn with grid markers (2 mmφ, 20 mm intervals) by spray coating. A result of pasting a 4 mm magnet sheet, recording images of the outer panel with two high-speed cameras, and measuring the three-dimensional shape of the outer panel is shown. The high speed camera collected data at a sampling rate of 2000 Hz.
このデータ採取の結果、フロントドアが停止した直後に、アウターパネルがドア外側から見て先ず車内側へ凹変形し、次いで車外側へ凸変形し、さらに車内側へ凹変形するというように、アウターパネルが振動している様子を定量的に測定することができた。 As a result of this data collection, immediately after the front door stops, the outer panel first deforms concavely toward the inside of the vehicle as viewed from the outside of the door, then convexly deforms outwardly of the vehicle, and further deforms concavely toward the inside of the vehicle. It was possible to quantitatively measure how the panel vibrates.
本実施例では静止画で解析した結果を示しているが、本実施形態の評価方法によれば、高速度カメラのサンプリングレートに合わせて連続的に解析することも可能であり、動画でアウターパネルの形状の変化を観察することも可能である。 In this example, the result of analysis with a still image is shown. However, according to the evaluation method of this embodiment, it is also possible to analyze continuously according to the sampling rate of the high-speed camera, and the outer panel can be displayed as a movie. It is also possible to observe changes in the shape of
以上、図示例に基づき説明したが、この発明は上述の例に限られるものでなく、所要に応じて特許請求の範囲の記載範囲内で適宜変更し得るものであり、例えば、上記実施形態の評価方法および評価装置は自動車用開閉部品の一種であるフロントドアに適用されているが、本発明はこれに限られず、例えばトランクリッドやエンジンフード等の他の自動車用開閉部品にも適用することができる。 Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims as required. Although the evaluation method and the evaluation apparatus are applied to a front door which is a kind of automotive opening / closing component, the present invention is not limited thereto, and may be applied to other automotive opening / closing components such as a trunk lid and an engine hood. Can do.
また、上記実施形態の評価装置は、剛性部材として剛体床を用いているが、本発明はこれに限られず、剛性部材として例えば箱状断面の構造物やトラス構造の剛性フレーム等を用いても良い。さらに、上記実施形態の評価方法ではフロントドアが停止した直後のアウターパネルの変形挙動を評価しているが、それと併せてあるいは代りに音響を採取してその音圧レベルや周波数等を分析評価しても良い。 In the evaluation apparatus of the above embodiment, a rigid floor is used as the rigid member. However, the present invention is not limited to this. For example, a box-shaped cross-section structure or a truss structure rigid frame may be used as the rigid member. good. Furthermore, in the evaluation method of the above embodiment, the deformation behavior of the outer panel immediately after the front door stops is evaluated, but in addition to or instead of that, sound is collected and the sound pressure level, frequency, etc. are analyzed and evaluated. May be.
かくして本発明の自動車用開閉部品の閉まり音評価試験方法および本発明の自動車用開閉部品の閉まり音評価試験装置によれば、車体１台分を試作することなく、自動車用開閉部品単体でアウターパネルを閉じる際の振動・反転挙動およびその時の音を評価することができ、これにより、車体１台分の試作を行わなくても自動車用開閉部品のみの試作で試験が可能であるので、時間、費用とも従来よりも低減することができる。 Thus, according to the closing sound evaluation test method for an automotive opening / closing component of the present invention and the closing sound evaluation test apparatus for an automotive opening / closing component of the present invention, the outer panel of the automotive opening / closing component alone can be manufactured without trial manufacture of one vehicle body. The vibration / reversal behavior and sound at that time can be evaluated, so that it is possible to test with a prototype of only the opening and closing parts for automobiles without having to make a prototype for one car body. Both costs can be reduced as compared with the prior art.
Claims (5)
前記自動車用開閉部品の閉まり音評価試験装置の前記ヒンジを、前記自動車用開閉部品のヒンジ取付部に取り付けた後、前記自動車用開閉部品の前記ロック部側の部分を持ち上げて、前記剛性部材へ向けて落下させ、前記ロック部と前記ラッチ部とを噛み合わせることで、前記自動車用開閉部品が閉まる際の挙動を再現することを特徴とする自動車用開閉部品の閉まり音評価試験方法。 Using an automobile opening / closing component closing sound evaluation test device comprising a hinge that supports the opening / closing component for an automobile and a latch portion that meshes with a lock portion of the opening / closing component for an automobile, on the rigid member,
After attaching the hinge of the automotive opening / closing component closing sound evaluation test apparatus to the hinge mounting portion of the automotive opening / closing component, the portion on the lock portion side of the automotive opening / closing component is lifted to the rigid member A closing sound evaluation test method for an automotive opening / closing component, wherein the behavior when the automotive opening / closing component is closed is reproduced by dropping toward the lock and engaging the lock portion and the latch portion.
前記自動車用開閉部品のロック部に噛み合うラッチ部と、
を具えてなる自動車用開閉部品の閉まり音評価試験装置。 On the upper part of the rigid member, a hinge that supports the opening and closing part for automobiles,
A latch portion that meshes with a lock portion of the automotive opening and closing component;
A test system for evaluating the closing noise of automotive opening and closing parts.
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